src/sysdep.c

   1 /* Interfaces to system-dependent kernel and library entries.
   2    Copyright (C) 1985, 86, 87, 88, 93, 94 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 #include <signal.h>
  22 #include <setjmp.h>
  23
  24 #include <config.h>
  25 #include "lisp.h"
  26 #include "blockinput.h"
  27 #undef NULL
  28
  29 #define min(x,y) ((x) > (y) ? (y) : (x))
  30
  31 /* In this file, open, read and write refer to the system calls,
  32    not our sugared interfaces  sys_open, sys_read and sys_write.
  33    Contrariwise, for systems where we use the system calls directly,
  34    define sys_read, etc. here as aliases for them.  */
  35 #ifndef read
  36 #define sys_read read
  37 #define sys_write write
  38 #endif /* `read' is not a macro */
  39
  40 #undef read
  41 #undef write
  42
  43 #ifdef WINDOWSNT
  44 #define read _read
  45 #define write _write
  46 #include <windows.h>
  47 extern int errno;
  48 #endif /* not WINDOWSNT */
  49
  50 #ifndef close
  51 #define sys_close close
  52 #else
  53 #undef close
  54 #endif
  55
  56 #ifndef open
  57 #define sys_open open
  58 #else /* `open' is a macro */
  59 #undef open
  60 #endif /* `open' is a macro */
  61
  62 /* Does anyone other than VMS need this? */
  63 #ifndef fwrite
  64 #define sys_fwrite fwrite
  65 #else
  66 #undef fwrite
  67 #endif
  68
  69 #ifndef HAVE_H_ERRNO
  70 extern int h_errno;
  71 #endif
  72
  73 #include <stdio.h>
  74 #include <sys/types.h>
  75 #include <sys/stat.h>
  76 #include <errno.h>
  77
  78 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
  79 #include <dos.h>
  80 #include "dosfns.h"
  81 #include "msdos.h"
  82 #include <sys/param.h>
  83 #endif
  84
  85 extern int errno;
  86
  87 #ifdef VMS
  88 #include <rms.h>
  89 #include <ttdef.h>
  90 #include <tt2def.h>
  91 #include <iodef.h>
  92 #include <ssdef.h>
  93 #include <descrip.h>
  94 #include <fibdef.h>
  95 #include <atrdef.h>
  96 #include <ctype.h>
  97 #include <string.h>
  98 #ifdef __GNUC__
  99 #include <sys/file.h>
 100 #else
 101 #include <file.h>
 102 #endif
 103 #undef F_SETFL
 104 #ifndef RAB$C_BID
 105 #include <rab.h>
 106 #endif
 107 #define MAXIOSIZE (32 * PAGESIZE) /* Don't I/O more than 32 blocks at a time */
 108 #endif /* VMS */
 109
 110 #ifndef BSD4_1
 111 #ifdef BSD /* this is done this way to avoid defined (BSD) || defined (USG)
 112               because the vms compiler doesn't grok `defined' */
 113 #include <fcntl.h>
 114 #endif
 115 #ifdef USG
 116 #ifndef USG5
 117 #include <fcntl.h>
 118 #endif
 119 #endif
 120 #endif /* not 4.1 bsd */
 121
 122 #ifndef MSDOS
 123 #include <sys/ioctl.h>
 124 #endif
 125 #include "systty.h"
 126 #include "syswait.h"
 127
 128 #ifdef BROKEN_TIOCGWINSZ
 129 #undef TIOCGWINSZ
 130 #undef TIOCSWINSZ
 131 #endif
 132
 133 #ifdef USG
 134 #include <sys/utsname.h>
 135 #include <string.h>
 136 #ifndef MEMORY_IN_STRING_H
 137 #include <memory.h>
 138 #endif
 139 #if defined (TIOCGWINSZ) || defined (ISC4_0)
 140 #ifdef NEED_SIOCTL
 141 #include <sys/sioctl.h>
 142 #endif
 143 #ifdef NEED_PTEM_H
 144 #include <sys/stream.h>
 145 #include <sys/ptem.h>
 146 #endif
 147 #endif /* TIOCGWINSZ or ISC4_0 */
 148 #endif /* USG */
 149
 150 extern int quit_char;
 151
 152 #include "frame.h"
 153 #include "window.h"
 154 #include "termhooks.h"
 155 #include "termchar.h"
 156 #include "termopts.h"
 157 #include "dispextern.h"
 158 #include "process.h"
 159
 160 #ifdef WINDOWSNT
 161 #include <direct.h>
 162 /* In process.h which conflicts with the local copy.  */
 163 #define _P_WAIT 0
 164 int _CRTAPI1 _spawnlp (int, const char *, const char *, ...);
 165 int _CRTAPI1 _getpid (void);
 166 #endif
 167
 168 #ifdef NONSYSTEM_DIR_LIBRARY
 169 #include "ndir.h"
 170 #endif /* NONSYSTEM_DIR_LIBRARY */
 171
 172 #include "syssignal.h"
 173 #include "systime.h"
 174 #ifdef HAVE_UTIME_H
 175 #include <utime.h>
 176 #endif
 177
 178 #ifndef HAVE_UTIMES
 179 #ifndef HAVE_STRUCT_UTIMBUF
 180 /* We want to use utime rather than utimes, but we couldn't find the
 181    structure declaration.  We'll use the traditional one.  */
 182 struct utimbuf {
 183   long actime;
 184   long modtime;
 185 };
 186 #endif
 187 #endif
 188
 189 /* LPASS8 is new in 4.3, and makes cbreak mode provide all 8 bits.  */
 190 #ifndef LPASS8
 191 #define LPASS8 0
 192 #endif
 193
 194 #ifdef BSD4_1
 195 #define LNOFLSH 0100000
 196 #endif
 197
 198 static int baud_convert[] =
 199 #ifdef BAUD_CONVERT
 200   BAUD_CONVERT;
 201 #else
 202   {
 203     0, 50, 75, 110, 135, 150, 200, 300, 600, 1200,
 204     1800, 2400, 4800, 9600, 19200, 38400
 205   };
 206 #endif
 207
 208 extern short ospeed;
 209
 210 /* The file descriptor for Emacs's input terminal.
 211    Under Unix, this is normally zero except when using X;
 212    under VMS, we place the input channel number here.  */
 213 int input_fd;
 214 \f
 215 /* Specify a different file descriptor for further input operations.  */
 216
 217 void
 218 change_input_fd (fd)
 219      int fd;
 220 {
 221   input_fd = fd;
 222 }
 223
 224 /* Discard pending input on descriptor input_fd.  */
 225
 226 discard_tty_input ()
 227 {
 228 #ifndef WINDOWSNT
 229   struct emacs_tty buf;
 230
 231   if (noninteractive)
 232     return;
 233
 234   /* Discarding input is not safe when the input could contain
 235      replies from the X server.  So don't do it.  */
 236   if (read_socket_hook)
 237     return;
 238
 239 #ifdef VMS
 240   end_kbd_input ();
 241   SYS$QIOW (0, input_fd, IO$_READVBLK|IO$M_PURGE, input_iosb, 0, 0,
 242             &buf.main, 0, 0, terminator_mask, 0, 0);
 243   queue_kbd_input ();
 244 #else /* not VMS */
 245 #ifdef APOLLO
 246   {
 247     int zero = 0;
 248     ioctl (input_fd, TIOCFLUSH, &zero);
 249   }
 250 #else /* not Apollo */
 251 #ifdef MSDOS    /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
 252   while (dos_keyread () != -1)
 253     ;
 254 #else /* not MSDOS */
 255   EMACS_GET_TTY (input_fd, &buf);
 256   EMACS_SET_TTY (input_fd, &buf, 0);
 257 #endif /* not MSDOS */
 258 #endif /* not Apollo */
 259 #endif /* not VMS */
 260 #endif /* not WINDOWSNT */
 261 }
 262
 263 #ifdef SIGTSTP
 264
 265 /* Arrange for character C to be read as the next input from
 266    the terminal.  */
 267
 268 stuff_char (c)
 269      char c;
 270 {
 271   if (read_socket_hook)
 272     return;
 273
 274 /* Should perhaps error if in batch mode */
 275 #ifdef TIOCSTI
 276   ioctl (input_fd, TIOCSTI, &c);
 277 #else /* no TIOCSTI */
 278   error ("Cannot stuff terminal input characters in this version of Unix");
 279 #endif /* no TIOCSTI */
 280 }
 281
 282 #endif /* SIGTSTP */
 283 \f
 284 init_baud_rate ()
 285 {
 286   if (noninteractive)
 287     ospeed = 0;
 288   else
 289     {
 290 #ifdef DOS_NT
 291     ospeed = 15;
 292 #else  /* not DOS_NT */
 293 #ifdef VMS
 294       struct sensemode sg;
 295
 296       SYS$QIOW (0, input_fd, IO$_SENSEMODE, &sg, 0, 0,
 297                 &sg.class, 12, 0, 0, 0, 0 );
 298       ospeed = sg.xmit_baud;
 299 #else /* not VMS */
 300 #ifdef HAVE_TERMIOS
 301       struct termios sg;
 302
 303       sg.c_cflag = B9600;
 304       tcgetattr (input_fd, &sg);
 305       ospeed = cfgetospeed (&sg);
 306 #if defined (USE_GETOBAUD) && defined (getobaud)
 307       /* m88k-motorola-sysv3 needs this (ghazi@noc.rutgers.edu) 9/1/94. */
 308       if (ospeed == 0)
 309         ospeed = getobaud (sg.c_cflag);
 310 #endif
 311 #else /* neither VMS nor TERMIOS */
 312 #ifdef HAVE_TERMIO
 313       struct termio sg;
 314
 315       sg.c_cflag = B9600;
 316 #ifdef HAVE_TCATTR
 317       tcgetattr (input_fd, &sg);
 318 #else
 319       ioctl (input_fd, TCGETA, &sg);
 320 #endif
 321       ospeed = sg.c_cflag & CBAUD;
 322 #else /* neither VMS nor TERMIOS nor TERMIO */
 323       struct sgttyb sg;
 324
 325       sg.sg_ospeed = B9600;
 326       if (ioctl (input_fd, TIOCGETP, &sg) < 0)
 327         abort ();
 328       ospeed = sg.sg_ospeed;
 329 #endif /* not HAVE_TERMIO */
 330 #endif /* not HAVE_TERMIOS */
 331 #endif /* not VMS */
 332 #endif /* not DOS_NT */
 333     }
 334
 335   baud_rate = (ospeed < sizeof baud_convert / sizeof baud_convert[0]
 336                ? baud_convert[ospeed] : 9600);
 337   if (baud_rate == 0)
 338     baud_rate = 1200;
 339 }
 340
 341 /*ARGSUSED*/
 342 set_exclusive_use (fd)
 343      int fd;
 344 {
 345 #ifdef FIOCLEX
 346   ioctl (fd, FIOCLEX, 0);
 347 #endif
 348   /* Ok to do nothing if this feature does not exist */
 349 }
 350 \f
 351 #ifndef subprocesses
 352
 353 wait_without_blocking ()
 354 {
 355 #ifdef BSD
 356   wait3 (0, WNOHANG | WUNTRACED, 0);
 357 #else
 358   croak ("wait_without_blocking");
 359 #endif
 360   synch_process_alive = 0;
 361 }
 362
 363 #endif /* not subprocesses */
 364
 365 int wait_debugging;   /* Set nonzero to make following function work under dbx
 366                          (at least for bsd).  */
 367
 368 SIGTYPE
 369 wait_for_termination_signal ()
 370 {}
 371
 372 /* Wait for subprocess with process id `pid' to terminate and
 373    make sure it will get eliminated (not remain forever as a zombie) */
 374
 375 wait_for_termination (pid)
 376      int pid;
 377 {
 378   while (1)
 379     {
 380 #ifdef subprocesses
 381 #ifdef VMS
 382       int status;
 383
 384       status = SYS$FORCEX (&pid, 0, 0);
 385       break;
 386 #else /* not VMS */
 387 #if defined (BSD) || (defined (HPUX) && !defined (HPUX_5))
 388       /* Note that kill returns -1 even if the process is just a zombie now.
 389          But inevitably a SIGCHLD interrupt should be generated
 390          and child_sig will do wait3 and make the process go away. */
 391       /* There is some indication that there is a bug involved with
 392          termination of subprocesses, perhaps involving a kernel bug too,
 393          but no idea what it is.  Just as a hunch we signal SIGCHLD to see
 394          if that causes the problem to go away or get worse.  */
 395       sigsetmask (sigmask (SIGCHLD));
 396       if (0 > kill (pid, 0))
 397         {
 398           sigsetmask (SIGEMPTYMASK);
 399           kill (getpid (), SIGCHLD);
 400           break;
 401         }
 402       if (wait_debugging)
 403         sleep (1);
 404       else
 405         sigpause (SIGEMPTYMASK);
 406 #else /* not BSD, and not HPUX version >= 6 */
 407 #if defined (UNIPLUS)
 408       if (0 > kill (pid, 0))
 409         break;
 410       wait (0);
 411 #else /* neither BSD nor UNIPLUS: random sysV */
 412 #ifdef POSIX_SIGNALS    /* would this work for LINUX as well? */
 413       sigblock (sigmask (SIGCHLD));
 414       if (0 > kill (pid, 0))
 415         {
 416           sigunblock (sigmask (SIGCHLD));
 417           break;
 418         }
 419       sigpause (SIGEMPTYMASK);
 420 #else /* not POSIX_SIGNALS */
 421 #ifdef HAVE_SYSV_SIGPAUSE
 422       sighold (SIGCHLD);
 423       if (0 > kill (pid, 0))
 424         {
 425           sigrelse (SIGCHLD);
 426           break;
 427         }
 428       sigpause (SIGCHLD);
 429 #else /* not HAVE_SYSV_SIGPAUSE */
 430 #ifdef WINDOWSNT
 431       wait (0);
 432       break;
 433 #else /* not WINDOWSNT */
 434       if (0 > kill (pid, 0))
 435         break;
 436       /* Using sleep instead of pause avoids timing error.
 437          If the inferior dies just before the sleep,
 438          we lose just one second.  */
 439       sleep (1);
 440 #endif /* not WINDOWSNT */
 441 #endif /* not HAVE_SYSV_SIGPAUSE */
 442 #endif /* not POSIX_SIGNALS */
 443 #endif /* not UNIPLUS */
 444 #endif /* not BSD, and not HPUX version >= 6 */
 445 #endif /* not VMS */
 446 #else /* not subprocesses */
 447 #ifndef BSD4_1
 448       if (kill (pid, 0) < 0)
 449         break;
 450       wait (0);
 451 #else /* BSD4_1 */
 452       int status;
 453       status = wait (0);
 454       if (status == pid || status == -1)
 455         break;
 456 #endif /* BSD4_1 */
 457 #endif /* not subprocesses */
 458     }
 459 }
 460
 461 #ifdef subprocesses
 462
 463 /*
 464  *      flush any pending output
 465  *      (may flush input as well; it does not matter the way we use it)
 466  */
 467
 468 flush_pending_output (channel)
 469      int channel;
 470 {
 471 #ifdef HAVE_TERMIOS
 472   /* If we try this, we get hit with SIGTTIN, because
 473      the child's tty belongs to the child's pgrp. */
 474 #else
 475 #ifdef TCFLSH
 476   ioctl (channel, TCFLSH, 1);
 477 #else
 478 #ifdef TIOCFLUSH
 479   int zero = 0;
 480   /* 3rd arg should be ignored
 481      but some 4.2 kernels actually want the address of an int
 482      and nonzero means something different.  */
 483   ioctl (channel, TIOCFLUSH, &zero);
 484 #endif
 485 #endif
 486 #endif
 487 }
 488 \f
 489 #ifndef VMS
 490 /*  Set up the terminal at the other end of a pseudo-terminal that
 491     we will be controlling an inferior through.
 492     It should not echo or do line-editing, since that is done
 493     in Emacs.  No padding needed for insertion into an Emacs buffer.  */
 494
 495 child_setup_tty (out)
 496      int out;
 497 {
 498 #ifndef DOS_NT
 499   struct emacs_tty s;
 500
 501   EMACS_GET_TTY (out, &s);
 502
 503 #if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
 504   s.main.c_oflag |= OPOST;      /* Enable output postprocessing */
 505   s.main.c_oflag &= ~ONLCR;     /* Disable map of NL to CR-NL on output */
 506 #ifdef NLDLY
 507   s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
 508                                 /* No output delays */
 509 #endif
 510   s.main.c_lflag &= ~ECHO;      /* Disable echo */
 511   s.main.c_lflag |= ISIG;       /* Enable signals */
 512 #ifdef IUCLC
 513   s.main.c_iflag &= ~IUCLC;     /* Disable downcasing on input.  */
 514 #endif
 515 #ifdef OLCUC
 516   s.main.c_oflag &= ~OLCUC;     /* Disable upcasing on output.  */
 517 #endif
 518   s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
 519 #if 0
 520   /* Said to be unnecessary:  */
 521   s.main.c_cc[VMIN] = 1;        /* minimum number of characters to accept  */
 522   s.main.c_cc[VTIME] = 0;       /* wait forever for at least 1 character  */
 523 #endif
 524
 525   s.main.c_lflag |= ICANON;     /* Enable erase/kill and eof processing */
 526   s.main.c_cc[VEOF] = 04;       /* insure that EOF is Control-D */
 527   s.main.c_cc[VERASE] = CDISABLE;       /* disable erase processing */
 528   s.main.c_cc[VKILL] = CDISABLE;        /* disable kill processing */
 529
 530 #ifdef HPUX
 531   s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
 532 #endif /* HPUX */
 533
 534 #ifdef AIX
 535 /* AIX enhanced edit loses NULs, so disable it */
 536 #ifndef IBMR2AIX
 537   s.main.c_line = 0;
 538   s.main.c_iflag &= ~ASCEDIT;
 539 #endif
 540   /* Also, PTY overloads NUL and BREAK.
