src/sysdep.c

   1 /* Interfaces to system-dependent kernel and library entries.
   2    Copyright (C) 1985, 86, 87, 88, 93, 94, 95 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 #include <signal.h>
  23 #include <setjmp.h>
  24
  25 #include <config.h>
  26 #include "lisp.h"
  27 #include "blockinput.h"
  28 #undef NULL
  29
  30 #define min(x,y) ((x) > (y) ? (y) : (x))
  31
  32 /* In this file, open, read and write refer to the system calls,
  33    not our sugared interfaces  sys_open, sys_read and sys_write.
  34    Contrariwise, for systems where we use the system calls directly,
  35    define sys_read, etc. here as aliases for them.  */
  36 #ifndef read
  37 #define sys_read read
  38 #define sys_write write
  39 #endif /* `read' is not a macro */
  40
  41 #undef read
  42 #undef write
  43
  44 #ifdef WINDOWSNT
  45 #define read _read
  46 #define write _write
  47 #include <windows.h>
  48 extern int errno;
  49 #endif /* not WINDOWSNT */
  50
  51 #ifndef close
  52 #define sys_close close
  53 #else
  54 #undef close
  55 #endif
  56
  57 #ifndef open
  58 #define sys_open open
  59 #else /* `open' is a macro */
  60 #undef open
  61 #endif /* `open' is a macro */
  62
  63 /* Does anyone other than VMS need this? */
  64 #ifndef fwrite
  65 #define sys_fwrite fwrite
  66 #else
  67 #undef fwrite
  68 #endif
  69
  70 #ifndef HAVE_H_ERRNO
  71 extern int h_errno;
  72 #endif
  73
  74 #include <stdio.h>
  75 #include <sys/types.h>
  76 #include <sys/stat.h>
  77 #include <errno.h>
  78
  79 /* Get _POSIX_VDISABLE, if it is available.  */
  80 #ifdef HAVE_UNISTD_H
  81 #include <unistd.h>
  82 #endif
  83
  84 /* Get SI_SRPC_DOMAIN, if it is available.  */
  85 #ifdef HAVE_SYS_SYSTEMINFO_H
  86 #include <sys/systeminfo.h>
  87 #endif
  88
  89 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
  90 #include <dos.h>
  91 #include "dosfns.h"
  92 #include "msdos.h"
  93 #include <sys/param.h>
  94
  95 #if __DJGPP__ > 1
  96 extern int etext;
  97 extern unsigned start __asm__ ("start");
  98 #endif
  99 #endif
 100
 101 extern int errno;
 102
 103 #ifdef VMS
 104 #include <rms.h>
 105 #include <ttdef.h>
 106 #include <tt2def.h>
 107 #include <iodef.h>
 108 #include <ssdef.h>
 109 #include <descrip.h>
 110 #include <fibdef.h>
 111 #include <atrdef.h>
 112 #include <ctype.h>
 113 #include <string.h>
 114 #ifdef __GNUC__
 115 #include <sys/file.h>
 116 #else
 117 #include <file.h>
 118 #endif
 119 #undef F_SETFL
 120 #ifndef RAB$C_BID
 121 #include <rab.h>
 122 #endif
 123 #define MAXIOSIZE (32 * PAGESIZE) /* Don't I/O more than 32 blocks at a time */
 124 #endif /* VMS */
 125
 126 #ifndef BSD4_1
 127 #ifdef BSD_SYSTEM /* avoid writing defined (BSD_SYSTEM) || defined (USG)
 128               because the vms compiler doesn't grok `defined' */
 129 #include <fcntl.h>
 130 #endif
 131 #ifdef USG
 132 #ifndef USG5
 133 #include <fcntl.h>
 134 #endif
 135 #endif
 136 #endif /* not 4.1 bsd */
 137
 138 #ifndef MSDOS
 139 #include <sys/ioctl.h>
 140 #endif
 141
 142 #include "systty.h"
 143 #include "syswait.h"
 144
 145 #ifdef BROKEN_TIOCGWINSZ
 146 #undef TIOCGWINSZ
 147 #undef TIOCSWINSZ
 148 #endif
 149
 150 #if defined(USG) || defined(DGUX)
 151 #include <sys/utsname.h>
 152 #include <string.h>
 153 #ifndef MEMORY_IN_STRING_H
 154 #include <memory.h>
 155 #endif
 156 #if defined (TIOCGWINSZ) || defined (ISC4_0)
 157 #ifdef NEED_SIOCTL
 158 #include <sys/sioctl.h>
 159 #endif
 160 #ifdef NEED_PTEM_H
 161 #include <sys/stream.h>
 162 #include <sys/ptem.h>
 163 #endif
 164 #endif /* TIOCGWINSZ or ISC4_0 */
 165 #endif /* USG or DGUX */
 166
 167 extern int quit_char;
 168
 169 #include "frame.h"
 170 #include "window.h"
 171 #include "termhooks.h"
 172 #include "termchar.h"
 173 #include "termopts.h"
 174 #include "dispextern.h"
 175 #include "process.h"
 176
 177 #ifdef WINDOWSNT
 178 #include <direct.h>
 179 /* In process.h which conflicts with the local copy.  */
 180 #define _P_WAIT 0
 181 int _CRTAPI1 _spawnlp (int, const char *, const char *, ...);
 182 int _CRTAPI1 _getpid (void);
 183 #endif
 184
 185 #ifdef NONSYSTEM_DIR_LIBRARY
 186 #include "ndir.h"
 187 #endif /* NONSYSTEM_DIR_LIBRARY */
 188
 189 #include "syssignal.h"
 190 #include "systime.h"
 191 #ifdef HAVE_UTIME_H
 192 #include <utime.h>
 193 #endif
 194
 195 #ifndef HAVE_UTIMES
 196 #ifndef HAVE_STRUCT_UTIMBUF
 197 /* We want to use utime rather than utimes, but we couldn't find the
 198    structure declaration.  We'll use the traditional one.  */
 199 struct utimbuf {
 200   long actime;
 201   long modtime;
 202 };
 203 #endif
 204 #endif
 205
 206 #ifndef VFORK_RETURN_TYPE
 207 #define VFORK_RETURN_TYPE int
 208 #endif
 209
 210 /* LPASS8 is new in 4.3, and makes cbreak mode provide all 8 bits.  */
 211 #ifndef LPASS8
 212 #define LPASS8 0
 213 #endif
 214
 215 #ifdef BSD4_1
 216 #define LNOFLSH 0100000
 217 #endif
 218
 219 static int baud_convert[] =
 220 #ifdef BAUD_CONVERT
 221   BAUD_CONVERT;
 222 #else
 223   {
 224     0, 50, 75, 110, 135, 150, 200, 300, 600, 1200,
 225     1800, 2400, 4800, 9600, 19200, 38400
 226   };
 227 #endif
 228
 229 #if defined (HAVE_LIBNCURSES) && ! defined (NCURSES_OSPEED_T)
 230 extern short ospeed;
 231 #else
 232 #if defined (HAVE_TERMIOS_H) && defined (LINUX)
 233 #include <termios.h>
 234 /* HJL's version of libc is said to need this on the Alpha.
 235    On the other hand, DEC OSF1 on the Alpha needs ospeed to be a short.  */
 236 extern speed_t ospeed;
 237 #else
 238 extern short ospeed;
 239 #endif
 240 #endif
 241
 242 /* The file descriptor for Emacs's input terminal.
 243    Under Unix, this is normally zero except when using X;
 244    under VMS, we place the input channel number here.  */
 245 int input_fd;
 246 \f
 247 /* Specify a different file descriptor for further input operations.  */
 248
 249 void
 250 change_input_fd (fd)
 251      int fd;
 252 {
 253   input_fd = fd;
 254 }
 255
 256 /* Discard pending input on descriptor input_fd.  */
 257
 258 void
 259 discard_tty_input ()
 260 {
 261 #ifndef WINDOWSNT
 262   struct emacs_tty buf;
 263
 264   if (noninteractive)
 265     return;
 266
 267   /* Discarding input is not safe when the input could contain
 268      replies from the X server.  So don't do it.  */
 269   if (read_socket_hook)
 270     return;
 271
 272 #ifdef VMS
 273   end_kbd_input ();
 274   SYS$QIOW (0, input_fd, IO$_READVBLK|IO$M_PURGE, input_iosb, 0, 0,
 275             &buf.main, 0, 0, terminator_mask, 0, 0);
 276   queue_kbd_input ();
 277 #else /* not VMS */
 278 #ifdef APOLLO
 279   {
 280     int zero = 0;
 281     ioctl (input_fd, TIOCFLUSH, &zero);
 282   }
 283 #else /* not Apollo */
 284 #ifdef MSDOS    /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
 285   while (dos_keyread () != -1)
 286     ;
 287 #else /* not MSDOS */
 288   EMACS_GET_TTY (input_fd, &buf);
 289   EMACS_SET_TTY (input_fd, &buf, 0);
 290 #endif /* not MSDOS */
 291 #endif /* not Apollo */
 292 #endif /* not VMS */
 293 #endif /* not WINDOWSNT */
 294 }
 295
 296 #ifdef SIGTSTP
 297
 298 /* Arrange for character C to be read as the next input from
 299    the terminal.  */
 300
 301 stuff_char (c)
 302      char c;
 303 {
 304   if (read_socket_hook)
 305     return;
 306
 307 /* Should perhaps error if in batch mode */
 308 #ifdef TIOCSTI
 309   ioctl (input_fd, TIOCSTI, &c);
 310 #else /* no TIOCSTI */
 311   error ("Cannot stuff terminal input characters in this version of Unix");
 312 #endif /* no TIOCSTI */
 313 }
 314
 315 #endif /* SIGTSTP */
 316 \f
 317 void
 318 init_baud_rate ()
 319 {
 320   if (noninteractive)
 321     ospeed = 0;
 322   else
 323     {
 324 #ifdef INIT_BAUD_RATE
 325       INIT_BAUD_RATE ();
 326 #else
 327 #ifdef DOS_NT
 328     ospeed = 15;
 329 #else  /* not DOS_NT */
 330 #ifdef VMS
 331       struct sensemode sg;
 332
 333       SYS$QIOW (0, input_fd, IO$_SENSEMODE, &sg, 0, 0,
 334                 &sg.class, 12, 0, 0, 0, 0 );
 335       ospeed = sg.xmit_baud;
 336 #else /* not VMS */
 337 #ifdef HAVE_TERMIOS
 338       struct termios sg;
 339
 340       sg.c_cflag = B9600;
 341       tcgetattr (input_fd, &sg);
 342       ospeed = cfgetospeed (&sg);
 343 #if defined (USE_GETOBAUD) && defined (getobaud)
 344       /* m88k-motorola-sysv3 needs this (ghazi@noc.rutgers.edu) 9/1/94. */
 345       if (ospeed == 0)
 346         ospeed = getobaud (sg.c_cflag);
 347 #endif
 348 #else /* neither VMS nor TERMIOS */
 349 #ifdef HAVE_TERMIO
 350       struct termio sg;
 351
 352       sg.c_cflag = B9600;
 353 #ifdef HAVE_TCATTR
 354       tcgetattr (input_fd, &sg);
 355 #else
 356       ioctl (input_fd, TCGETA, &sg);
 357 #endif
 358       ospeed = sg.c_cflag & CBAUD;
 359 #else /* neither VMS nor TERMIOS nor TERMIO */
 360       struct sgttyb sg;
 361
 362       sg.sg_ospeed = B9600;
 363       if (ioctl (input_fd, TIOCGETP, &sg) < 0)
 364         abort ();
 365       ospeed = sg.sg_ospeed;
 366 #endif /* not HAVE_TERMIO */
 367 #endif /* not HAVE_TERMIOS */
 368 #endif /* not VMS */
 369 #endif /* not DOS_NT */
 370 #endif /* not INIT_BAUD_RATE */
 371     }
 372
 373   baud_rate = (ospeed < sizeof baud_convert / sizeof baud_convert[0]
 374                ? baud_convert[ospeed] : 9600);
 375   if (baud_rate == 0)
 376     baud_rate = 1200;
 377 }
 378
 379 /*ARGSUSED*/
 380 set_exclusive_use (fd)
 381      int fd;
 382 {
 383 #ifdef FIOCLEX
 384   ioctl (fd, FIOCLEX, 0);
 385 #endif
 386   /* Ok to do nothing if this feature does not exist */
 387 }
 388 \f
 389 #ifndef subprocesses
 390
 391 wait_without_blocking ()
 392 {
 393 #ifdef BSD_SYSTEM
 394   wait3 (0, WNOHANG | WUNTRACED, 0);
 395 #else
 396   croak ("wait_without_blocking");
 397 #endif
 398   synch_process_alive = 0;
 399 }
 400
 401 #endif /* not subprocesses */
 402
 403 int wait_debugging;   /* Set nonzero to make following function work under dbx
 404                          (at least for bsd).  */
 405
 406 SIGTYPE
 407 wait_for_termination_signal ()
 408 {}
 409
 410 /* Wait for subprocess with process id `pid' to terminate and
 411    make sure it will get eliminated (not remain forever as a zombie) */
 412
 413 void
 414 wait_for_termination (pid)
 415      int pid;
 416 {
 417   while (1)
 418     {
 419 #ifdef subprocesses
 420 #ifdef VMS
 421       int status;
 422
 423       status = SYS$FORCEX (&pid, 0, 0);
 424       break;
 425 #else /* not VMS */
 426 #if defined (BSD_SYSTEM) || (defined (HPUX) && !defined (HPUX_5))
 427       /* Note that kill returns -1 even if the process is just a zombie now.
 428          But inevitably a SIGCHLD interrupt should be generated
 429          and child_sig will do wait3 and make the process go away. */
 430       /* There is some indication that there is a bug involved with
 431          termination of subprocesses, perhaps involving a kernel bug too,
 432          but no idea what it is.  Just as a hunch we signal SIGCHLD to see
 433          if that causes the problem to go away or get worse.  */
 434       sigsetmask (sigmask (SIGCHLD));
 435       if (0 > kill (pid, 0))
 436         {
 437           sigsetmask (SIGEMPTYMASK);
 438           kill (getpid (), SIGCHLD);
 439           break;
 440         }
 441       if (wait_debugging)
 442         sleep (1);
 443       else
 444         sigpause (SIGEMPTYMASK);
 445 #else /* not BSD_SYSTEM, and not HPUX version >= 6 */
 446 #if defined (UNIPLUS)
 447       if (0 > kill (pid, 0))
 448         break;
 449       wait (0);
 450 #else /* neither BSD_SYSTEM nor UNIPLUS: random sysV */
 451 #ifdef POSIX_SIGNALS    /* would this work for LINUX as well? */
 452       sigblock (sigmask (SIGCHLD));
 453       if (0 > kill (pid, 0))
 454         {
 455           sigunblock (sigmask (SIGCHLD));
 456           break;
 457         }
 458       sigpause (SIGEMPTYMASK);
 459 #else /* not POSIX_SIGNALS */
 460 #ifdef HAVE_SYSV_SIGPAUSE
 461       sighold (SIGCHLD);
 462       if (0 > kill (pid, 0))
 463         {
 464           sigrelse (SIGCHLD);
 465           break;
 466         }
 467       sigpause (SIGCHLD);
 468 #else /* not HAVE_SYSV_SIGPAUSE */
 469 #ifdef WINDOWSNT
 470       wait (0);
 471       break;
 472 #else /* not WINDOWSNT */
 473       if (0 > kill (pid, 0))
 474         break;
 475       /* Using sleep instead of pause avoids timing error.
 476          If the inferior dies just before the sleep,
 477          we lose just one second.  */
 478       sleep (1);
 479 #endif /* not WINDOWSNT */
 480 #endif /* not HAVE_SYSV_SIGPAUSE */
 481 #endif /* not POSIX_SIGNALS */
 482 #endif /* not UNIPLUS */
 483 #endif /* not BSD_SYSTEM, and not HPUX version >= 6 */
 484 #endif /* not VMS */
 485 #else /* not subprocesses */
 486 #if __DJGPP__ > 1
 487       break;
 488 #else /* not __DJGPP__ > 1 */
 489 #ifndef BSD4_1
 490       if (kill (pid, 0) < 0)
 491         break;
 492       wait (0);
 493 #else /* BSD4_1 */
 494       int status;
 495       status = wait (0);
 496       if (status == pid || status == -1)
 497         break;
 498 #endif /* BSD4_1 */
 499 #endif /* not __DJGPP__ > 1*/
 500 #endif /* not subprocesses */
 501     }
 502 }
 503
 504 #ifdef subprocesses
 505
 506 /*
 507  *      flush any pending output
 508  *      (may flush input as well; it does not matter the way we use it)
 509  */
 510
 511 void
 512 flush_pending_output (channel)
 513      int channel;
 514 {
 515 #ifdef HAVE_TERMIOS
 516   /* If we try this, we get hit with SIGTTIN, because
 517      the child's tty belongs to the child's pgrp. */
 518 #else
 519 #ifdef TCFLSH
 520   ioctl (channel, TCFLSH, 1);
 521 #else
 522 #ifdef TIOCFLUSH
 523   int zero = 0;
 524   /* 3rd arg should be ignored
 525      but some 4.2 kernels actually want the address of an int
 526      and nonzero means something different.  */
 527   ioctl (channel, TIOCFLUSH, &zero);
 528 #endif
 529 #endif
 530 #endif
 531 }
 532 \f
 533 #ifndef VMS
 534 /*  Set up the terminal at the other end of a pseudo-terminal that
 535     we will be controlling an inferior through.
 536     It should not echo or do line-editing, since that is done
 537     in Emacs.  No padding needed for insertion into an Emacs buffer.  */
 538
 539 void
 540 child_setup_tty (out)
 541      int out;
 542 {
 543 #ifndef DOS_NT
 544   struct emacs_tty s;
 545
 546   EMACS_GET_TTY (out, &s);
 547
 548 #if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
 549   s.main.c_oflag |= OPOST;      /* Enable output postprocessing */
 550   s.main.c_oflag &= ~ONLCR;     /* Disable map of NL to CR-NL on output */
 551 #ifdef NLDLY
 552   s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
 553                                 /* No output delays */
 554 #endif
 555   s.main.c_lflag &= ~ECHO;      /* Disable echo */
 556   s.main.c_lflag |= ISIG;       /* Enable signals */
 557 #ifdef IUCLC
 558   s.main.c_iflag &= ~IUCLC;     /* Disable downcasing on input.  */
 559 #endif
 560 #ifdef ISTRIP
 561   s.main.c_iflag &= ~ISTRIP;    /* don't strip 8th bit on input */
 562 #endif
 563 #ifdef OLCUC
 564   s.main.c_oflag &= ~OLCUC;     /* Disable upcasing on output.  */
 565 #endif
 566   s.main.c_oflag &= ~TAB3;      /* Disable tab expansion */
 567   s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
 568 #if 0
 569   /* Said to be unnecessary:  */
 570   s.main.c_cc[VMIN] = 1;        /* minimum number of characters to accept  */
 571   s.main.c_cc[VTIME] = 0;       /* wait forever for at least 1 character  */
 572 #endif
 573
 574   s.main.c_lflag |= ICANON;     /* Enable erase/kill and eof processing */
 575   s.main.c_cc[VEOF] = 04;       /* insure that EOF is Control-D */
 576   s.main.c_cc[VERASE] = CDISABLE;       /* disable erase processing */
 577   s.main.c_cc[VKILL] = CDISABLE;        /* disable kill processing */
 578
 579 #ifdef HPUX
 580   s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
 581 #endif /* HPUX */
 582
 583 #ifdef AIX
 584 /* AIX enhanced edit loses NULs, so disable it */
 585 #ifndef IBMR2AIX
 586   s.main.c_line = 0;
 587   s.main.c_iflag &= ~ASCEDIT;
 588 #endif
 589   /* Also, PTY overloads NUL and BREAK.
