src/sysdep.c

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