 541      don't ignore break, but don't signal either, so it looks like NUL.  */
 542   s.main.c_iflag &= ~IGNBRK;
 543   s.main.c_iflag &= ~BRKINT;
 544   /* QUIT and INTR work better as signals, so disable character forms */
 545   s.main.c_cc[VINTR] = 0377;
 546 #ifdef SIGNALS_VIA_CHARACTERS
 547   /* the QUIT and INTR character are used in process_send_signal
 548      so set them here to something useful.  */
 549   if (s.main.c_cc[VQUIT] == 0377)
 550     s.main.c_cc[VQUIT] = '\\'&037;      /* Control-\ */
 551   if (s.main.c_cc[VINTR] == 0377)
 552     s.main.c_cc[VINTR] = 'C'&037;       /* Control-C */
 553 #else /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
 554   /* QUIT and INTR work better as signals, so disable character forms */
 555   s.main.c_cc[VQUIT] = 0377;
 556   s.main.c_cc[VINTR] = 0377;
 557   s.main.c_lflag &= ~ISIG;
 558 #endif /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
 559   s.main.c_cc[VEOL] = 0377;
 560   s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
 561 #endif /* AIX */
 562
 563 #else /* not HAVE_TERMIO */
 564
 565   s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
 566                        | CBREAK | TANDEM);
 567   s.main.sg_flags |= LPASS8;
 568   s.main.sg_erase = 0377;
 569   s.main.sg_kill = 0377;
 570   s.lmode = LLITOUT | s.lmode;        /* Don't strip 8th bit */
 571
 572 #endif /* not HAVE_TERMIO */
 573
 574   EMACS_SET_TTY (out, &s, 0);
 575
 576 #ifdef BSD4_1
 577   if (interrupt_input)
 578     reset_sigio ();
 579 #endif /* BSD4_1 */
 580 #ifdef RTU
 581   {
 582     int zero = 0;
 583     ioctl (out, FIOASYNC, &zero);
 584   }
 585 #endif /* RTU */
 586 #endif /* not DOS_NT */
 587 }
 588 #endif /* not VMS */
 589
 590 #endif /* subprocesses */
 591 \f
 592 /* Record a signal code and the handler for it.  */
 593 struct save_signal
 594 {
 595   int code;
 596   SIGTYPE (*handler) ();
 597 };
 598
 599 /* Suspend the Emacs process; give terminal to its superior.  */
 600
 601 sys_suspend ()
 602 {
 603 #ifdef VMS
 604   /* "Foster" parentage allows emacs to return to a subprocess that attached
 605      to the current emacs as a cheaper than starting a whole new process.  This
 606      is set up by KEPTEDITOR.COM.  */
 607   unsigned long parent_id, foster_parent_id;
 608   char *fpid_string;
 609
 610   fpid_string = getenv ("EMACS_PARENT_PID");
 611   if (fpid_string != NULL)
 612     {
 613       sscanf (fpid_string, "%x", &foster_parent_id);
 614       if (foster_parent_id != 0)
 615         parent_id = foster_parent_id;
 616       else
 617         parent_id = getppid ();
 618     }
 619   else
 620     parent_id = getppid ();
 621
 622   xfree (fpid_string);          /* On VMS, this was malloc'd */
 623
 624   if (parent_id && parent_id != 0xffffffff)
 625     {
 626       SIGTYPE (*oldsig)() = (int) signal (SIGINT, SIG_IGN);
 627       int status = LIB$ATTACH (&parent_id) & 1;
 628       signal (SIGINT, oldsig);
 629       return status;
 630     }
 631   else
 632     {
 633       struct {
 634         int     l;
 635         char    *a;
 636       } d_prompt;
 637       d_prompt.l = sizeof ("Emacs: ");          /* Our special prompt */
 638       d_prompt.a = "Emacs: ";                   /* Just a reminder */
 639       LIB$SPAWN (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &d_prompt, 0);
 640       return 1;
 641     }
 642   return -1;
 643 #else
 644 #if defined(SIGTSTP) && !defined(MSDOS)
 645
 646   {
 647     int pgrp = EMACS_GETPGRP (0);
 648     EMACS_KILLPG (pgrp, SIGTSTP);
 649   }
 650
 651 #else /* No SIGTSTP */
 652 #ifdef USG_JOBCTRL /* If you don't know what this is don't mess with it */
 653   ptrace (0, 0, 0, 0);          /* set for ptrace - caught by csh */
 654   kill (getpid (), SIGQUIT);
 655
 656 #else /* No SIGTSTP or USG_JOBCTRL */
 657
 658 /* On a system where suspending is not implemented,
 659    instead fork a subshell and let it talk directly to the terminal
 660    while we wait.  */
 661   sys_subshell ();
 662
 663 #endif /* no USG_JOBCTRL */
 664 #endif /* no SIGTSTP */
 665 #endif /* not VMS */
 666 }
 667
 668 /* Fork a subshell.  */
 669
 670 sys_subshell ()
 671 {
 672 #ifndef VMS
 673 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
 674   int st;
 675   char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS.  */
 676 #endif
 677   int pid;
 678   struct save_signal saved_handlers[5];
 679   Lisp_Object dir;
 680   unsigned char *str = 0;
 681   int len;
 682
 683   saved_handlers[0].code = SIGINT;
 684   saved_handlers[1].code = SIGQUIT;
 685   saved_handlers[2].code = SIGTERM;
 686 #ifdef SIGIO
 687   saved_handlers[3].code = SIGIO;
 688   saved_handlers[4].code = 0;
 689 #else
 690   saved_handlers[3].code = 0;
 691 #endif
 692
 693   /* Mentioning current_buffer->buffer would mean including buffer.h,
 694      which somehow wedges the hp compiler.  So instead...  */
 695
 696   dir = intern ("default-directory");
 697   if (NILP (Fboundp (dir)))
 698     goto xyzzy;
 699   dir = Fsymbol_value (dir);
 700   if (!STRINGP (dir))
 701     goto xyzzy;
 702
 703   dir = expand_and_dir_to_file (Funhandled_file_name_directory (dir), Qnil);
 704   str = (unsigned char *) alloca (XSTRING (dir)->size + 2);
 705   len = XSTRING (dir)->size;
 706   bcopy (XSTRING (dir)->data, str, len);
 707   if (str[len - 1] != '/') str[len++] = '/';
 708   str[len] = 0;
 709  xyzzy:
 710
 711 #ifdef WINDOWSNT
 712   pid = -1;
 713 #else /* not WINDOWSNT */
 714   pid = vfork ();
 715
 716   if (pid == -1)
 717     error ("Can't spawn subshell");
 718   if (pid == 0)
 719 #endif /* not WINDOWSNT */
 720     {
 721       char *sh;
 722
 723 #ifdef MSDOS    /* MW, Aug 1993 */
 724       getwd (oldwd);
 725 #endif
 726       sh = (char *) egetenv ("SHELL");
 727       if (sh == 0)
 728         sh = "sh";
 729
 730       /* Use our buffer's default directory for the subshell.  */
 731       if (str)
 732         chdir (str);
 733
 734 #ifdef subprocesses
 735       close_process_descs ();   /* Close Emacs's pipes/ptys */
 736 #endif
 737
 738 #ifdef SET_EMACS_PRIORITY
 739       {
 740         extern int emacs_priority;
 741
 742         if (emacs_priority < 0)
 743           nice (-emacs_priority);
 744       }
 745 #endif
 746
 747 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
 748       st = system (sh);
 749       chdir (oldwd);
 750       if (st)
 751         report_file_error ("Can't execute subshell", Fcons (build_string (sh), Qnil));
 752 #else /* not MSDOS */
 753 #ifdef  WINDOWSNT
 754       restore_console ();
 755
 756       /* Waits for process completion */
 757       pid = _spawnlp (_P_WAIT, sh, sh, NULL);
 758       if (pid == -1)
 759         write (1, "Can't execute subshell", 22);
 760
 761       take_console ();
 762 #else   /* not WINDOWSNT */
 763       execlp (sh, sh, 0);
 764       write (1, "Can't execute subshell", 22);
 765       _exit (1);
 766 #endif  /* not WINDOWSNT */
 767 #endif /* not MSDOS */
 768     }
 769
 770   save_signal_handlers (saved_handlers);
 771   synch_process_alive = 1;
 772   wait_for_termination (pid);
 773   restore_signal_handlers (saved_handlers);
 774 #endif /* !VMS */
 775 }
 776
 777 save_signal_handlers (saved_handlers)
 778      struct save_signal *saved_handlers;
 779 {
 780   while (saved_handlers->code)
 781     {
 782       saved_handlers->handler
 783         = (SIGTYPE (*) ()) signal (saved_handlers->code, SIG_IGN);
 784       saved_handlers++;
 785     }
 786 }
 787
 788 restore_signal_handlers (saved_handlers)
 789      struct save_signal *saved_handlers;
 790 {
 791   while (saved_handlers->code)
 792     {
 793       signal (saved_handlers->code, saved_handlers->handler);
 794       saved_handlers++;
 795     }
 796 }
 797 \f
 798 #ifdef F_SETFL
 799
 800 int old_fcntl_flags;
 801
 802 init_sigio (fd)
 803      int fd;
 804 {
 805 #ifdef FASYNC
 806   old_fcntl_flags = fcntl (fd, F_GETFL, 0) & ~FASYNC;
 807   fcntl (fd, F_SETFL, old_fcntl_flags | FASYNC);
 808 #endif
 809   interrupts_deferred = 0;
 810 }
 811
 812 reset_sigio ()
 813 {
 814   unrequest_sigio ();
 815 }
 816
 817 #ifdef FASYNC           /* F_SETFL does not imply existence of FASYNC */
 818
 819 request_sigio ()
 820 {
 821   if (read_socket_hook)
 822     return;
 823
 824 #ifdef SIGWINCH
 825   sigunblock (sigmask (SIGWINCH));
 826 #endif
 827   fcntl (input_fd, F_SETFL, old_fcntl_flags | FASYNC);
 828
 829   interrupts_deferred = 0;
 830 }
 831
 832 unrequest_sigio ()
 833 {
 834   if (read_socket_hook)
 835     return;
 836
 837 #ifdef SIGWINCH
 838   sigblock (sigmask (SIGWINCH));
 839 #endif
 840   fcntl (input_fd, F_SETFL, old_fcntl_flags);
 841   interrupts_deferred = 1;
 842 }
 843
 844 #else /* no FASYNC */
 845 #ifdef STRIDE           /* Stride doesn't have FASYNC - use FIOASYNC */
 846
 847 request_sigio ()
 848 {
 849   int on = 1;
 850
 851   if (read_socket_hook)
 852     return;
 853
 854   ioctl (input_fd, FIOASYNC, &on);
 855   interrupts_deferred = 0;
 856 }
 857
 858 unrequest_sigio ()
 859 {
 860   int off = 0;
 861
 862   if (read_socket_hook)
 863     return;
 864
 865   ioctl (input_fd, FIOASYNC, &off);
 866   interrupts_deferred = 1;
 867 }
 868
 869 #else /* not FASYNC, not STRIDE */
 870
 871 #ifdef _CX_UX
 872
 873 #include <termios.h>
 874
 875 request_sigio ()
 876 {
 877   int on = 1;
 878   sigset_t st;
 879
 880   if (read_socket_hook)
 881     return;
 882
 883   sigemptyset(&st);
 884   sigaddset(&st, SIGIO);
 885   ioctl (input_fd, FIOASYNC, &on);
 886   interrupts_deferred = 0;
 887   sigprocmask(SIG_UNBLOCK, &st, (sigset_t *)0);
 888 }
 889
 890 unrequest_sigio ()
 891 {
 892   int off = 0;
 893
 894   if (read_socket_hook)
 895     return;
 896
 897   ioctl (input_fd, FIOASYNC, &off);
 898   interrupts_deferred = 1;
 899 }
 900
 901 #else /* ! _CX_UX */
 902
 903 request_sigio ()
 904 {
 905   if (read_socket_hook)
 906     return;
 907
 908   croak ("request_sigio");
 909 }
 910
 911 unrequest_sigio ()
 912 {
 913   if (read_socket_hook)
 914     return;
 915
 916   croak ("unrequest_sigio");
 917 }
 918
 919 #endif /* _CX_UX */
 920 #endif /* STRIDE */
 921 #endif /* FASYNC */
 922 #endif /* F_SETFL */
 923 \f
 924 /* Saving and restoring the process group of Emacs's terminal.  */
 925
 926 #ifdef BSD_PGRPS
 927
 928 /* The process group of which Emacs was a member when it initially
 929    started.
 930
 931    If Emacs was in its own process group (i.e. inherited_pgroup ==
 932    getpid ()), then we know we're running under a shell with job
 933    control (Emacs would never be run as part of a pipeline).
 934    Everything is fine.
 935
 936    If Emacs was not in its own process group, then we know we're
 937    running under a shell (or a caller) that doesn't know how to
 938    separate itself from Emacs (like sh).  Emacs must be in its own
 939    process group in order to receive SIGIO correctly.  In this
 940    situation, we put ourselves in our own pgroup, forcibly set the
 941    tty's pgroup to our pgroup, and make sure to restore and reinstate
 942    the tty's pgroup just like any other terminal setting.  If
 943    inherited_group was not the tty's pgroup, then we'll get a
 944    SIGTTmumble when we try to change the tty's pgroup, and a CONT if
 945    it goes foreground in the future, which is what should happen.  */
 946 int inherited_pgroup;
 947
 948 /* Split off the foreground process group to Emacs alone.
 949    When we are in the foreground, but not started in our own process
 950    group, redirect the TTY to point to our own process group.  We need
 951    to be in our own process group to receive SIGIO properly.  */
 952 narrow_foreground_group ()
 953 {
 954   int me = getpid ();
 955
 956   setpgrp (0, inherited_pgroup);
 957   if (inherited_pgroup != me)
 958     EMACS_SET_TTY_PGRP (input_fd, &me);
 959   setpgrp (0, me);
 960 }
 961
 962 /* Set the tty to our original foreground group.  */
 963 widen_foreground_group ()
 964 {
 965   if (inherited_pgroup != getpid ())
 966     EMACS_SET_TTY_PGRP (input_fd, &inherited_pgroup);
 967   setpgrp (0, inherited_pgroup);
 968 }
 969
 970 #endif /* BSD_PGRPS */
 971 \f
 972 /* Getting and setting emacs_tty structures.  */
 973
 974 /* Set *TC to the parameters associated with the terminal FD.
 975    Return zero if all's well, or -1 if we ran into an error we
 976    couldn't deal with.  */
 977 int
 978 emacs_get_tty (fd, settings)
 979      int fd;
 980      struct emacs_tty *settings;
 981 {
 982   /* Retrieve the primary parameters - baud rate, character size, etcetera.  */
 983 #ifdef HAVE_TCATTR
 984   /* We have those nifty POSIX tcmumbleattr functions.  */
 985   if (tcgetattr (fd, &settings->main) < 0)
 986     return -1;
 987
 988 #else
 989 #ifdef HAVE_TERMIO
 990   /* The SYSV-style interface?  */
 991   if (ioctl (fd, TCGETA, &settings->main) < 0)
 992     return -1;
 993
 994 #else
 995 #ifdef VMS
 996   /* Vehemently Monstrous System?  :-)  */
 997   if (! (SYS$QIOW (0, fd, IO$_SENSEMODE, settings, 0, 0,
 998                    &settings->main.class, 12, 0, 0, 0, 0)
 999          & 1))
1000     return -1;
1001
1002 #else
1003 #ifndef DOS_NT
1004   /* I give up - I hope you have the BSD ioctls.  */
1005   if (ioctl (fd, TIOCGETP, &settings->main) < 0)
1006     return -1;
1007 #endif /* not DOS_NT */
1008 #endif
1009 #endif
1010 #endif
1011
1012   /* Suivant - Do we have to get struct ltchars data?  */
1013 #ifdef HAVE_LTCHARS
1014   if (ioctl (fd, TIOCGLTC, &settings->ltchars) < 0)
1015     return -1;
1016 #endif
1017
1018   /* How about a struct tchars and a wordful of lmode bits?  */
1019 #ifdef HAVE_TCHARS
1020   if (ioctl (fd, TIOCGETC, &settings->tchars) < 0
1021       || ioctl (fd, TIOCLGET, &settings->lmode) < 0)
1022     return -1;
1023 #endif
1024
1025   /* We have survived the tempest.  */
1026   return 0;
1027 }
1028
1029
1030 /* Set the parameters of the tty on FD according to the contents of
1031    *SETTINGS.  If WAITP is non-zero, we wait for all queued output to
1032    be written before making the change; otherwise, we forget any
1033    queued input and make the change immediately.
1034    Return 0 if all went well, and -1 if anything failed.  */
1035 int
1036 emacs_set_tty (fd, settings, waitp)
1037      int fd;
1038      struct emacs_tty *settings;
1039      int waitp;
1040 {
1041   /* Set the primary parameters - baud rate, character size, etcetera.  */
1042 #ifdef HAVE_TCATTR
1043   int i;
1044   /* We have those nifty POSIX tcmumbleattr functions.
1045      William J. Smith <wjs@wiis.wang.com> writes:
1046      "POSIX 1003.1 defines tcsetattr() to return success if it was
1047      able to perform any of the requested actions, even if some
1048      of the requested actions could not be performed.
1049      We must read settings back to ensure tty setup properly.
1050      AIX requires this to keep tty from hanging occasionally."  */
1051   /* This make sure that we don't loop indefinitely in here.  */
1052   for (i = 0 ; i < 10 ; i++)
1053     if (tcsetattr (fd, waitp ? TCSAFLUSH : TCSADRAIN, &settings->main) < 0)
1054       {
1055         if (errno == EINTR)
1056           continue;
1057         else
1058           return -1;
1059       }
1060     else
1061       {
1062         struct termios new;
1063
1064         /* Get the current settings, and see if they're what we asked for.  */
1065         tcgetattr (fd, &new);
1066         /* We cannot use memcmp on the whole structure here because under
1067          * aix386 the termios structure has some reserved field that may
1068          * not be filled in.