 590      don't ignore break, but don't signal either, so it looks like NUL.  */
 591   s.main.c_iflag &= ~IGNBRK;
 592   s.main.c_iflag &= ~BRKINT;
 593   /* QUIT and INTR work better as signals, so disable character forms */
 594   s.main.c_cc[VINTR] = 0377;
 595 #ifdef SIGNALS_VIA_CHARACTERS
 596   /* the QUIT and INTR character are used in process_send_signal
 597      so set them here to something useful.  */
 598   if (s.main.c_cc[VQUIT] == 0377)
 599     s.main.c_cc[VQUIT] = '\\'&037;      /* Control-\ */
 600   if (s.main.c_cc[VINTR] == 0377)
 601     s.main.c_cc[VINTR] = 'C'&037;       /* Control-C */
 602 #else /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
 603   /* QUIT and INTR work better as signals, so disable character forms */
 604   s.main.c_cc[VQUIT] = 0377;
 605   s.main.c_cc[VINTR] = 0377;
 606   s.main.c_lflag &= ~ISIG;
 607 #endif /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
 608   s.main.c_cc[VEOL] = 0377;
 609   s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
 610 #endif /* AIX */
 611
 612 #else /* not HAVE_TERMIO */
 613
 614   s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
 615                        | CBREAK | TANDEM);
 616   s.main.sg_flags |= LPASS8;
 617   s.main.sg_erase = 0377;
 618   s.main.sg_kill = 0377;
 619   s.lmode = LLITOUT | s.lmode;        /* Don't strip 8th bit */
 620
 621 #endif /* not HAVE_TERMIO */
 622
 623   EMACS_SET_TTY (out, &s, 0);
 624
 625 #ifdef BSD4_1
 626   if (interrupt_input)
 627     reset_sigio ();
 628 #endif /* BSD4_1 */
 629 #ifdef RTU
 630   {
 631     int zero = 0;
 632     ioctl (out, FIOASYNC, &zero);
 633   }
 634 #endif /* RTU */
 635 #endif /* not DOS_NT */
 636 }
 637 #endif /* not VMS */
 638
 639 #endif /* subprocesses */
 640 \f
 641 /* Record a signal code and the handler for it.  */
 642 struct save_signal
 643 {
 644   int code;
 645   SIGTYPE (*handler) P_ ((int));
 646 };
 647
 648 static void save_signal_handlers P_ ((struct save_signal *));
 649 static void restore_signal_handlers P_ ((struct save_signal *));
 650
 651 /* Suspend the Emacs process; give terminal to its superior.  */
 652
 653 void
 654 sys_suspend ()
 655 {
 656 #ifdef VMS
 657   /* "Foster" parentage allows emacs to return to a subprocess that attached
 658      to the current emacs as a cheaper than starting a whole new process.  This
 659      is set up by KEPTEDITOR.COM.  */
 660   unsigned long parent_id, foster_parent_id;
 661   char *fpid_string;
 662
 663   fpid_string = getenv ("EMACS_PARENT_PID");
 664   if (fpid_string != NULL)
 665     {
 666       sscanf (fpid_string, "%x", &foster_parent_id);
 667       if (foster_parent_id != 0)
 668         parent_id = foster_parent_id;
 669       else
 670         parent_id = getppid ();
 671     }
 672   else
 673     parent_id = getppid ();
 674
 675   xfree (fpid_string);          /* On VMS, this was malloc'd */
 676
 677   if (parent_id && parent_id != 0xffffffff)
 678     {
 679       SIGTYPE (*oldsig)() = (int) signal (SIGINT, SIG_IGN);
 680       int status = LIB$ATTACH (&parent_id) & 1;
 681       signal (SIGINT, oldsig);
 682       return status;
 683     }
 684   else
 685     {
 686       struct {
 687         int     l;
 688         char    *a;
 689       } d_prompt;
 690       d_prompt.l = sizeof ("Emacs: ");          /* Our special prompt */
 691       d_prompt.a = "Emacs: ";                   /* Just a reminder */
 692       LIB$SPAWN (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &d_prompt, 0);
 693       return 1;
 694     }
 695   return -1;
 696 #else
 697 #if defined(SIGTSTP) && !defined(MSDOS)
 698
 699   {
 700     int pgrp = EMACS_GETPGRP (0);
 701     EMACS_KILLPG (pgrp, SIGTSTP);
 702   }
 703
 704 #else /* No SIGTSTP */
 705 #ifdef USG_JOBCTRL /* If you don't know what this is don't mess with it */
 706   ptrace (0, 0, 0, 0);          /* set for ptrace - caught by csh */
 707   kill (getpid (), SIGQUIT);
 708
 709 #else /* No SIGTSTP or USG_JOBCTRL */
 710
 711 /* On a system where suspending is not implemented,
 712    instead fork a subshell and let it talk directly to the terminal
 713    while we wait.  */
 714   sys_subshell ();
 715
 716 #endif /* no USG_JOBCTRL */
 717 #endif /* no SIGTSTP */
 718 #endif /* not VMS */
 719 }
 720
 721 /* Fork a subshell.  */
 722
 723 void
 724 sys_subshell ()
 725 {
 726 #ifndef VMS
 727 #ifdef DOS_NT   /* Demacs 1.1.2 91/10/20 Manabu Higashida */
 728   int st;
 729   char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS.  */
 730 #endif
 731   int pid;
 732   struct save_signal saved_handlers[5];
 733   Lisp_Object dir;
 734   unsigned char *str = 0;
 735   int len;
 736
 737   saved_handlers[0].code = SIGINT;
 738   saved_handlers[1].code = SIGQUIT;
 739   saved_handlers[2].code = SIGTERM;
 740 #ifdef SIGIO
 741   saved_handlers[3].code = SIGIO;
 742   saved_handlers[4].code = 0;
 743 #else
 744   saved_handlers[3].code = 0;
 745 #endif
 746
 747   /* Mentioning current_buffer->buffer would mean including buffer.h,
 748      which somehow wedges the hp compiler.  So instead...  */
 749
 750   dir = intern ("default-directory");
 751   if (NILP (Fboundp (dir)))
 752     goto xyzzy;
 753   dir = Fsymbol_value (dir);
 754   if (!STRINGP (dir))
 755     goto xyzzy;
 756
 757   dir = expand_and_dir_to_file (Funhandled_file_name_directory (dir), Qnil);
 758   str = (unsigned char *) alloca (XSTRING (dir)->size + 2);
 759   len = XSTRING (dir)->size;
 760   bcopy (XSTRING (dir)->data, str, len);
 761   if (str[len - 1] != '/') str[len++] = '/';
 762   str[len] = 0;
 763  xyzzy:
 764
 765 #ifdef DOS_NT
 766   pid = 0;
 767 #if __DJGPP__ > 1
 768   save_signal_handlers (saved_handlers);
 769   synch_process_alive = 1;
 770 #endif /* __DJGPP__ > 1 */
 771 #else
 772   pid = vfork ();
 773   if (pid == -1)
 774     error ("Can't spawn subshell");
 775 #endif
 776
 777   if (pid == 0)
 778     {
 779       char *sh = 0;
 780
 781 #ifdef DOS_NT    /* MW, Aug 1993 */
 782       getwd (oldwd);
 783       if (sh == 0)
 784         sh = (char *) egetenv ("SUSPEND");      /* KFS, 1994-12-14 */
 785 #endif
 786       if (sh == 0)
 787         sh = (char *) egetenv ("SHELL");
 788       if (sh == 0)
 789         sh = "sh";
 790
 791       /* Use our buffer's default directory for the subshell.  */
 792       if (str)
 793         chdir (str);
 794
 795 #ifdef subprocesses
 796       close_process_descs ();   /* Close Emacs's pipes/ptys */
 797 #endif
 798
 799 #ifdef SET_EMACS_PRIORITY
 800       {
 801         extern int emacs_priority;
 802
 803         if (emacs_priority < 0)
 804           nice (-emacs_priority);
 805       }
 806 #endif
 807
 808 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
 809       st = system (sh);
 810       chdir (oldwd);
 811 #if 0   /* This is also reported if last command executed in subshell failed, KFS */
 812       if (st)
 813         report_file_error ("Can't execute subshell", Fcons (build_string (sh), Qnil));
 814 #endif
 815 #else /* not MSDOS */
 816 #ifdef  WINDOWSNT
 817       /* Waits for process completion */
 818       pid = _spawnlp (_P_WAIT, sh, sh, NULL);
 819       chdir (oldwd);
 820       if (pid == -1)
 821         write (1, "Can't execute subshell", 22);
 822 #else   /* not WINDOWSNT */
 823       execlp (sh, sh, 0);
 824       write (1, "Can't execute subshell", 22);
 825       _exit (1);
 826 #endif  /* not WINDOWSNT */
 827 #endif /* not MSDOS */
 828     }
 829
 830   /* Do this now if we did not do it before.  */
 831 #if !defined (MSDOS) || __DJGPP__ == 1
 832   save_signal_handlers (saved_handlers);
 833   synch_process_alive = 1;
 834 #endif
 835
 836 #ifndef DOS_NT
 837   wait_for_termination (pid);
 838 #endif
 839   restore_signal_handlers (saved_handlers);
 840   synch_process_alive = 0;
 841 #endif /* !VMS */
 842 }
 843
 844 static void
 845 save_signal_handlers (saved_handlers)
 846      struct save_signal *saved_handlers;
 847 {
 848   while (saved_handlers->code)
 849     {
 850       saved_handlers->handler
 851         = (SIGTYPE (*) P_ ((int))) signal (saved_handlers->code, SIG_IGN);
 852       saved_handlers++;
 853     }
 854 }
 855
 856 static void
 857 restore_signal_handlers (saved_handlers)
 858      struct save_signal *saved_handlers;
 859 {
 860   while (saved_handlers->code)
 861     {
 862       signal (saved_handlers->code, saved_handlers->handler);
 863       saved_handlers++;
 864     }
 865 }
 866 \f
 867 #ifdef F_SETFL
 868
 869 int old_fcntl_flags;
 870
 871 void
 872 init_sigio (fd)
 873      int fd;
 874 {
 875 #ifdef FASYNC
 876   old_fcntl_flags = fcntl (fd, F_GETFL, 0) & ~FASYNC;
 877   fcntl (fd, F_SETFL, old_fcntl_flags | FASYNC);
 878 #endif
 879   interrupts_deferred = 0;
 880 }
 881
 882 void
 883 reset_sigio ()
 884 {
 885   unrequest_sigio ();
 886 }
 887
 888 #ifdef FASYNC           /* F_SETFL does not imply existence of FASYNC */
 889
 890 void
 891 request_sigio ()
 892 {
 893   if (read_socket_hook)
 894     return;
 895
 896 #ifdef SIGWINCH
 897   sigunblock (sigmask (SIGWINCH));
 898 #endif
 899   fcntl (input_fd, F_SETFL, old_fcntl_flags | FASYNC);
 900
 901   interrupts_deferred = 0;
 902 }
 903
 904 void
 905 unrequest_sigio ()
 906 {
 907   if (read_socket_hook)
 908     return;
 909
 910 #ifdef SIGWINCH
 911   sigblock (sigmask (SIGWINCH));
 912 #endif
 913   fcntl (input_fd, F_SETFL, old_fcntl_flags);
 914   interrupts_deferred = 1;
 915 }
 916
 917 #else /* no FASYNC */
 918 #ifdef STRIDE           /* Stride doesn't have FASYNC - use FIOASYNC */
 919
 920 void
 921 request_sigio ()
 922 {
 923   int on = 1;
 924
 925   if (read_socket_hook)
 926     return;
 927
 928   ioctl (input_fd, FIOASYNC, &on);
 929   interrupts_deferred = 0;
 930 }
 931
 932 void
 933 unrequest_sigio ()
 934 {
 935   int off = 0;
 936
 937   if (read_socket_hook)
 938     return;
 939
 940   ioctl (input_fd, FIOASYNC, &off);
 941   interrupts_deferred = 1;
 942 }
 943
 944 #else /* not FASYNC, not STRIDE */
 945
 946 #ifdef _CX_UX
 947
 948 #include <termios.h>
 949
 950 void
 951 request_sigio ()
 952 {
 953   int on = 1;
 954   sigset_t st;
 955
 956   if (read_socket_hook)
 957     return;
 958
 959   sigemptyset(&st);
 960   sigaddset(&st, SIGIO);
 961   ioctl (input_fd, FIOASYNC, &on);
 962   interrupts_deferred = 0;
 963   sigprocmask(SIG_UNBLOCK, &st, (sigset_t *)0);
 964 }
 965
 966 void
 967 unrequest_sigio ()
 968 {
 969   int off = 0;
 970
 971   if (read_socket_hook)
 972     return;
 973
 974   ioctl (input_fd, FIOASYNC, &off);
 975   interrupts_deferred = 1;
 976 }
 977
 978 #else /* ! _CX_UX */
 979
 980 void
 981 request_sigio ()
 982 {
 983   if (read_socket_hook)
 984     return;
 985
 986   croak ("request_sigio");
 987 }
 988
 989 void
 990 unrequest_sigio ()
 991 {
 992   if (read_socket_hook)
 993     return;
 994
 995   croak ("unrequest_sigio");
 996 }
 997
 998 #endif /* _CX_UX */
 999 #endif /* STRIDE */
1000 #endif /* FASYNC */
1001 #endif /* F_SETFL */
1002 \f
1003 /* Saving and restoring the process group of Emacs's terminal.  */
1004
1005 #ifdef BSD_PGRPS
1006
1007 /* The process group of which Emacs was a member when it initially
1008    started.
1009
1010    If Emacs was in its own process group (i.e. inherited_pgroup ==
1011    getpid ()), then we know we're running under a shell with job
1012    control (Emacs would never be run as part of a pipeline).
1013    Everything is fine.
1014
1015    If Emacs was not in its own process group, then we know we're
1016    running under a shell (or a caller) that doesn't know how to
1017    separate itself from Emacs (like sh).  Emacs must be in its own
1018    process group in order to receive SIGIO correctly.  In this
1019    situation, we put ourselves in our own pgroup, forcibly set the
1020    tty's pgroup to our pgroup, and make sure to restore and reinstate
1021    the tty's pgroup just like any other terminal setting.  If
1022    inherited_group was not the tty's pgroup, then we'll get a
1023    SIGTTmumble when we try to change the tty's pgroup, and a CONT if
1024    it goes foreground in the future, which is what should happen.  */
1025 int inherited_pgroup;
1026
1027 /* Split off the foreground process group to Emacs alone.
1028    When we are in the foreground, but not started in our own process
1029    group, redirect the TTY to point to our own process group.  We need
1030    to be in our own process group to receive SIGIO properly.  */
1031 narrow_foreground_group ()
1032 {
1033   int me = getpid ();
1034
1035   setpgrp (0, inherited_pgroup);
1036   if (inherited_pgroup != me)
1037     EMACS_SET_TTY_PGRP (input_fd, &me);
1038   setpgrp (0, me);
1039 }
1040
1041 /* Set the tty to our original foreground group.  */
1042 widen_foreground_group ()
1043 {
1044   if (inherited_pgroup != getpid ())
1045     EMACS_SET_TTY_PGRP (input_fd, &inherited_pgroup);
1046   setpgrp (0, inherited_pgroup);
1047 }
1048
1049 #endif /* BSD_PGRPS */
1050 \f
1051 /* Getting and setting emacs_tty structures.  */
1052
1053 /* Set *TC to the parameters associated with the terminal FD.
1054    Return zero if all's well, or -1 if we ran into an error we
1055    couldn't deal with.  */
1056 int
1057 emacs_get_tty (fd, settings)
1058      int fd;
1059      struct emacs_tty *settings;
1060 {
1061   /* Retrieve the primary parameters - baud rate, character size, etcetera.  */
1062 #ifdef HAVE_TCATTR
1063   /* We have those nifty POSIX tcmumbleattr functions.  */
1064   if (tcgetattr (fd, &settings->main) < 0)
1065     return -1;
1066
1067 #else
1068 #ifdef HAVE_TERMIO
1069   /* The SYSV-style interface?  */
1070   if (ioctl (fd, TCGETA, &settings->main) < 0)
1071     return -1;
1072
1073 #else
1074 #ifdef VMS
1075   /* Vehemently Monstrous System?  :-)  */
1076   if (! (SYS$QIOW (0, fd, IO$_SENSEMODE, settings, 0, 0,
1077                    &settings->main.class, 12, 0, 0, 0, 0)
1078          & 1))
1079     return -1;
1080
1081 #else
1082 #ifndef DOS_NT
1083   /* I give up - I hope you have the BSD ioctls.  */
1084   if (ioctl (fd, TIOCGETP, &settings->main) < 0)
1085     return -1;
1086 #endif /* not DOS_NT */
1087 #endif
1088 #endif
1089 #endif
1090
1091   /* Suivant - Do we have to get struct ltchars data?  */
1092 #ifdef HAVE_LTCHARS
1093   if (ioctl (fd, TIOCGLTC, &settings->ltchars) < 0)
1094     return -1;
1095 #endif
1096
1097   /* How about a struct tchars and a wordful of lmode bits?  */
1098 #ifdef HAVE_TCHARS
1099   if (ioctl (fd, TIOCGETC, &settings->tchars) < 0
1100       || ioctl (fd, TIOCLGET, &settings->lmode) < 0)
1101     return -1;
1102 #endif
1103
1104   /* We have survived the tempest.  */
1105   return 0;
1106 }
1107
1108
1109 /* Set the parameters of the tty on FD according to the contents of
1110    *SETTINGS.  If FLUSHP is non-zero, we discard input.
1111    Return 0 if all went well, and -1 if anything failed.  */
1112
1113 int
1114 emacs_set_tty (fd, settings, flushp)
1115      int fd;
1116      struct emacs_tty *settings;
1117      int flushp;
1118 {
1119   /* Set the primary parameters - baud rate, character size, etcetera.  */
1120 #ifdef HAVE_TCATTR
1121   int i;
1122   /* We have those nifty POSIX tcmumbleattr functions.
1123      William J. Smith <wjs@wiis.wang.com> writes:
1124      "POSIX 1003.1 defines tcsetattr() to return success if it was
1125      able to perform any of the requested actions, even if some
1126      of the requested actions could not be performed.
1127      We must read settings back to ensure tty setup properly.
1128      AIX requires this to keep tty from hanging occasionally."  */
1129   /* This make sure that we don't loop indefinitely in here.  */
1130   for (i = 0 ; i < 10 ; i++)
1131     if (tcsetattr (fd, flushp ? TCSAFLUSH : TCSADRAIN, &settings->main) < 0)
1132       {
1133         if (errno == EINTR)
1134           continue;
1135         else
1136           return -1;
1137       }
1138     else
1139       {
1140         struct termios new;
1141
1142         /* Get the current settings, and see if they're what we asked for.  */
1143         tcgetattr (fd, &new);
1144         /* We cannot use memcmp on the whole structure here because under
1145          * aix386 the termios structure has some reserved field that may
1146          * not be filled in.
1147          */
1148         if (   new.c_iflag == settings->main.c_iflag
1149             && new.c_oflag == settings->main.c_oflag
1150             && new.c_cflag == settings->main.c_cflag
1151             && new.c_lflag == settings->main.c_lflag
1152             && memcmp(new.c_cc, settings->main.c_cc, NCCS) == 0)
1153           break;
1154         else
1155           continue;
1156       }
1157
1158 #else
1159 #ifdef HAVE_TERMIO
1160   /* The SYSV-style interface?  */
1161   if (ioctl (fd, flushp ? TCSETAF : TCSETAW, &settings->main) < 0)
1162     return -1;
1163
1164 #else
1165 #ifdef VMS
1166   /* Vehemently Monstrous System?  :-)  */
1167   if (! (SYS$QIOW (0, fd, IO$_SETMODE, &input_iosb, 0, 0,
1168                    &settings->main.class, 12, 0, 0, 0, 0)
1169          & 1))
1170     return -1;
1171
1172 #else
1173 #ifndef DOS_NT
1174   /* I give up - I hope you have the BSD ioctls.  */
1175   if (ioctl (fd, (flushp) ? TIOCSETP : TIOCSETN, &settings->main) < 0)
1176     return -1;
1177 #endif /* not DOS_NT */
1178
1179 #endif
1180 #endif
1181 #endif
1182
1183   /* Suivant - Do we have to get struct ltchars data?  */
1184 #ifdef HAVE_LTCHARS
1185   if (ioctl (fd, TIOCSLTC, &settings->ltchars) < 0)
1186     return -1;
1187 #endif
1188
1189   /* How about a struct tchars and a wordful of lmode bits?  */
1190 #ifdef HAVE_TCHARS
1191   if (ioctl (fd, TIOCSETC, &settings->tchars) < 0
1192       || ioctl (fd, TIOCLSET, &settings->lmode) < 0)
1193     return -1;
1194 #endif
1195
1196   /* We have survived the tempest.  */
1197   return 0;
1198 }
1199
1200 \f
1201 /* The initial tty mode bits */
1202 struct emacs_tty old_tty;
1203
1204 /* 1 if we have been through init_sys_modes.  */
1205 int term_initted;
1206
1207 /* 1 if outer tty status has been recorded.  */
1208 int old_tty_valid;
1209
1210 #ifdef BSD4_1
1211 /* BSD 4.1 needs to keep track of the lmode bits in order to start
1212    sigio.  */
1213 int lmode;
1214 #endif
1215
1216 #ifndef F_SETOWN_BUG
1217 #ifdef F_SETOWN
1218 int old_fcntl_owner;
1219 #endif /* F_SETOWN */
1220 #endif /* F_SETOWN_BUG */
1221
1222 /* This may also be defined in stdio,
1223    but if so, this does no harm,
1224    and using the same name avoids wasting the other one's space.  */
1225
1226 #if defined (USG) || defined (DGUX)
1227 unsigned char _sobuf[BUFSIZ+8];
1228 #else
1229 char _sobuf[BUFSIZ];
1230 #endif
1231
1232 #ifdef HAVE_LTCHARS
1233 static struct ltchars new_ltchars = {-1,-1,-1,-1,-1,-1};
1234 #endif
1235 #ifdef HAVE_TCHARS
1236 static struct tchars new_tchars = {-1,-1,-1,-1,-1,-1};
1237 #endif
1238
1239 void
1240 init_sys_modes ()
1241 {
1242   struct emacs_tty tty;
1243
1244 #ifdef VMS
1245 #if 0
1246   static int oob_chars[2] = {0, 1 << 7}; /* catch C-g's */
1247   extern int (*interrupt_signal) ();
1248 #endif
1249 #endif
1250
1251   Vtty_erase_char = Qnil;
1252
1253   if (noninteractive)
1254     return;
1255
1256 #ifdef VMS
1257   if (!input_ef)
1258     input_ef = get_kbd_event_flag ();
1259     /* LIB$GET_EF (&input_ef); */
1260   SYS$CLREF (input_ef);
1261   waiting_for_ast = 0;
1262   if (!timer_ef)
1263     timer_ef = get_timer_event_flag ();
1264     /* LIB$GET_EF (&timer_ef); */
1265   SYS$CLREF (timer_ef);
1266 #if 0
1267   if (!process_ef)
1268     {
1269       LIB$GET_EF (&process_ef);
1270       SYS$CLREF (process_ef);
1271     }
1272   if (input_ef / 32 != process_ef / 32)
1273     croak ("Input and process event flags in different clusters.");
1274 #endif
1275   if (input_ef / 32 != timer_ef / 32)
1276     croak ("Input and timer event flags in different clusters.");
1277 #if 0
1278   input_eflist = ((unsigned) 1 << (input_ef % 32)) |
1279     ((unsigned) 1 << (process_ef % 32));
1280 #endif
1281   timer_eflist = ((unsigned) 1 << (input_ef % 32)) |
1282     ((unsigned) 1 << (timer_ef % 32));
1283 #ifndef VMS4_4
1284   sys_access_reinit ();
1285 #endif
1286 #endif /* not VMS */
1287
1288 #ifdef BSD_PGRPS
1289   if (! read_socket_hook && EQ (Vwindow_system, Qnil))
1290     narrow_foreground_group ();
1291 #endif
1292
1293 #ifdef HAVE_WINDOW_SYSTEM
1294   /* Emacs' window system on MSDOG uses the `internal terminal' and therefore
1295      needs the initialization code below.  */
1296   if (!read_socket_hook && EQ (Vwindow_system, Qnil))
1297 #endif
1298     {
1299       EMACS_GET_TTY (input_fd, &old_tty);
1300
1301       old_tty_valid = 1;
1302
1303       tty = old_tty;
1304
1305 #if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
1306       XSETINT (Vtty_erase_char, old_tty.main.c_cc[VERASE]);
1307
1308 #ifdef DGUX
1309       /* This allows meta to be sent on 8th bit.  */
1310       tty.main.c_iflag &= ~INPCK;       /* don't check input for parity */
1311 #endif
1312       tty.main.c_iflag |= (IGNBRK);     /* Ignore break condition */
1313       tty.main.c_iflag &= ~ICRNL;       /* Disable map of CR to NL on input */
1314 #ifdef INLCR  /* I'm just being cautious,
1315                  since I can't check how widespread INLCR is--rms.  */
1316       tty.main.c_iflag &= ~INLCR;       /* Disable map of NL to CR on input */
1317 #endif
1318 #ifdef ISTRIP
1319       tty.main.c_iflag &= ~ISTRIP;      /* don't strip 8th bit on input */
1320 #endif
1321       tty.main.c_lflag &= ~ECHO;        /* Disable echo */
1322       tty.main.c_lflag &= ~ICANON;      /* Disable erase/kill processing */
1323 #ifdef IEXTEN
1324       tty.main.c_lflag &= ~IEXTEN;      /* Disable other editing characters.  */
1325 #endif
1326       tty.main.c_lflag |= ISIG; /* Enable signals */
1327       if (flow_control)
1328         {
1329           tty.main.c_iflag |= IXON;     /* Enable start/stop output control */
1330 #ifdef IXANY
1331           tty.main.c_iflag &= ~IXANY;
1332 #endif /* IXANY */
1333         }
1334       else
1335         tty.main.c_iflag &= ~IXON;      /* Disable start/stop output control */
1336       tty.main.c_oflag &= ~ONLCR;       /* Disable map of NL to CR-NL
1337                                            on output */
1338       tty.main.c_oflag &= ~TAB3;        /* Disable tab expansion */
1339 #ifdef CS8
1340       if (meta_key)
1341         {
1342           tty.main.c_cflag |= CS8;      /* allow 8th bit on input */
1343           tty.main.c_cflag &= ~PARENB;/* Don't check parity */
1344         }
1345 #endif
1346       tty.main.c_cc[VINTR] = quit_char; /* C-g (usually) gives SIGINT */
1347       /* Set up C-g for both SIGQUIT and SIGINT.
