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