1069          */
1070         if (   new.c_iflag == settings->main.c_iflag
1071             && new.c_oflag == settings->main.c_oflag
1072             && new.c_cflag == settings->main.c_cflag
1073             && new.c_lflag == settings->main.c_lflag
1074             && memcmp(new.c_cc, settings->main.c_cc, NCCS) == 0)
1075           break;
1076         else
1077           continue;
1078       }
1079
1080 #else
1081 #ifdef HAVE_TERMIO
1082   /* The SYSV-style interface?  */
1083   if (ioctl (fd, waitp ? TCSETAW : TCSETAF, &settings->main) < 0)
1084     return -1;
1085
1086 #else
1087 #ifdef VMS
1088   /* Vehemently Monstrous System?  :-)  */
1089   if (! (SYS$QIOW (0, fd, IO$_SETMODE, &input_iosb, 0, 0,
1090                    &settings->main.class, 12, 0, 0, 0, 0)
1091          & 1))
1092     return -1;
1093
1094 #else
1095 #ifndef DOS_NT
1096   /* I give up - I hope you have the BSD ioctls.  */
1097   if (ioctl (fd, (waitp) ? TIOCSETP : TIOCSETN, &settings->main) < 0)
1098     return -1;
1099 #endif /* not DOS_NT */
1100
1101 #endif
1102 #endif
1103 #endif
1104
1105   /* Suivant - Do we have to get struct ltchars data?  */
1106 #ifdef HAVE_LTCHARS
1107   if (ioctl (fd, TIOCSLTC, &settings->ltchars) < 0)
1108     return -1;
1109 #endif
1110
1111   /* How about a struct tchars and a wordful of lmode bits?  */
1112 #ifdef HAVE_TCHARS
1113   if (ioctl (fd, TIOCSETC, &settings->tchars) < 0
1114       || ioctl (fd, TIOCLSET, &settings->lmode) < 0)
1115     return -1;
1116 #endif
1117
1118   /* We have survived the tempest.  */
1119   return 0;
1120 }
1121
1122 \f
1123 /* The initial tty mode bits */
1124 struct emacs_tty old_tty;
1125
1126 int term_initted;               /* 1 if outer tty status has been recorded */
1127
1128 #ifdef BSD4_1
1129 /* BSD 4.1 needs to keep track of the lmode bits in order to start
1130    sigio.  */
1131 int lmode;
1132 #endif
1133
1134 #ifndef F_SETOWN_BUG
1135 #ifdef F_SETOWN
1136 int old_fcntl_owner;
1137 #endif /* F_SETOWN */
1138 #endif /* F_SETOWN_BUG */
1139
1140 /* This may also be defined in stdio,
1141    but if so, this does no harm,
1142    and using the same name avoids wasting the other one's space.  */
1143
1144 #if defined (USG) || defined (DGUX)
1145 unsigned char _sobuf[BUFSIZ+8];
1146 #else
1147 char _sobuf[BUFSIZ];
1148 #endif
1149
1150 #ifdef HAVE_LTCHARS
1151 static struct ltchars new_ltchars = {-1,-1,-1,-1,-1,-1};
1152 #endif
1153 #ifdef HAVE_TCHARS
1154   static struct tchars new_tchars = {-1,-1,-1,-1,-1,-1};
1155 #endif
1156
1157 init_sys_modes ()
1158 {
1159   struct emacs_tty tty;
1160
1161 #ifdef VMS
1162 #if 0
1163   static int oob_chars[2] = {0, 1 << 7}; /* catch C-g's */
1164   extern int (*interrupt_signal) ();
1165 #endif
1166 #endif
1167
1168   if (noninteractive)
1169     return;
1170
1171 #ifdef VMS
1172   if (!input_ef)
1173     input_ef = get_kbd_event_flag ();
1174     /* LIB$GET_EF (&input_ef); */
1175   SYS$CLREF (input_ef);
1176   waiting_for_ast = 0;
1177   if (!timer_ef)
1178     timer_ef = get_timer_event_flag ();
1179     /* LIB$GET_EF (&timer_ef); */
1180   SYS$CLREF (timer_ef);
1181 #if 0
1182   if (!process_ef)
1183     {
1184       LIB$GET_EF (&process_ef);
1185       SYS$CLREF (process_ef);
1186     }
1187   if (input_ef / 32 != process_ef / 32)
1188     croak ("Input and process event flags in different clusters.");
1189 #endif
1190   if (input_ef / 32 != timer_ef / 32)
1191     croak ("Input and timer event flags in different clusters.");
1192 #if 0
1193   input_eflist = ((unsigned) 1 << (input_ef % 32)) |
1194     ((unsigned) 1 << (process_ef % 32));
1195 #endif
1196   timer_eflist = ((unsigned) 1 << (input_ef % 32)) |
1197     ((unsigned) 1 << (timer_ef % 32));
1198 #ifndef VMS4_4
1199   sys_access_reinit ();
1200 #endif
1201 #endif /* not VMS */
1202
1203 #ifdef BSD_PGRPS
1204   if (! read_socket_hook && EQ (Vwindow_system, Qnil))
1205     narrow_foreground_group ();
1206 #endif
1207
1208 #ifdef HAVE_X_WINDOWS
1209   /* Emacs' window system on MSDOG uses the `internal terminal' and therefore
1210      needs the initialization code below.  */
1211   if (!read_socket_hook && EQ (Vwindow_system, Qnil))
1212 #endif
1213     {
1214       EMACS_GET_TTY (input_fd, &old_tty);
1215
1216       tty = old_tty;
1217
1218 #if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
1219 #ifdef DGUX
1220       /* This allows meta to be sent on 8th bit.  */
1221       tty.main.c_iflag &= ~INPCK;       /* don't check input for parity */
1222 #endif
1223       tty.main.c_iflag |= (IGNBRK);     /* Ignore break condition */
1224       tty.main.c_iflag &= ~ICRNL;       /* Disable map of CR to NL on input */
1225 #ifdef ISTRIP
1226       tty.main.c_iflag &= ~ISTRIP;      /* don't strip 8th bit on input */
1227 #endif
1228       tty.main.c_lflag &= ~ECHO;        /* Disable echo */
1229       tty.main.c_lflag &= ~ICANON;      /* Disable erase/kill processing */
1230 #ifdef IEXTEN
1231       tty.main.c_lflag &= ~IEXTEN;      /* Disable other editing characters.  */
1232 #endif
1233       tty.main.c_lflag |= ISIG; /* Enable signals */
1234       if (flow_control)
1235         {
1236           tty.main.c_iflag |= IXON;     /* Enable start/stop output control */
1237 #ifdef IXANY
1238           tty.main.c_iflag &= ~IXANY;
1239 #endif /* IXANY */
1240         }
1241       else
1242         tty.main.c_iflag &= ~IXON;      /* Disable start/stop output control */
1243       tty.main.c_oflag &= ~ONLCR;       /* Disable map of NL to CR-NL
1244                                            on output */
1245       tty.main.c_oflag &= ~TAB3;        /* Disable tab expansion */
1246 #ifdef CS8
1247       if (meta_key)
1248         {
1249           tty.main.c_cflag |= CS8;      /* allow 8th bit on input */
1250           tty.main.c_cflag &= ~PARENB;/* Don't check parity */
1251         }
1252 #endif
1253       tty.main.c_cc[VINTR] = quit_char; /* C-g (usually) gives SIGINT */
1254       /* Set up C-g for both SIGQUIT and SIGINT.
1255          We don't know which we will get, but we handle both alike
1256          so which one it really gives us does not matter.  */
1257       tty.main.c_cc[VQUIT] = quit_char;
1258       tty.main.c_cc[VMIN] = 1;  /* Input should wait for at least 1 char */
1259       tty.main.c_cc[VTIME] = 0; /* no matter how long that takes.  */
1260 #ifdef VSWTCH
1261       tty.main.c_cc[VSWTCH] = CDISABLE; /* Turn off shell layering use
1262                                            of C-z */
1263 #endif /* VSWTCH */
1264 #if defined (mips) || defined (HAVE_TCATTR)
1265 #ifdef VSUSP
1266       tty.main.c_cc[VSUSP] = CDISABLE;  /* Turn off mips handling of C-z.  */
1267 #endif /* VSUSP */
1268 #ifdef V_DSUSP
1269       tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off mips handling of C-y.  */
1270 #endif /* V_DSUSP */
1271 #ifdef VDSUSP /* Some systems have VDSUSP, some have V_DSUSP.  */
1272       tty.main.c_cc[VDSUSP] = CDISABLE;
1273 #endif /* VDSUSP */
1274 #ifdef VLNEXT
1275       tty.main.c_cc[VLNEXT] = CDISABLE;
1276 #endif /* VLNEXT */
1277 #ifdef VREPRINT
1278       tty.main.c_cc[VREPRINT] = CDISABLE;
1279 #endif /* VREPRINT */
1280 #ifdef VWERASE
1281       tty.main.c_cc[VWERASE] = CDISABLE;
1282 #endif /* VWERASE */
1283 #ifdef VDISCARD
1284       tty.main.c_cc[VDISCARD] = CDISABLE;
1285 #endif /* VDISCARD */
1286 #ifdef VSTART
1287       tty.main.c_cc[VSTART] = CDISABLE;
1288 #endif /* VSTART */
1289 #ifdef VSTOP
1290       tty.main.c_cc[VSTOP] = CDISABLE;
1291 #endif /* VSTOP */
1292 #endif /* mips or HAVE_TCATTR */
1293 #ifdef SET_LINE_DISCIPLINE
1294       /* Need to explicitely request TERMIODISC line discipline or
1295          Ultrix's termios does not work correctly.  */
1296       tty.main.c_line = SET_LINE_DISCIPLINE;
1297 #endif
1298 #ifdef AIX
1299 #ifndef IBMR2AIX
1300       /* AIX enhanced edit loses NULs, so disable it.  */
1301       tty.main.c_line = 0;
1302       tty.main.c_iflag &= ~ASCEDIT;
1303 #else
1304       tty.main.c_cc[VSTRT] = 255;
1305       tty.main.c_cc[VSTOP] = 255;
1306       tty.main.c_cc[VSUSP] = 255;
1307       tty.main.c_cc[VDSUSP] = 255;
1308 #endif /* IBMR2AIX */
1309       /* Also, PTY overloads NUL and BREAK.
1310          don't ignore break, but don't signal either, so it looks like NUL.
1311          This really serves a purpose only if running in an XTERM window
1312          or via TELNET or the like, but does no harm elsewhere.  */
1313       tty.main.c_iflag &= ~IGNBRK;
1314       tty.main.c_iflag &= ~BRKINT;
1315 #endif
1316 #else /* if not HAVE_TERMIO */
1317 #ifdef VMS
1318       tty.main.tt_char |= TT$M_NOECHO;
1319       if (meta_key)
1320         tty.main.tt_char |= TT$M_EIGHTBIT;
1321       if (flow_control)
1322         tty.main.tt_char |= TT$M_TTSYNC;
1323       else
1324         tty.main.tt_char &= ~TT$M_TTSYNC;
1325       tty.main.tt2_char |= TT2$M_PASTHRU | TT2$M_XON;
1326 #else /* not VMS (BSD, that is) */
1327 #ifndef DOS_NT
1328       tty.main.sg_flags &= ~(ECHO | CRMOD | XTABS);
1329       if (meta_key)
1330         tty.main.sg_flags |= ANYP;
1331       tty.main.sg_flags |= interrupt_input ? RAW : CBREAK;
1332 #endif /* not DOS_NT */
1333 #endif /* not VMS (BSD, that is) */
1334 #endif /* not HAVE_TERMIO */
1335
1336       /* If going to use CBREAK mode, we must request C-g to interrupt
1337          and turn off start and stop chars, etc.  If not going to use
1338          CBREAK mode, do this anyway so as to turn off local flow
1339          control for user coming over network on 4.2; in this case,
1340          only t_stopc and t_startc really matter.  */
1341 #ifndef HAVE_TERMIO
1342 #ifdef HAVE_TCHARS
1343       /* Note: if not using CBREAK mode, it makes no difference how we
1344          set this */
1345       tty.tchars = new_tchars;
1346       tty.tchars.t_intrc = quit_char;
1347       if (flow_control)
1348         {
1349           tty.tchars.t_startc = '\021';
1350           tty.tchars.t_stopc = '\023';
1351         }
1352
1353       tty.lmode = LDECCTQ | LLITOUT | LPASS8 | LNOFLSH | old_tty.lmode;
1354 #ifdef ultrix
1355       /* Under Ultrix 4.2a, leaving this out doesn't seem to hurt
1356          anything, and leaving it in breaks the meta key.  Go figure.  */
1357       tty.lmode &= ~LLITOUT;
1358 #endif
1359
1360 #ifdef BSD4_1
1361       lmode = tty.lmode;
1362 #endif
1363
1364 #endif /* HAVE_TCHARS */
1365 #endif /* not HAVE_TERMIO */
1366
1367 #ifdef HAVE_LTCHARS
1368       tty.ltchars = new_ltchars;
1369 #endif /* HAVE_LTCHARS */
1370 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
1371       if (!term_initted)
1372         internal_terminal_init ();
1373       dos_ttraw ();
1374 #endif
1375
1376       EMACS_SET_TTY (input_fd, &tty, 0);
1377
1378       /* This code added to insure that, if flow-control is not to be used,
1379          we have an unlocked terminal at the start. */
1380
1381 #ifdef TCXONC
1382       if (!flow_control) ioctl (input_fd, TCXONC, 1);
1383 #endif
1384 #ifndef APOLLO
1385 #ifdef TIOCSTART
1386       if (!flow_control) ioctl (input_fd, TIOCSTART, 0);
1387 #endif
1388 #endif
1389
1390 #if defined (HAVE_TERMIOS) || defined (HPUX9)
1391       if (!flow_control) tcflow (input_fd, TCOON);
1392 #endif
1393
1394 #ifdef AIXHFT
1395       hft_init ();
1396 #ifdef IBMR2AIX
1397       {
1398         /* IBM's HFT device usually thinks a ^J should be LF/CR.  We need it
1399            to be only LF.  This is the way that is done. */
1400         struct termio tty;
1401
1402         if (ioctl (1, HFTGETID, &tty) != -1)
1403           write (1, "\033[20l", 5);
1404       }
1405 #endif
1406 #endif /* AIXHFT */
1407
1408 #ifdef VMS
1409 /*  Appears to do nothing when in PASTHRU mode.
1410       SYS$QIOW (0, input_fd, IO$_SETMODE|IO$M_OUTBAND, 0, 0, 0,
1411                 interrupt_signal, oob_chars, 0, 0, 0, 0);
1412 */
1413       queue_kbd_input (0);
1414 #endif /* VMS */
1415     }
1416
1417 #ifdef F_SETFL
1418 #ifndef F_SETOWN_BUG
1419 #ifdef F_GETOWN         /* F_SETFL does not imply existence of F_GETOWN */
1420   if (interrupt_input
1421       && ! read_socket_hook && EQ (Vwindow_system, Qnil))
1422     {
1423       old_fcntl_owner = fcntl (input_fd, F_GETOWN, 0);
1424       fcntl (input_fd, F_SETOWN, getpid ());
1425       init_sigio (input_fd);
1426     }
1427 #endif /* F_GETOWN */
1428 #endif /* F_SETOWN_BUG */
1429 #endif /* F_SETFL */
1430
1431 #ifdef BSD4_1
1432   if (interrupt_input)
1433     init_sigio (input_fd);
1434 #endif
1435
1436 #ifdef VMS  /* VMS sometimes has this symbol but lacks setvbuf.  */
1437 #undef _IOFBF
1438 #endif
1439 #ifdef _IOFBF
1440   /* This symbol is defined on recent USG systems.
1441      Someone says without this call USG won't really buffer the file
1442      even with a call to setbuf. */
1443   setvbuf (stdout, _sobuf, _IOFBF, sizeof _sobuf);
1444 #else
1445   setbuf (stdout, _sobuf);
1446 #endif
1447   if (! read_socket_hook && EQ (Vwindow_system, Qnil))
1448     set_terminal_modes ();
1449
1450   if (term_initted && no_redraw_on_reenter)
1451     {
1452       if (display_completed)
1453         direct_output_forward_char (0);
1454     }
1455   else
1456     {
1457       frame_garbaged = 1;
1458 #ifdef MULTI_FRAME
1459       if (FRAMEP (Vterminal_frame))
1460         FRAME_GARBAGED_P (XFRAME (Vterminal_frame)) = 1;
1461 #endif
1462     }
1463
1464   term_initted = 1;
1465 }
1466
1467 /* Return nonzero if safe to use tabs in output.
1468    At the time this is called, init_sys_modes has not been done yet.  */
1469
1470 tabs_safe_p ()
1471 {
1472   struct emacs_tty tty;
1473
1474   EMACS_GET_TTY (input_fd, &tty);
1475   return EMACS_TTY_TABS_OK (&tty);
1476 }
1477 \f
1478 /* Get terminal size from system.