1348          We don't know which we will get, but we handle both alike
1349          so which one it really gives us does not matter.  */
1350       tty.main.c_cc[VQUIT] = quit_char;
1351       tty.main.c_cc[VMIN] = 1;  /* Input should wait for at least 1 char */
1352       tty.main.c_cc[VTIME] = 0; /* no matter how long that takes.  */
1353 #ifdef VSWTCH
1354       tty.main.c_cc[VSWTCH] = CDISABLE; /* Turn off shell layering use
1355                                            of C-z */
1356 #endif /* VSWTCH */
1357
1358 #if defined (mips) || defined (HAVE_TCATTR)
1359 #ifdef VSUSP
1360       tty.main.c_cc[VSUSP] = CDISABLE;  /* Turn off mips handling of C-z.  */
1361 #endif /* VSUSP */
1362 #ifdef V_DSUSP
1363       tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off mips handling of C-y.  */
1364 #endif /* V_DSUSP */
1365 #ifdef VDSUSP /* Some systems have VDSUSP, some have V_DSUSP.  */
1366       tty.main.c_cc[VDSUSP] = CDISABLE;
1367 #endif /* VDSUSP */
1368 #ifdef VLNEXT
1369       tty.main.c_cc[VLNEXT] = CDISABLE;
1370 #endif /* VLNEXT */
1371 #ifdef VREPRINT
1372       tty.main.c_cc[VREPRINT] = CDISABLE;
1373 #endif /* VREPRINT */
1374 #ifdef VWERASE
1375       tty.main.c_cc[VWERASE] = CDISABLE;
1376 #endif /* VWERASE */
1377 #ifdef VDISCARD
1378       tty.main.c_cc[VDISCARD] = CDISABLE;
1379 #endif /* VDISCARD */
1380
1381       if (flow_control)
1382         {
1383 #ifdef VSTART
1384           tty.main.c_cc[VSTART] = '\021';
1385 #endif /* VSTART */
1386 #ifdef VSTOP
1387           tty.main.c_cc[VSTOP] = '\023';
1388 #endif /* VSTOP */
1389         }
1390       else
1391         {
1392 #ifdef VSTART
1393           tty.main.c_cc[VSTART] = CDISABLE;
1394 #endif /* VSTART */
1395 #ifdef VSTOP
1396           tty.main.c_cc[VSTOP] = CDISABLE;
1397 #endif /* VSTOP */
1398         }
1399 #endif /* mips or HAVE_TCATTR */
1400
1401 #ifdef SET_LINE_DISCIPLINE
1402       /* Need to explicitly request TERMIODISC line discipline or
1403          Ultrix's termios does not work correctly.  */
1404       tty.main.c_line = SET_LINE_DISCIPLINE;
1405 #endif
1406 #ifdef AIX
1407 #ifndef IBMR2AIX
1408       /* AIX enhanced edit loses NULs, so disable it.  */
1409       tty.main.c_line = 0;
1410       tty.main.c_iflag &= ~ASCEDIT;
1411 #else
1412       tty.main.c_cc[VSTRT] = 255;
1413       tty.main.c_cc[VSTOP] = 255;
1414       tty.main.c_cc[VSUSP] = 255;
1415       tty.main.c_cc[VDSUSP] = 255;
1416 #endif /* IBMR2AIX */
1417       if (flow_control)
1418         {
1419 #ifdef VSTART
1420           tty.main.c_cc[VSTART] = '\021';
1421 #endif /* VSTART */
1422 #ifdef VSTOP
1423           tty.main.c_cc[VSTOP] = '\023';
1424 #endif /* VSTOP */
1425         }
1426       /* Also, PTY overloads NUL and BREAK.
1427          don't ignore break, but don't signal either, so it looks like NUL.
1428          This really serves a purpose only if running in an XTERM window
1429          or via TELNET or the like, but does no harm elsewhere.  */
1430       tty.main.c_iflag &= ~IGNBRK;
1431       tty.main.c_iflag &= ~BRKINT;
1432 #endif
1433 #else /* if not HAVE_TERMIO */
1434 #ifdef VMS
1435       tty.main.tt_char |= TT$M_NOECHO;
1436       if (meta_key)
1437         tty.main.tt_char |= TT$M_EIGHTBIT;
1438       if (flow_control)
1439         tty.main.tt_char |= TT$M_TTSYNC;
1440       else
1441         tty.main.tt_char &= ~TT$M_TTSYNC;
1442       tty.main.tt2_char |= TT2$M_PASTHRU | TT2$M_XON;
1443 #else /* not VMS (BSD, that is) */
1444 #ifndef DOS_NT
1445       Vtty_erase_char = tty.main.sg_erase;
1446       tty.main.sg_flags &= ~(ECHO | CRMOD | XTABS);
1447       if (meta_key)
1448         tty.main.sg_flags |= ANYP;
1449       tty.main.sg_flags |= interrupt_input ? RAW : CBREAK;
1450 #endif /* not DOS_NT */
1451 #endif /* not VMS (BSD, that is) */
1452 #endif /* not HAVE_TERMIO */
1453
1454       /* If going to use CBREAK mode, we must request C-g to interrupt
1455          and turn off start and stop chars, etc.  If not going to use
1456          CBREAK mode, do this anyway so as to turn off local flow
1457          control for user coming over network on 4.2; in this case,
1458          only t_stopc and t_startc really matter.  */
1459 #ifndef HAVE_TERMIO
1460 #ifdef HAVE_TCHARS
1461       /* Note: if not using CBREAK mode, it makes no difference how we
1462          set this */
1463       tty.tchars = new_tchars;
1464       tty.tchars.t_intrc = quit_char;
1465       if (flow_control)
1466         {
1467           tty.tchars.t_startc = '\021';
1468           tty.tchars.t_stopc = '\023';
1469         }
1470
1471       tty.lmode = LDECCTQ | LLITOUT | LPASS8 | LNOFLSH | old_tty.lmode;
1472 #ifdef ultrix
1473       /* Under Ultrix 4.2a, leaving this out doesn't seem to hurt
1474          anything, and leaving it in breaks the meta key.  Go figure.  */
1475       tty.lmode &= ~LLITOUT;
1476 #endif
1477
1478 #ifdef BSD4_1
1479       lmode = tty.lmode;
1480 #endif
1481
1482 #endif /* HAVE_TCHARS */
1483 #endif /* not HAVE_TERMIO */
1484
1485 #ifdef HAVE_LTCHARS
1486       tty.ltchars = new_ltchars;
1487 #endif /* HAVE_LTCHARS */
1488 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
1489       if (!term_initted)
1490         internal_terminal_init ();
1491       dos_ttraw ();
1492 #endif
1493
1494       EMACS_SET_TTY (input_fd, &tty, 0);
1495
1496       /* This code added to insure that, if flow-control is not to be used,
1497          we have an unlocked terminal at the start. */
1498
1499 #ifdef TCXONC
1500       if (!flow_control) ioctl (input_fd, TCXONC, 1);
1501 #endif
1502 #ifndef APOLLO
1503 #ifdef TIOCSTART
1504       if (!flow_control) ioctl (input_fd, TIOCSTART, 0);
1505 #endif
1506 #endif
1507
1508 #if defined (HAVE_TERMIOS) || defined (HPUX9)
1509 #ifdef TCOON
1510       if (!flow_control) tcflow (input_fd, TCOON);
1511 #endif
1512 #endif
1513
1514 #ifdef AIXHFT
1515       hft_init ();
1516 #ifdef IBMR2AIX
1517       {
1518         /* IBM's HFT device usually thinks a ^J should be LF/CR.  We need it
1519            to be only LF.  This is the way that is done. */
1520         struct termio tty;
1521
1522         if (ioctl (1, HFTGETID, &tty) != -1)
1523           write (1, "\033[20l", 5);
1524       }
1525 #endif
1526 #endif /* AIXHFT */
1527
1528 #ifdef VMS
1529 /*  Appears to do nothing when in PASTHRU mode.
1530       SYS$QIOW (0, input_fd, IO$_SETMODE|IO$M_OUTBAND, 0, 0, 0,
1531                 interrupt_signal, oob_chars, 0, 0, 0, 0);
1532 */
1533       queue_kbd_input (0);
1534 #endif /* VMS */
1535     }
1536
1537 #ifdef F_SETFL
1538 #ifndef F_SETOWN_BUG
1539 #ifdef F_GETOWN         /* F_SETFL does not imply existence of F_GETOWN */
1540   if (interrupt_input
1541       && ! read_socket_hook && EQ (Vwindow_system, Qnil))
1542     {
1543       old_fcntl_owner = fcntl (input_fd, F_GETOWN, 0);
1544       fcntl (input_fd, F_SETOWN, getpid ());
1545       init_sigio (input_fd);
1546     }
1547 #endif /* F_GETOWN */
1548 #endif /* F_SETOWN_BUG */
1549 #endif /* F_SETFL */
1550
1551 #ifdef BSD4_1
1552   if (interrupt_input)
1553     init_sigio (input_fd);
1554 #endif
1555
1556 #ifdef VMS  /* VMS sometimes has this symbol but lacks setvbuf.  */
1557 #undef _IOFBF
1558 #endif
1559 #ifdef _IOFBF
1560   /* This symbol is defined on recent USG systems.
1561      Someone says without this call USG won't really buffer the file
1562      even with a call to setbuf. */
1563   setvbuf (stdout, _sobuf, _IOFBF, sizeof _sobuf);
1564 #else
1565   setbuf (stdout, _sobuf);
1566 #endif
1567 #ifdef HAVE_WINDOW_SYSTEM
1568   /* Emacs' window system on MSDOG uses the `internal terminal' and therefore
1569      needs the initialization code below.  */
1570   if (EQ (Vwindow_system, Qnil)
1571 #ifndef WINDOWSNT
1572       /* When running in tty mode on NT/Win95, we have a read_socket
1573          hook, but still need the rest of the initialization code below.  */
1574       && (! read_socket_hook)
1575 #endif
1576       )
1577 #endif
1578     set_terminal_modes ();
1579
1580   if (term_initted && no_redraw_on_reenter)
1581     {
1582       if (display_completed)
1583         direct_output_forward_char (0);
1584     }
1585   else
1586     {
1587       frame_garbaged = 1;
1588       if (FRAMEP (Vterminal_frame))
1589         FRAME_GARBAGED_P (XFRAME (Vterminal_frame)) = 1;
1590     }
1591
1592   term_initted = 1;
1593 }
1594
1595 /* Return nonzero if safe to use tabs in output.
1596    At the time this is called, init_sys_modes has not been done yet.  */
1597
1598 tabs_safe_p ()
1599 {
1600   struct emacs_tty tty;
1601
1602   EMACS_GET_TTY (input_fd, &tty);
1603   return EMACS_TTY_TABS_OK (&tty);
1604 }
1605 \f
1606 /* Get terminal size from system.
1607    Store number of lines into *HEIGHTP and width into *WIDTHP.
1608    We store 0 if there's no valid information.  */
1609
1610 void
1611 get_frame_size (widthp, heightp)
1612      int *widthp, *heightp;
1613 {
1614
1615 #ifdef TIOCGWINSZ
1616
1617   /* BSD-style.  */
1618   struct winsize size;
1619
1620   if (ioctl (input_fd, TIOCGWINSZ, &size) == -1)
1621     *widthp = *heightp = 0;
1622   else
1623     {
1624       *widthp = size.ws_col;
1625       *heightp = size.ws_row;
1626     }
1627
1628 #else
1629 #ifdef TIOCGSIZE
1630
1631   /* SunOS - style.  */
1632   struct ttysize size;
1633
1634   if (ioctl (input_fd, TIOCGSIZE, &size) == -1)
1635     *widthp = *heightp = 0;
1636   else
1637     {
1638       *widthp = size.ts_cols;
1639       *heightp = size.ts_lines;
1640     }
1641
1642 #else
1643 #ifdef VMS
1644
1645   struct sensemode tty;
1646
1647   SYS$QIOW (0, input_fd, IO$_SENSEMODE, &tty, 0, 0,
1648             &tty.class, 12, 0, 0, 0, 0);
1649   *widthp = tty.scr_wid;
1650   *heightp = tty.scr_len;
1651
1652 #else
1653 #ifdef MSDOS
1654   *widthp = ScreenCols ();
1655   *heightp = ScreenRows ();
1656 #else /* system doesn't know size */
1657   *widthp = 0;
1658   *heightp = 0;
1659 #endif
1660
1661 #endif /* not VMS */
1662 #endif /* not SunOS-style */
1663 #endif /* not BSD-style */
1664 }
1665
1666 /* Set the logical window size associated with descriptor FD
1667    to HEIGHT and WIDTH.  This is used mainly with ptys.  */
1668
1669 int
1670 set_window_size (fd, height, width)
1671      int fd, height, width;
1672 {
1673 #ifdef TIOCSWINSZ
1674
1675   /* BSD-style.  */
1676   struct winsize size;
1677   size.ws_row = height;
1678   size.ws_col = width;
1679
1680   if (ioctl (fd, TIOCSWINSZ, &size) == -1)
1681     return 0; /* error */
1682   else
1683     return 1;
1684
1685 #else
1686 #ifdef TIOCSSIZE
1687
1688   /* SunOS - style.  */
1689   struct ttysize size;
1690   size.ts_lines = height;
1691   size.ts_cols = width;
1692
1693   if (ioctl (fd, TIOCGSIZE, &size) == -1)
1694     return 0;
1695   else
1696     return 1;
1697 #else
1698   return -1;
1699 #endif /* not SunOS-style */
1700 #endif /* not BSD-style */
1701 }
1702
1703 \f
1704 /* Prepare the terminal for exiting Emacs; move the cursor to the
1705    bottom of the frame, turn off interrupt-driven I/O, etc.  */
1706 void
1707 reset_sys_modes ()
1708 {
1709   if (noninteractive)
1710     {
1711       fflush (stdout);
1712       return;
1713     }
1714   if (!term_initted)
1715     return;
1716 #ifdef HAVE_WINDOW_SYSTEM
1717   /* Emacs' window system on MSDOG uses the `internal terminal' and therefore
1718      needs the clean-up code below.  */
1719   if (!EQ (Vwindow_system, Qnil)
1720 #ifndef WINDOWSNT
1721       /* When running in tty mode on NT/Win95, we have a read_socket
1722          hook, but still need the rest of the clean-up code below.  */
1723       || read_socket_hook
1724 #endif
1725       )
1726     return;
1727 #endif
1728   cursor_to (FRAME_HEIGHT (selected_frame) - 1, 0);
1729   clear_end_of_line (FRAME_WIDTH (selected_frame));
1730   /* clear_end_of_line may move the cursor */
1731   cursor_to (FRAME_HEIGHT (selected_frame) - 1, 0);
1732 #if defined (IBMR2AIX) && defined (AIXHFT)
1733   {
1734     /* HFT devices normally use ^J as a LF/CR.  We forced it to
1735        do the LF only.  Now, we need to reset it. */
1736     struct termio tty;
1737
1738     if (ioctl (1, HFTGETID, &tty) != -1)
1739       write (1, "\033[20h", 5);
1740   }
1741 #endif
1742
1743   reset_terminal_modes ();
1744   fflush (stdout);
1745 #ifdef BSD_SYSTEM
1746 #ifndef BSD4_1
1747   /* Avoid possible loss of output when changing terminal modes.  */
1748   fsync (fileno (stdout));
1749 #endif
1750 #endif
1751
1752 #ifdef F_SETFL
1753 #ifndef F_SETOWN_BUG
1754 #ifdef F_SETOWN         /* F_SETFL does not imply existence of F_SETOWN */
1755   if (interrupt_input)
1756     {
1757       reset_sigio ();
1758       fcntl (input_fd, F_SETOWN, old_fcntl_owner);
1759     }
1760 #endif /* F_SETOWN */
1761 #endif /* F_SETOWN_BUG */
1762 #ifdef O_NDELAY
1763   fcntl (input_fd, F_SETFL, fcntl (input_fd, F_GETFL, 0) & ~O_NDELAY);
1764 #endif
1765 #endif /* F_SETFL */
1766 #ifdef BSD4_1
1767   if (interrupt_input)
1768     reset_sigio ();
1769 #endif /* BSD4_1 */
1770
1771   if (old_tty_valid)
1772     while (EMACS_SET_TTY (input_fd, &old_tty, 0) < 0 && errno == EINTR)
1773       ;
1774
1775 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
1776   dos_ttcooked ();
1777 #endif
1778
1779 #ifdef SET_LINE_DISCIPLINE
1780   /* Ultrix's termios *ignores* any line discipline except TERMIODISC.
1781      A different old line discipline is therefore not restored, yet.
1782      Restore the old line discipline by hand.  */
1783   ioctl (0, TIOCSETD, &old_tty.main.c_line);
1784 #endif
1785
1786 #ifdef AIXHFT
1787   hft_reset ();
1788 #endif
1789
1790 #ifdef BSD_PGRPS
1791   widen_foreground_group ();
1792 #endif
1793 }
1794 \f
1795 #ifdef HAVE_PTYS
1796
1797 /* Set up the proper status flags for use of a pty.  */
1798
1799 void
1800 setup_pty (fd)
1801      int fd;
1802 {
1803   /* I'm told that TOICREMOTE does not mean control chars
1804      "can't be sent" but rather that they don't have
1805      input-editing or signaling effects.
1806      That should be good, because we have other ways
1807      to do those things in Emacs.
1808      However, telnet mode seems not to work on 4.2.
1809      So TIOCREMOTE is turned off now. */
1810
1811   /* Under hp-ux, if TIOCREMOTE is turned on, some calls
1812      will hang.  In particular, the "timeout" feature (which
1813      causes a read to return if there is no data available)
1814      does this.  Also it is known that telnet mode will hang
1815      in such a way that Emacs must be stopped (perhaps this
1816      is the same problem).
1817
1818      If TIOCREMOTE is turned off, then there is a bug in
1819      hp-ux which sometimes loses data.  Apparently the
1820      code which blocks the master process when the internal
1821      buffer fills up does not work.  Other than this,
1822      though, everything else seems to work fine.
1823
1824      Since the latter lossage is more benign, we may as well
1825      lose that way.  -- cph */
1826 #ifdef FIONBIO
1827 #ifdef SYSV_PTYS
1828   {
1829     int on = 1;
1830     ioctl (fd, FIONBIO, &on);
1831   }
1832 #endif
1833 #endif
1834 #ifdef IBMRTAIX
1835   /* On AIX, the parent gets SIGHUP when a pty attached child dies.  So, we */
1836   /* ignore SIGHUP once we've started a child on a pty.  Note that this may */
1837   /* cause EMACS not to die when it should, i.e., when its own controlling  */
1838   /* tty goes away.  I've complained to the AIX developers, and they may    */
1839   /* change this behavior, but I'm not going to hold my breath.             */
1840   signal (SIGHUP, SIG_IGN);
1841 #endif
1842 }
1843 #endif /* HAVE_PTYS */
1844 \f
1845 #ifdef VMS
1846
1847 /* Assigning an input channel is done at the start of Emacs execution.
1848    This is called each time Emacs is resumed, also, but does nothing
1849    because input_chain is no longer zero.  */
1850
1851 init_vms_input ()
1852 {
1853   int status;
1854
1855   if (input_fd == 0)
1856     {
1857       status = SYS$ASSIGN (&input_dsc, &input_fd, 0, 0);
1858       if (! (status & 1))
1859         LIB$STOP (status);
1860     }
1861 }
1862
1863 /* Deassigning the input channel is done before exiting.  */
1864
1865 stop_vms_input ()
1866 {
1867   return SYS$DASSGN (input_fd);
1868 }
1869
1870 short input_buffer;
1871
1872 /* Request reading one character into the keyboard buffer.
1873    This is done as soon as the buffer becomes empty.  */
1874
1875 queue_kbd_input ()
1876 {
1877   int status;
1878   extern kbd_input_ast ();
1879
1880   waiting_for_ast = 0;
1881   stop_input = 0;
1882   status = SYS$QIO (0, input_fd, IO$_READVBLK,
1883                     &input_iosb, kbd_input_ast, 1,
1884                     &input_buffer, 1, 0, terminator_mask, 0, 0);
1885 }
1886
1887 int input_count;
1888
1889 /* Ast routine that is called when keyboard input comes in
1890    in accord with the SYS$QIO above.  */
1891
1892 kbd_input_ast ()
1893 {
1894   register int c = -1;
1895   int old_errno = errno;
1896   extern EMACS_TIME *input_available_clear_time;
1897
1898   if (waiting_for_ast)
1899     SYS$SETEF (input_ef);
1900   waiting_for_ast = 0;
1901   input_count++;
1902 #ifdef ASTDEBUG
1903   if (input_count == 25)
1904     exit (1);
1905   printf ("Ast # %d,", input_count);
1906   printf (" iosb = %x, %x, %x, %x",
1907           input_iosb.offset, input_iosb.status, input_iosb.termlen,
1908           input_iosb.term);
1909 #endif
1910   if (input_iosb.offset)
1911     {
1912       c = input_buffer;
1913 #ifdef ASTDEBUG
1914       printf (", char = 0%o", c);
1915 #endif
1916     }
1917 #ifdef ASTDEBUG
1918   printf ("\n");
1919   fflush (stdout);
1920   sleep (1);
1921 #endif
1922   if (! stop_input)
1923     queue_kbd_input ();
1924   if (c >= 0)
1925     {
1926       struct input_event e;
1927       e.kind = ascii_keystroke;
1928       XSETINT (e.code, c);
1929       XSETFRAME (e.frame_or_window, selected_frame);
1930       kbd_buffer_store_event (&e);
1931     }
1932   if (input_available_clear_time)
1933     EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0);
1934   errno = old_errno;
1935 }
1936
1937 /* Wait until there is something in kbd_buffer.  */
1938
1939 wait_for_kbd_input ()
1940 {
1941   extern int have_process_input, process_exited;
1942
1943   /* If already something, avoid doing system calls.  */
1944   if (detect_input_pending ())
1945     {
1946       return;
1947     }
1948   /* Clear a flag, and tell ast routine above to set it.  */
1949   SYS$CLREF (input_ef);
1950   waiting_for_ast = 1;
1951   /* Check for timing error: ast happened while we were doing that.  */
1952   if (!detect_input_pending ())
1953     {
1954       /* No timing error: wait for flag to be set.  */
1955       set_waiting_for_input (0);
1956       SYS$WFLOR (input_ef, input_eflist);
1957       clear_waiting_for_input (0);
1958       if (!detect_input_pending ())
1959         /* Check for subprocess input availability */
1960         {
1961           int dsp = have_process_input || process_exited;
1962
1963           SYS$CLREF (process_ef);
1964           if (have_process_input)
1965             process_command_input ();
1966           if (process_exited)
1967             process_exit ();
1968           if (dsp)
1969             {
1970               update_mode_lines++;
1971               prepare_menu_bars ();
1972               redisplay_preserve_echo_area ();
1973             }
1974         }
1975     }
1976   waiting_for_ast = 0;
1977 }
1978
1979 /* Get rid of any pending QIO, when we are about to suspend
1980    or when we want to throw away pending input.
1981    We wait for a positive sign that the AST routine has run
1982    and therefore there is no I/O request queued when we return.
1983    SYS$SETAST is used to avoid a timing error.  */
1984
1985 end_kbd_input ()
1986 {
1987 #ifdef ASTDEBUG
1988   printf ("At end_kbd_input.\n");
1989   fflush (stdout);
1990   sleep (1);
1991 #endif
1992   if (LIB$AST_IN_PROG ())  /* Don't wait if suspending from kbd_buffer_store_event! */
1993     {
1994       SYS$CANCEL (input_fd);
1995       return;
1996     }
1997
1998   SYS$SETAST (0);
1999   /* Clear a flag, and tell ast routine above to set it.  */
2000   SYS$CLREF (input_ef);
2001   waiting_for_ast = 1;
2002   stop_input = 1;
2003   SYS$CANCEL (input_fd);
2004   SYS$SETAST (1);
2005   SYS$WAITFR (input_ef);
2006   waiting_for_ast = 0;
2007 }
2008
2009 /* Wait for either input available or time interval expiry.  */
2010
2011 input_wait_timeout (timeval)
2012      int timeval;               /* Time to wait, in seconds */
2013 {
2014   int time [2];
2015   static int zero = 0;
2016   static int large = -10000000;
2017
2018   LIB$EMUL (&timeval, &large, &zero, time);       /* Convert to VMS format */
2019
2020   /* If already something, avoid doing system calls.  */
2021   if (detect_input_pending ())
2022     {
2023       return;
2024     }
2025   /* Clear a flag, and tell ast routine above to set it.  */
2026   SYS$CLREF (input_ef);
2027   waiting_for_ast = 1;
2028   /* Check for timing error: ast happened while we were doing that.  */
2029   if (!detect_input_pending ())
2030     {
2031       /* No timing error: wait for flag to be set.  */
2032       SYS$CANTIM (1, 0);
2033       if (SYS$SETIMR (timer_ef, time, 0, 1) & 1) /* Set timer */
2034         SYS$WFLOR (timer_ef, timer_eflist);       /* Wait for timer expiry or input */
2035     }
2036   waiting_for_ast = 0;
2037 }
2038
2039 /* The standard `sleep' routine works some other way
2040    and it stops working if you have ever quit out of it.
2041    This one continues to work.  */
2042
2043 sys_sleep (timeval)
2044      int timeval;
2045 {
2046   int time [2];
2047   static int zero = 0;
2048   static int large = -10000000;
2049
2050   LIB$EMUL (&timeval, &large, &zero, time);       /* Convert to VMS format */
2051
2052   SYS$CANTIM (1, 0);
2053   if (SYS$SETIMR (timer_ef, time, 0, 1) & 1) /* Set timer */
2054     SYS$WAITFR (timer_ef);        /* Wait for timer expiry only */
2055 }
2056
2057 void
2058 init_sigio (fd)
2059      int fd;
2060 {
2061   request_sigio ();
2062 }
2063
2064 reset_sigio ()
2065 {
2066   unrequest_sigio ();
2067 }
2068
2069 void
2070 request_sigio ()
2071 {
2072   croak ("request sigio");
2073 }
2074
2075 void
2076 unrequest_sigio ()
2077 {
2078   croak ("unrequest sigio");
2079 }
2080
2081 #endif /* VMS */
2082 \f
2083 /* Note that VMS compiler won't accept defined (CANNOT_DUMP).  */
2084 #ifndef CANNOT_DUMP
2085 #define NEED_STARTS
2086 #endif
2087
2088 #ifndef SYSTEM_MALLOC
2089 #ifndef NEED_STARTS
2090 #define NEED_STARTS
2091 #endif
2092 #endif
2093
2094 #ifdef NEED_STARTS
2095 /* Some systems that cannot dump also cannot implement these.  */
2096
2097 /*
2098  *      Return the address of the start of the text segment prior to
2099  *      doing an unexec.  After unexec the return value is undefined.
2100  *      See crt0.c for further explanation and _start.
2101  *
2102  */
2103
2104 #ifndef HAVE_TEXT_START
2105 char *
2106 start_of_text ()
2107 {
2108 #ifdef TEXT_START
2109   return ((char *) TEXT_START);
2110 #else
2111 #ifdef GOULD
2112   extern csrt ();
2113   return ((char *) csrt);
2114 #else /* not GOULD */
2115   extern int _start ();
2116   return ((char *) _start);
2117 #endif /* GOULD */
2118 #endif /* TEXT_START */
2119 }
2120 #endif /* not HAVE_TEXT_START */
2121
2122 /*
2123  *      Return the address of the start of the data segment prior to
2124  *      doing an unexec.  After unexec the return value is undefined.
2125  *      See crt0.c for further information and definition of data_start.
2126  *
2127  *      Apparently, on BSD systems this is etext at startup.  On
2128  *      USG systems (swapping) this is highly mmu dependent and
2129  *      is also dependent on whether or not the program is running
2130  *      with shared text.  Generally there is a (possibly large)
2131  *      gap between end of text and start of data with shared text.
2132  *
2133  *      On Uniplus+ systems with shared text, data starts at a
2134  *      fixed address.  Each port (from a given oem) is generally
2135  *      different, and the specific value of the start of data can
2136  *      be obtained via the UniPlus+ specific "uvar" system call,
2137  *      however the method outlined in crt0.c seems to be more portable.
2138  *
2139  *      Probably what will have to happen when a USG unexec is available,
2140  *      at least on UniPlus, is temacs will have to be made unshared so
2141  *      that text and data are contiguous.  Then once loadup is complete,
2142  *      unexec will produce a shared executable where the data can be
2143  *      at the normal shared text boundary and the startofdata variable
2144  *      will be patched by unexec to the correct value.
2145  *
2146  */
2147
2148 char *
2149 start_of_data ()
2150 {
2151 #ifdef DATA_START
2152   return ((char *) DATA_START);
2153 #else
2154 #ifdef ORDINARY_LINK
2155   /*
2156    * This is a hack.  Since we're not linking crt0.c or pre_crt0.c,
2157    * data_start isn't defined.  We take the address of environ, which
2158    * is known to live at or near the start of the system crt0.c, and
2159    * we don't sweat the handful of bytes that might lose.
2160    */
2161   extern char **environ;
2162
2163   return((char *) &environ);
2164 #else
2165   extern int data_start;
2166   return ((char *) &data_start);
2167 #endif /* ORDINARY_LINK */
2168 #endif /* DATA_START */
2169 }
2170 #endif /* NEED_STARTS (not CANNOT_DUMP or not SYSTEM_MALLOC) */
2171
2172 #ifndef CANNOT_DUMP
2173 /* Some systems that cannot dump also cannot implement these.  */
2174
2175 /*
2176  *      Return the address of the end of the text segment prior to
2177  *      doing an unexec.  After unexec the return value is undefined.
2178  */
2179
2180 char *
2181 end_of_text ()
2182 {
2183 #ifdef TEXT_END
2184   return ((char *) TEXT_END);
2185 #else
2186   extern int etext;
2187   return ((char *) &etext);
2188 #endif
2189 }
2190
2191 /*
2192  *      Return the address of the end of the data segment prior to
2193  *      doing an unexec.  After unexec the return value is undefined.
2194  */
2195
2196 char *
2197 end_of_data ()
2198 {
2199 #ifdef DATA_END
2200   return ((char *) DATA_END);
2201 #else
2202   extern int edata;
2203   return ((char *) &edata);
2204 #endif
2205 }
2206
2207 #endif /* not CANNOT_DUMP */
2208 \f
2209 /* init_system_name sets up the string for the Lisp function
2210    system-name to return. */
2211
2212 #ifdef BSD4_1
2213 #include <whoami.h>
2214 #endif
2215
2216 extern Lisp_Object Vsystem_name;
2217
2218 #ifndef BSD4_1
2219 #ifndef VMS
2220 #ifdef HAVE_SOCKETS
2221 #include <sys/socket.h>
2222 #include <netdb.h>
2223 #endif /* HAVE_SOCKETS */
2224 #endif /* not VMS */
2225 #endif /* not BSD4_1 */
2226
2227 void
2228 init_system_name ()
2229 {
2230 #ifdef BSD4_1
2231   Vsystem_name = build_string (sysname);
2232 #else
2233 #ifdef VMS
2234   char *sp, *end;
2235   if ((sp = egetenv ("SYS$NODE")) == 0)
2236     Vsystem_name = build_string ("vax-vms");
2237   else if ((end = index (sp, ':')) == 0)
2238     Vsystem_name = build_string (sp);
2239   else
2240     Vsystem_name = make_string (sp, end - sp);
2241 #else
2242 #ifndef HAVE_GETHOSTNAME
2243   struct utsname uts;
2244   uname (&uts);
2245   Vsystem_name = build_string (uts.nodename);
2246 #else /* HAVE_GETHOSTNAME */
2247   unsigned int hostname_size = 256;
2248   char *hostname = (char *) alloca (hostname_size);
2249
2250   /* Try to get the host name; if the buffer is too short, try
2251      again.  Apparently, the only indication gethostname gives of
2252      whether the buffer was large enough is the presence or absence
2253      of a '\0' in the string.  Eech.  */
2254   for (;;)
2255     {
2256       gethostname (hostname, hostname_size - 1);
2257       hostname[hostname_size - 1] = '\0';
2258
2259       /* Was the buffer large enough for the '\0'?  */
2260       if (strlen (hostname) < hostname_size - 1)
2261         break;
2262
2263       hostname_size <<= 1;
2264       hostname = (char *) alloca (hostname_size);
2265     }
2266 #ifdef HAVE_SOCKETS
2267   /* Turn the hostname into the official, fully-qualified hostname.
2268      Don't do this if we're going to dump; this can confuse system
2269      libraries on some machines and make the dumped emacs core dump. */
2270 #ifndef CANNOT_DUMP
2271   if (initialized)
2272 #endif /* not CANNOT_DUMP */
2273     if (! index (hostname, '.'))
2274       {
2275         struct hostent *hp;
2276         int count;
2277         for (count = 0;; count++)
2278           {
2279 #ifdef TRY_AGAIN
2280             h_errno = 0;
2281 #endif
2282             hp = gethostbyname (hostname);
2283 #ifdef TRY_AGAIN
2284             if (! (hp == 0 && h_errno == TRY_AGAIN))
2285 #endif
2286               break;
2287             if (count >= 5)
2288               break;
2289             Fsleep_for (make_number (1), Qnil);
2290           }
2291         if (hp)
2292           {
2293             char *fqdn = (char *) hp->h_name;
2294             char *p;
2295
2296             if (!index (fqdn, '.'))
2297               {
2298                 /* We still don't have a fully qualified domain name.
2299                    Try to find one in the list of alternate names */
2300                 char **alias = hp->h_aliases;
2301                 while (*alias && !index (*alias, '.'))
2302                   alias++;
2303                 if (*alias)
2304                   fqdn = *alias;
2305               }
2306             hostname = fqdn;
2307 #if 0
2308             /* Convert the host name to lower case.  */
2309             /* Using ctype.h here would introduce a possible locale
2310                dependence that is probably wrong for hostnames.  */
2311             p = hostname;
2312             while (*p)
2313               {
2314                 if (*p >= 'A' && *p <= 'Z')
2315                   *p += 'a' - 'A';
2316                 p++;
2317               }
2318 #endif
2319           }
2320       }
2321 #endif /* HAVE_SOCKETS */
2322   /* We used to try using getdomainname here,
2323      but NIIBE Yutaka <gniibe@etl.go.jp> says that
2324      getdomainname gets the NIS/YP domain which often is not the same
2325      as in Internet domain name.  */
2326 #if 0 /* Turned off because sysinfo is not really likely to return the
2327          correct Internet domain.  */
2328 #if (HAVE_SYSINFO && defined (SI_SRPC_DOMAIN))
2329   if (! index (hostname, '.'))
2330     {
2331       /* The hostname is not fully qualified.  Append the domain name.  */
2332
2333       int hostlen = strlen (hostname);
2334       int domain_size = 256;
2335
2336       for (;;)
2337         {
2338           char *domain = (char *) alloca (domain_size + 1);
2339           char *fqdn = (char *) alloca (hostlen + 1 + domain_size + 1);
2340           int sys_domain_size = sysinfo (SI_SRPC_DOMAIN, domain, domain_size);
2341           if (sys_domain_size <= 0)
2342             break;
2343           if (domain_size < sys_domain_size)
2344             {
2345               domain_size = sys_domain_size;
2346               continue;
2347             }
2348           strcpy (fqdn, hostname);
2349           if (domain[0] == '.')
2350             strcpy (fqdn + hostlen, domain);
2351           else if (domain[0] != 0)
2352             {
2353               fqdn[hostlen] = '.';
2354               strcpy (fqdn + hostlen + 1, domain);
2355             }
2356           hostname = fqdn;
2357           break;
2358         }
2359     }
2360 #endif /* HAVE_SYSINFO && defined (SI_SRPC_DOMAIN) */
2361 #endif /* 0 */
2362   Vsystem_name = build_string (hostname);
2363 #endif /* HAVE_GETHOSTNAME */
2364 #endif /* VMS */
2365 #endif /* BSD4_1 */
2366   {
2367     unsigned char *p;
2368     for (p = XSTRING (Vsystem_name)->data; *p; p++)
2369       if (*p == ' ' || *p == '\t')
2370         *p = '-';
2371   }
2372 }
2373 \f
2374 #ifndef MSDOS
2375 #ifndef VMS
2376 #if !defined (HAVE_SELECT) || defined (BROKEN_SELECT_NON_X)
2377
2378 #include "sysselect.h"
2379 #undef select
2380
2381 #if defined (HAVE_X_WINDOWS) && !defined (HAVE_SELECT)
2382 /* Cause explanatory error message at compile time,
2383    since the select emulation is not good enough for X.  */
2384 int *x = &x_windows_lose_if_no_select_system_call;
2385 #endif
2386
2387 /* Emulate as much as select as is possible under 4.1 and needed by Gnu Emacs
2388  * Only checks read descriptors.
2389  */
2390 /* How long to wait between checking fds in select */
2391 #define SELECT_PAUSE 1
2392 int select_alarmed;
2393
2394 /* For longjmp'ing back to read_input_waiting.  */
2395
2396 jmp_buf read_alarm_throw;
2397
2398 /* Nonzero if the alarm signal should throw back to read_input_waiting.
2399    The read_socket_hook function sets this to 1 while it is waiting.  */
2400
2401 int read_alarm_should_throw;
2402
2403 SIGTYPE
2404 select_alarm ()
2405 {
2406   select_alarmed = 1;
2407 #ifdef BSD4_1
2408   sigrelse (SIGALRM);
2409 #else /* not BSD4_1 */
2410   signal (SIGALRM, SIG_IGN);
2411 #endif /* not BSD4_1 */
2412   if (read_alarm_should_throw)
2413     longjmp (read_alarm_throw, 1);
2414 }
2415
2416 #ifndef WINDOWSNT
2417 /* Only rfds are checked.  */
2418 int
2419 sys_select (nfds, rfds, wfds, efds, timeout)
2420      int nfds;
2421      SELECT_TYPE *rfds, *wfds, *efds;
2422      EMACS_TIME *timeout;
2423 {
2424   int ravail = 0, old_alarm;
2425   SELECT_TYPE orfds;
2426   int timeoutval;
2427   int *local_timeout;
2428   extern int proc_buffered_char[];
2429 #ifndef subprocesses
2430   int process_tick = 0, update_tick = 0;
2431 #else
2432   extern int process_tick, update_tick;
2433 #endif
2434   SIGTYPE (*old_trap) ();
2435   unsigned char buf;
2436
2437 #if defined (HAVE_SELECT) && defined (HAVE_X_WINDOWS)
2438   /* If we're using X, then the native select will work; we only need the
2439      emulation for non-X usage.  */
2440   if (!NILP (Vwindow_system))
2441     return select (nfds, rfds, wfds, efds, timeout);
2442 #endif
2443   timeoutval = timeout ? EMACS_SECS (*timeout) : 100000;
2444   local_timeout = &timeoutval;
2445   FD_ZERO (&orfds);
2446   if (rfds)
2447     {
2448       orfds = *rfds;
2449       FD_ZERO (rfds);
2450     }
2451   if (wfds)
2452     FD_ZERO (wfds);
2453   if (efds)
2454     FD_ZERO (efds);
2455
2456   /* If we are looking only for the terminal, with no timeout,
2457      just read it and wait -- that's more efficient.  */
2458   if (*local_timeout == 100000 && process_tick == update_tick
2459       && FD_ISSET (0, &orfds))
2460     {
2461       int fd;
2462       for (fd = 1; fd < nfds; ++fd)
2463         if (FD_ISSET (fd, &orfds))
2464           goto hardway;
2465       if (! detect_input_pending ())
2466         read_input_waiting ();
2467       FD_SET (0, rfds);
2468       return 1;
2469     }
2470
2471  hardway:
2472   /* Once a second, till the timer expires, check all the flagged read
2473    * descriptors to see if any input is available.  If there is some then
2474    * set the corresponding bit in the return copy of rfds.
2475    */
2476   while (1)
2477     {
2478       register int to_check, fd;
2479
2480       if (rfds)
2481         {
2482           for (to_check = nfds, fd = 0; --to_check >= 0; fd++)
2483             {
2484               if (FD_ISSET (fd, &orfds))
2485                 {
2486                   int avail = 0, status = 0;
2487
2488                   if (fd == 0)
2489                     avail = detect_input_pending (); /* Special keyboard handler */
2490                   else
2491                     {
2492 #ifdef FIONREAD
2493                       status = ioctl (fd, FIONREAD, &avail);
2494 #else /* no FIONREAD */
2495                       /* Hoping it will return -1 if nothing available
2496                          or 0 if all 0 chars requested are read.  */
2497                       if (proc_buffered_char[fd] >= 0)
2498                         avail = 1;
2499                       else
2500                         {
2501                           avail = read (fd, &buf, 1);
2502                           if (avail > 0)
2503                             proc_buffered_char[fd] = buf;
2504                         }
2505 #endif /* no FIONREAD */
2506                     }
2507                   if (status >= 0 && avail > 0)
2508                     {
2509                       FD_SET (fd, rfds);
2510                       ravail++;
2511                     }
2512                 }
2513             }
2514         }
2515       if (*local_timeout == 0 || ravail != 0 || process_tick != update_tick)
2516         break;
2517       old_alarm = alarm (0);
2518       old_trap = signal (SIGALRM, select_alarm);
2519       select_alarmed = 0;
2520       alarm (SELECT_PAUSE);
2521       /* Wait for a SIGALRM (or maybe a SIGTINT) */
2522       while (select_alarmed == 0 && *local_timeout != 0
2523              && process_tick == update_tick)
2524         {
2525           /* If we are interested in terminal input,
2526              wait by reading the terminal.
2527              That makes instant wakeup for terminal input at least.  */
2528           if (FD_ISSET (0, &orfds))
2529             {
2530               read_input_waiting ();
2531               if (detect_input_pending ())
2532                 select_alarmed = 1;
2533             }
2534           else
2535             pause ();
2536         }
2537       (*local_timeout) -= SELECT_PAUSE;
2538       /* Reset the old alarm if there was one */
2539       alarm (0);
2540       signal (SIGALRM, old_trap);
2541       if (old_alarm != 0)
2542         {
2543           /* Reset or forge an interrupt for the original handler. */
2544           old_alarm -= SELECT_PAUSE;
2545           if (old_alarm <= 0)
2546             kill (getpid (), SIGALRM); /* Fake an alarm with the orig' handler */
2547           else
2548             alarm (old_alarm);
2549         }
2550       if (*local_timeout == 0)  /* Stop on timer being cleared */
2551         break;
2552     }
2553   return ravail;
2554 }
2555 #endif /* not WINDOWSNT */
2556
2557 /* Read keyboard input into the standard buffer,
2558    waiting for at least one character.  */
2559
2560 /* Make all keyboard buffers much bigger when using a window system.  */
2561 #ifdef HAVE_WINDOW_SYSTEM
2562 #define BUFFER_SIZE_FACTOR 16
2563 #else
2564 #define BUFFER_SIZE_FACTOR 1
2565 #endif
2566
2567 read_input_waiting ()
2568 {
2569   struct input_event e;
2570   int nread, i;
2571   extern int quit_char;
2572
2573   if (read_socket_hook)
2574     {
2575       struct input_event buf[256];
2576
2577       read_alarm_should_throw = 0;
2578       if (! setjmp (read_alarm_throw))
2579         nread = (*read_socket_hook) (0, buf, 256, 1, 0);
2580       else
2581         nread = -1;
2582
2583       /* Scan the chars for C-g and store them in kbd_buffer.  */
2584       for (i = 0; i < nread; i++)
2585         {
2586           kbd_buffer_store_event (&buf[i]);
2587           /* Don't look at input that follows a C-g too closely.
2588              This reduces lossage due to autorepeat on C-g.  */
2589           if (buf[i].kind == ascii_keystroke
2590               && buf[i].code == quit_char)
2591             break;
2592         }
2593     }
2594   else
2595     {
2596       char buf[3];
2597       nread = read (fileno (stdin), buf, 1);
2598
2599       /* Scan the chars for C-g and store them in kbd_buffer.  */
2600       e.kind = ascii_keystroke;
2601       XSETFRAME (e.frame_or_window, selected_frame);
2602       e.modifiers = 0;
2603       for (i = 0; i < nread; i++)
2604         {
2605           /* Convert chars > 0177 to meta events if desired.
2606              We do this under the same conditions that read_avail_input does.  */
2607           if (read_socket_hook == 0)
2608             {
2609               /* If the user says she has a meta key, then believe her. */
2610               if (meta_key == 1 && (buf[i] & 0x80))
2611                 e.modifiers = meta_modifier;
2612               if (meta_key != 2)
2613                 buf[i] &= ~0x80;
2614             }
2615
2616           XSETINT (e.code, buf[i]);
2617           kbd_buffer_store_event (&e);
2618           /* Don't look at input that follows a C-g too closely.
2619              This reduces lossage due to autorepeat on C-g.  */
2620           if (buf[i] == quit_char)
2621             break;
2622         }
2623     }
2624 }
2625
2626 #endif /* not HAVE_SELECT */
2627 #endif /* not VMS */
2628 #endif /* not MSDOS */
2629 \f
2630 #ifdef BSD4_1
2631 /*
2632  * Partially emulate 4.2 open call.