1479    Store number of lines into *HEIGHTP and width into *WIDTHP.
1480    We store 0 if there's no valid information.  */
1481
1482 get_frame_size (widthp, heightp)
1483      int *widthp, *heightp;
1484 {
1485
1486 #ifdef TIOCGWINSZ
1487
1488   /* BSD-style.  */
1489   struct winsize size;
1490
1491   if (ioctl (input_fd, TIOCGWINSZ, &size) == -1)
1492     *widthp = *heightp = 0;
1493   else
1494     {
1495       *widthp = size.ws_col;
1496       *heightp = size.ws_row;
1497     }
1498
1499 #else
1500 #ifdef TIOCGSIZE
1501
1502   /* SunOS - style.  */
1503   struct ttysize size;
1504
1505   if (ioctl (input_fd, TIOCGSIZE, &size) == -1)
1506     *widthp = *heightp = 0;
1507   else
1508     {
1509       *widthp = size.ts_cols;
1510       *heightp = size.ts_lines;
1511     }
1512
1513 #else
1514 #ifdef VMS
1515
1516   struct sensemode tty;
1517
1518   SYS$QIOW (0, input_fd, IO$_SENSEMODE, &tty, 0, 0,
1519             &tty.class, 12, 0, 0, 0, 0);
1520   *widthp = tty.scr_wid;
1521   *heightp = tty.scr_len;
1522
1523 #else
1524 #ifdef MSDOS
1525   *widthp = ScreenCols ();
1526   *heightp = ScreenRows ();
1527 #else /* system doesn't know size */
1528   *widthp = 0;
1529   *heightp = 0;
1530 #endif
1531
1532 #endif /* not VMS */
1533 #endif /* not SunOS-style */
1534 #endif /* not BSD-style */
1535 }
1536
1537 /* Set the logical window size associated with descriptor FD
1538    to HEIGHT and WIDTH.  This is used mainly with ptys.  */
1539
1540 int
1541 set_window_size (fd, height, width)
1542      int fd, height, width;
1543 {
1544 #ifdef TIOCSWINSZ
1545
1546   /* BSD-style.  */
1547   struct winsize size;
1548   size.ws_row = height;
1549   size.ws_col = width;
1550
1551   if (ioctl (fd, TIOCSWINSZ, &size) == -1)
1552     return 0; /* error */
1553   else
1554     return 1;
1555
1556 #else
1557 #ifdef TIOCSSIZE
1558
1559   /* SunOS - style.  */
1560   struct ttysize size;
1561   size.ts_lines = height;
1562   size.ts_cols = width;
1563
1564   if (ioctl (fd, TIOCGSIZE, &size) == -1)
1565     return 0;
1566   else
1567     return 1;
1568 #else
1569   return -1;
1570 #endif /* not SunOS-style */
1571 #endif /* not BSD-style */
1572 }
1573
1574 \f
1575 /* Prepare the terminal for exiting Emacs; move the cursor to the
1576    bottom of the frame, turn off interrupt-driven I/O, etc.  */
1577 reset_sys_modes ()
1578 {
1579   if (noninteractive)
1580     {
1581       fflush (stdout);
1582       return;
1583     }
1584   if (!term_initted)
1585     return;
1586 #ifdef HAVE_X_WINDOWS
1587   /* Emacs' window system on MSDOG uses the `internal terminal' and therefore
1588      needs the clean-up code below.  */
1589   if (read_socket_hook || !EQ (Vwindow_system, Qnil))
1590     return;
1591 #endif
1592   cursor_to (FRAME_HEIGHT (selected_frame) - 1, 0);
1593 #ifdef MSDOS
1594   if (!EQ (Vwindow_system, Qnil))
1595     {
1596       /* Change to grey on white.  */
1597       putchar ('\e');
1598       putchar ('A');
1599       putchar (7);
1600     }
1601 #endif
1602   clear_end_of_line (FRAME_WIDTH (selected_frame));
1603   /* clear_end_of_line may move the cursor */
1604   cursor_to (FRAME_HEIGHT (selected_frame) - 1, 0);
1605 #if defined (IBMR2AIX) && defined (AIXHFT)
1606   {
1607     /* HFT devices normally use ^J as a LF/CR.  We forced it to
1608        do the LF only.  Now, we need to reset it. */
1609     struct termio tty;
1610
1611     if (ioctl (1, HFTGETID, &tty) != -1)
1612       write (1, "\033[20h", 5);
1613   }
1614 #endif
1615
1616   reset_terminal_modes ();
1617   fflush (stdout);
1618 #ifdef BSD
1619 #ifndef BSD4_1
1620   /* Avoid possible loss of output when changing terminal modes.  */
1621   fsync (fileno (stdout));
1622 #endif
1623 #endif
1624
1625 #ifdef F_SETFL
1626 #ifndef F_SETOWN_BUG
1627 #ifdef F_SETOWN         /* F_SETFL does not imply existence of F_SETOWN */
1628   if (interrupt_input)
1629     {
1630       reset_sigio ();
1631       fcntl (input_fd, F_SETOWN, old_fcntl_owner);
1632     }
1633 #endif /* F_SETOWN */
1634 #endif /* F_SETOWN_BUG */
1635 #ifdef O_NDELAY
1636   fcntl (input_fd, F_SETFL, fcntl (input_fd, F_GETFL, 0) & ~O_NDELAY);
1637 #endif
1638 #endif /* F_SETFL */
1639 #ifdef BSD4_1
1640   if (interrupt_input)
1641     reset_sigio ();
1642 #endif /* BSD4_1 */
1643
1644   while (EMACS_SET_TTY (input_fd, &old_tty, 0) < 0 && errno == EINTR)
1645     ;
1646
1647 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
1648   dos_ttcooked ();
1649 #endif
1650
1651 #ifdef SET_LINE_DISCIPLINE
1652   /* Ultrix's termios *ignores* any line discipline except TERMIODISC.
1653      A different old line discipline is therefore not restored, yet.
1654      Restore the old line discipline by hand.  */
1655   ioctl (0, TIOCSETD, &old_tty.main.c_line);
1656 #endif
1657
1658 #ifdef AIXHFT
1659   hft_reset ();
1660 #endif
1661
1662 #ifdef BSD_PGRPS
1663   widen_foreground_group ();
1664 #endif
1665 }
1666 \f
1667 #ifdef HAVE_PTYS
1668
1669 /* Set up the proper status flags for use of a pty.  */
1670
1671 setup_pty (fd)
1672      int fd;
1673 {
1674   /* I'm told that TOICREMOTE does not mean control chars
1675      "can't be sent" but rather that they don't have
1676      input-editing or signaling effects.
1677      That should be good, because we have other ways
1678      to do those things in Emacs.
1679      However, telnet mode seems not to work on 4.2.
1680      So TIOCREMOTE is turned off now. */
1681
1682   /* Under hp-ux, if TIOCREMOTE is turned on, some calls
1683      will hang.  In particular, the "timeout" feature (which
1684      causes a read to return if there is no data available)
1685      does this.  Also it is known that telnet mode will hang
1686      in such a way that Emacs must be stopped (perhaps this
1687      is the same problem).
1688
1689      If TIOCREMOTE is turned off, then there is a bug in
1690      hp-ux which sometimes loses data.  Apparently the
1691      code which blocks the master process when the internal
1692      buffer fills up does not work.  Other than this,
1693      though, everything else seems to work fine.
1694
1695      Since the latter lossage is more benign, we may as well
1696      lose that way.  -- cph */
1697 #ifdef FIONBIO
1698 #ifdef SYSV_PTYS
1699   {
1700     int on = 1;
1701     ioctl (fd, FIONBIO, &on);
1702   }
1703 #endif
1704 #endif
1705 #ifdef IBMRTAIX
1706   /* On AIX, the parent gets SIGHUP when a pty attached child dies.  So, we */
1707   /* ignore SIGHUP once we've started a child on a pty.  Note that this may */
1708   /* cause EMACS not to die when it should, i.e., when its own controlling  */
1709   /* tty goes away.  I've complained to the AIX developers, and they may    */
1710   /* change this behavior, but I'm not going to hold my breath.             */
1711   signal (SIGHUP, SIG_IGN);
1712 #endif
1713 }
1714 #endif /* HAVE_PTYS */
1715 \f
1716 #ifdef VMS
1717
1718 /* Assigning an input channel is done at the start of Emacs execution.
1719    This is called each time Emacs is resumed, also, but does nothing
1720    because input_chain is no longer zero.  */
1721
1722 init_vms_input ()
1723 {
1724   int status;
1725
1726   if (input_fd == 0)
1727     {
1728       status = SYS$ASSIGN (&input_dsc, &input_fd, 0, 0);
1729       if (! (status & 1))
1730         LIB$STOP (status);
1731     }
1732 }
1733
1734 /* Deassigning the input channel is done before exiting.  */
1735
1736 stop_vms_input ()
1737 {
1738   return SYS$DASSGN (input_fd);
1739 }
1740
1741 short input_buffer;
1742
1743 /* Request reading one character into the keyboard buffer.
1744    This is done as soon as the buffer becomes empty.  */
1745
1746 queue_kbd_input ()
1747 {
1748   int status;
1749   extern kbd_input_ast ();
1750
1751   waiting_for_ast = 0;
1752   stop_input = 0;
1753   status = SYS$QIO (0, input_fd, IO$_READVBLK,
1754                     &input_iosb, kbd_input_ast, 1,
1755                     &input_buffer, 1, 0, terminator_mask, 0, 0);
1756 }
1757
1758 int input_count;
1759
1760 /* Ast routine that is called when keyboard input comes in
1761    in accord with the SYS$QIO above.  */
1762
1763 kbd_input_ast ()
1764 {
1765   register int c = -1;
1766   int old_errno = errno;
1767   extern EMACS_TIME *input_available_clear_time;
1768
1769   if (waiting_for_ast)
1770     SYS$SETEF (input_ef);
1771   waiting_for_ast = 0;
1772   input_count++;
1773 #ifdef ASTDEBUG
1774   if (input_count == 25)
1775     exit (1);
1776   printf ("Ast # %d,", input_count);
1777   printf (" iosb = %x, %x, %x, %x",
1778           input_iosb.offset, input_iosb.status, input_iosb.termlen,
1779           input_iosb.term);
1780 #endif
1781   if (input_iosb.offset)
1782     {
1783       c = input_buffer;
1784 #ifdef ASTDEBUG
1785       printf (", char = 0%o", c);
1786 #endif
1787     }
1788 #ifdef ASTDEBUG
1789   printf ("\n");
1790   fflush (stdout);
1791   sleep (1);
1792 #endif
1793   if (! stop_input)
1794     queue_kbd_input ();
1795   if (c >= 0)
1796     {
1797       struct input_event e;
1798       e.kind = ascii_keystroke;
1799       XSETINT (e.code, c);
1800       XSETFRAME (e.frame_or_window, selected_frame);
1801       kbd_buffer_store_event (&e);
1802     }
1803   if (input_available_clear_time)
1804     EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0);
1805   errno = old_errno;
1806 }
1807
1808 /* Wait until there is something in kbd_buffer.  */
1809
1810 wait_for_kbd_input ()
1811 {
1812   extern int have_process_input, process_exited;
1813
1814   /* If already something, avoid doing system calls.  */
1815   if (detect_input_pending ())
1816     {
1817       return;
1818     }
1819   /* Clear a flag, and tell ast routine above to set it.  */
1820   SYS$CLREF (input_ef);
1821   waiting_for_ast = 1;
1822   /* Check for timing error: ast happened while we were doing that.  */
1823   if (!detect_input_pending ())
1824     {
1825       /* No timing error: wait for flag to be set.  */
1826       set_waiting_for_input (0);
1827       SYS$WFLOR (input_ef, input_eflist);
1828       clear_waiting_for_input (0);
1829       if (!detect_input_pending ())
1830         /* Check for subprocess input availability */
1831         {
1832           int dsp = have_process_input || process_exited;
1833
1834           SYS$CLREF (process_ef);
1835           if (have_process_input)
1836             process_command_input ();
1837           if (process_exited)
1838             process_exit ();
1839           if (dsp)
1840             {
1841               update_mode_lines++;
1842               prepare_menu_bars ();
1843               redisplay_preserve_echo_area ();
1844             }
1845         }
1846     }
1847   waiting_for_ast = 0;
1848 }
1849
1850 /* Get rid of any pending QIO, when we are about to suspend
1851    or when we want to throw away pending input.
1852    We wait for a positive sign that the AST routine has run
1853    and therefore there is no I/O request queued when we return.
1854    SYS$SETAST is used to avoid a timing error.  */
1855
1856 end_kbd_input ()
1857 {
1858 #ifdef ASTDEBUG
1859   printf ("At end_kbd_input.\n");
1860   fflush (stdout);
1861   sleep (1);
1862 #endif
1863   if (LIB$AST_IN_PROG ())  /* Don't wait if suspending from kbd_buffer_store_event! */
1864     {
1865       SYS$CANCEL (input_fd);
1866       return;
1867     }
1868
1869   SYS$SETAST (0);
1870   /* Clear a flag, and tell ast routine above to set it.  */
1871   SYS$CLREF (input_ef);
1872   waiting_for_ast = 1;
1873   stop_input = 1;
1874   SYS$CANCEL (input_fd);
1875   SYS$SETAST (1);
1876   SYS$WAITFR (input_ef);
1877   waiting_for_ast = 0;
1878 }
1879
1880 /* Wait for either input available or time interval expiry.  */
1881
1882 input_wait_timeout (timeval)
1883      int timeval;               /* Time to wait, in seconds */
1884 {
1885   int time [2];
1886   static int zero = 0;
1887   static int large = -10000000;
1888
1889   LIB$EMUL (&timeval, &large, &zero, time);       /* Convert to VMS format */
1890
1891   /* If already something, avoid doing system calls.  */
1892   if (detect_input_pending ())
1893     {
1894       return;
1895     }
1896   /* Clear a flag, and tell ast routine above to set it.  */
1897   SYS$CLREF (input_ef);
1898   waiting_for_ast = 1;
1899   /* Check for timing error: ast happened while we were doing that.  */
1900   if (!detect_input_pending ())
1901     {
1902       /* No timing error: wait for flag to be set.  */
1903       SYS$CANTIM (1, 0);
1904       if (SYS$SETIMR (timer_ef, time, 0, 1) & 1) /* Set timer */
1905         SYS$WFLOR (timer_ef, timer_eflist);       /* Wait for timer expiry or input */
1906     }
1907   waiting_for_ast = 0;
1908 }
1909
1910 /* The standard `sleep' routine works some other way
1911    and it stops working if you have ever quit out of it.
1912    This one continues to work.  */
1913
1914 sys_sleep (timeval)
1915      int timeval;
1916 {
1917   int time [2];
1918   static int zero = 0;
1919   static int large = -10000000;
1920
1921   LIB$EMUL (&timeval, &large, &zero, time);       /* Convert to VMS format */
1922
1923   SYS$CANTIM (1, 0);
1924   if (SYS$SETIMR (timer_ef, time, 0, 1) & 1) /* Set timer */
1925     SYS$WAITFR (timer_ef);        /* Wait for timer expiry only */
1926 }
1927
1928 init_sigio (fd)
1929      int fd;
1930 {
1931   request_sigio ();
1932 }
1933
1934 reset_sigio ()
1935 {
1936   unrequest_sigio ();
1937 }
1938
1939 request_sigio ()
1940 {
1941   croak ("request sigio");
1942 }
1943
1944 unrequest_sigio ()
1945 {
1946   croak ("unrequest sigio");
1947 }
1948
1949 #endif /* VMS */
1950 \f
1951 /* Note that VMS compiler won't accept defined (CANNOT_DUMP).  */
1952 #ifndef CANNOT_DUMP
1953 #define NEED_STARTS
1954 #endif
1955
1956 #ifndef SYSTEM_MALLOC
1957 #ifndef NEED_STARTS
1958 #define NEED_STARTS
1959 #endif
1960 #endif
1961
1962 #ifdef NEED_STARTS
1963 /* Some systems that cannot dump also cannot implement these.  */
1964
1965 /*
1966  *      Return the address of the start of the text segment prior to
1967  *      doing an unexec.  After unexec the return value is undefined.
1968  *      See crt0.c for further explanation and _start.
1969  *
1970  */
1971
1972 #ifndef HAVE_TEXT_START
1973 char *
1974 start_of_text ()
1975 {
1976 #ifdef TEXT_START
1977   return ((char *) TEXT_START);
1978 #else
1979 #ifdef GOULD
1980   extern csrt ();
1981   return ((char *) csrt);
1982 #else /* not GOULD */
1983   extern int _start ();
1984   return ((char *) _start);
1985 #endif /* GOULD */
1986 #endif /* TEXT_START */
1987 }
1988 #endif /* not HAVE_TEXT_START */
1989
1990 /*
1991  *      Return the address of the start of the data segment prior to
1992  *      doing an unexec.  After unexec the return value is undefined.
1993  *      See crt0.c for further information and definition of data_start.
1994  *
1995  *      Apparently, on BSD systems this is etext at startup.  On
1996  *      USG systems (swapping) this is highly mmu dependent and
1997  *      is also dependent on whether or not the program is running
1998  *      with shared text.  Generally there is a (possibly large)
1999  *      gap between end of text and start of data with shared text.
2000  *
2001  *      On Uniplus+ systems with shared text, data starts at a
2002  *      fixed address.  Each port (from a given oem) is generally
2003  *      different, and the specific value of the start of data can
2004  *      be obtained via the UniPlus+ specific "uvar" system call,
2005  *      however the method outlined in crt0.c seems to be more portable.
2006  *
2007  *      Probably what will have to happen when a USG unexec is available,
2008  *      at least on UniPlus, is temacs will have to be made unshared so
2009  *      that text and data are contiguous.  Then once loadup is complete,
2010  *      unexec will produce a shared executable where the data can be
2011  *      at the normal shared text boundry and the startofdata variable
2012  *      will be patched by unexec to the correct value.
2013  *
2014  */
2015
2016 char *
2017 start_of_data ()
2018 {
2019 #ifdef DATA_START
2020   return ((char *) DATA_START);
2021 #else
2022 #ifdef ORDINARY_LINK
2023   /*
2024    * This is a hack.  Since we're not linking crt0.c or pre_crt0.c,
2025    * data_start isn't defined.  We take the address of environ, which
2026    * is known to live at or near the start of the system crt0.c, and
2027    * we don't sweat the handful of bytes that might lose.
2028    */
2029   extern char **environ;
2030
2031   return((char *) &environ);
2032 #else
2033   extern int data_start;
2034   return ((char *) &data_start);
2035 #endif /* ORDINARY_LINK */
2036 #endif /* DATA_START */
2037 }
2038 #endif /* NEED_STARTS (not CANNOT_DUMP or not SYSTEM_MALLOC) */
2039
2040 #ifndef CANNOT_DUMP
2041 /* Some systems that cannot dump also cannot implement these.  */
2042
2043 /*
2044  *      Return the address of the end of the text segment prior to
2045  *      doing an unexec.  After unexec the return value is undefined.
2046  */
2047
2048 char *
2049 end_of_text ()
2050 {
2051 #ifdef TEXT_END
2052   return ((char *) TEXT_END);
2053 #else
2054   extern int etext;
2055   return ((char *) &etext);
2056 #endif
2057 }
2058
2059 /*
2060  *      Return the address of the end of the data segment prior to
2061  *      doing an unexec.  After unexec the return value is undefined.
2062  */
2063
2064 char *
2065 end_of_data ()
2066 {
2067 #ifdef DATA_END
2068   return ((char *) DATA_END);
2069 #else
2070   extern int edata;
2071   return ((char *) &edata);
2072 #endif
2073 }
2074
2075 #endif /* not CANNOT_DUMP */
2076 \f
2077 /* init_system_name sets up the string for the Lisp function
2078    system-name to return. */
2079
2080 #ifdef BSD4_1
2081 #include <whoami.h>
2082 #endif
2083
2084 extern Lisp_Object Vsystem_name;
2085
2086 #ifndef BSD4_1
2087 #ifndef VMS
2088 #ifdef HAVE_SOCKETS
2089 #include <sys/socket.h>
2090 #include <netdb.h>
2091 #endif /* HAVE_SOCKETS */
2092 #endif /* not VMS */
2093 #endif /* not BSD4_1 */
2094
2095 void
2096 init_system_name ()
2097 {
2098 #ifdef BSD4_1
2099   Vsystem_name = build_string (sysname);
2100 #else
2101 #ifdef VMS
2102   char *sp, *end;
2103   if ((sp = egetenv ("SYS$NODE")) == 0)
2104     Vsystem_name = build_string ("vax-vms");
2105   else if ((end = index (sp, ':')) == 0)
2106     Vsystem_name = build_string (sp);
2107   else
2108     Vsystem_name = make_string (sp, end - sp);
2109 #else
2110 #ifndef HAVE_GETHOSTNAME
2111   struct utsname uts;
2112   uname (&uts);
2113   Vsystem_name = build_string (uts.nodename);
2114 #else /* HAVE_GETHOSTNAME */
2115   int hostname_size = 256;
2116   char *hostname = (char *) alloca (hostname_size);
2117
2118   /* Try to get the host name; if the buffer is too short, try
2119      again.  Apparently, the only indication gethostname gives of
2120      whether the buffer was large enough is the presence or absence
2121      of a '\0' in the string.  Eech.  */
2122   for (;;)
2123     {
2124       gethostname (hostname, hostname_size - 1);
2125       hostname[hostname_size - 1] = '\0';
2126
2127       /* Was the buffer large enough for the '\0'?  */
2128       if (strlen (hostname) < hostname_size - 1)
2129         break;
2130
2131       hostname_size <<= 1;
2132       hostname = (char *) alloca (hostname_size);
2133     }
2134 #ifdef HAVE_SOCKETS
2135   /* Turn the hostname into the official, fully-qualified hostname.
2136      Don't do this if we're going to dump; this can confuse system
2137      libraries on some machines and make the dumped emacs core dump. */
2138 #ifndef CANNOT_DUMP
2139   if (initialized)
2140 #endif /* not CANNOT_DUMP */
2141     {
2142       struct hostent *hp;
2143       int count;
2144       for (count = 0; count < 10; count++)
2145         {
2146 #ifdef TRY_AGAIN
2147           h_errno = 0;
2148 #endif
2149           hp = gethostbyname (hostname);
2150 #ifdef TRY_AGAIN
2151           if (! (hp == 0 && h_errno == TRY_AGAIN))
2152 #endif
2153             break;
2154           Fsleep_for (make_number (1), Qnil);
2155         }
2156       if (hp)
2157         {
2158           char *fqdn = hp->h_name;
2159           char *p;
2160
2161           if (!index (fqdn, '.'))
2162             {
2163               /* We still don't have a fully qualified domain name.
2164                  Try to find one in the list of alternate names */
2165               char **alias = hp->h_aliases;
2166               while (*alias && !index (*alias, '.'))
2167                 alias++;
2168               if (*alias)
2169                 fqdn = *alias;
2170             }
2171           hostname = fqdn;
2172 #if 0
2173           /* Convert the host name to lower case.  */
2174           /* Using ctype.h here would introduce a possible locale
2175              dependence that is probably wrong for hostnames.  */
2176           p = hostname;
2177           while (*p)
2178             {
2179               if (*p >= 'A' && *p <= 'Z')
2180                 *p += 'a' - 'A';
2181               p++;
2182             }
2183 #endif
2184         }
2185     }
2186 #endif /* HAVE_SOCKETS */
2187   Vsystem_name = build_string (hostname);
2188 #endif /* HAVE_GETHOSTNAME */
2189 #endif /* VMS */
2190 #endif /* BSD4_1 */
2191   {
2192     unsigned char *p;
2193     for (p = XSTRING (Vsystem_name)->data; *p; p++)
2194       if (*p == ' ' || *p == '\t')
2195         *p = '-';
2196   }
2197 }
2198 \f
2199 #ifndef VMS
2200 #ifndef HAVE_SELECT
2201
2202 #ifdef HAVE_X_WINDOWS
2203 /* Cause explanatory error message at compile time,
2204    since the select emulation is not good enough for X.  */
2205 int *x = &x_windows_lose_if_no_select_system_call;
2206 #endif
2207
2208 /* Emulate as much as select as is possible under 4.1 and needed by Gnu Emacs
2209  * Only checks read descriptors.
2210  */
2211 /* How long to wait between checking fds in select */
2212 #define SELECT_PAUSE 1
2213 int select_alarmed;
2214
2215 /* For longjmp'ing back to read_input_waiting.  */
2216
2217 jmp_buf read_alarm_throw;
2218
2219 /* Nonzero if the alarm signal should throw back to read_input_waiting.
2220    The read_socket_hook function sets this to 1 while it is waiting.  */
2221
2222 int read_alarm_should_throw;
2223
2224 SIGTYPE
2225 select_alarm ()
2226 {
2227   select_alarmed = 1;
2228 #ifdef BSD4_1
2229   sigrelse (SIGALRM);
2230 #else /* not BSD4_1 */
2231   signal (SIGALRM, SIG_IGN);
2232 #endif /* not BSD4_1 */
2233   if (read_alarm_should_throw)
2234     longjmp (read_alarm_throw, 1);
2235 }
2236
2237 #ifndef WINDOWSNT
2238 /* Only rfds are checked.  */
2239 int
2240 select (nfds, rfds, wfds, efds, timeout)
2241      int nfds;
2242      int *rfds, *wfds, *efds, *timeout;
2243 {
2244   int ravail = 0, orfds = 0, old_alarm;
2245   int timeoutval = timeout ? *timeout : 100000;
2246   int *local_timeout = &timeoutval;
2247   extern int proc_buffered_char[];
2248 #ifndef subprocesses
2249   int process_tick = 0, update_tick = 0;
2250 #else
2251   extern int process_tick, update_tick;
2252 #endif
2253   SIGTYPE (*old_trap) ();
2254   unsigned char buf;
2255
2256   if (rfds)
2257     {
2258       orfds = *rfds;
2259       *rfds = 0;
2260     }
2261   if (wfds)
2262     *wfds = 0;
2263   if (efds)
2264     *efds = 0;
2265
2266   /* If we are looking only for the terminal, with no timeout,
2267      just read it and wait -- that's more efficient.  */
2268   if (orfds == 1 && *local_timeout == 100000 && process_tick == update_tick)
2269     {
2270       if (! detect_input_pending ())
2271         read_input_waiting ();
2272       *rfds = 1;
2273       return 1;
2274     }
2275
2276   /* Once a second, till the timer expires, check all the flagged read
2277    * descriptors to see if any input is available.  If there is some then
2278    * set the corresponding bit in the return copy of rfds.
2279    */
2280   while (1)
2281     {
2282       register int to_check, bit, fd;
2283
2284       if (rfds)
2285         {
2286           for (to_check = nfds, bit = 1, fd = 0; --to_check >= 0; bit <<= 1, fd++)
2287             {
2288               if (orfds & bit)
2289                 {
2290                   int avail = 0, status = 0;
2291
2292                   if (bit == 1)
2293                     avail = detect_input_pending (); /* Special keyboard handler */
2294                   else
2295                     {
2296 #ifdef FIONREAD
2297                       status = ioctl (fd, FIONREAD, &avail);
2298 #else /* no FIONREAD */
2299 #ifdef MSDOS
2300                       abort (); /* I don't think we need it.  */
2301 #else /* not MSDOS */
2302                       /* Hoping it will return -1 if nothing available
2303                          or 0 if all 0 chars requested are read.  */
2304                       if (proc_buffered_char[fd] >= 0)
2305                         avail = 1;
2306                       else
2307                         {
2308                           avail = read (fd, &buf, 1);
2309                           if (avail > 0)
2310                             proc_buffered_char[fd] = buf;
2311                         }
2312 #endif /* not MSDOS */
2313 #endif /* no FIONREAD */
2314                     }
2315                   if (status >= 0 && avail > 0)
2316                     {
2317                       (*rfds) |= bit;
2318                       ravail++;
2319                     }
2320                 }
2321             }
2322         }
2323       if (*local_timeout == 0 || ravail != 0 || process_tick != update_tick)
2324         break;
2325       old_alarm = alarm (0);
2326       old_trap = signal (SIGALRM, select_alarm);
2327       select_alarmed = 0;
2328       alarm (SELECT_PAUSE);
2329       /* Wait for a SIGALRM (or maybe a SIGTINT) */
2330       while (select_alarmed == 0 && *local_timeout != 0
2331              && process_tick == update_tick)
2332         {
2333 #ifdef MSDOS
2334           sleep_or_kbd_hit (SELECT_PAUSE, (orfds & 1) != 0);
2335           select_alarm ();
2336 #else /* not MSDOS */
2337           /* If we are interested in terminal input,
2338              wait by reading the terminal.
2339              That makes instant wakeup for terminal input at least.  */
2340           if (orfds & 1)
2341             {
2342               read_input_waiting ();
2343               if (detect_input_pending ())
2344                 select_alarmed = 1;
2345             }
2346           else
2347             pause ();
2348 #endif /* not MSDOS */
2349         }
2350       (*local_timeout) -= SELECT_PAUSE;
2351       /* Reset the old alarm if there was one */
2352       alarm (0);
2353       signal (SIGALRM, old_trap);
2354       if (old_alarm != 0)
2355         {
2356           /* Reset or forge an interrupt for the original handler. */
2357           old_alarm -= SELECT_PAUSE;
2358           if (old_alarm <= 0)
2359             kill (getpid (), SIGALRM); /* Fake an alarm with the orig' handler */
2360           else
2361             alarm (old_alarm);
2362         }
2363       if (*local_timeout == 0)  /* Stop on timer being cleared */
2364         break;
2365     }
2366   return ravail;
2367 }
2368 #endif /* not WINDOWSNT */
2369
2370 /* Read keyboard input into the standard buffer,
2371    waiting for at least one character.  */
2372
2373 /* Make all keyboard buffers much bigger when using X windows.  */
2374 #ifdef HAVE_X_WINDOWS
2375 #define BUFFER_SIZE_FACTOR 16
2376 #else
2377 #define BUFFER_SIZE_FACTOR 1
2378 #endif
2379
2380 read_input_waiting ()
2381 {
2382   struct input_event e;
2383   int nread, i;
2384   extern int quit_char;
2385
2386   if (read_socket_hook)
2387     {
2388       struct input_event buf[256];
2389
2390       read_alarm_should_throw = 0;
2391       if (! setjmp (read_alarm_throw))
2392         nread = (*read_socket_hook) (0, buf, 256, 1, 0);
2393       else
2394         nread = -1;
2395
2396       /* Scan the chars for C-g and store them in kbd_buffer.  */
2397       for (i = 0; i < nread; i++)
2398         {
2399           kbd_buffer_store_event (&buf[i]);
2400           /* Don't look at input that follows a C-g too closely.
2401              This reduces lossage due to autorepeat on C-g.  */
2402           if (buf[i].kind == ascii_keystroke
2403               && XINT(buf[i].code) == quit_char)
2404             break;
2405         }
2406     }
2407   else
2408     {
2409       char buf[3];
2410       nread = read (fileno (stdin), buf, 1);
2411
2412       /* Scan the chars for C-g and store them in kbd_buffer.  */
2413       e.kind = ascii_keystroke;
2414       XSETFRAME (e.frame_or_window, selected_frame);
2415       e.modifiers = 0;
2416       for (i = 0; i < nread; i++)
2417         {
2418           /* Convert chars > 0177 to meta events if desired.
2419              We do this under the same conditions that read_avail_input does.  */
2420           if (read_socket_hook == 0)
2421             {
2422               /* If the user says she has a meta key, then believe her. */
2423               if (meta_key == 1 && (buf[i] & 0x80))
2424                 e.modifiers = meta_modifier;
2425               if (meta_key != 2)
2426                 buf[i] &= ~0x80;
2427             }
2428
2429           XSETINT (e.code, buf[i]);
2430           kbd_buffer_store_event (&e);
2431           /* Don't look at input that follows a C-g too closely.
2432              This reduces lossage due to autorepeat on C-g.  */
2433           if (buf[i] == quit_char)
2434             break;
2435         }
2436     }
2437 }
2438
2439 #endif /* not HAVE_SELECT */
2440 #endif /* not VMS */
2441 \f
2442 #ifdef BSD4_1
2443 /*
2444  * Partially emulate 4.2 open call.
2445  * open is defined as this in 4.1.
2446  *
2447  * - added by Michael Bloom @ Citicorp/TTI
2448  *
2449  */
2450
2451 int
2452 sys_open (path, oflag, mode)
2453      char *path;
2454      int oflag, mode;
2455 {
2456   if (oflag & O_CREAT)
2457     return creat (path, mode);
2458   else
2459     return open (path, oflag);
2460 }
2461
2462 init_sigio (fd)
2463      int fd;
2464 {
2465   if (noninteractive)
2466     return;
2467   lmode = LINTRUP | lmode;
2468   ioctl (fd, TIOCLSET, &lmode);
2469 }
2470
2471 reset_sigio ()
2472 {
2473   if (noninteractive)
2474     return;
2475   lmode = ~LINTRUP & lmode;
2476   ioctl (0, TIOCLSET, &lmode);
2477 }
2478
2479 request_sigio ()
2480 {
2481   sigrelse (SIGTINT);
2482
2483   interrupts_deferred = 0;
2484 }
2485
2486 unrequest_sigio ()
2487 {
2488   sighold (SIGTINT);
2489
2490   interrupts_deferred = 1;
2491 }
2492
2493 /* still inside #ifdef BSD4_1 */
2494 #ifdef subprocesses
2495
2496 int sigheld; /* Mask of held signals */
2497
2498 sigholdx (signum)
2499      int signum;
2500 {
2501   sigheld |= sigbit (signum);
2502   sighold (signum);
2503 }
2504
2505 sigisheld (signum)
2506      int signum;
2507 {
2508   sigheld |= sigbit (signum);
2509 }
2510
2511 sigunhold (signum)
2512      int signum;
2513 {
2514   sigheld &= ~sigbit (signum);
2515   sigrelse (signum);
2516 }
2517
2518 sigfree ()    /* Free all held signals */
2519 {
2520   int i;
2521   for (i = 0; i < NSIG; i++)
2522     if (sigheld & sigbit (i))
2523       sigrelse (i);
2524   sigheld = 0;
2525 }
2526
2527 sigbit (i)
2528 {
2529   return 1 << (i - 1);
2530 }
2531 #endif /* subprocesses */
2532 #endif /* BSD4_1 */
2533 \f
2534 /* POSIX signals support - DJB */
2535 /* Anyone with POSIX signals should have ANSI C declarations */
2536
2537 #ifdef POSIX_SIGNALS
2538
2539 sigset_t old_mask, empty_mask, full_mask, temp_mask;
2540 static struct sigaction new_action, old_action;
2541
2542 init_signals ()
2543 {
2544   sigemptyset (&empty_mask);
2545   sigfillset (&full_mask);
2546 }
2547
2548 signal_handler_t
2549 sys_signal (int signal_number, signal_handler_t action)
2550 {
2551 #ifdef DGUX
2552   /* This gets us restartable system calls for efficiency.
2553      The "else" code will works as well. */
2554   return (berk_signal (signal_number, action));
2555 #else
2556   sigemptyset (&new_action.sa_mask);
2557   new_action.sa_handler = action;
2558 #ifdef SA_RESTART
2559   /* Emacs mostly works better with restartable system services. If this
2560    * flag exists, we probably want to turn it on here.
2561    */
2562   new_action.sa_flags = SA_RESTART;
2563 #else
2564   new_action.sa_flags = 0;
2565 #endif
2566   sigaction (signal_number, &new_action, &old_action);
2567   return (old_action.sa_handler);
2568 #endif /* DGUX */
2569 }
2570
2571 #ifndef __GNUC__
2572 /* If we're compiling with GCC, we don't need this function, since it
2573    can be written as a macro.  */
2574 sigset_t
2575 sys_sigmask (int sig)
2576 {
2577   sigset_t mask;
2578   sigemptyset (&mask);
2579   sigaddset (&mask, sig);
2580   return mask;
2581 }
2582 #endif
2583
2584 int
2585 sys_sigpause (sigset_t new_mask)
2586 {
2587   /* pause emulating berk sigpause... */
2588   sigsuspend (&new_mask);
2589   return (EINTR);
2590 }
2591
2592 /* I'd like to have these guys return pointers to the mask storage in here,
2593    but there'd be trouble if the code was saving multiple masks.  I'll be
2594    safe and pass the structure.  It normally won't be more than 2 bytes
2595    anyhow. - DJB */
2596
2597 sigset_t
2598 sys_sigblock (sigset_t new_mask)
2599 {
2600   sigset_t old_mask;
2601   sigprocmask (SIG_BLOCK, &new_mask, &old_mask);
2602   return (old_mask);
2603 }
2604
2605 sigset_t
2606 sys_sigunblock (sigset_t new_mask)
2607 {
2608   sigset_t old_mask;
2609   sigprocmask (SIG_UNBLOCK, &new_mask, &old_mask);
2610   return (old_mask);
2611 }
2612
2613 sigset_t
2614 sys_sigsetmask (sigset_t new_mask)
2615 {
2616   sigset_t old_mask;
2617   sigprocmask (SIG_SETMASK, &new_mask, &old_mask);
2618   return (old_mask);
2619 }
2620
2621 #endif /* POSIX_SIGNALS */
2622 \f
2623 #ifndef BSTRING
2624
2625 #ifndef bzero
2626
2627 void
2628 bzero (b, length)
2629      register char *b;
2630      register int length;
2631 {
2632 #ifdef VMS
2633   short zero = 0;
2634   long max_str = 65535;
2635
2636   while (length > max_str) {
2637     (void) LIB$MOVC5 (&zero, &zero, &zero, &max_str, b);
2638     length -= max_str;
2639     b += max_str;
2640   }
2641   max_str = length;
2642   (void) LIB$MOVC5 (&zero, &zero, &zero, &max_str, b);
2643 #else
2644   while (length-- > 0)
2645     *b++ = 0;
2646 #endif /* not VMS */
2647 }
2648
2649 #endif /* no bzero */
2650
2651 #ifndef bcopy
2652 /* Saying `void' requires a declaration, above, where bcopy is used
2653    and that declaration causes pain for systems where bcopy is a macro.  */
2654 bcopy (b1, b2, length)
2655      register char *b1;
2656      register char *b2;
2657      register int length;
2658 {
2659 #ifdef VMS
2660   long max_str = 65535;
2661
2662   while (length > max_str) {
2663     (void) LIB$MOVC3 (&max_str, b1, b2);
2664     length -= max_str;
2665     b1 += max_str;
2666     b2 += max_str;
2667   }
2668   max_str = length;
2669   (void) LIB$MOVC3 (&length, b1, b2);
2670 #else
2671   while (length-- > 0)
2672     *b2++ = *b1++;
2673 #endif /* not VMS */
2674 }
2675 #endif /* no bcopy */
2676
2677 #ifndef bcmp
2678 int
2679 bcmp (b1, b2, length)   /* This could be a macro! */
2680      register char *b1;
2681      register char *b2;
2682      register int length;
2683 {
2684 #ifdef VMS
2685   struct dsc$descriptor_s src1 = {length, DSC$K_DTYPE_T, DSC$K_CLASS_S, b1};
2686   struct dsc$descriptor_s src2 = {length, DSC$K_DTYPE_T, DSC$K_CLASS_S, b2};
2687
2688   return STR$COMPARE (&src1, &src2);
2689 #else
2690   while (length-- > 0)
2691     if (*b1++ != *b2++)
2692       return 1;
2693
2694   return 0;
2695 #endif /* not VMS */
2696 }
2697 #endif /* no bcmp */
2698
2699 #endif /* not BSTRING */
2700 \f
2701 #ifndef HAVE_RANDOM
2702 #ifdef random
2703 #define HAVE_RANDOM
2704 #endif
2705 #endif
2706
2707 /* Figure out how many bits the system's random number generator uses.