2633  * open is defined as this in 4.1.
2634  *
2635  * - added by Michael Bloom @ Citicorp/TTI
2636  *
2637  */
2638
2639 int
2640 sys_open (path, oflag, mode)
2641      char *path;
2642      int oflag, mode;
2643 {
2644   if (oflag & O_CREAT)
2645     return creat (path, mode);
2646   else
2647     return open (path, oflag);
2648 }
2649
2650 void
2651 init_sigio (fd)
2652      int fd;
2653 {
2654   if (noninteractive)
2655     return;
2656   lmode = LINTRUP | lmode;
2657   ioctl (fd, TIOCLSET, &lmode);
2658 }
2659
2660 reset_sigio ()
2661 {
2662   if (noninteractive)
2663     return;
2664   lmode = ~LINTRUP & lmode;
2665   ioctl (0, TIOCLSET, &lmode);
2666 }
2667
2668 void
2669 request_sigio ()
2670 {
2671   sigrelse (SIGTINT);
2672
2673   interrupts_deferred = 0;
2674 }
2675
2676 void
2677 unrequest_sigio ()
2678 {
2679   sighold (SIGTINT);
2680
2681   interrupts_deferred = 1;
2682 }
2683
2684 /* still inside #ifdef BSD4_1 */
2685 #ifdef subprocesses
2686
2687 int sigheld; /* Mask of held signals */
2688
2689 sigholdx (signum)
2690      int signum;
2691 {
2692   sigheld |= sigbit (signum);
2693   sighold (signum);
2694 }
2695
2696 sigisheld (signum)
2697      int signum;
2698 {
2699   sigheld |= sigbit (signum);
2700 }
2701
2702 sigunhold (signum)
2703      int signum;
2704 {
2705   sigheld &= ~sigbit (signum);
2706   sigrelse (signum);
2707 }
2708
2709 sigfree ()    /* Free all held signals */
2710 {
2711   int i;
2712   for (i = 0; i < NSIG; i++)
2713     if (sigheld & sigbit (i))
2714       sigrelse (i);
2715   sigheld = 0;
2716 }
2717
2718 sigbit (i)
2719 {
2720   return 1 << (i - 1);
2721 }
2722 #endif /* subprocesses */
2723 #endif /* BSD4_1 */
2724 \f
2725 /* POSIX signals support - DJB */
2726 /* Anyone with POSIX signals should have ANSI C declarations */
2727
2728 #ifdef POSIX_SIGNALS
2729
2730 sigset_t old_mask, empty_mask, full_mask, temp_mask;
2731 static struct sigaction new_action, old_action;
2732
2733 init_signals ()
2734 {
2735   sigemptyset (&empty_mask);
2736   sigfillset (&full_mask);
2737 }
2738
2739 signal_handler_t
2740 sys_signal (int signal_number, signal_handler_t action)
2741 {
2742   sigemptyset (&new_action.sa_mask);
2743   new_action.sa_handler = (void (*)(int)) action;
2744 #ifdef SA_RESTART
2745   /* Emacs mostly works better with restartable system services. If this
2746    * flag exists, we probably want to turn it on here.
2747    */
2748   new_action.sa_flags = SA_RESTART;
2749 #else
2750   new_action.sa_flags = 0;
2751 #endif
2752   sigaction (signal_number, &new_action, &old_action);
2753   return ((void (*)(int)) old_action.sa_handler);
2754 }
2755
2756 #ifndef __GNUC__
2757 /* If we're compiling with GCC, we don't need this function, since it
2758    can be written as a macro.  */
2759 sigset_t
2760 sys_sigmask (int sig)
2761 {
2762   sigset_t mask;
2763   sigemptyset (&mask);
2764   sigaddset (&mask, sig);
2765   return mask;
2766 }
2767 #endif
2768
2769 int
2770 sys_sigpause (sigset_t new_mask)
2771 {
2772   /* pause emulating berk sigpause... */
2773   sigsuspend (&new_mask);
2774   return (EINTR);
2775 }
2776
2777 /* I'd like to have these guys return pointers to the mask storage in here,
2778    but there'd be trouble if the code was saving multiple masks.  I'll be
2779    safe and pass the structure.  It normally won't be more than 2 bytes
2780    anyhow. - DJB */
2781
2782 sigset_t
2783 sys_sigblock (sigset_t new_mask)
2784 {
2785   sigset_t old_mask;
2786   sigprocmask (SIG_BLOCK, &new_mask, &old_mask);
2787   return (old_mask);
2788 }
2789
2790 sigset_t
2791 sys_sigunblock (sigset_t new_mask)
2792 {
2793   sigset_t old_mask;
2794   sigprocmask (SIG_UNBLOCK, &new_mask, &old_mask);
2795   return (old_mask);
2796 }
2797
2798 sigset_t
2799 sys_sigsetmask (sigset_t new_mask)
2800 {
2801   sigset_t old_mask;
2802   sigprocmask (SIG_SETMASK, &new_mask, &old_mask);
2803   return (old_mask);
2804 }
2805
2806 #endif /* POSIX_SIGNALS */
2807 \f
2808 #ifndef HAVE_RANDOM
2809 #ifdef random
2810 #define HAVE_RANDOM
2811 #endif
2812 #endif
2813
2814 /* Figure out how many bits the system's random number generator uses.
2815    `random' and `lrand48' are assumed to return 31 usable bits.
2816    BSD `rand' returns a 31 bit value but the low order bits are unusable;
2817    so we'll shift it and treat it like the 15-bit USG `rand'.  */
2818
2819 #ifndef RAND_BITS
2820 # ifdef HAVE_RANDOM
2821 #  define RAND_BITS 31
2822 # else /* !HAVE_RANDOM */
2823 #  ifdef HAVE_LRAND48
2824 #   define RAND_BITS 31
2825 #   define random lrand48
2826 #  else /* !HAVE_LRAND48 */
2827 #   define RAND_BITS 15
2828 #   if RAND_MAX == 32767
2829 #    define random rand
2830 #   else /* RAND_MAX != 32767 */
2831 #    if RAND_MAX == 2147483647
2832 #     define random() (rand () >> 16)
2833 #    else /* RAND_MAX != 2147483647 */
2834 #     ifdef USG
2835 #      define random rand
2836 #     else
2837 #      define random() (rand () >> 16)
2838 #     endif /* !USG */
2839 #    endif /* RAND_MAX != 2147483647 */
2840 #   endif /* RAND_MAX != 32767 */
2841 #  endif /* !HAVE_LRAND48 */
2842 # endif /* !HAVE_RANDOM */
2843 #endif /* !RAND_BITS */
2844
2845 void
2846 seed_random (arg)
2847      long arg;
2848 {
2849 #ifdef HAVE_RANDOM
2850   srandom ((unsigned int)arg);
2851 #else
2852 # ifdef HAVE_LRAND48
2853   srand48 (arg);
2854 # else
2855   srand ((unsigned int)arg);
2856 # endif
2857 #endif
2858 }
2859
2860 /*
2861  * Build a full Emacs-sized word out of whatever we've got.
2862  * This suffices even for a 64-bit architecture with a 15-bit rand.
2863  */
2864 long
2865 get_random ()
2866 {
2867   long val = random ();
2868 #if VALBITS > RAND_BITS
2869   val = (val << RAND_BITS) ^ random ();
2870 #if VALBITS > 2*RAND_BITS
2871   val = (val << RAND_BITS) ^ random ();
2872 #if VALBITS > 3*RAND_BITS
2873   val = (val << RAND_BITS) ^ random ();
2874 #if VALBITS > 4*RAND_BITS
2875   val = (val << RAND_BITS) ^ random ();
2876 #endif /* need at least 5 */
2877 #endif /* need at least 4 */
2878 #endif /* need at least 3 */
2879 #endif /* need at least 2 */
2880   return val & ((1L << VALBITS) - 1);
2881 }
2882 \f
2883 #ifdef WRONG_NAME_INSQUE
2884
2885 insque (q,p)
2886      caddr_t q,p;
2887 {
2888   _insque (q,p);
2889 }
2890
2891 #endif
2892 \f
2893 #ifdef VMS
2894
2895 #ifdef getenv
2896 /* If any place else asks for the TERM variable,
2897    allow it to be overridden with the EMACS_TERM variable
2898    before attempting to translate the logical name TERM.  As a last
2899    resort, ask for VAX C's special idea of the TERM variable.  */
2900 #undef getenv
2901 char *
2902 sys_getenv (name)
2903      char *name;
2904 {
2905   register char *val;
2906   static char buf[256];
2907   static struct dsc$descriptor_s equiv
2908     = {sizeof (buf), DSC$K_DTYPE_T, DSC$K_CLASS_S, buf};
2909   static struct dsc$descriptor_s d_name
2910     = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0};
2911   short eqlen;
2912
2913   if (!strcmp (name, "TERM"))
2914     {
2915       val = (char *) getenv ("EMACS_TERM");
2916       if (val)
2917         return val;
2918     }
2919
2920   d_name.dsc$w_length = strlen (name);
2921   d_name.dsc$a_pointer = name;
2922   if (LIB$SYS_TRNLOG (&d_name, &eqlen, &equiv) == 1)
2923     {
2924       char *str = (char *) xmalloc (eqlen + 1);
2925       bcopy (buf, str, eqlen);
2926       str[eqlen] = '\0';
2927       /* This is a storage leak, but a pain to fix.  With luck,
2928          no one will ever notice.  */
2929       return str;
2930     }
2931   return (char *) getenv (name);
2932 }
2933 #endif /* getenv */
2934
2935 #ifdef abort
2936 /* Since VMS doesn't believe in core dumps, the only way to debug this beast is
2937    to force a call on the debugger from within the image. */
2938 #undef abort
2939 sys_abort ()
2940 {
2941   reset_sys_modes ();
2942   LIB$SIGNAL (SS$_DEBUG);
2943 }
2944 #endif /* abort */
2945 #endif /* VMS */
2946 \f
2947 #ifdef VMS
2948 #ifdef LINK_CRTL_SHARE
2949 #ifdef SHARABLE_LIB_BUG
2950 /* Variables declared noshare and initialized in sharable libraries
2951    cannot be shared.  The VMS linker incorrectly forces you to use a private
2952    version which is uninitialized... If not for this "feature", we
2953    could use the C library definition of sys_nerr and sys_errlist. */
2954 int sys_nerr = 35;
2955 char *sys_errlist[] =
2956   {
2957     "error 0",
2958     "not owner",
2959     "no such file or directory",
2960     "no such process",
2961     "interrupted system call",
2962     "i/o error",
2963     "no such device or address",
2964     "argument list too long",
2965     "exec format error",
2966     "bad file number",
2967     "no child process",
2968     "no more processes",
2969     "not enough memory",
2970     "permission denied",
2971     "bad address",
2972     "block device required",
2973     "mount devices busy",
2974     "file exists",
2975     "cross-device link",
2976     "no such device",
2977     "not a directory",
2978     "is a directory",
2979     "invalid argument",
2980     "file table overflow",
2981     "too many open files",
2982     "not a typewriter",
2983     "text file busy",
2984     "file too big",
2985     "no space left on device",
2986     "illegal seek",
2987     "read-only file system",
2988     "too many links",
2989     "broken pipe",
2990     "math argument",
2991     "result too large",
2992     "I/O stream empty",
2993     "vax/vms specific error code nontranslatable error"
2994   };
2995 #endif /* SHARABLE_LIB_BUG */
2996 #endif /* LINK_CRTL_SHARE */
2997 #endif /* VMS */
2998
2999 #ifndef HAVE_STRERROR
3000 #ifndef WINDOWSNT
3001 char *
3002 strerror (errnum)
3003      int errnum;
3004 {
3005   extern char *sys_errlist[];
3006   extern int sys_nerr;
3007
3008   if (errnum >= 0 && errnum < sys_nerr)
3009     return sys_errlist[errnum];
3010   return (char *) "Unknown error";
3011 }
3012 #endif /* not WINDOWSNT */
3013 #endif /* ! HAVE_STRERROR */
3014 \f
3015 #ifdef INTERRUPTIBLE_OPEN
3016
3017 int
3018 /* VARARGS 2 */
3019 sys_open (path, oflag, mode)
3020      char *path;
3021      int oflag, mode;
3022 {
3023   register int rtnval;
3024
3025   while ((rtnval = open (path, oflag, mode)) == -1
3026          && (errno == EINTR));
3027   return (rtnval);
3028 }
3029
3030 #endif /* INTERRUPTIBLE_OPEN */
3031
3032 #ifdef INTERRUPTIBLE_CLOSE
3033
3034 sys_close (fd)
3035      int fd;
3036 {
3037   int did_retry = 0;
3038   register int rtnval;
3039
3040   while ((rtnval = close (fd)) == -1
3041          && (errno == EINTR))
3042     did_retry = 1;
3043
3044   /* If close is interrupted SunOS 4.1 may or may not have closed the
3045      file descriptor.  If it did the second close will fail with
3046      errno = EBADF.  That means we have succeeded.  */
3047   if (rtnval == -1 && did_retry && errno == EBADF)
3048     return 0;
3049
3050   return rtnval;
3051 }
3052
3053 #endif /* INTERRUPTIBLE_CLOSE */
3054
3055 #ifdef INTERRUPTIBLE_IO
3056
3057 int
3058 sys_read (fildes, buf, nbyte)
3059      int fildes;
3060      char *buf;
3061      unsigned int nbyte;
3062 {
3063   register int rtnval;
3064
3065   while ((rtnval = read (fildes, buf, nbyte)) == -1
3066          && (errno == EINTR));
3067   return (rtnval);
3068 }
3069
3070 int
3071 sys_write (fildes, buf, nbyte)
3072      int fildes;
3073      char *buf;
3074      unsigned int nbyte;
3075 {
3076   register int rtnval, bytes_written;
3077
3078   bytes_written = 0;
3079
3080   while (nbyte > 0)
3081     {
3082       rtnval = write (fildes, buf, nbyte);
3083
3084       if (rtnval == -1)
3085         {
3086           if (errno == EINTR)
3087             continue;
3088           else
3089             return (bytes_written ? bytes_written : -1);
3090         }
3091
3092       buf += rtnval;
3093       nbyte -= rtnval;
3094       bytes_written += rtnval;
3095     }
3096   return (bytes_written);
3097 }
3098
3099 #endif /* INTERRUPTIBLE_IO */
3100 \f
3101 #ifndef HAVE_VFORK
3102 #ifndef WINDOWSNT
3103 /*
3104  *      Substitute fork for vfork on USG flavors.
3105  */
3106
3107 VFORK_RETURN_TYPE
3108 vfork ()
3109 {
3110   return (fork ());
3111 }
3112 #endif /* not WINDOWSNT */
3113 #endif /* not HAVE_VFORK */
3114 \f
3115 #ifdef USG
3116 /*
3117  *      All of the following are for USG.
3118  *
3119  *      On USG systems the system calls are INTERRUPTIBLE by signals
3120  *      that the user program has elected to catch.  Thus the system call
3121  *      must be retried in these cases.  To handle this without massive
3122  *      changes in the source code, we remap the standard system call names
3123  *      to names for our own functions in sysdep.c that do the system call
3124  *      with retries.  Actually, for portability reasons, it is good
3125  *      programming practice, as this example shows, to limit all actual
3126  *      system calls to a single occurrence in the source.  Sure, this
3127  *      adds an extra level of function call overhead but it is almost
3128  *      always negligible.   Fred Fish, Unisoft Systems Inc.
3129  */
3130
3131 #ifndef HAVE_SYS_SIGLIST
3132 char *sys_siglist[NSIG + 1] =
3133 {
3134 #ifdef AIX
3135 /* AIX has changed the signals a bit */
3136   "bogus signal",                       /* 0 */
3137   "hangup",                             /* 1  SIGHUP */
3138   "interrupt",                          /* 2  SIGINT */
3139   "quit",                               /* 3  SIGQUIT */
3140   "illegal instruction",                /* 4  SIGILL */
3141   "trace trap",                         /* 5  SIGTRAP */
3142   "IOT instruction",                    /* 6  SIGIOT */
3143   "crash likely",                       /* 7  SIGDANGER */
3144   "floating point exception",           /* 8  SIGFPE */
3145   "kill",                               /* 9  SIGKILL */
3146   "bus error",                          /* 10 SIGBUS */
3147   "segmentation violation",             /* 11 SIGSEGV */
3148   "bad argument to system call",        /* 12 SIGSYS */
3149   "write on a pipe with no one to read it", /* 13 SIGPIPE */
3150   "alarm clock",                        /* 14 SIGALRM */
3151   "software termination signum",        /* 15 SIGTERM */
3152   "user defined signal 1",              /* 16 SIGUSR1 */
3153   "user defined signal 2",              /* 17 SIGUSR2 */
3154   "death of a child",                   /* 18 SIGCLD */
3155   "power-fail restart",                 /* 19 SIGPWR */
3156   "bogus signal",                       /* 20 */
3157   "bogus signal",                       /* 21 */
3158   "bogus signal",                       /* 22 */
3159   "bogus signal",                       /* 23 */
3160   "bogus signal",                       /* 24 */
3161   "LAN I/O interrupt",                  /* 25 SIGAIO */
3162   "PTY I/O interrupt",                  /* 26 SIGPTY */
3163   "I/O intervention required",          /* 27 SIGIOINT */
3164 #ifdef AIXHFT
3165   "HFT grant",                          /* 28 SIGGRANT */
3166   "HFT retract",                        /* 29 SIGRETRACT */
3167   "HFT sound done",                     /* 30 SIGSOUND */
3168   "HFT input ready",                    /* 31 SIGMSG */
3169 #endif
3170 #else /* not AIX */
3171   "bogus signal",                       /* 0 */
3172   "hangup",                             /* 1  SIGHUP */
3173   "interrupt",                          /* 2  SIGINT */
3174   "quit",                               /* 3  SIGQUIT */
3175   "illegal instruction",                /* 4  SIGILL */
3176   "trace trap",                         /* 5  SIGTRAP */
3177   "IOT instruction",                    /* 6  SIGIOT */
3178   "EMT instruction",                    /* 7  SIGEMT */
3179   "floating point exception",           /* 8  SIGFPE */
3180   "kill",                               /* 9  SIGKILL */
3181   "bus error",                          /* 10 SIGBUS */
3182   "segmentation violation",             /* 11 SIGSEGV */
3183   "bad argument to system call",        /* 12 SIGSYS */
3184   "write on a pipe with no one to read it", /* 13 SIGPIPE */
3185   "alarm clock",                        /* 14 SIGALRM */
3186   "software termination signum",        /* 15 SIGTERM */
3187   "user defined signal 1",              /* 16 SIGUSR1 */
3188   "user defined signal 2",              /* 17 SIGUSR2 */
3189   "death of a child",                   /* 18 SIGCLD */
3190   "power-fail restart",                 /* 19 SIGPWR */
3191 #ifdef sun
3192   "window size change",                     /* 20 SIGWINCH */
3193   "urgent socket condition",                /* 21 SIGURG */
3194   "pollable event occurred",                /* 22 SIGPOLL */
3195   "stop (cannot be caught or ignored)", /*  23 SIGSTOP */
3196   "user stop requested from tty",           /* 24 SIGTSTP */
3197   "stopped process has been continued", /* 25 SIGCONT */
3198   "background tty read attempted",          /* 26 SIGTTIN */
3199   "background tty write attempted",    /* 27 SIGTTOU */
3200   "virtual timer expired",                  /* 28 SIGVTALRM */
3201   "profiling timer expired",                /* 29 SIGPROF */
3202   "exceeded cpu limit",                     /* 30 SIGXCPU */
3203   "exceeded file size limit",               /* 31 SIGXFSZ */
3204   "process's lwps are blocked",     /*  32 SIGWAITING */
3205   "special signal used by thread library", /* 33 SIGLWP */
3206 #ifdef SIGFREEZE
3207   "Special Signal Used By CPR",     /* 34 SIGFREEZE */
3208 #endif
3209 #ifdef SIGTHAW
3210   "Special Signal Used By CPR",     /* 35 SIGTHAW */
3211 #endif
3212 #endif /* sun */
3213 #endif /* not AIX */
3214   0
3215   };
3216 #endif /* HAVE_SYS_SIGLIST */
3217
3218 /*
3219  *      Warning, this function may not duplicate 4.2 action properly
3220  *      under error conditions.
3221  */
3222
3223 #ifndef MAXPATHLEN
3224 /* In 4.1, param.h fails to define this.  */
3225 #define MAXPATHLEN 1024
3226 #endif
3227
3228 #ifndef HAVE_GETWD
3229
3230 char *
3231 getwd (pathname)
3232      char *pathname;
3233 {
3234   char *npath, *spath;
3235   extern char *getcwd ();
3236
3237   BLOCK_INPUT;                  /* getcwd uses malloc */
3238   spath = npath = getcwd ((char *) 0, MAXPATHLEN);
3239   if (spath == 0)
3240     return spath;
3241   /* On Altos 3068, getcwd can return @hostname/dir, so discard
3242      up to first slash.  Should be harmless on other systems.  */
3243   while (*npath && *npath != '/')
3244     npath++;
3245   strcpy (pathname, npath);
3246   free (spath);                 /* getcwd uses malloc */
3247   UNBLOCK_INPUT;
3248   return pathname;
3249 }
3250
3251 #endif /* HAVE_GETWD */
3252
3253 /*
3254  *      Emulate rename using unlink/link.  Note that this is
3255  *      only partially correct.  Also, doesn't enforce restriction
3256  *      that files be of same type (regular->regular, dir->dir, etc).
3257  */
3258
3259 #ifndef HAVE_RENAME
3260
3261 rename (from, to)
3262      const char *from;
3263      const char *to;
3264 {
3265   if (access (from, 0) == 0)
3266     {
3267       unlink (to);
3268       if (link (from, to) == 0)
3269         if (unlink (from) == 0)
3270           return (0);
3271     }
3272   return (-1);
3273 }
3274
3275 #endif
3276
3277
3278 #ifdef HPUX
3279 #ifndef HAVE_PERROR
3280
3281 /* HPUX curses library references perror, but as far as we know
3282    it won't be called.  Anyway this definition will do for now.  */
3283
3284 perror ()
3285 {
3286 }
3287
3288 #endif /* not HAVE_PERROR */
3289 #endif /* HPUX */
3290
3291 #ifndef HAVE_DUP2
3292
3293 /*
3294  *      Emulate BSD dup2.  First close newd if it already exists.
3295  *      Then, attempt to dup oldd.  If not successful, call dup2 recursively
3296  *      until we are, then close the unsuccessful ones.
3297  */
3298
3299 dup2 (oldd, newd)
3300      int oldd;
3301      int newd;
3302 {
3303   register int fd, ret;
3304
3305   sys_close (newd);
3306
3307 #ifdef F_DUPFD
3308   fd = fcntl (oldd, F_DUPFD, newd);
3309   if (fd != newd)
3310     error ("can't dup2 (%i,%i) : %s", oldd, newd, strerror (errno));
3311 #else
3312   fd = dup (old);
3313   if (fd == -1)
3314     return -1;
3315   if (fd == new)
3316     return new;
3317   ret = dup2 (old,new);
3318   sys_close (fd);
3319   return ret;
3320 #endif
3321 }
3322
3323 #endif /* not HAVE_DUP2 */
3324
3325 /*
3326  *      Gettimeofday.  Simulate as much as possible.  Only accurate
3327  *      to nearest second.  Emacs doesn't use tzp so ignore it for now.