2708    `random' and `lrand48' are assumed to return 31 usable bits.
2709    BSD `rand' returns a 31 bit value but the low order bits are unusable;
2710    so we'll shift it and treat it like the 15-bit USG `rand'.  */
2711
2712 #ifndef RAND_BITS
2713 # ifdef HAVE_RANDOM
2714 #  define RAND_BITS 31
2715 # else /* !HAVE_RANDOM */
2716 #  ifdef HAVE_LRAND48
2717 #   define RAND_BITS 31
2718 #   define random lrand48
2719 #  else /* !HAVE_LRAND48 */
2720 #   define RAND_BITS 15
2721 #   if RAND_MAX == 32767
2722 #    define random rand
2723 #   else /* RAND_MAX != 32767 */
2724 #    if RAND_MAX == 2147483647
2725 #     define random() (rand () >> 16)
2726 #    else /* RAND_MAX != 2147483647 */
2727 #     ifdef USG
2728 #      define random rand
2729 #     else
2730 #      define random() (rand () >> 16)
2731 #     endif /* !BSD */
2732 #    endif /* RAND_MAX != 2147483647 */
2733 #   endif /* RAND_MAX != 32767 */
2734 #  endif /* !HAVE_LRAND48 */
2735 # endif /* !HAVE_RANDOM */
2736 #endif /* !RAND_BITS */
2737
2738 void
2739 seed_random (arg)
2740      long arg;
2741 {
2742 #ifdef HAVE_RANDOM
2743   srandom ((unsigned int)arg);
2744 #else
2745 # ifdef HAVE_LRAND48
2746   srand48 (arg);
2747 # else
2748   srand ((unsigned int)arg);
2749 # endif
2750 #endif
2751 }
2752
2753 /*
2754  * Build a full Emacs-sized word out of whatever we've got.
2755  * This suffices even for a 64-bit architecture with a 15-bit rand.
2756  */
2757 long
2758 get_random ()
2759 {
2760   long val = random ();
2761 #if VALBITS > RAND_BITS
2762   val = (val << RAND_BITS) ^ random ();
2763 #if VALBITS > 2*RAND_BITS
2764   val = (val << RAND_BITS) ^ random ();
2765 #if VALBITS > 3*RAND_BITS
2766   val = (val << RAND_BITS) ^ random ();
2767 #if VALBITS > 4*RAND_BITS
2768   val = (val << RAND_BITS) ^ random ();
2769 #endif /* need at least 5 */
2770 #endif /* need at least 4 */
2771 #endif /* need at least 3 */
2772 #endif /* need at least 2 */
2773   return val & ((1L << VALBITS) - 1);
2774 }
2775 \f
2776 #ifdef WRONG_NAME_INSQUE
2777
2778 insque (q,p)
2779      caddr_t q,p;
2780 {
2781   _insque (q,p);
2782 }
2783
2784 #endif
2785 \f
2786 #ifdef VMS
2787
2788 #ifdef getenv
2789 /* If any place else asks for the TERM variable,
2790    allow it to be overridden with the EMACS_TERM variable
2791    before attempting to translate the logical name TERM.  As a last
2792    resort, ask for VAX C's special idea of the TERM variable.  */
2793 #undef getenv
2794 char *
2795 sys_getenv (name)
2796      char *name;
2797 {
2798   register char *val;
2799   static char buf[256];
2800   static struct dsc$descriptor_s equiv
2801     = {sizeof (buf), DSC$K_DTYPE_T, DSC$K_CLASS_S, buf};
2802   static struct dsc$descriptor_s d_name
2803     = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0};
2804   short eqlen;
2805
2806   if (!strcmp (name, "TERM"))
2807     {
2808       val = (char *) getenv ("EMACS_TERM");
2809       if (val)
2810         return val;
2811     }
2812
2813   d_name.dsc$w_length = strlen (name);
2814   d_name.dsc$a_pointer = name;
2815   if (LIB$SYS_TRNLOG (&d_name, &eqlen, &equiv) == 1)
2816     {
2817       char *str = (char *) xmalloc (eqlen + 1);
2818       bcopy (buf, str, eqlen);
2819       str[eqlen] = '\0';
2820       /* This is a storage leak, but a pain to fix.  With luck,
2821          no one will ever notice.  */
2822       return str;
2823     }
2824   return (char *) getenv (name);
2825 }
2826 #endif /* getenv */
2827
2828 #ifdef abort
2829 /* Since VMS doesn't believe in core dumps, the only way to debug this beast is
2830    to force a call on the debugger from within the image. */
2831 #undef abort
2832 sys_abort ()
2833 {
2834   reset_sys_modes ();
2835   LIB$SIGNAL (SS$_DEBUG);
2836 }
2837 #endif /* abort */
2838 #endif /* VMS */
2839 \f
2840 #ifdef VMS
2841 #ifdef LINK_CRTL_SHARE
2842 #ifdef SHAREABLE_LIB_BUG
2843 /* Variables declared noshare and initialized in sharable libraries
2844    cannot be shared.  The VMS linker incorrectly forces you to use a private
2845    version which is uninitialized... If not for this "feature", we
2846    could use the C library definition of sys_nerr and sys_errlist. */
2847 int sys_nerr = 35;
2848 char *sys_errlist[] =
2849   {
2850     "error 0",
2851     "not owner",
2852     "no such file or directory",
2853     "no such process",
2854     "interrupted system call",
2855     "i/o error",
2856     "no such device or address",
2857     "argument list too long",
2858     "exec format error",
2859     "bad file number",
2860     "no child process",
2861     "no more processes",
2862     "not enough memory",
2863     "permission denied",
2864     "bad address",
2865     "block device required",
2866     "mount devices busy",
2867     "file exists",
2868     "cross-device link",
2869     "no such device",
2870     "not a directory",
2871     "is a directory",
2872     "invalid argument",
2873     "file table overflow",
2874     "too many open files",
2875     "not a typewriter",
2876     "text file busy",
2877     "file too big",
2878     "no space left on device",
2879     "illegal seek",
2880     "read-only file system",
2881     "too many links",
2882     "broken pipe",
2883     "math argument",
2884     "result too large",
2885     "I/O stream empty",
2886     "vax/vms specific error code nontranslatable error"
2887   };
2888 #endif /* SHAREABLE_LIB_BUG */
2889 #endif /* LINK_CRTL_SHARE */
2890 #endif /* VMS */
2891
2892 #ifndef HAVE_STRERROR
2893 #ifndef WINDOWSNT
2894 char *
2895 strerror (errnum)
2896      int errnum;
2897 {
2898   extern char *sys_errlist[];
2899   extern int sys_nerr;
2900
2901   if (errnum >= 0 && errnum < sys_nerr)
2902     return sys_errlist[errnum];
2903   return (char *) "Unknown error";
2904 }
2905 #endif /* not WINDOWSNT */
2906 #endif /* ! HAVE_STRERROR */
2907 \f
2908 #ifdef INTERRUPTIBLE_OPEN
2909
2910 int
2911 /* VARARGS 2 */
2912 sys_open (path, oflag, mode)
2913      char *path;
2914      int oflag, mode;
2915 {
2916   register int rtnval;
2917
2918   while ((rtnval = open (path, oflag, mode)) == -1
2919          && (errno == EINTR));
2920   return (rtnval);
2921 }
2922
2923 #endif /* INTERRUPTIBLE_OPEN */
2924
2925 #ifdef INTERRUPTIBLE_CLOSE
2926
2927 sys_close (fd)
2928      int fd;
2929 {
2930   register int rtnval;
2931
2932   while ((rtnval = close (fd)) == -1
2933          && (errno == EINTR));
2934   return rtnval;
2935 }
2936
2937 #endif /* INTERRUPTIBLE_CLOSE */
2938
2939 #ifdef INTERRUPTIBLE_IO
2940
2941 int
2942 sys_read (fildes, buf, nbyte)
2943      int fildes;
2944      char *buf;
2945      unsigned int nbyte;
2946 {
2947   register int rtnval;
2948
2949   while ((rtnval = read (fildes, buf, nbyte)) == -1
2950          && (errno == EINTR));
2951   return (rtnval);
2952 }
2953
2954 int
2955 sys_write (fildes, buf, nbyte)
2956      int fildes;
2957      char *buf;
2958      unsigned int nbyte;
2959 {
2960   register int rtnval, bytes_written;
2961
2962   bytes_written = 0;
2963
2964   while (nbyte > 0)
2965     {
2966       rtnval = write (fildes, buf, nbyte);
2967
2968       if (rtnval == -1)
2969         {
2970           if (errno == EINTR)
2971             continue;
2972           else
2973             return (bytes_written ? bytes_written : -1);
2974         }
2975
2976       buf += rtnval;
2977       nbyte -= rtnval;
2978       bytes_written += rtnval;
2979     }
2980   return (bytes_written);
2981 }
2982
2983 #endif /* INTERRUPTIBLE_IO */
2984 \f
2985 #ifndef HAVE_VFORK
2986 #ifndef WINDOWSNT
2987 /*
2988  *      Substitute fork for vfork on USG flavors.
2989  */
2990
2991 vfork ()
2992 {
2993   return (fork ());
2994 }
2995 #endif /* not WINDOWSNT */
2996 #endif /* not HAVE_VFORK */
2997 \f
2998 #ifdef USG
2999 /*
3000  *      All of the following are for USG.
3001  *
3002  *      On USG systems the system calls are INTERRUPTIBLE by signals
3003  *      that the user program has elected to catch.  Thus the system call
3004  *      must be retried in these cases.  To handle this without massive
3005  *      changes in the source code, we remap the standard system call names
3006  *      to names for our own functions in sysdep.c that do the system call
3007  *      with retries.  Actually, for portability reasons, it is good
3008  *      programming practice, as this example shows, to limit all actual
3009  *      system calls to a single occurrence in the source.  Sure, this
3010  *      adds an extra level of function call overhead but it is almost
3011  *      always negligible.   Fred Fish, Unisoft Systems Inc.
3012  */
3013
3014 #ifndef HAVE_SYS_SIGLIST
3015 char *sys_siglist[NSIG + 1] =
3016 {
3017 #ifdef AIX
3018 /* AIX has changed the signals a bit */
3019   "bogus signal",                       /* 0 */
3020   "hangup",                             /* 1  SIGHUP */
3021   "interrupt",                          /* 2  SIGINT */
3022   "quit",                               /* 3  SIGQUIT */
3023   "illegal instruction",                /* 4  SIGILL */
3024   "trace trap",                         /* 5  SIGTRAP */
3025   "IOT instruction",                    /* 6  SIGIOT */
3026   "crash likely",                       /* 7  SIGDANGER */
3027   "floating point exception",           /* 8  SIGFPE */
3028   "kill",                               /* 9  SIGKILL */
3029   "bus error",                          /* 10 SIGBUS */
3030   "segmentation violation",             /* 11 SIGSEGV */
3031   "bad argument to system call",        /* 12 SIGSYS */
3032   "write on a pipe with no one to read it", /* 13 SIGPIPE */
3033   "alarm clock",                        /* 14 SIGALRM */
3034   "software termination signum",        /* 15 SIGTERM */
3035   "user defined signal 1",              /* 16 SIGUSR1 */
3036   "user defined signal 2",              /* 17 SIGUSR2 */
3037   "death of a child",                   /* 18 SIGCLD */
3038   "power-fail restart",                 /* 19 SIGPWR */
3039   "bogus signal",                       /* 20 */
3040   "bogus signal",                       /* 21 */
3041   "bogus signal",                       /* 22 */
3042   "bogus signal",                       /* 23 */
3043   "bogus signal",                       /* 24 */
3044   "LAN I/O interrupt",                  /* 25 SIGAIO */
3045   "PTY I/O interrupt",                  /* 26 SIGPTY */
3046   "I/O intervention required",          /* 27 SIGIOINT */
3047 #ifdef AIXHFT
3048   "HFT grant",                          /* 28 SIGGRANT */
3049   "HFT retract",                        /* 29 SIGRETRACT */
3050   "HFT sound done",                     /* 30 SIGSOUND */
3051   "HFT input ready",                    /* 31 SIGMSG */
3052 #endif
3053 #else /* not AIX */
3054   "bogus signal",                       /* 0 */
3055   "hangup",                             /* 1  SIGHUP */
3056   "interrupt",                          /* 2  SIGINT */
3057   "quit",                               /* 3  SIGQUIT */
3058   "illegal instruction",                /* 4  SIGILL */
3059   "trace trap",                         /* 5  SIGTRAP */
3060   "IOT instruction",                    /* 6  SIGIOT */
3061   "EMT instruction",                    /* 7  SIGEMT */
3062   "floating point exception",           /* 8  SIGFPE */
3063   "kill",                               /* 9  SIGKILL */
3064   "bus error",                          /* 10 SIGBUS */
3065   "segmentation violation",             /* 11 SIGSEGV */
3066   "bad argument to system call",        /* 12 SIGSYS */
3067   "write on a pipe with no one to read it", /* 13 SIGPIPE */
3068   "alarm clock",                        /* 14 SIGALRM */
3069   "software termination signum",        /* 15 SIGTERM */
3070   "user defined signal 1",              /* 16 SIGUSR1 */
3071   "user defined signal 2",              /* 17 SIGUSR2 */
3072   "death of a child",                   /* 18 SIGCLD */
3073   "power-fail restart",                 /* 19 SIGPWR */
3074 #ifdef sun
3075   "window size change",                     /* 20 SIGWINCH */
3076   "urgent socket condition",                /* 21 SIGURG */
3077   "pollable event occured",                 /* 22 SIGPOLL */
3078   "stop (cannot be caught or ignored)", /*  23 SIGSTOP */
3079   "user stop requested from tty",           /* 24 SIGTSTP */
3080   "stopped process has been continued", /* 25 SIGCONT */
3081   "background tty read attempted",          /* 26 SIGTTIN */
3082   "background tty write attempted",    /* 27 SIGTTOU */
3083   "virtual timer expired",                  /* 28 SIGVTALRM */
3084   "profiling timer expired",                /* 29 SIGPROF */
3085   "exceeded cpu limit",                     /* 30 SIGXCPU */
3086   "exceeded file size limit",               /* 31 SIGXFSZ */
3087   "process's lwps are blocked",     /*  32 SIGWAITING */
3088   "special signal used by thread library", /* 33 SIGLWP */
3089 #ifdef SIGFREEZE
3090   "Special Signal Used By CPR",     /* 34 SIGFREEZE */
3091 #endif
3092 #ifdef SIGTHAW
3093   "Special Signal Used By CPR",     /* 35 SIGTHAW */
3094 #endif
3095 #endif /* sun */
3096 #endif /* not AIX */
3097   0
3098   };
3099 #endif /* HAVE_SYS_SIGLIST */
3100
3101 /*
3102  *      Warning, this function may not duplicate 4.2 action properly
3103  *      under error conditions.
3104  */
3105
3106 #ifndef MAXPATHLEN
3107 /* In 4.1, param.h fails to define this.  */
3108 #define MAXPATHLEN 1024
3109 #endif
3110
3111 #ifndef HAVE_GETWD
3112
3113 char *
3114 getwd (pathname)
3115      char *pathname;
3116 {
3117   char *npath, *spath;
3118   extern char *getcwd ();
3119
3120   BLOCK_INPUT;                  /* getcwd uses malloc */
3121   spath = npath = getcwd ((char *) 0, MAXPATHLEN);
3122   if (spath == 0)
3123     return spath;
3124   /* On Altos 3068, getcwd can return @hostname/dir, so discard
3125      up to first slash.  Should be harmless on other systems.  */
3126   while (*npath && *npath != '/')
3127     npath++;
3128   strcpy (pathname, npath);
3129   free (spath);                 /* getcwd uses malloc */
3130   UNBLOCK_INPUT;
3131   return pathname;
3132 }
3133
3134 #endif /* HAVE_GETWD */
3135
3136 /*
3137  *      Emulate rename using unlink/link.  Note that this is
3138  *      only partially correct.  Also, doesn't enforce restriction
3139  *      that files be of same type (regular->regular, dir->dir, etc).
3140  */
3141
3142 #ifndef HAVE_RENAME
3143
3144 rename (from, to)
3145      const char *from;
3146      const char *to;
3147 {
3148   if (access (from, 0) == 0)
3149     {
3150       unlink (to);
3151       if (link (from, to) == 0)
3152         if (unlink (from) == 0)
3153           return (0);
3154     }
3155   return (-1);
3156 }
3157
3158 #endif
3159
3160
3161 #ifdef HPUX
3162 #ifndef HAVE_PERROR
3163
3164 /* HPUX curses library references perror, but as far as we know
3165    it won't be called.  Anyway this definition will do for now.  */
3166
3167 perror ()
3168 {
3169 }
3170
3171 #endif /* not HAVE_PERROR */
3172 #endif /* HPUX */
3173
3174 #ifndef HAVE_DUP2
3175
3176 /*
3177  *      Emulate BSD dup2.  First close newd if it already exists.
3178  *      Then, attempt to dup oldd.  If not successful, call dup2 recursively
3179  *      until we are, then close the unsuccessful ones.