3328  *      Only needed when subprocesses are defined.
3329  */
3330
3331 #ifdef subprocesses
3332 #ifndef VMS
3333 #ifndef HAVE_GETTIMEOFDAY
3334 #ifdef HAVE_TIMEVAL
3335
3336 /* ARGSUSED */
3337 gettimeofday (tp, tzp)
3338      struct timeval *tp;
3339      struct timezone *tzp;
3340 {
3341   extern long time ();
3342
3343   tp->tv_sec = time ((long *)0);
3344   tp->tv_usec = 0;
3345   if (tzp != 0)
3346     tzp->tz_minuteswest = -1;
3347 }
3348
3349 #endif
3350 #endif
3351 #endif
3352 #endif /* subprocess && !HAVE_GETTIMEOFDAY && HAVE_TIMEVAL && !VMS */
3353
3354 /*
3355  *      This function will go away as soon as all the stubs fixed. (fnf)
3356  */
3357
3358 croak (badfunc)
3359      char *badfunc;
3360 {
3361   printf ("%s not yet implemented\r\n", badfunc);
3362   reset_sys_modes ();
3363   exit (1);
3364 }
3365
3366 #endif /* USG */
3367 \f
3368 #ifdef DGUX
3369
3370 char *sys_siglist[NSIG + 1] =
3371 {
3372   "null signal",                         /*  0 SIGNULL   */
3373   "hangup",                              /*  1 SIGHUP    */
3374   "interrupt",                           /*  2 SIGINT    */
3375   "quit",                                /*  3 SIGQUIT   */
3376   "illegal instruction",                 /*  4 SIGILL    */
3377   "trace trap",                          /*  5 SIGTRAP   */
3378   "abort termination",                   /*  6 SIGABRT   */
3379   "SIGEMT",                              /*  7 SIGEMT    */
3380   "floating point exception",            /*  8 SIGFPE    */
3381   "kill",                                /*  9 SIGKILL   */
3382   "bus error",                           /* 10 SIGBUS    */
3383   "segmentation violation",              /* 11 SIGSEGV   */
3384   "bad argument to system call",         /* 12 SIGSYS    */
3385   "write on a pipe with no reader",      /* 13 SIGPIPE   */
3386   "alarm clock",                         /* 14 SIGALRM   */
3387   "software termination signal",         /* 15 SIGTERM   */
3388   "user defined signal 1",               /* 16 SIGUSR1   */
3389   "user defined signal 2",               /* 17 SIGUSR2   */
3390   "child stopped or terminated",         /* 18 SIGCLD    */
3391   "power-fail restart",                  /* 19 SIGPWR    */
3392   "window size changed",                 /* 20 SIGWINCH  */
3393   "undefined",                           /* 21           */
3394   "pollable event occurred",             /* 22 SIGPOLL   */
3395   "sendable stop signal not from tty",   /* 23 SIGSTOP   */
3396   "stop signal from tty",                /* 24 SIGSTP    */
3397   "continue a stopped process",          /* 25 SIGCONT   */
3398   "attempted background tty read",       /* 26 SIGTTIN   */
3399   "attempted background tty write",      /* 27 SIGTTOU   */
3400   "undefined",                           /* 28           */
3401   "undefined",                           /* 29           */
3402   "undefined",                           /* 30           */
3403   "undefined",                           /* 31           */
3404   "undefined",                           /* 32           */
3405   "socket (TCP/IP) urgent data arrival", /* 33 SIGURG    */
3406   "I/O is possible",                     /* 34 SIGIO     */
3407   "exceeded cpu time limit",             /* 35 SIGXCPU   */
3408   "exceeded file size limit",            /* 36 SIGXFSZ   */
3409   "virtual time alarm",                  /* 37 SIGVTALRM */
3410   "profiling time alarm",                /* 38 SIGPROF   */
3411   "undefined",                           /* 39           */
3412   "file record locks revoked",           /* 40 SIGLOST   */
3413   "undefined",                           /* 41           */
3414   "undefined",                           /* 42           */
3415   "undefined",                           /* 43           */
3416   "undefined",                           /* 44           */
3417   "undefined",                           /* 45           */
3418   "undefined",                           /* 46           */
3419   "undefined",                           /* 47           */
3420   "undefined",                           /* 48           */
3421   "undefined",                           /* 49           */
3422   "undefined",                           /* 50           */
3423   "undefined",                           /* 51           */
3424   "undefined",                           /* 52           */
3425   "undefined",                           /* 53           */
3426   "undefined",                           /* 54           */
3427   "undefined",                           /* 55           */
3428   "undefined",                           /* 56           */
3429   "undefined",                           /* 57           */
3430   "undefined",                           /* 58           */
3431   "undefined",                           /* 59           */
3432   "undefined",                           /* 60           */
3433   "undefined",                           /* 61           */
3434   "undefined",                           /* 62           */
3435   "undefined",                           /* 63           */
3436   "notification message in mess. queue", /* 64 SIGDGNOTIFY */
3437   0
3438 };
3439
3440 #endif /* DGUX */
3441 \f
3442 /* Directory routines for systems that don't have them. */
3443
3444 #ifdef SYSV_SYSTEM_DIR
3445
3446 #include <dirent.h>
3447
3448 #if defined(BROKEN_CLOSEDIR) || !defined(HAVE_CLOSEDIR)
3449
3450 int
3451 closedir (dirp)
3452      register DIR *dirp;              /* stream from opendir */
3453 {
3454   int rtnval;
3455
3456   rtnval = sys_close (dirp->dd_fd);
3457
3458   /* Some systems (like Solaris) allocate the buffer and the DIR all
3459      in one block.  Why in the world are we freeing this ourselves
3460      anyway?  */
3461 #if ! (defined (sun) && defined (USG5_4))
3462   xfree ((char *) dirp->dd_buf); /* directory block defined in <dirent.h> */
3463 #endif
3464   xfree ((char *) dirp);
3465
3466   return rtnval;
3467 }
3468 #endif /* BROKEN_CLOSEDIR or not HAVE_CLOSEDIR */
3469 #endif /* SYSV_SYSTEM_DIR */
3470
3471 #ifdef NONSYSTEM_DIR_LIBRARY
3472
3473 DIR *
3474 opendir (filename)
3475      char *filename;    /* name of directory */
3476 {
3477   register DIR *dirp;           /* -> malloc'ed storage */
3478   register int fd;              /* file descriptor for read */
3479   struct stat sbuf;             /* result of fstat */
3480
3481   fd = sys_open (filename, 0);
3482   if (fd < 0)
3483     return 0;
3484
3485   BLOCK_INPUT;
3486   if (fstat (fd, &sbuf) < 0
3487       || (sbuf.st_mode & S_IFMT) != S_IFDIR
3488       || (dirp = (DIR *) malloc (sizeof (DIR))) == 0)
3489     {
3490       sys_close (fd);
3491       UNBLOCK_INPUT;
3492       return 0;         /* bad luck today */
3493     }
3494   UNBLOCK_INPUT;
3495
3496   dirp->dd_fd = fd;
3497   dirp->dd_loc = dirp->dd_size = 0;     /* refill needed */
3498
3499   return dirp;
3500 }
3501
3502 void
3503 closedir (dirp)
3504      register DIR *dirp;                /* stream from opendir */
3505 {
3506   sys_close (dirp->dd_fd);
3507   xfree ((char *) dirp);
3508 }
3509
3510
3511 #ifndef VMS
3512 #define DIRSIZ  14
3513 struct olddir
3514   {
3515     ino_t od_ino;               /* inode */
3516     char od_name[DIRSIZ];       /* filename */
3517   };
3518 #endif /* not VMS */
3519
3520 struct direct dir_static;       /* simulated directory contents */
3521
3522 /* ARGUSED */
3523 struct direct *
3524 readdir (dirp)
3525      register DIR *dirp;        /* stream from opendir */
3526 {
3527 #ifndef VMS
3528   register struct olddir *dp;   /* -> directory data */
3529 #else /* VMS */
3530   register struct dir$_name *dp; /* -> directory data */
3531   register struct dir$_version *dv; /* -> version data */
3532 #endif /* VMS */
3533
3534   for (; ;)
3535     {
3536       if (dirp->dd_loc >= dirp->dd_size)
3537         dirp->dd_loc = dirp->dd_size = 0;
3538
3539       if (dirp->dd_size == 0    /* refill buffer */
3540           && (dirp->dd_size = sys_read (dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ)) <= 0)
3541         return 0;
3542
3543 #ifndef VMS
3544       dp = (struct olddir *) &dirp->dd_buf[dirp->dd_loc];
3545       dirp->dd_loc += sizeof (struct olddir);
3546
3547       if (dp->od_ino != 0)      /* not deleted entry */
3548         {
3549           dir_static.d_ino = dp->od_ino;
3550           strncpy (dir_static.d_name, dp->od_name, DIRSIZ);
3551           dir_static.d_name[DIRSIZ] = '\0';
3552           dir_static.d_namlen = strlen (dir_static.d_name);
3553           dir_static.d_reclen = sizeof (struct direct)
3554             - MAXNAMLEN + 3
3555               + dir_static.d_namlen - dir_static.d_namlen % 4;
3556           return &dir_static;   /* -> simulated structure */
3557         }
3558 #else /* VMS */
3559       dp = (struct dir$_name *) dirp->dd_buf;
3560       if (dirp->dd_loc == 0)
3561         dirp->dd_loc = (dp->dir$b_namecount&1) ? dp->dir$b_namecount + 1
3562           : dp->dir$b_namecount;
3563       dv = (struct dir$_version *)&dp->dir$t_name[dirp->dd_loc];
3564       dir_static.d_ino = dv->dir$w_fid_num;
3565       dir_static.d_namlen = dp->dir$b_namecount;
3566       dir_static.d_reclen = sizeof (struct direct)
3567         - MAXNAMLEN + 3
3568           + dir_static.d_namlen - dir_static.d_namlen % 4;
3569       strncpy (dir_static.d_name, dp->dir$t_name, dp->dir$b_namecount);
3570       dir_static.d_name[dir_static.d_namlen] = '\0';
3571       dirp->dd_loc = dirp->dd_size; /* only one record at a time */
3572       return &dir_static;
3573 #endif /* VMS */
3574     }
3575 }
3576
3577 #ifdef VMS
3578 /* readdirver is just like readdir except it returns all versions of a file
3579    as separate entries.  */
3580
3581 /* ARGUSED */
3582 struct direct *
3583 readdirver (dirp)
3584      register DIR *dirp;        /* stream from opendir */
3585 {
3586   register struct dir$_name *dp; /* -> directory data */
3587   register struct dir$_version *dv; /* -> version data */
3588
3589   if (dirp->dd_loc >= dirp->dd_size - sizeof (struct dir$_name))
3590     dirp->dd_loc = dirp->dd_size = 0;
3591
3592   if (dirp->dd_size == 0        /* refill buffer */
3593       && (dirp->dd_size = sys_read (dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ)) <= 0)
3594     return 0;
3595
3596   dp = (struct dir$_name *) dirp->dd_buf;
3597   if (dirp->dd_loc == 0)
3598     dirp->dd_loc = (dp->dir$b_namecount & 1) ? dp->dir$b_namecount + 1
3599                    : dp->dir$b_namecount;
3600   dv = (struct dir$_version *) &dp->dir$t_name[dirp->dd_loc];
3601   strncpy (dir_static.d_name, dp->dir$t_name, dp->dir$b_namecount);
3602   sprintf (&dir_static.d_name[dp->dir$b_namecount], ";%d", dv->dir$w_version);
3603   dir_static.d_namlen = strlen (dir_static.d_name);
3604   dir_static.d_ino = dv->dir$w_fid_num;
3605   dir_static.d_reclen = sizeof (struct direct) - MAXNAMLEN + 3
3606                         + dir_static.d_namlen - dir_static.d_namlen % 4;
3607   dirp->dd_loc = ((char *) (++dv) - dp->dir$t_name);
3608   return &dir_static;
3609 }
3610
3611 #endif /* VMS */
3612
3613 #endif /* NONSYSTEM_DIR_LIBRARY */
3614
3615 \f
3616 int
3617 set_file_times (filename, atime, mtime)
3618      char *filename;
3619      EMACS_TIME atime, mtime;
3620 {
3621 #ifdef HAVE_UTIMES
3622   struct timeval tv[2];
3623   tv[0] = atime;
3624   tv[1] = mtime;
3625   return utimes (filename, tv);
3626 #else /* not HAVE_UTIMES */
3627   struct utimbuf utb;
3628   utb.actime = EMACS_SECS (atime);
3629   utb.modtime = EMACS_SECS (mtime);
3630   return utime (filename, &utb);
3631 #endif /* not HAVE_UTIMES */
3632 }
3633 \f
3634 /* mkdir and rmdir functions, for systems which don't have them.  */
3635
3636 #ifndef HAVE_MKDIR
3637 /*
3638  * Written by Robert Rother, Mariah Corporation, August 1985.
3639  *
3640  * If you want it, it's yours.  All I ask in return is that if you
3641  * figure out how to do this in a Bourne Shell script you send me
3642  * a copy.
3643  *                                      sdcsvax!rmr or rmr@uscd
3644  *
3645  * Severely hacked over by John Gilmore to make a 4.2BSD compatible
3646  * subroutine.  11Mar86; hoptoad!gnu
3647  *
3648  * Modified by rmtodd@uokmax 6-28-87 -- when making an already existing dir,
3649  * subroutine didn't return EEXIST.  It does now.
3650  */
3651
3652 /*
3653  * Make a directory.
3654  */
3655 #ifdef MKDIR_PROTOTYPE
3656 MKDIR_PROTOTYPE
3657 #else
3658 int
3659 mkdir (dpath, dmode)
3660      char *dpath;
3661      int dmode;
3662 #endif
3663 {
3664   int cpid, status, fd;
3665   struct stat statbuf;
3666
3667   if (stat (dpath, &statbuf) == 0)
3668     {
3669       errno = EEXIST;           /* Stat worked, so it already exists */
3670       return -1;
3671     }
3672
3673   /* If stat fails for a reason other than non-existence, return error */
3674   if (errno != ENOENT)
3675     return -1;
3676
3677   synch_process_alive = 1;
3678   switch (cpid = fork ())
3679     {
3680
3681     case -1:                    /* Error in fork */
3682       return (-1);              /* Errno is set already */
3683
3684     case 0:                     /* Child process */
3685       /*
3686                  * Cheap hack to set mode of new directory.  Since this
3687                  * child process is going away anyway, we zap its umask.
3688                  * FIXME, this won't suffice to set SUID, SGID, etc. on this
3689                  * directory.  Does anybody care?
3690                  */
3691       status = umask (0);       /* Get current umask */
3692       status = umask (status | (0777 & ~dmode));        /* Set for mkdir */
3693       fd = sys_open("/dev/null", 2);
3694       if (fd >= 0)
3695         {
3696           dup2 (fd, 0);
3697           dup2 (fd, 1);
3698           dup2 (fd, 2);
3699         }
3700       execl ("/bin/mkdir", "mkdir", dpath, (char *) 0);
3701       _exit (-1);               /* Can't exec /bin/mkdir */
3702
3703     default:                    /* Parent process */
3704       wait_for_termination (cpid);
3705     }
3706
3707   if (synch_process_death != 0 || synch_process_retcode != 0)
3708     {
3709       errno = EIO;              /* We don't know why, but */
3710       return -1;                /* /bin/mkdir failed */
3711     }
3712
3713   return 0;
3714 }
3715 #endif /* not HAVE_MKDIR */
3716
3717 #ifndef HAVE_RMDIR
3718 int
3719 rmdir (dpath)
3720      char *dpath;
3721 {
3722   int cpid, status, fd;
3723   struct stat statbuf;
3724
3725   if (stat (dpath, &statbuf) != 0)
3726     {
3727       /* Stat just set errno.  We don't have to */
3728       return -1;
3729     }
3730
3731   synch_process_alive = 1;
3732   switch (cpid = fork ())
3733     {
3734
3735     case -1:                    /* Error in fork */
3736       return (-1);              /* Errno is set already */
3737
3738     case 0:                     /* Child process */
3739       fd = sys_open("/dev/null", 2);
3740       if (fd >= 0)
3741         {
3742           dup2 (fd, 0);
3743           dup2 (fd, 1);
3744           dup2 (fd, 2);
3745         }
3746       execl ("/bin/rmdir", "rmdir", dpath, (char *) 0);
3747       _exit (-1);               /* Can't exec /bin/rmdir */
3748
3749     default:                    /* Parent process */
3750       wait_for_termination (cpid);
3751     }
3752
3753   if (synch_process_death != 0 || synch_process_retcode != 0)
3754     {
3755       errno = EIO;              /* We don't know why, but */
3756       return -1;                /* /bin/rmdir failed */
3757     }
3758
3759   return 0;
3760 }
3761 #endif /* !HAVE_RMDIR */
3762
3763
3764 \f
3765 /* Functions for VMS */
3766 #ifdef VMS
3767 #include "vms-pwd.h"
3768 #include <acldef.h>
3769 #include <chpdef.h>
3770 #include <jpidef.h>
3771
3772 /* Return as a string the VMS error string pertaining to STATUS.
3773    Reuses the same static buffer each time it is called.  */
3774
3775 char *
3776 vmserrstr (status)
3777      int status;                /* VMS status code */
3778 {
3779   int bufadr[2];
3780   short len;
3781   static char buf[257];
3782
3783   bufadr[0] = sizeof buf - 1;
3784   bufadr[1] = (int) buf;
3785   if (! (SYS$GETMSG (status, &len, bufadr, 0x1, 0) & 1))
3786     return "untranslatable VMS error status";
3787   buf[len] = '\0';
3788   return buf;
3789 }
3790
3791 #ifdef access
3792 #undef access
3793
3794 /* The following is necessary because 'access' emulation by VMS C (2.0) does
3795  * not work correctly.  (It also doesn't work well in version 2.3.)
3796  */
3797
3798 #ifdef VMS4_4
3799
3800 #define DESCRIPTOR(name,string) struct dsc$descriptor_s name = \
3801         { strlen (string), DSC$K_DTYPE_T, DSC$K_CLASS_S, string }
3802
3803 typedef union {
3804     struct {
3805         unsigned short s_buflen;
3806         unsigned short s_code;
3807         char *s_bufadr;
3808         unsigned short *s_retlenadr;
3809     } s;
3810     int end;
3811 } item;
3812 #define buflen s.s_buflen
3813 #define code s.s_code
3814 #define bufadr s.s_bufadr
3815 #define retlenadr s.s_retlenadr
3816
3817 #define R_OK 4  /* test for read permission */
3818 #define W_OK 2  /* test for write permission */
3819 #define X_OK 1  /* test for execute (search) permission */
3820 #define F_OK 0  /* test for presence of file */
3821
3822 int
3823 sys_access (path, mode)
3824      char *path;
3825      int mode;
3826 {
3827   static char *user = NULL;
3828   char dir_fn[512];
3829
3830   /* translate possible directory spec into .DIR file name, so brain-dead
3831    * access can treat the directory like a file.  */
3832   if (directory_file_name (path, dir_fn))
3833     path = dir_fn;
3834
3835   if (mode == F_OK)
3836     return access (path, mode);
3837   if (user == NULL && (user = (char *) getenv ("USER")) == NULL)
3838     return -1;
3839   {
3840     int stat;
3841     int flags;
3842     int acces;
3843     unsigned short int dummy;
3844     item itemlst[3];
3845     static int constant = ACL$C_FILE;
3846     DESCRIPTOR (path_desc, path);
3847     DESCRIPTOR (user_desc, user);
3848
3849     flags = 0;
3850     acces = 0;
3851     if ((mode & X_OK) && ((stat = access (path, mode)) < 0 || mode == X_OK))
3852       return stat;
3853     if (mode & R_OK)
3854       acces |= CHP$M_READ;
3855     if (mode & W_OK)
3856       acces |= CHP$M_WRITE;
3857     itemlst[0].buflen = sizeof (int);
3858     itemlst[0].code = CHP$_FLAGS;
3859     itemlst[0].bufadr = (char *) &flags;
3860     itemlst[0].retlenadr = &dummy;
3861     itemlst[1].buflen = sizeof (int);
3862     itemlst[1].code = CHP$_ACCESS;
3863     itemlst[1].bufadr = (char *) &acces;
3864     itemlst[1].retlenadr = &dummy;
3865     itemlst[2].end = CHP$_END;
3866     stat = SYS$CHECK_ACCESS (&constant, &path_desc, &user_desc, itemlst);
3867     return stat == SS$_NORMAL ? 0 : -1;
3868   }
3869 }
3870
3871 #else /* not VMS4_4 */
3872
3873 #include <prvdef.h>
3874 #define ACE$M_WRITE     2
3875 #define ACE$C_KEYID     1
3876
3877 static unsigned short memid, grpid;
3878 static unsigned int uic;
3879
3880 /* Called from init_sys_modes, so it happens not very often
3881    but at least each time Emacs is loaded.  */
3882 sys_access_reinit ()
3883 {
3884   uic = 0;
3885 }
3886
3887 int
3888 sys_access (filename, type)
3889      char * filename;
3890      int type;
3891 {
3892   struct FAB fab;
3893   struct XABPRO xab;
3894   int status, size, i, typecode, acl_controlled;
3895   unsigned int *aclptr, *aclend, aclbuf[60];
3896   union prvdef prvmask;
3897
3898   /* Get UIC and GRP values for protection checking.  */
3899   if (uic == 0)
3900     {
3901       status = LIB$GETJPI (&JPI$_UIC, 0, 0, &uic, 0, 0);
3902       if (! (status & 1))
3903         return -1;
3904       memid = uic & 0xFFFF;
3905       grpid = uic >> 16;
3906     }
3907
3908   if (type != 2)                /* not checking write access */
3909     return access (filename, type);
3910
3911   /* Check write protection. */
3912
3913 #define CHECKPRIV(bit)    (prvmask.bit)
3914 #define WRITABLE(field)  (! ((xab.xab$w_pro >> field) & XAB$M_NOWRITE))
3915
3916   /* Find privilege bits */
3917   status = SYS$SETPRV (0, 0, 0, prvmask);
3918   if (! (status & 1))
3919     error ("Unable to find privileges: %s", vmserrstr (status));
3920   if (CHECKPRIV (PRV$V_BYPASS))
3921     return 0;                   /* BYPASS enabled */
3922   fab = cc$rms_fab;
3923   fab.fab$b_fac = FAB$M_GET;
3924   fab.fab$l_fna = filename;
3925   fab.fab$b_fns = strlen (filename);
3926   fab.fab$l_xab = &xab;
3927   xab = cc$rms_xabpro;
3928   xab.xab$l_aclbuf = aclbuf;
3929   xab.xab$w_aclsiz = sizeof (aclbuf);
3930   status = SYS$OPEN (&fab, 0, 0);
3931   if (! (status & 1))
3932     return -1;
3933   SYS$CLOSE (&fab, 0, 0);
3934   /* Check system access */
3935   if (CHECKPRIV (PRV$V_SYSPRV) && WRITABLE (XAB$V_SYS))
3936     return 0;
3937   /* Check ACL entries, if any */
3938   acl_controlled = 0;
3939   if (xab.xab$w_acllen > 0)
3940     {
3941       aclptr = aclbuf;
3942       aclend = &aclbuf[xab.xab$w_acllen / 4];
3943       while (*aclptr && aclptr < aclend)
3944         {
3945           size = (*aclptr & 0xff) / 4;
3946           typecode = (*aclptr >> 8) & 0xff;
3947           if (typecode == ACE$C_KEYID)
3948             for (i = size - 1; i > 1; i--)
3949               if (aclptr[i] == uic)
3950                 {
3951                   acl_controlled = 1;
3952                   if (aclptr[1] & ACE$M_WRITE)
3953                     return 0;   /* Write access through ACL */
3954                 }
3955           aclptr = &aclptr[size];
3956         }
3957       if (acl_controlled)       /* ACL specified, prohibits write access */
3958         return -1;
3959     }
3960   /* No ACL entries specified, check normal protection */
3961   if (WRITABLE (XAB$V_WLD))     /* World writable */
3962     return 0;
3963   if (WRITABLE (XAB$V_GRP) &&
3964       (unsigned short) (xab.xab$l_uic >> 16) == grpid)
3965     return 0;                   /* Group writable */
3966   if (WRITABLE (XAB$V_OWN) &&
3967       (xab.xab$l_uic & 0xFFFF) == memid)
3968     return 0;                   /* Owner writable */
3969
3970   return -1;    /* Not writable */
3971 }
3972 #endif /* not VMS4_4 */
3973 #endif /* access */
3974
3975 static char vtbuf[NAM$C_MAXRSS+1];
3976
3977 /* translate a vms file spec to a unix path */
3978 char *
3979 sys_translate_vms (vfile)
3980      char * vfile;
3981 {
3982   char * p;
3983   char * targ;
3984
3985   if (!vfile)
3986     return 0;
3987
3988   targ = vtbuf;
3989
3990   /* leading device or logical name is a root directory */
3991   if (p = strchr (vfile, ':'))
3992     {
3993       *targ++ = '/';
3994       while (vfile < p)
3995         *targ++ = *vfile++;
3996       vfile++;
3997       *targ++ = '/';
3998     }
3999   p = vfile;
4000   if (*p == '[' || *p == '<')
4001     {
4002       while (*++vfile != *p + 2)
4003         switch (*vfile)
4004           {
4005           case '.':
4006             if (vfile[-1] == *p)
4007               *targ++ = '.';
4008             *targ++ = '/';
4009             break;
4010
4011           case '-':
4012             *targ++ = '.';
4013             *targ++ = '.';
4014             break;
4015
4016           default:
4017             *targ++ = *vfile;
4018             break;
4019           }
4020       vfile++;
4021       *targ++ = '/';
4022     }
4023   while (*vfile)
4024     *targ++ = *vfile++;
4025
4026   return vtbuf;
4027 }
4028
4029 static char utbuf[NAM$C_MAXRSS+1];
4030
4031 /* translate a unix path to a VMS file spec */
4032 char *
4033 sys_translate_unix (ufile)
4034      char * ufile;
4035 {
4036   int slash_seen = 0;
4037   char *p;
4038   char * targ;
4039
4040   if (!ufile)
4041     return 0;
4042
4043   targ = utbuf;
4044
4045   if (*ufile == '/')
4046     {
4047       ufile++;
4048     }
4049
4050   while (*ufile)
4051     {
4052       switch (*ufile)
4053         {
4054         case '/':
4055           if (slash_seen)
4056             if (index (&ufile[1], '/'))
4057               *targ++ = '.';
4058             else
4059               *targ++ = ']';
4060           else
4061             {
4062               *targ++ = ':';
4063               if (index (&ufile[1], '/'))
4064                 *targ++ = '[';
4065               slash_seen = 1;
4066             }
4067           break;
4068
4069         case '.':
4070           if (strncmp (ufile, "./", 2) == 0)
4071             {
4072               if (!slash_seen)
4073                 {
4074                   *targ++ = '[';
4075                   slash_seen = 1;
4076                 }
4077               ufile++;          /* skip the dot */
4078               if (index (&ufile[1], '/'))
4079                 *targ++ = '.';
4080               else
4081                 *targ++ = ']';
4082             }
4083           else if (strncmp (ufile, "../", 3) == 0)
4084             {
4085               if (!slash_seen)
4086                 {
4087                   *targ++ = '[';
4088                   slash_seen = 1;
4089                 }
4090               *targ++ = '-';
4091               ufile += 2;       /* skip the dots */
4092               if (index (&ufile[1], '/'))
4093                 *targ++ = '.';
4094               else
4095                 *targ++ = ']';
4096             }
4097           else
4098             *targ++ = *ufile;
4099           break;
4100
4101         default:
4102           *targ++ = *ufile;
4103           break;
4104         }
4105       ufile++;
4106     }
4107   *targ = '\0';
4108
4109   return utbuf;
4110 }
4111
4112 char *
4113 getwd (pathname)
4114      char *pathname;
4115 {
4116   char *ptr, *val;
4117   extern char *getcwd ();
4118
4119 #define MAXPATHLEN 1024
4120
4121   ptr = xmalloc (MAXPATHLEN);
4122   val = getcwd (ptr, MAXPATHLEN);
4123   if (val == 0)
4124     {
4125       xfree (ptr);
4126       return val;
4127     }
4128   strcpy (pathname, ptr);
4129   xfree (ptr);
4130
4131  return pathname;
4132 }
4133
4134 getppid ()
4135 {
4136   long item_code = JPI$_OWNER;
4137   unsigned long parent_id;
4138   int status;
4139
4140   if (((status = LIB$GETJPI (&item_code, 0, 0, &parent_id)) & 1) == 0)
4141     {
4142       errno = EVMSERR;
4143       vaxc$errno = status;
4144       return -1;
4145     }
4146   return parent_id;
4147 }
4148
4149 #undef getuid
4150 unsigned
4151 sys_getuid ()
4152 {
4153   return (getgid () << 16) | getuid ();
4154 }
4155
4156 int
4157 sys_read (fildes, buf, nbyte)
4158      int fildes;
4159      char *buf;
4160      unsigned int nbyte;
4161 {
4162   return read (fildes, buf, (nbyte < MAXIOSIZE ? nbyte : MAXIOSIZE));
4163 }
4164
4165 #if 0
4166 int
4167 sys_write (fildes, buf, nbyte)
4168      int fildes;
4169      char *buf;
4170      unsigned int nbyte;
4171 {
4172   register int nwrote, rtnval = 0;
4173
4174   while (nbyte > MAXIOSIZE && (nwrote = write (fildes, buf, MAXIOSIZE)) > 0) {
4175     nbyte -= nwrote;
4176     buf += nwrote;
4177     rtnval += nwrote;
4178   }
4179   if (nwrote < 0)
4180     return rtnval ? rtnval : -1;
4181   if ((nwrote = write (fildes, buf, nbyte)) < 0)
4182     return rtnval ? rtnval : -1;
4183   return (rtnval + nwrote);
4184 }
4185 #endif /* 0 */
4186
4187 /*
4188  *      VAX/VMS VAX C RTL really loses. It insists that records
4189  *      end with a newline (carriage return) character, and if they
4190  *      don't it adds one (nice of it isn't it!)
4191  *
4192  *      Thus we do this stupidity below.
4193  */
4194
4195 int
4196 sys_write (fildes, buf, nbytes)
4197      int fildes;
4198      char *buf;
4199      unsigned int nbytes;
4200 {
4201   register char *p;
4202   register char *e;
4203   int sum = 0;
4204   struct stat st;
4205
4206   fstat (fildes, &st);
4207   p = buf;
4208   while (nbytes > 0)
4209     {
4210       int len, retval;
4211
4212       /* Handle fixed-length files with carriage control.  */
4213       if (st.st_fab_rfm == FAB$C_FIX
4214           && ((st.st_fab_rat & (FAB$M_FTN | FAB$M_CR)) != 0))
4215         {
4216           len = st.st_fab_mrs;
4217           retval = write (fildes, p, min (len, nbytes));
4218           if (retval != len)
4219             return -1;
4220           retval++;     /* This skips the implied carriage control */
4221         }
4222       else
4223         {
4224           e =  p + min (MAXIOSIZE, nbytes) - 1;
4225           while (*e != '\n' && e > p) e--;
4226           if (p == e)           /* Ok.. so here we add a newline... sigh. */
4227             e = p + min (MAXIOSIZE, nbytes) - 1;
4228           len = e + 1 - p;
4229           retval = write (fildes, p, len);
4230           if (retval != len)
4231             return -1;
4232         }
4233       p += retval;
4234       sum += retval;
4235       nbytes -= retval;
4236     }
4237   return sum;
4238 }
4239
4240 /* Create file NEW copying its attributes from file OLD.  If
4241    OLD is 0 or does not exist, create based on the value of
4242    vms_stmlf_recfm. */
4243
4244 /* Protection value the file should ultimately have.
4245    Set by create_copy_attrs, and use by rename_sansversions.  */
4246 static unsigned short int fab_final_pro;
4247
4248 int
4249 creat_copy_attrs (old, new)
4250      char *old, *new;
4251 {
4252   struct FAB fab = cc$rms_fab;
4253   struct XABPRO xabpro;
4254   char aclbuf[256];     /* Choice of size is arbitrary.  See below. */
4255   extern int vms_stmlf_recfm;
4256
4257   if (old)
4258     {
4259       fab.fab$b_fac = FAB$M_GET;
4260       fab.fab$l_fna = old;
4261       fab.fab$b_fns = strlen (old);
4262       fab.fab$l_xab = (char *) &xabpro;
4263       xabpro = cc$rms_xabpro;
4264       xabpro.xab$l_aclbuf = aclbuf;
4265       xabpro.xab$w_aclsiz = sizeof aclbuf;
4266       /* Call $OPEN to fill in the fab & xabpro fields. */
4267       if (SYS$OPEN (&fab, 0, 0) & 1)
4268         {
4269           SYS$CLOSE (&fab, 0, 0);
4270           fab.fab$l_alq = 0;    /* zero the allocation quantity */
4271           if (xabpro.xab$w_acllen > 0)
4272             {
4273               if (xabpro.xab$w_acllen > sizeof aclbuf)
4274                 /* If the acl buffer was too short, redo open with longer one.
4275                    Wouldn't need to do this if there were some system imposed
4276                    limit on the size of an ACL, but I can't find any such. */
4277                 {
4278                   xabpro.xab$l_aclbuf = (char *) alloca (xabpro.xab$w_acllen);
4279                   xabpro.xab$w_aclsiz = xabpro.xab$w_acllen;
4280                   if (SYS$OPEN (&fab, 0, 0) & 1)
4281                     SYS$CLOSE (&fab, 0, 0);
4282                   else
4283                     old = 0;
4284                 }
4285             }
4286           else
4287             xabpro.xab$l_aclbuf = 0;
4288         }
4289       else
4290         old = 0;
4291     }
4292   fab.fab$l_fna = new;
4293   fab.fab$b_fns = strlen (new);
4294   if (!old)
4295     {
4296       fab.fab$l_xab = 0;
4297       fab.fab$b_rfm = vms_stmlf_recfm ? FAB$C_STMLF : FAB$C_VAR;
4298       fab.fab$b_rat = FAB$M_CR;
4299     }
4300
4301   /* Set the file protections such that we will be able to manipulate
4302      this file.  Once we are done writing and renaming it, we will set
4303      the protections back.  */
4304   if (old)
4305     fab_final_pro = xabpro.xab$w_pro;
4306   else
4307     SYS$SETDFPROT (0, &fab_final_pro);
4308   xabpro.xab$w_pro &= 0xff0f; /* set O:rewd for now. This is set back later. */
4309
4310   /* Create the new file with either default attrs or attrs copied
4311      from old file. */
4312   if (!(SYS$CREATE (&fab, 0, 0) & 1))
4313     return -1;
4314   SYS$CLOSE (&fab, 0, 0);
4315   /* As this is a "replacement" for creat, return a file descriptor
4316      opened for writing. */
4317   return open (new, O_WRONLY);
4318 }
4319
4320 #ifdef creat
4321 #undef creat
4322 #include <varargs.h>
4323 #ifdef __GNUC__
4324 #ifndef va_count
4325 #define va_count(X) ((X) = *(((int *) &(va_alist)) - 1))
4326 #endif
4327 #endif
4328
4329 sys_creat (va_alist)
4330      va_dcl
4331 {
4332   va_list list_incrementer;
4333   char *name;
4334   int mode;
4335   int rfd;                      /* related file descriptor */
4336   int fd;                       /* Our new file descriptor */
4337   int count;
4338   struct stat st_buf;
4339   char rfm[12];
4340   char rat[15];
4341   char mrs[13];
4342   char fsz[13];
4343   extern int vms_stmlf_recfm;
4344
4345   va_count (count);
4346   va_start (list_incrementer);
4347   name = va_arg (list_incrementer, char *);
4348   mode = va_arg (list_incrementer, int);
4349   if (count > 2)
4350     rfd = va_arg (list_incrementer, int);
4351   va_end (list_incrementer);
4352   if (count > 2)
4353     {
4354       /* Use information from the related file descriptor to set record
4355          format of the newly created file. */
4356       fstat (rfd, &st_buf);
4357       switch (st_buf.st_fab_rfm)
4358         {
4359         case FAB$C_FIX:
4360           strcpy (rfm, "rfm = fix");
4361           sprintf (mrs, "mrs = %d", st_buf.st_fab_mrs);
4362           strcpy (rat, "rat = ");
4363           if (st_buf.st_fab_rat & FAB$M_CR)
4364             strcat (rat, "cr");
4365           else if (st_buf.st_fab_rat & FAB$M_FTN)
4366             strcat (rat, "ftn");
4367           else if (st_buf.st_fab_rat & FAB$M_PRN)
4368             strcat (rat, "prn");
4369           if (st_buf.st_fab_rat & FAB$M_BLK)
4370             if (st_buf.st_fab_rat & (FAB$M_CR|FAB$M_FTN|FAB$M_PRN))
4371               strcat (rat, ", blk");
4372             else
4373               strcat (rat, "blk");
4374           return creat (name, 0, rfm, rat, mrs);
4375
4376         case FAB$C_VFC:
4377           strcpy (rfm, "rfm = vfc");
4378           sprintf (fsz, "fsz = %d", st_buf.st_fab_fsz);
4379           strcpy (rat, "rat = ");
4380           if (st_buf.st_fab_rat & FAB$M_CR)
4381             strcat (rat, "cr");
4382           else if (st_buf.st_fab_rat & FAB$M_FTN)
4383             strcat (rat, "ftn");
4384           else if (st_buf.st_fab_rat & FAB$M_PRN)
4385             strcat (rat, "prn");
4386           if (st_buf.st_fab_rat & FAB$M_BLK)
4387             if (st_buf.st_fab_rat & (FAB$M_CR|FAB$M_FTN|FAB$M_PRN))
4388               strcat (rat, ", blk");
4389             else
4390               strcat (rat, "blk");
4391           return creat (name, 0, rfm, rat, fsz);
4392
4393         case FAB$C_STM:
4394           strcpy (rfm, "rfm = stm");
4395           break;
4396
4397         case FAB$C_STMCR:
4398           strcpy (rfm, "rfm = stmcr");
4399           break;
4400
4401         case FAB$C_STMLF:
4402           strcpy (rfm, "rfm = stmlf");
4403           break;
4404
4405         case FAB$C_UDF:
4406           strcpy (rfm, "rfm = udf");
4407           break;
4408
4409         case FAB$C_VAR:
4410           strcpy (rfm, "rfm = var");
4411           break;
4412         }
4413       strcpy (rat, "rat = ");
4414       if (st_buf.st_fab_rat & FAB$M_CR)
4415         strcat (rat, "cr");
4416       else if (st_buf.st_fab_rat & FAB$M_FTN)
4417         strcat (rat, "ftn");
4418       else if (st_buf.st_fab_rat & FAB$M_PRN)
4419         strcat (rat, "prn");
4420       if (st_buf.st_fab_rat & FAB$M_BLK)
4421         if (st_buf.st_fab_rat & (FAB$M_CR|FAB$M_FTN|FAB$M_PRN))
4422           strcat (rat, ", blk");
4423         else
4424           strcat (rat, "blk");
4425     }
4426   else
4427     {
4428       strcpy (rfm, vms_stmlf_recfm ? "rfm = stmlf" : "rfm=var");
4429       strcpy (rat, "rat=cr");
4430     }
4431   /* Until the VAX C RTL fixes the many bugs with modes, always use
4432      mode 0 to get the user's default protection. */
4433   fd = creat (name, 0, rfm, rat);
4434   if (fd < 0 && errno == EEXIST)
4435     {
4436       if (unlink (name) < 0)
4437         report_file_error ("delete", build_string (name));
4438       fd = creat (name, 0, rfm, rat);
4439     }
4440   return fd;
4441 }
4442 #endif /* creat */
4443
4444 /* fwrite to stdout is S L O W.  Speed it up by using fputc...*/
4445 sys_fwrite (ptr, size, num, fp)
4446      register char * ptr;
4447      FILE * fp;
4448 {
4449   register int tot = num * size;
4450
4451   while (tot--)
4452     fputc (*ptr++, fp);
4453 }
4454
4455 /*
4456  * The VMS C library routine creat actually creates a new version of an
4457  * existing file rather than truncating the old version.  There are times
4458  * when this is not the desired behavior, for instance, when writing an
4459  * auto save file (you only want one version), or when you don't have
4460  * write permission in the directory containing the file (but the file
4461  * itself is writable).  Hence this routine, which is equivalent to
4462  * "close (creat (fn, 0));" on Unix if fn already exists.
4463  */
4464 int
4465 vms_truncate (fn)
4466      char *fn;
4467 {
4468   struct FAB xfab = cc$rms_fab;
4469   struct RAB xrab = cc$rms_rab;
4470   int status;
4471
4472   xfab.fab$l_fop = FAB$M_TEF;   /* free allocated but unused blocks on close */
4473   xfab.fab$b_fac = FAB$M_TRN | FAB$M_GET; /* allow truncate and get access */
4474   xfab.fab$b_shr = FAB$M_NIL;   /* allow no sharing - file must be locked */
4475   xfab.fab$l_fna = fn;
4476   xfab.fab$b_fns = strlen (fn);
4477   xfab.fab$l_dna = ";0";        /* default to latest version of the file */
4478   xfab.fab$b_dns = 2;
4479   xrab.rab$l_fab = &xfab;
4480
4481   /* This gibberish opens the file, positions to the first record, and
4482      deletes all records from there until the end of file. */
4483   if ((SYS$OPEN (&xfab) & 01) == 01)
4484     {
4485       if ((SYS$CONNECT (&xrab) & 01) == 01 &&
4486           (SYS$FIND (&xrab) & 01) == 01 &&
4487           (SYS$TRUNCATE (&xrab) & 01) == 01)
4488         status = 0;
4489       else
4490         status = -1;
4491     }
4492   else
4493     status = -1;
4494   SYS$CLOSE (&xfab);
4495   return status;
4496 }
4497
4498 /* Define this symbol to actually read SYSUAF.DAT.  This requires either
4499    SYSPRV or a readable SYSUAF.DAT. */
4500
4501 #ifdef READ_SYSUAF
4502 /*
4503  * getuaf.c
4504  *
4505  * Routine to read the VMS User Authorization File and return
4506  * a specific user's record.