3180  */
3181
3182 dup2 (oldd, newd)
3183      int oldd;
3184      int newd;
3185 {
3186   register int fd, ret;
3187
3188   sys_close (newd);
3189
3190 #ifdef F_DUPFD
3191   fd = fcntl (oldd, F_DUPFD, newd);
3192   if (fd != newd)
3193     error ("can't dup2 (%i,%i) : %s", oldd, newd, strerror (errno));
3194 #else
3195   fd = dup (old);
3196   if (fd == -1)
3197     return -1;
3198   if (fd == new)
3199     return new;
3200   ret = dup2 (old,new);
3201   sys_close (fd);
3202   return ret;
3203 #endif
3204 }
3205
3206 #endif /* not HAVE_DUP2 */
3207
3208 /*
3209  *      Gettimeofday.  Simulate as much as possible.  Only accurate
3210  *      to nearest second.  Emacs doesn't use tzp so ignore it for now.
3211  *      Only needed when subprocesses are defined.
3212  */
3213
3214 #ifdef subprocesses
3215 #ifndef VMS
3216 #ifndef HAVE_GETTIMEOFDAY
3217 #ifdef HAVE_TIMEVAL
3218
3219 /* ARGSUSED */
3220 gettimeofday (tp, tzp)
3221      struct timeval *tp;
3222      struct timezone *tzp;
3223 {
3224   extern long time ();
3225
3226   tp->tv_sec = time ((long *)0);
3227   tp->tv_usec = 0;
3228   if (tzp != 0)
3229     tzp->tz_minuteswest = -1;
3230 }
3231
3232 #endif
3233 #endif
3234 #endif
3235 #endif /* subprocess && !HAVE_GETTIMEOFDAY && HAVE_TIMEVAL && !VMS */
3236
3237 /*
3238  *      This function will go away as soon as all the stubs fixed. (fnf)
3239  */
3240
3241 croak (badfunc)
3242      char *badfunc;
3243 {
3244   printf ("%s not yet implemented\r\n", badfunc);
3245   reset_sys_modes ();
3246   exit (1);
3247 }
3248
3249 #endif /* USG */
3250 \f
3251 #ifdef DGUX
3252
3253 char *sys_siglist[NSIG + 1] =
3254 {
3255   "null signal",                         /*  0 SIGNULL   */
3256   "hangup",                              /*  1 SIGHUP    */
3257   "interrupt",                           /*  2 SIGINT    */
3258   "quit",                                /*  3 SIGQUIT   */
3259   "illegal instruction",                 /*  4 SIGILL    */
3260   "trace trap",                          /*  5 SIGTRAP   */
3261   "abort termination",                   /*  6 SIGABRT   */
3262   "SIGEMT",                              /*  7 SIGEMT    */
3263   "floating point exception",            /*  8 SIGFPE    */
3264   "kill",                                /*  9 SIGKILL   */
3265   "bus error",                           /* 10 SIGBUS    */
3266   "segmentation violation",              /* 11 SIGSEGV   */
3267   "bad argument to system call",         /* 12 SIGSYS    */
3268   "write on a pipe with no reader",      /* 13 SIGPIPE   */
3269   "alarm clock",                         /* 14 SIGALRM   */
3270   "software termination signal",         /* 15 SIGTERM   */
3271   "user defined signal 1",               /* 16 SIGUSR1   */
3272   "user defined signal 2",               /* 17 SIGUSR2   */
3273   "child stopped or terminated",         /* 18 SIGCLD    */
3274   "power-fail restart",                  /* 19 SIGPWR    */
3275   "window size changed",                 /* 20 SIGWINCH  */
3276   "undefined",                           /* 21           */
3277   "pollable event occurred",             /* 22 SIGPOLL   */
3278   "sendable stop signal not from tty",   /* 23 SIGSTOP   */
3279   "stop signal from tty",                /* 24 SIGSTP    */
3280   "continue a stopped process",          /* 25 SIGCONT   */
3281   "attempted background tty read",       /* 26 SIGTTIN   */
3282   "attempted background tty write",      /* 27 SIGTTOU   */
3283   "undefined",                           /* 28           */
3284   "undefined",                           /* 29           */
3285   "undefined",                           /* 30           */
3286   "undefined",                           /* 31           */
3287   "undefined",                           /* 32           */
3288   "socket (TCP/IP) urgent data arrival", /* 33 SIGURG    */
3289   "I/O is possible",                     /* 34 SIGIO     */
3290   "exceeded cpu time limit",             /* 35 SIGXCPU   */
3291   "exceeded file size limit",            /* 36 SIGXFSZ   */
3292   "virtual time alarm",                  /* 37 SIGVTALRM */
3293   "profiling time alarm",                /* 38 SIGPROF   */
3294   "undefined",                           /* 39           */
3295   "file record locks revoked",           /* 40 SIGLOST   */
3296   "undefined",                           /* 41           */
3297   "undefined",                           /* 42           */
3298   "undefined",                           /* 43           */
3299   "undefined",                           /* 44           */
3300   "undefined",                           /* 45           */
3301   "undefined",                           /* 46           */
3302   "undefined",                           /* 47           */
3303   "undefined",                           /* 48           */
3304   "undefined",                           /* 49           */
3305   "undefined",                           /* 50           */
3306   "undefined",                           /* 51           */
3307   "undefined",                           /* 52           */
3308   "undefined",                           /* 53           */
3309   "undefined",                           /* 54           */
3310   "undefined",                           /* 55           */
3311   "undefined",                           /* 56           */
3312   "undefined",                           /* 57           */
3313   "undefined",                           /* 58           */
3314   "undefined",                           /* 59           */
3315   "undefined",                           /* 60           */
3316   "undefined",                           /* 61           */
3317   "undefined",                           /* 62           */
3318   "undefined",                           /* 63           */
3319   "notification message in mess. queue", /* 64 SIGDGNOTIFY */
3320   0
3321 };
3322
3323 #endif /* DGUX */
3324 \f
3325 /* Directory routines for systems that don't have them. */
3326
3327 #ifdef SYSV_SYSTEM_DIR
3328
3329 #include <dirent.h>
3330
3331 #if defined(BROKEN_CLOSEDIR) || !defined(HAVE_CLOSEDIR)
3332
3333 int
3334 closedir (dirp)
3335      register DIR *dirp;              /* stream from opendir */
3336 {
3337   int rtnval;
3338
3339   rtnval = sys_close (dirp->dd_fd);
3340
3341   /* Some systems (like Solaris) allocate the buffer and the DIR all
3342      in one block.  Why in the world are we freeing this ourselves
3343      anyway?  */
3344 #if ! (defined (sun) && defined (USG5_4))
3345   xfree ((char *) dirp->dd_buf); /* directory block defined in <dirent.h> */
3346 #endif
3347   xfree ((char *) dirp);
3348
3349   return rtnval;
3350 }
3351 #endif /* BROKEN_CLOSEDIR or not HAVE_CLOSEDIR */
3352 #endif /* SYSV_SYSTEM_DIR */
3353
3354 #ifdef NONSYSTEM_DIR_LIBRARY
3355
3356 DIR *
3357 opendir (filename)
3358      char *filename;    /* name of directory */
3359 {
3360   register DIR *dirp;           /* -> malloc'ed storage */
3361   register int fd;              /* file descriptor for read */
3362   struct stat sbuf;             /* result of fstat */
3363
3364   fd = sys_open (filename, 0);
3365   if (fd < 0)
3366     return 0;
3367
3368   BLOCK_INPUT;
3369   if (fstat (fd, &sbuf) < 0
3370       || (sbuf.st_mode & S_IFMT) != S_IFDIR
3371       || (dirp = (DIR *) malloc (sizeof (DIR))) == 0)
3372     {
3373       sys_close (fd);
3374       UNBLOCK_INPUT;
3375       return 0;         /* bad luck today */
3376     }
3377   UNBLOCK_INPUT;
3378
3379   dirp->dd_fd = fd;
3380   dirp->dd_loc = dirp->dd_size = 0;     /* refill needed */
3381
3382   return dirp;
3383 }
3384
3385 void
3386 closedir (dirp)
3387      register DIR *dirp;                /* stream from opendir */
3388 {
3389   sys_close (dirp->dd_fd);
3390   xfree ((char *) dirp);
3391 }
3392
3393
3394 #ifndef VMS
3395 #define DIRSIZ  14
3396 struct olddir
3397   {
3398     ino_t od_ino;               /* inode */
3399     char od_name[DIRSIZ];       /* filename */
3400   };
3401 #endif /* not VMS */
3402
3403 struct direct dir_static;       /* simulated directory contents */
3404
3405 /* ARGUSED */
3406 struct direct *
3407 readdir (dirp)
3408      register DIR *dirp;        /* stream from opendir */
3409 {
3410 #ifndef VMS
3411   register struct olddir *dp;   /* -> directory data */
3412 #else /* VMS */
3413   register struct dir$_name *dp; /* -> directory data */
3414   register struct dir$_version *dv; /* -> version data */
3415 #endif /* VMS */
3416
3417   for (; ;)
3418     {
3419       if (dirp->dd_loc >= dirp->dd_size)
3420         dirp->dd_loc = dirp->dd_size = 0;
3421
3422       if (dirp->dd_size == 0    /* refill buffer */
3423           && (dirp->dd_size = sys_read (dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ)) <= 0)
3424         return 0;
3425
3426 #ifndef VMS
3427       dp = (struct olddir *) &dirp->dd_buf[dirp->dd_loc];
3428       dirp->dd_loc += sizeof (struct olddir);
3429
3430       if (dp->od_ino != 0)      /* not deleted entry */
3431         {
3432           dir_static.d_ino = dp->od_ino;
3433           strncpy (dir_static.d_name, dp->od_name, DIRSIZ);
3434           dir_static.d_name[DIRSIZ] = '\0';
3435           dir_static.d_namlen = strlen (dir_static.d_name);
3436           dir_static.d_reclen = sizeof (struct direct)
3437             - MAXNAMLEN + 3
3438               + dir_static.d_namlen - dir_static.d_namlen % 4;
3439           return &dir_static;   /* -> simulated structure */
3440         }
3441 #else /* VMS */
3442       dp = (struct dir$_name *) dirp->dd_buf;
3443       if (dirp->dd_loc == 0)
3444         dirp->dd_loc = (dp->dir$b_namecount&1) ? dp->dir$b_namecount + 1
3445           : dp->dir$b_namecount;
3446       dv = (struct dir$_version *)&dp->dir$t_name[dirp->dd_loc];
3447       dir_static.d_ino = dv->dir$w_fid_num;
3448       dir_static.d_namlen = dp->dir$b_namecount;
3449       dir_static.d_reclen = sizeof (struct direct)
3450         - MAXNAMLEN + 3
3451           + dir_static.d_namlen - dir_static.d_namlen % 4;
3452       strncpy (dir_static.d_name, dp->dir$t_name, dp->dir$b_namecount);
3453       dir_static.d_name[dir_static.d_namlen] = '\0';
3454       dirp->dd_loc = dirp->dd_size; /* only one record at a time */
3455       return &dir_static;
3456 #endif /* VMS */
3457     }
3458 }
3459
3460 #ifdef VMS
3461 /* readdirver is just like readdir except it returns all versions of a file
3462    as separate entries.  */
3463
3464 /* ARGUSED */
3465 struct direct *
3466 readdirver (dirp)
3467      register DIR *dirp;        /* stream from opendir */
3468 {
3469   register struct dir$_name *dp; /* -> directory data */
3470   register struct dir$_version *dv; /* -> version data */
3471
3472   if (dirp->dd_loc >= dirp->dd_size - sizeof (struct dir$_name))
3473     dirp->dd_loc = dirp->dd_size = 0;
3474
3475   if (dirp->dd_size == 0        /* refill buffer */
3476       && (dirp->dd_size = sys_read (dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ)) <= 0)
3477     return 0;
3478
3479   dp = (struct dir$_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$t_name[dirp->dd_loc];
3484   strncpy (dir_static.d_name, dp->dir$t_name, dp->dir$b_namecount);
3485   sprintf (&dir_static.d_name[dp->dir$b_namecount], ";%d", dv->dir$w_version);
3486   dir_static.d_namlen = strlen (dir_static.d_name);
3487   dir_static.d_ino = dv->dir$w_fid_num;
3488   dir_static.d_reclen = sizeof (struct direct) - MAXNAMLEN + 3
3489                         + dir_static.d_namlen - dir_static.d_namlen % 4;
3490   dirp->dd_loc = ((char *) (++dv) - dp->dir$t_name);
3491   return &dir_static;
3492 }
3493
3494 #endif /* VMS */
3495
3496 #endif /* NONSYSTEM_DIR_LIBRARY */
3497
3498 \f
3499 int
3500 set_file_times (filename, atime, mtime)
3501      char *filename;
3502      EMACS_TIME atime, mtime;
3503 {
3504 #ifdef HAVE_UTIMES
3505   struct timeval tv[2];
3506   tv[0] = atime;
3507   tv[1] = mtime;
3508   return utimes (filename, tv);
3509 #else /* not HAVE_UTIMES */
3510   struct utimbuf utb;
3511   utb.actime = EMACS_SECS (atime);
3512   utb.modtime = EMACS_SECS (mtime);
3513   return utime (filename, &utb);
3514 #endif /* not HAVE_UTIMES */
3515 }
3516 \f
3517 /* mkdir and rmdir functions, for systems which don't have them.  */
3518
3519 #ifndef HAVE_MKDIR
3520 /*
3521  * Written by Robert Rother, Mariah Corporation, August 1985.
3522  *
3523  * If you want it, it's yours.  All I ask in return is that if you
3524  * figure out how to do this in a Bourne Shell script you send me
3525  * a copy.
3526  *                                      sdcsvax!rmr or rmr@uscd
3527  *
3528  * Severely hacked over by John Gilmore to make a 4.2BSD compatible
3529  * subroutine.  11Mar86; hoptoad!gnu
3530  *
3531  * Modified by rmtodd@uokmax 6-28-87 -- when making an already existing dir,
3532  * subroutine didn't return EEXIST.  It does now.
3533  */
3534
3535 /*
3536  * Make a directory.
3537  */
3538 #ifdef MKDIR_PROTOTYPE
3539 MKDIR_PROTOTYPE
3540 #else
3541 int
3542 mkdir (dpath, dmode)
3543      char *dpath;
3544      int dmode;
3545 #endif
3546 {
3547   int cpid, status, fd;
3548   struct stat statbuf;
3549
3550   if (stat (dpath, &statbuf) == 0)
3551     {
3552       errno = EEXIST;           /* Stat worked, so it already exists */
3553       return -1;
3554     }
3555
3556   /* If stat fails for a reason other than non-existence, return error */
3557   if (errno != ENOENT)
3558     return -1;
3559
3560   synch_process_alive = 1;
3561   switch (cpid = fork ())
3562     {
3563
3564     case -1:                    /* Error in fork */
3565       return (-1);              /* Errno is set already */
3566
3567     case 0:                     /* Child process */
3568       /*
3569                  * Cheap hack to set mode of new directory.  Since this
3570                  * child process is going away anyway, we zap its umask.
3571                  * FIXME, this won't suffice to set SUID, SGID, etc. on this
3572                  * directory.  Does anybody care?
3573                  */
3574       status = umask (0);       /* Get current umask */
3575       status = umask (status | (0777 & ~dmode));        /* Set for mkdir */
3576       fd = sys_open("/dev/null", 2);
3577       if (fd >= 0)
3578         {
3579           dup2 (fd, 0);
3580           dup2 (fd, 1);
3581           dup2 (fd, 2);
3582         }
3583       execl ("/bin/mkdir", "mkdir", dpath, (char *) 0);
3584       _exit (-1);               /* Can't exec /bin/mkdir */
3585
3586     default:                    /* Parent process */
3587       wait_for_termination (cpid);
3588     }
3589
3590   if (synch_process_death != 0 || synch_process_retcode != 0)
3591     {
3592       errno = EIO;              /* We don't know why, but */
3593       return -1;                /* /bin/mkdir failed */
3594     }
3595
3596   return 0;
3597 }
3598 #endif /* not HAVE_MKDIR */
3599
3600 #ifndef HAVE_RMDIR
3601 int
3602 rmdir (dpath)
3603      char *dpath;
3604 {
3605   int cpid, status, fd;
3606   struct stat statbuf;
3607
3608   if (stat (dpath, &statbuf) != 0)
3609     {
3610       /* Stat just set errno.  We don't have to */
3611       return -1;
3612     }
3613
3614   synch_process_alive = 1;
3615   switch (cpid = fork ())
3616     {
3617
3618     case -1:                    /* Error in fork */
3619       return (-1);              /* Errno is set already */
3620
3621     case 0:                     /* Child process */
3622       fd = sys_open("/dev/null", 2);
3623       if (fd >= 0)
3624         {
3625           dup2 (fd, 0);
3626           dup2 (fd, 1);
3627           dup2 (fd, 2);
3628         }
3629       wait_for_termination (cpid);
3630   if (synch_process_death != 0 || synch_process_retcode != 0)
3631       return -1;                /* /bin/rmdir failed */
3632     default:                    /* Parent process */
3633       while (cpid != wait (&status));   /* Wait for kid to finish */
3634     }
3635
3636   if (WIFSIGNALED (status) || WEXITSTATUS (status) != 0)
3637     {
3638       errno = EIO;              /* We don't know why, but */
3639       return -1;                /* /bin/mkdir failed */
3640     }
3641
3642   return 0;
3643 }
3644 #endif /* !HAVE_RMDIR */
3645
3646
3647 \f
3648 /* Functions for VMS */
3649 #ifdef VMS
3650 #include "vms-pwd.h"
3651 #include <acldef.h>
3652 #include <chpdef.h>
3653 #include <jpidef.h>
3654
3655 /* Return as a string the VMS error string pertaining to STATUS.
3656    Reuses the same static buffer each time it is called.  */
3657
3658 char *
3659 vmserrstr (status)
3660      int status;                /* VMS status code */
3661 {
3662   int bufadr[2];
3663   short len;
3664   static char buf[257];
3665
3666   bufadr[0] = sizeof buf - 1;
3667   bufadr[1] = (int) buf;
3668   if (! (SYS$GETMSG (status, &len, bufadr, 0x1, 0) & 1))
3669     return "untranslatable VMS error status";
3670   buf[len] = '\0';
3671   return buf;
3672 }
3673
3674 #ifdef access
3675 #undef access
3676
3677 /* The following is necessary because 'access' emulation by VMS C (2.0) does
3678  * not work correctly.  (It also doesn't work well in version 2.3.)