4507  */
4508
4509 static struct UAF retuaf;
4510
4511 struct UAF *
4512 get_uaf_name (uname)
4513      char * uname;
4514 {
4515   register status;
4516   struct FAB uaf_fab;
4517   struct RAB uaf_rab;
4518
4519   uaf_fab = cc$rms_fab;
4520   uaf_rab = cc$rms_rab;
4521   /* initialize fab fields */
4522   uaf_fab.fab$l_fna = "SYS$SYSTEM:SYSUAF.DAT";
4523   uaf_fab.fab$b_fns = 21;
4524   uaf_fab.fab$b_fac = FAB$M_GET;
4525   uaf_fab.fab$b_org = FAB$C_IDX;
4526   uaf_fab.fab$b_shr = FAB$M_GET|FAB$M_PUT|FAB$M_UPD|FAB$M_DEL;
4527   /* initialize rab fields */
4528   uaf_rab.rab$l_fab = &uaf_fab;
4529   /* open the User Authorization File */
4530   status = SYS$OPEN (&uaf_fab);
4531   if (!(status&1))
4532     {
4533       errno = EVMSERR;
4534       vaxc$errno = status;
4535       return 0;
4536     }
4537   status = SYS$CONNECT (&uaf_rab);
4538   if (!(status&1))
4539     {
4540       errno = EVMSERR;
4541       vaxc$errno = status;
4542       return 0;
4543     }
4544   /* read the requested record - index is in uname */
4545   uaf_rab.rab$l_kbf = uname;
4546   uaf_rab.rab$b_ksz = strlen (uname);
4547   uaf_rab.rab$b_rac = RAB$C_KEY;
4548   uaf_rab.rab$l_ubf = (char *)&retuaf;
4549   uaf_rab.rab$w_usz = sizeof retuaf;
4550   status = SYS$GET (&uaf_rab);
4551   if (!(status&1))
4552     {
4553       errno = EVMSERR;
4554       vaxc$errno = status;
4555       return 0;
4556     }
4557   /* close the User Authorization File */
4558   status = SYS$DISCONNECT (&uaf_rab);
4559   if (!(status&1))
4560     {
4561       errno = EVMSERR;
4562       vaxc$errno = status;
4563       return 0;
4564     }
4565   status = SYS$CLOSE (&uaf_fab);
4566   if (!(status&1))
4567     {
4568       errno = EVMSERR;
4569       vaxc$errno = status;
4570       return 0;
4571     }
4572   return &retuaf;
4573 }
4574
4575 struct UAF *
4576 get_uaf_uic (uic)
4577      unsigned long uic;
4578 {
4579   register status;
4580   struct FAB uaf_fab;
4581   struct RAB uaf_rab;
4582
4583   uaf_fab = cc$rms_fab;
4584   uaf_rab = cc$rms_rab;
4585   /* initialize fab fields */
4586   uaf_fab.fab$l_fna = "SYS$SYSTEM:SYSUAF.DAT";
4587   uaf_fab.fab$b_fns = 21;
4588   uaf_fab.fab$b_fac = FAB$M_GET;
4589   uaf_fab.fab$b_org = FAB$C_IDX;
4590   uaf_fab.fab$b_shr = FAB$M_GET|FAB$M_PUT|FAB$M_UPD|FAB$M_DEL;
4591   /* initialize rab fields */
4592   uaf_rab.rab$l_fab = &uaf_fab;
4593   /* open the User Authorization File */
4594   status = SYS$OPEN (&uaf_fab);
4595   if (!(status&1))
4596     {
4597       errno = EVMSERR;
4598       vaxc$errno = status;
4599       return 0;
4600     }
4601   status = SYS$CONNECT (&uaf_rab);
4602   if (!(status&1))
4603     {
4604       errno = EVMSERR;
4605       vaxc$errno = status;
4606       return 0;
4607     }
4608   /* read the requested record - index is in uic */
4609   uaf_rab.rab$b_krf = 1;        /* 1st alternate key */
4610   uaf_rab.rab$l_kbf = (char *) &uic;
4611   uaf_rab.rab$b_ksz = sizeof uic;
4612   uaf_rab.rab$b_rac = RAB$C_KEY;
4613   uaf_rab.rab$l_ubf = (char *)&retuaf;
4614   uaf_rab.rab$w_usz = sizeof retuaf;
4615   status = SYS$GET (&uaf_rab);
4616   if (!(status&1))
4617     {
4618       errno = EVMSERR;
4619       vaxc$errno = status;
4620       return 0;
4621     }
4622   /* close the User Authorization File */
4623   status = SYS$DISCONNECT (&uaf_rab);
4624   if (!(status&1))
4625     {
4626       errno = EVMSERR;
4627       vaxc$errno = status;
4628       return 0;
4629     }
4630   status = SYS$CLOSE (&uaf_fab);
4631   if (!(status&1))
4632     {
4633       errno = EVMSERR;
4634       vaxc$errno = status;
4635       return 0;
4636     }
4637   return &retuaf;
4638 }
4639
4640 static struct passwd retpw;
4641
4642 struct passwd *
4643 cnv_uaf_pw (up)
4644      struct UAF * up;
4645 {
4646   char * ptr;
4647
4648   /* copy these out first because if the username is 32 chars, the next
4649      section will overwrite the first byte of the UIC */
4650   retpw.pw_uid = up->uaf$w_mem;
4651   retpw.pw_gid = up->uaf$w_grp;
4652
4653   /* I suppose this is not the best style, to possibly overwrite one
4654      byte beyond the end of the field, but what the heck... */
4655   ptr = &up->uaf$t_username[UAF$S_USERNAME];
4656   while (ptr[-1] == ' ')
4657     ptr--;
4658   *ptr = '\0';
4659   strcpy (retpw.pw_name, up->uaf$t_username);
4660
4661   /* the rest of these are counted ascii strings */
4662   strncpy (retpw.pw_gecos, &up->uaf$t_owner[1], up->uaf$t_owner[0]);
4663   retpw.pw_gecos[up->uaf$t_owner[0]] = '\0';
4664   strncpy (retpw.pw_dir, &up->uaf$t_defdev[1], up->uaf$t_defdev[0]);
4665   retpw.pw_dir[up->uaf$t_defdev[0]] = '\0';
4666   strncat (retpw.pw_dir, &up->uaf$t_defdir[1], up->uaf$t_defdir[0]);
4667   retpw.pw_dir[up->uaf$t_defdev[0] + up->uaf$t_defdir[0]] = '\0';
4668   strncpy (retpw.pw_shell, &up->uaf$t_defcli[1], up->uaf$t_defcli[0]);
4669   retpw.pw_shell[up->uaf$t_defcli[0]] = '\0';
4670
4671   return &retpw;
4672 }
4673 #else /* not READ_SYSUAF */
4674 static struct passwd retpw;
4675 #endif /* not READ_SYSUAF */
4676
4677 struct passwd *
4678 getpwnam (name)
4679      char * name;
4680 {
4681 #ifdef READ_SYSUAF
4682   struct UAF *up;
4683 #else
4684   char * user;
4685   char * dir;
4686   unsigned char * full;
4687 #endif /* READ_SYSUAF */
4688   char *ptr = name;
4689
4690   while (*ptr)
4691     {
4692       if ('a' <= *ptr && *ptr <= 'z')
4693         *ptr -= 040;
4694       ptr++;
4695     }
4696 #ifdef READ_SYSUAF
4697   if (!(up = get_uaf_name (name)))
4698     return 0;
4699   return cnv_uaf_pw (up);
4700 #else
4701   if (strcmp (name, getenv ("USER")) == 0)
4702     {
4703       retpw.pw_uid = getuid ();
4704       retpw.pw_gid = getgid ();
4705       strcpy (retpw.pw_name, name);
4706       if (full = egetenv ("FULLNAME"))
4707         strcpy (retpw.pw_gecos, full);
4708       else
4709         *retpw.pw_gecos = '\0';
4710       strcpy (retpw.pw_dir, egetenv ("HOME"));
4711       *retpw.pw_shell = '\0';
4712       return &retpw;
4713     }
4714   else
4715     return 0;
4716 #endif /* not READ_SYSUAF */
4717 }
4718
4719 struct passwd *
4720 getpwuid (uid)
4721      unsigned long uid;
4722 {
4723 #ifdef READ_SYSUAF
4724   struct UAF * up;
4725
4726   if (!(up = get_uaf_uic (uid)))
4727     return 0;
4728   return cnv_uaf_pw (up);
4729 #else
4730   if (uid == sys_getuid ())
4731     return getpwnam (egetenv ("USER"));
4732   else
4733     return 0;
4734 #endif /* not READ_SYSUAF */
4735 }
4736
4737 /* return total address space available to the current process.  This is
4738    the sum of the current p0 size, p1 size and free page table entries
4739    available. */
4740 vlimit ()
4741 {
4742   int item_code;
4743   unsigned long free_pages;
4744   unsigned long frep0va;
4745   unsigned long frep1va;
4746   register status;
4747
4748   item_code = JPI$_FREPTECNT;
4749   if (((status = LIB$GETJPI (&item_code, 0, 0, &free_pages)) & 1) == 0)
4750     {
4751       errno = EVMSERR;
4752       vaxc$errno = status;
4753       return -1;
4754     }
4755   free_pages *= 512;
4756
4757   item_code = JPI$_FREP0VA;
4758   if (((status = LIB$GETJPI (&item_code, 0, 0, &frep0va)) & 1) == 0)
4759     {
4760       errno = EVMSERR;
4761       vaxc$errno = status;
4762       return -1;
4763     }
4764   item_code = JPI$_FREP1VA;
4765   if (((status = LIB$GETJPI (&item_code, 0, 0, &frep1va)) & 1) == 0)
4766     {
4767       errno = EVMSERR;
4768       vaxc$errno = status;
4769       return -1;
4770     }
4771
4772   return free_pages + frep0va + (0x7fffffff - frep1va);
4773 }
4774
4775 define_logical_name (varname, string)
4776      char *varname;
4777      char *string;
4778 {
4779   struct dsc$descriptor_s strdsc =
4780     {strlen (string), DSC$K_DTYPE_T, DSC$K_CLASS_S, string};
4781   struct dsc$descriptor_s envdsc =
4782     {strlen (varname), DSC$K_DTYPE_T, DSC$K_CLASS_S, varname};
4783   struct dsc$descriptor_s lnmdsc =
4784     {7, DSC$K_DTYPE_T, DSC$K_CLASS_S, "LNM$JOB"};
4785
4786   return LIB$SET_LOGICAL (&envdsc, &strdsc, &lnmdsc, 0, 0);
4787 }
4788
4789 delete_logical_name (varname)
4790      char *varname;
4791 {
4792   struct dsc$descriptor_s envdsc =
4793     {strlen (varname), DSC$K_DTYPE_T, DSC$K_CLASS_S, varname};
4794   struct dsc$descriptor_s lnmdsc =
4795     {7, DSC$K_DTYPE_T, DSC$K_CLASS_S, "LNM$JOB"};
4796
4797   return LIB$DELETE_LOGICAL (&envdsc, &lnmdsc);
4798 }
4799
4800 ulimit ()
4801 {}
4802
4803 setpgrp ()
4804 {}
4805
4806 execvp ()
4807 {
4808   error ("execvp system call not implemented");
4809 }
4810
4811 int
4812 rename (from, to)
4813      char *from, *to;
4814 {
4815   int status;
4816   struct FAB from_fab = cc$rms_fab, to_fab = cc$rms_fab;
4817   struct NAM from_nam = cc$rms_nam, to_nam = cc$rms_nam;
4818   char from_esn[NAM$C_MAXRSS];
4819   char to_esn[NAM$C_MAXRSS];
4820
4821   from_fab.fab$l_fna = from;
4822   from_fab.fab$b_fns = strlen (from);
4823   from_fab.fab$l_nam = &from_nam;
4824   from_fab.fab$l_fop = FAB$M_NAM;
4825
4826   from_nam.nam$l_esa = from_esn;
4827   from_nam.nam$b_ess = sizeof from_esn;
4828
4829   to_fab.fab$l_fna = to;
4830   to_fab.fab$b_fns = strlen (to);
4831   to_fab.fab$l_nam = &to_nam;
4832   to_fab.fab$l_fop = FAB$M_NAM;
4833
4834   to_nam.nam$l_esa = to_esn;
4835   to_nam.nam$b_ess = sizeof to_esn;
4836
4837   status = SYS$RENAME (&from_fab, 0, 0, &to_fab);
4838
4839   if (status & 1)
4840     return 0;
4841   else
4842     {
4843       if (status == RMS$_DEV)
4844         errno = EXDEV;
4845       else
4846         errno = EVMSERR;
4847       vaxc$errno = status;
4848       return -1;
4849     }
4850 }
4851
4852 /* This function renames a file like `rename', but it strips
4853    the version number from the "to" filename, such that the "to" file is
4854    will always be a new version.  It also sets the file protection once it is
4855    finished.  The protection that we will use is stored in fab_final_pro,
4856    and was set when we did a creat_copy_attrs to create the file that we
4857    are renaming.
4858
4859    We could use the chmod function, but Eunichs uses 3 bits per user category
4860    to describe the protection, and VMS uses 4 (write and delete are separate
4861    bits).  To maintain portability, the VMS implementation of `chmod' wires
4862    the W and D bits together.  */
4863
4864
4865 static struct fibdef fib;       /* We need this initialized to zero */
4866 char vms_file_written[NAM$C_MAXRSS];
4867
4868 int
4869 rename_sans_version (from,to)
4870      char *from, *to;
4871 {
4872   short int chan;
4873   int stat;
4874   short int iosb[4];
4875   int status;
4876   struct FAB to_fab = cc$rms_fab;
4877   struct NAM to_nam = cc$rms_nam;
4878   struct dsc$descriptor fib_d ={sizeof (fib),0,0,(char*) &fib};
4879   struct dsc$descriptor fib_attr[2]
4880     = {{sizeof (fab_final_pro),ATR$C_FPRO,0,(char*) &fab_final_pro},{0,0,0,0}};
4881   char to_esn[NAM$C_MAXRSS];
4882
4883   $DESCRIPTOR (disk,to_esn);
4884
4885   to_fab.fab$l_fna = to;
4886   to_fab.fab$b_fns = strlen (to);
4887   to_fab.fab$l_nam = &to_nam;
4888   to_fab.fab$l_fop = FAB$M_NAM;
4889
4890   to_nam.nam$l_esa = to_esn;
4891   to_nam.nam$b_ess = sizeof to_esn;
4892
4893   status = SYS$PARSE (&to_fab, 0, 0); /* figure out the full file name */
4894
4895   if (to_nam.nam$l_fnb && NAM$M_EXP_VER)
4896     *(to_nam.nam$l_ver) = '\0';
4897
4898   stat = rename (from, to_esn);
4899   if (stat < 0)
4900     return stat;
4901
4902   strcpy (vms_file_written, to_esn);
4903
4904   to_fab.fab$l_fna = vms_file_written; /* this points to the versionless name */
4905   to_fab.fab$b_fns = strlen (vms_file_written);
4906
4907   /* Now set the file protection to the correct value */
4908   SYS$OPEN (&to_fab, 0, 0);     /* This fills in the nam$w_fid fields */
4909
4910   /* Copy these fields into the fib */
4911   fib.fib$r_fid_overlay.fib$w_fid[0] = to_nam.nam$w_fid[0];
4912   fib.fib$r_fid_overlay.fib$w_fid[1] = to_nam.nam$w_fid[1];
4913   fib.fib$r_fid_overlay.fib$w_fid[2] = to_nam.nam$w_fid[2];
4914
4915   SYS$CLOSE (&to_fab, 0, 0);
4916
4917   stat = SYS$ASSIGN (&disk, &chan, 0, 0); /* open a channel to the disk */
4918   if (!stat)
4919     LIB$SIGNAL (stat);
4920   stat = SYS$QIOW (0, chan, IO$_MODIFY, iosb, 0, 0, &fib_d,
4921                    0, 0, 0, &fib_attr, 0);
4922   if (!stat)
4923     LIB$SIGNAL (stat);
4924   stat = SYS$DASSGN (chan);
4925   if (!stat)
4926     LIB$SIGNAL (stat);
4927   strcpy (vms_file_written, to_esn); /* We will write this to the terminal*/
4928   return 0;
4929 }
4930
4931 link (file, new)
4932      char * file, * new;
4933 {
4934   register status;
4935   struct FAB fab;
4936   struct NAM nam;
4937   unsigned short fid[3];
4938   char esa[NAM$C_MAXRSS];
4939
4940   fab = cc$rms_fab;
4941   fab.fab$l_fop = FAB$M_OFP;
4942   fab.fab$l_fna = file;
4943   fab.fab$b_fns = strlen (file);
4944   fab.fab$l_nam = &nam;
4945
4946   nam = cc$rms_nam;
4947   nam.nam$l_esa = esa;
4948   nam.nam$b_ess = NAM$C_MAXRSS;
4949
4950   status = SYS$PARSE (&fab);
4951   if ((status & 1) == 0)
4952     {
4953       errno = EVMSERR;
4954       vaxc$errno = status;
4955       return -1;
4956     }
4957   status = SYS$SEARCH (&fab);
4958   if ((status & 1) == 0)
4959     {
4960       errno = EVMSERR;
4961       vaxc$errno = status;
4962       return -1;
4963     }
4964
4965   fid[0] = nam.nam$w_fid[0];
4966   fid[1] = nam.nam$w_fid[1];
4967   fid[2] = nam.nam$w_fid[2];
4968
4969   fab.fab$l_fna = new;
4970   fab.fab$b_fns = strlen (new);
4971
4972   status = SYS$PARSE (&fab);
4973   if ((status & 1) == 0)
4974     {
4975       errno = EVMSERR;
4976       vaxc$errno = status;
4977       return -1;
4978     }
4979
4980   nam.nam$w_fid[0] = fid[0];
4981   nam.nam$w_fid[1] = fid[1];
4982   nam.nam$w_fid[2] = fid[2];
4983
4984   nam.nam$l_esa = nam.nam$l_name;
4985   nam.nam$b_esl = nam.nam$b_name + nam.nam$b_type + nam.nam$b_ver;
4986
4987   status = SYS$ENTER (&fab);
4988   if ((status & 1) == 0)
4989     {
4990       errno = EVMSERR;
4991       vaxc$errno = status;
4992       return -1;
4993     }
4994
4995   return 0;
4996 }
4997
4998 croak (badfunc)
4999      char *badfunc;
5000 {
5001   printf ("%s not yet implemented\r\n", badfunc);
5002   reset_sys_modes ();
5003   exit (1);
5004 }
5005
5006 long
5007 random ()
5008 {
5009   /* Arrange to return a range centered on zero.  */
5010   return rand () - (1 << 30);
5011 }
5012
5013 srandom (seed)
5014 {
5015   srand (seed);
5016 }
5017 #endif /* VMS */
5018 \f
5019 #ifdef AIXHFT
5020
5021 /* Called from init_sys_modes.  */
5022 hft_init ()
5023 {
5024   int junk;
5025
5026   /* If we're not on an HFT we shouldn't do any of this.  We determine
5027      if we are on an HFT by trying to get an HFT error code.  If this
5028      call fails, we're not on an HFT. */
5029 #ifdef IBMR2AIX
5030   if (ioctl (0, HFQERROR, &junk) < 0)
5031     return;
5032 #else /* not IBMR2AIX */
5033   if (ioctl (0, HFQEIO, 0) < 0)
5034     return;
5035 #endif /* not IBMR2AIX */
5036
5037   /* On AIX the default hft keyboard mapping uses backspace rather than delete
5038      as the rubout key's ASCII code.  Here this is changed.  The bug is that
5039      there's no way to determine the old mapping, so in reset_sys_modes
5040      we need to assume that the normal map had been present.  Of course, this
5041      code also doesn't help if on a terminal emulator which doesn't understand
5042      HFT VTD's. */
5043   {
5044     struct hfbuf buf;
5045     struct hfkeymap keymap;
5046
5047     buf.hf_bufp = (char *)&keymap;
5048     buf.hf_buflen = sizeof (keymap);
5049     keymap.hf_nkeys = 2;
5050     keymap.hfkey[0].hf_kpos = 15;
5051     keymap.hfkey[0].hf_kstate = HFMAPCHAR | HFSHFNONE;
5052 #ifdef IBMR2AIX
5053     keymap.hfkey[0].hf_keyidh = '<';
5054 #else /* not IBMR2AIX */
5055     keymap.hfkey[0].hf_page = '<';
5056 #endif /* not IBMR2AIX */
5057     keymap.hfkey[0].hf_char = 127;
5058     keymap.hfkey[1].hf_kpos = 15;
5059     keymap.hfkey[1].hf_kstate = HFMAPCHAR | HFSHFSHFT;
5060 #ifdef IBMR2AIX
5061     keymap.hfkey[1].hf_keyidh = '<';
5062 #else /* not IBMR2AIX */
5063     keymap.hfkey[1].hf_page = '<';
5064 #endif /* not IBMR2AIX */
5065     keymap.hfkey[1].hf_char = 127;
5066     hftctl (0, HFSKBD, &buf);
5067   }
5068   /* The HFT system on AIX doesn't optimize for scrolling, so it's really ugly
5069      at times.  */
5070   line_ins_del_ok = char_ins_del_ok = 0;
5071 }
5072
5073 /* Reset the rubout key to backspace. */
5074
5075 hft_reset ()
5076 {
5077   struct hfbuf buf;
5078   struct hfkeymap keymap;
5079   int junk;
5080
5081 #ifdef IBMR2AIX
5082   if (ioctl (0, HFQERROR, &junk) < 0)
5083     return;
5084 #else /* not IBMR2AIX */
5085   if (ioctl (0, HFQEIO, 0) < 0)
5086     return;
5087 #endif /* not IBMR2AIX */
5088
5089   buf.hf_bufp = (char *)&keymap;
5090   buf.hf_buflen = sizeof (keymap);
5091   keymap.hf_nkeys = 2;
5092   keymap.hfkey[0].hf_kpos = 15;
5093   keymap.hfkey[0].hf_kstate = HFMAPCHAR | HFSHFNONE;
5094 #ifdef IBMR2AIX
5095   keymap.hfkey[0].hf_keyidh = '<';
5096 #else /* not IBMR2AIX */
5097   keymap.hfkey[0].hf_page = '<';
5098 #endif /* not IBMR2AIX */
5099   keymap.hfkey[0].hf_char = 8;
5100   keymap.hfkey[1].hf_kpos = 15;
5101   keymap.hfkey[1].hf_kstate = HFMAPCHAR | HFSHFSHFT;
5102 #ifdef IBMR2AIX
5103   keymap.hfkey[1].hf_keyidh = '<';
5104 #else /* not IBMR2AIX */
5105   keymap.hfkey[1].hf_page = '<';
5106 #endif /* not IBMR2AIX */
5107   keymap.hfkey[1].hf_char = 8;
5108   hftctl (0, HFSKBD, &buf);
5109 }
5110
5111 #endif /* AIXHFT */
5112
5113 #ifdef USE_DL_STUBS
5114
5115 /* These are included on Sunos 4.1 when we do not use shared libraries.
5116    X11 libraries may refer to these functions but (we hope) do not
5117    actually call them.  */
5118
5119 void *
5120 dlopen ()
5121 {
5122   return 0;
5123 }
5124
5125 void *
5126 dlsym ()
5127 {
5128   return 0;
5129 }
5130
5131 int
5132 dlclose ()
5133 {
5134   return -1;
5135 }
5136
5137 #endif /* USE_DL_STUBS */
5138 \f
5139 #ifndef BSTRING
5140
5141 #ifndef bzero
5142
5143 void
5144 bzero (b, length)
5145      register char *b;
5146      register int length;
5147 {
5148 #ifdef VMS
5149   short zero = 0;
5150   long max_str = 65535;
5151
5152   while (length > max_str) {
5153     (void) LIB$MOVC5 (&zero, &zero, &zero, &max_str, b);
5154     length -= max_str;
5155     b += max_str;
5156   }
5157   max_str = length;
5158   (void) LIB$MOVC5 (&zero, &zero, &zero, &max_str, b);
5159 #else
5160   while (length-- > 0)
5161     *b++ = 0;
5162 #endif /* not VMS */
5163 }
5164
5165 #endif /* no bzero */
5166 #endif /* BSTRING */
5167
5168 #if (!defined (BSTRING) && !defined (bcopy)) || defined (NEED_BCOPY)
5169 #undef bcopy
5170
5171 /* Saying `void' requires a declaration, above, where bcopy is used
5172    and that declaration causes pain for systems where bcopy is a macro.  */
5173 bcopy (b1, b2, length)
5174      register char *b1;
5175      register char *b2;
5176      register int length;
5177 {
5178 #ifdef VMS
5179   long max_str = 65535;
5180
5181   while (length > max_str) {
5182     (void) LIB$MOVC3 (&max_str, b1, b2);
5183     length -= max_str;
5184     b1 += max_str;
5185     b2 += max_str;
5186   }
5187   max_str = length;
5188   (void) LIB$MOVC3 (&length, b1, b2);
5189 #else
5190   while (length-- > 0)
5191     *b2++ = *b1++;
5192 #endif /* not VMS */
5193 }
5194 #endif /* (defined (BSTRING) && !defined (bcopy)) || defined (NEED_BCOPY) */
5195
5196 #ifndef BSTRING
5197 #ifndef bcmp
5198 int
5199 bcmp (b1, b2, length)   /* This could be a macro! */
5200      register char *b1;
5201      register char *b2;
5202      register int length;
5203 {
5204 #ifdef VMS
5205   struct dsc$descriptor_s src1 = {length, DSC$K_DTYPE_T, DSC$K_CLASS_S, b1};
5206   struct dsc$descriptor_s src2 = {length, DSC$K_DTYPE_T, DSC$K_CLASS_S, b2};
5207
5208   return STR$COMPARE (&src1, &src2);
5209 #else
5210   while (length-- > 0)
5211     if (*b1++ != *b2++)
5212       return 1;
5213
5214   return 0;
5215 #endif /* not VMS */
5216 }
5217 #endif /* no bcmp */
5218 #endif /* not BSTRING */