3679  */
3680
3681 #ifdef VMS4_4
3682
3683 #define DESCRIPTOR(name,string) struct dsc$descriptor_s name = \
3684         { strlen (string), DSC$K_DTYPE_T, DSC$K_CLASS_S, string }
3685
3686 typedef union {
3687     struct {
3688         unsigned short s_buflen;
3689         unsigned short s_code;
3690         char *s_bufadr;
3691         unsigned short *s_retlenadr;
3692     } s;
3693     int end;
3694 } item;
3695 #define buflen s.s_buflen
3696 #define code s.s_code
3697 #define bufadr s.s_bufadr
3698 #define retlenadr s.s_retlenadr
3699
3700 #define R_OK 4  /* test for read permission */
3701 #define W_OK 2  /* test for write permission */
3702 #define X_OK 1  /* test for execute (search) permission */
3703 #define F_OK 0  /* test for presence of file */
3704
3705 int
3706 sys_access (path, mode)
3707      char *path;
3708      int mode;
3709 {
3710   static char *user = NULL;
3711   char dir_fn[512];
3712
3713   /* translate possible directory spec into .DIR file name, so brain-dead
3714    * access can treat the directory like a file.  */
3715   if (directory_file_name (path, dir_fn))
3716     path = dir_fn;
3717
3718   if (mode == F_OK)
3719     return access (path, mode);
3720   if (user == NULL && (user = (char *) getenv ("USER")) == NULL)
3721     return -1;
3722   {
3723     int stat;
3724     int flags;
3725     int acces;
3726     unsigned short int dummy;
3727     item itemlst[3];
3728     static int constant = ACL$C_FILE;
3729     DESCRIPTOR (path_desc, path);
3730     DESCRIPTOR (user_desc, user);
3731
3732     flags = 0;
3733     acces = 0;
3734     if ((mode & X_OK) && ((stat = access (path, mode)) < 0 || mode == X_OK))
3735       return stat;
3736     if (mode & R_OK)
3737       acces |= CHP$M_READ;
3738     if (mode & W_OK)
3739       acces |= CHP$M_WRITE;
3740     itemlst[0].buflen = sizeof (int);
3741     itemlst[0].code = CHP$_FLAGS;
3742     itemlst[0].bufadr = (char *) &flags;
3743     itemlst[0].retlenadr = &dummy;
3744     itemlst[1].buflen = sizeof (int);
3745     itemlst[1].code = CHP$_ACCESS;
3746     itemlst[1].bufadr = (char *) &acces;
3747     itemlst[1].retlenadr = &dummy;
3748     itemlst[2].end = CHP$_END;
3749     stat = SYS$CHECK_ACCESS (&constant, &path_desc, &user_desc, itemlst);
3750     return stat == SS$_NORMAL ? 0 : -1;
3751   }
3752 }
3753
3754 #else /* not VMS4_4 */
3755
3756 #include <prvdef.h>
3757 #define ACE$M_WRITE     2
3758 #define ACE$C_KEYID     1
3759
3760 static unsigned short memid, grpid;
3761 static unsigned int uic;
3762
3763 /* Called from init_sys_modes, so it happens not very often
3764    but at least each time Emacs is loaded.  */
3765 sys_access_reinit ()
3766 {
3767   uic = 0;
3768 }
3769
3770 int
3771 sys_access (filename, type)
3772      char * filename;
3773      int type;
3774 {
3775   struct FAB fab;
3776   struct XABPRO xab;
3777   int status, size, i, typecode, acl_controlled;
3778   unsigned int *aclptr, *aclend, aclbuf[60];
3779   union prvdef prvmask;
3780
3781   /* Get UIC and GRP values for protection checking.  */
3782   if (uic == 0)
3783     {
3784       status = LIB$GETJPI (&JPI$_UIC, 0, 0, &uic, 0, 0);
3785       if (! (status & 1))
3786         return -1;
3787       memid = uic & 0xFFFF;
3788       grpid = uic >> 16;
3789     }
3790
3791   if (type != 2)                /* not checking write access */
3792     return access (filename, type);
3793
3794   /* Check write protection. */
3795
3796 #define CHECKPRIV(bit)    (prvmask.bit)
3797 #define WRITEABLE(field)  (! ((xab.xab$w_pro >> field) & XAB$M_NOWRITE))
3798
3799   /* Find privilege bits */
3800   status = SYS$SETPRV (0, 0, 0, prvmask);
3801   if (! (status & 1))
3802     error ("Unable to find privileges: %s", vmserrstr (status));
3803   if (CHECKPRIV (PRV$V_BYPASS))
3804     return 0;                   /* BYPASS enabled */
3805   fab = cc$rms_fab;
3806   fab.fab$b_fac = FAB$M_GET;
3807   fab.fab$l_fna = filename;
3808   fab.fab$b_fns = strlen (filename);
3809   fab.fab$l_xab = &xab;
3810   xab = cc$rms_xabpro;
3811   xab.xab$l_aclbuf = aclbuf;
3812   xab.xab$w_aclsiz = sizeof (aclbuf);
3813   status = SYS$OPEN (&fab, 0, 0);
3814   if (! (status & 1))
3815     return -1;
3816   SYS$CLOSE (&fab, 0, 0);
3817   /* Check system access */
3818   if (CHECKPRIV (PRV$V_SYSPRV) && WRITEABLE (XAB$V_SYS))
3819     return 0;
3820   /* Check ACL entries, if any */
3821   acl_controlled = 0;
3822   if (xab.xab$w_acllen > 0)
3823     {
3824       aclptr = aclbuf;
3825       aclend = &aclbuf[xab.xab$w_acllen / 4];
3826       while (*aclptr && aclptr < aclend)
3827         {
3828           size = (*aclptr & 0xff) / 4;
3829           typecode = (*aclptr >> 8) & 0xff;
3830           if (typecode == ACE$C_KEYID)
3831             for (i = size - 1; i > 1; i--)
3832               if (aclptr[i] == uic)
3833                 {
3834                   acl_controlled = 1;
3835                   if (aclptr[1] & ACE$M_WRITE)
3836                     return 0;   /* Write access through ACL */
3837                 }
3838           aclptr = &aclptr[size];
3839         }
3840       if (acl_controlled)       /* ACL specified, prohibits write access */
3841         return -1;
3842     }
3843   /* No ACL entries specified, check normal protection */
3844   if (WRITEABLE (XAB$V_WLD))    /* World writeable */
3845     return 0;
3846   if (WRITEABLE (XAB$V_GRP) &&
3847       (unsigned short) (xab.xab$l_uic >> 16) == grpid)
3848     return 0;                   /* Group writeable */
3849   if (WRITEABLE (XAB$V_OWN) &&
3850       (xab.xab$l_uic & 0xFFFF) == memid)
3851     return 0;                   /* Owner writeable */
3852
3853   return -1;    /* Not writeable */
3854 }
3855 #endif /* not VMS4_4 */
3856 #endif /* access */
3857
3858 static char vtbuf[NAM$C_MAXRSS+1];
3859
3860 /* translate a vms file spec to a unix path */
3861 char *
3862 sys_translate_vms (vfile)
3863      char * vfile;
3864 {
3865   char * p;
3866   char * targ;
3867
3868   if (!vfile)
3869     return 0;
3870
3871   targ = vtbuf;
3872
3873   /* leading device or logical name is a root directory */
3874   if (p = strchr (vfile, ':'))
3875     {
3876       *targ++ = '/';
3877       while (vfile < p)
3878         *targ++ = *vfile++;
3879       vfile++;
3880       *targ++ = '/';
3881     }
3882   p = vfile;
3883   if (*p == '[' || *p == '<')
3884     {
3885       while (*++vfile != *p + 2)
3886         switch (*vfile)
3887           {
3888           case '.':
3889             if (vfile[-1] == *p)
3890               *targ++ = '.';
3891             *targ++ = '/';
3892             break;
3893
3894           case '-':
3895             *targ++ = '.';
3896             *targ++ = '.';
3897             break;
3898
3899           default:
3900             *targ++ = *vfile;
3901             break;
3902           }
3903       vfile++;
3904       *targ++ = '/';
3905     }
3906   while (*vfile)
3907     *targ++ = *vfile++;
3908
3909   return vtbuf;
3910 }
3911
3912 static char utbuf[NAM$C_MAXRSS+1];
3913
3914 /* translate a unix path to a VMS file spec */
3915 char *
3916 sys_translate_unix (ufile)
3917      char * ufile;
3918 {
3919   int slash_seen = 0;
3920   char *p;
3921   char * targ;
3922
3923   if (!ufile)
3924     return 0;
3925
3926   targ = utbuf;
3927
3928   if (*ufile == '/')
3929     {
3930       ufile++;
3931     }
3932
3933   while (*ufile)
3934     {
3935       switch (*ufile)
3936         {
3937         case '/':
3938           if (slash_seen)
3939             if (index (&ufile[1], '/'))
3940               *targ++ = '.';
3941             else
3942               *targ++ = ']';
3943           else
3944             {
3945               *targ++ = ':';
3946               if (index (&ufile[1], '/'))
3947                 *targ++ = '[';
3948               slash_seen = 1;
3949             }
3950           break;
3951
3952         case '.':
3953           if (strncmp (ufile, "./", 2) == 0)
3954             {
3955               if (!slash_seen)
3956                 {
3957                   *targ++ = '[';
3958                   slash_seen = 1;
3959                 }
3960               ufile++;          /* skip the dot */
3961               if (index (&ufile[1], '/'))
3962                 *targ++ = '.';
3963               else
3964                 *targ++ = ']';
3965             }
3966           else if (strncmp (ufile, "../", 3) == 0)
3967             {
3968               if (!slash_seen)
3969                 {
3970                   *targ++ = '[';
3971                   slash_seen = 1;
3972                 }
3973               *targ++ = '-';
3974               ufile += 2;       /* skip the dots */
3975               if (index (&ufile[1], '/'))
3976                 *targ++ = '.';
3977               else
3978                 *targ++ = ']';
3979             }
3980           else
3981             *targ++ = *ufile;
3982           break;
3983
3984         default:
3985           *targ++ = *ufile;
3986           break;
3987         }
3988       ufile++;
3989     }
3990   *targ = '\0';
3991
3992   return utbuf;
3993 }
3994
3995 char *
3996 getwd (pathname)
3997      char *pathname;
3998 {
3999   char *ptr, *val;
4000   extern char *getcwd ();
4001
4002 #define MAXPATHLEN 1024
4003
4004   ptr = xmalloc (MAXPATHLEN);
4005   val = getcwd (ptr, MAXPATHLEN);
4006   if (val == 0)
4007     {
4008       xfree (ptr);
4009       return val;
4010     }
4011   strcpy (pathname, ptr);
4012   xfree (ptr);
4013
4014  return pathname;
4015 }
4016
4017 getppid ()
4018 {
4019   long item_code = JPI$_OWNER;
4020   unsigned long parent_id;
4021   int status;
4022
4023   if (((status = LIB$GETJPI (&item_code, 0, 0, &parent_id)) & 1) == 0)
4024     {
4025       errno = EVMSERR;
4026       vaxc$errno = status;
4027       return -1;
4028     }
4029   return parent_id;
4030 }
4031
4032 #undef getuid
4033 unsigned
4034 sys_getuid ()
4035 {
4036   return (getgid () << 16) | getuid ();
4037 }
4038
4039 int
4040 sys_read (fildes, buf, nbyte)
4041      int fildes;
4042      char *buf;
4043      unsigned int nbyte;
4044 {
4045   return read (fildes, buf, (nbyte < MAXIOSIZE ? nbyte : MAXIOSIZE));
4046 }
4047
4048 #if 0
4049 int
4050 sys_write (fildes, buf, nbyte)
4051      int fildes;
4052      char *buf;
4053      unsigned int nbyte;
4054 {
4055   register int nwrote, rtnval = 0;
4056
4057   while (nbyte > MAXIOSIZE && (nwrote = write (fildes, buf, MAXIOSIZE)) > 0) {
4058     nbyte -= nwrote;
4059     buf += nwrote;
4060     rtnval += nwrote;
4061   }
4062   if (nwrote < 0)
4063     return rtnval ? rtnval : -1;
4064   if ((nwrote = write (fildes, buf, nbyte)) < 0)
4065     return rtnval ? rtnval : -1;
4066   return (rtnval + nwrote);
4067 }
4068 #endif /* 0 */
4069
4070 /*
4071  *      VAX/VMS VAX C RTL really loses. It insists that records
4072  *      end with a newline (carriage return) character, and if they
4073  *      don't it adds one (nice of it isn't it!)
4074  *
4075  *      Thus we do this stupidity below.
4076  */
4077
4078 int
4079 sys_write (fildes, buf, nbytes)
4080      int fildes;
4081      char *buf;
4082      unsigned int nbytes;
4083 {
4084   register char *p;
4085   register char *e;
4086   int sum = 0;
4087   struct stat st;
4088
4089   fstat (fildes, &st);
4090   p = buf;
4091   while (nbytes > 0)
4092     {
4093       int len, retval;
4094
4095       /* Handle fixed-length files with carriage control.  */
4096       if (st.st_fab_rfm == FAB$C_FIX
4097           && ((st.st_fab_rat & (FAB$M_FTN | FAB$M_CR)) != 0))
4098         {
4099           len = st.st_fab_mrs;
4100           retval = write (fildes, p, min (len, nbytes));
4101           if (retval != len)
4102             return -1;
4103           retval++;     /* This skips the implied carriage control */
4104         }
4105       else
4106         {
4107           e =  p + min (MAXIOSIZE, nbytes) - 1;
4108           while (*e != '\n' && e > p) e--;
4109           if (p == e)           /* Ok.. so here we add a newline... sigh. */
4110             e = p + min (MAXIOSIZE, nbytes) - 1;
4111           len = e + 1 - p;
4112           retval = write (fildes, p, len);
4113           if (retval != len)
4114             return -1;
4115         }
4116       p += retval;
4117       sum += retval;
4118       nbytes -= retval;
4119     }
4120   return sum;
4121 }
4122
4123 /* Create file NEW copying its attributes from file OLD.  If
4124    OLD is 0 or does not exist, create based on the value of
4125    vms_stmlf_recfm. */
4126
4127 /* Protection value the file should ultimately have.
4128    Set by create_copy_attrs, and use by rename_sansversions.  */
4129 static unsigned short int fab_final_pro;
4130
4131 int
4132 creat_copy_attrs (old, new)
4133      char *old, *new;
4134 {
4135   struct FAB fab = cc$rms_fab;
4136   struct XABPRO xabpro;
4137   char aclbuf[256];     /* Choice of size is arbitrary.  See below. */
4138   extern int vms_stmlf_recfm;
4139
4140   if (old)
4141     {
4142       fab.fab$b_fac = FAB$M_GET;
4143       fab.fab$l_fna = old;
4144       fab.fab$b_fns = strlen (old);
4145       fab.fab$l_xab = (char *) &xabpro;
4146       xabpro = cc$rms_xabpro;
4147       xabpro.xab$l_aclbuf = aclbuf;
4148       xabpro.xab$w_aclsiz = sizeof aclbuf;
4149       /* Call $OPEN to fill in the fab & xabpro fields. */
4150       if (SYS$OPEN (&fab, 0, 0) & 1)
4151         {
4152           SYS$CLOSE (&fab, 0, 0);
4153           fab.fab$l_alq = 0;    /* zero the allocation quantity */
4154           if (xabpro.xab$w_acllen > 0)
4155             {
4156               if (xabpro.xab$w_acllen > sizeof aclbuf)
4157                 /* If the acl buffer was too short, redo open with longer one.
4158                    Wouldn't need to do this if there were some system imposed
4159                    limit on the size of an ACL, but I can't find any such. */
4160                 {
4161                   xabpro.xab$l_aclbuf = (char *) alloca (xabpro.xab$w_acllen);
4162                   xabpro.xab$w_aclsiz = xabpro.xab$w_acllen;
4163                   if (SYS$OPEN (&fab, 0, 0) & 1)
4164                     SYS$CLOSE (&fab, 0, 0);
4165                   else
4166                     old = 0;
4167                 }
4168             }
4169           else
4170             xabpro.xab$l_aclbuf = 0;
4171         }
4172       else
4173         old = 0;
4174     }
4175   fab.fab$l_fna = new;
4176   fab.fab$b_fns = strlen (new);
4177   if (!old)
4178     {
4179       fab.fab$l_xab = 0;
4180       fab.fab$b_rfm = vms_stmlf_recfm ? FAB$C_STMLF : FAB$C_VAR;
4181       fab.fab$b_rat = FAB$M_CR;
4182     }
4183
4184   /* Set the file protections such that we will be able to manipulate
4185      this file.  Once we are done writing and renaming it, we will set
4186      the protections back.  */
4187   if (old)
4188     fab_final_pro = xabpro.xab$w_pro;
4189   else
4190     SYS$SETDFPROT (0, &fab_final_pro);
4191   xabpro.xab$w_pro &= 0xff0f; /* set O:rewd for now. This is set back later. */
4192
4193   /* Create the new file with either default attrs or attrs copied
4194      from old file. */
4195   if (!(SYS$CREATE (&fab, 0, 0) & 1))
4196     return -1;
4197   SYS$CLOSE (&fab, 0, 0);
4198   /* As this is a "replacement" for creat, return a file descriptor
4199      opened for writing. */
4200   return open (new, O_WRONLY);
4201 }
4202
4203 #ifdef creat
4204 #undef creat
4205 #include <varargs.h>
4206 #ifdef __GNUC__
4207 #ifndef va_count
4208 #define va_count(X) ((X) = *(((int *) &(va_alist)) - 1))
4209 #endif
4210 #endif
4211
4212 sys_creat (va_alist)
4213      va_dcl
4214 {
4215   va_list list_incrementer;
4216   char *name;
4217   int mode;
4218   int rfd;                      /* related file descriptor */
4219   int fd;                       /* Our new file descriptor */
4220   int count;
4221   struct stat st_buf;
4222   char rfm[12];
4223   char rat[15];
4224   char mrs[13];
4225   char fsz[13];
4226   extern int vms_stmlf_recfm;
4227
4228   va_count (count);
4229   va_start (list_incrementer);
4230   name = va_arg (list_incrementer, char *);
4231   mode = va_arg (list_incrementer, int);
4232   if (count > 2)
4233     rfd = va_arg (list_incrementer, int);
4234   va_end (list_incrementer);
4235   if (count > 2)
4236     {
4237       /* Use information from the related file descriptor to set record
4238          format of the newly created file. */
4239       fstat (rfd, &st_buf);
4240       switch (st_buf.st_fab_rfm)
4241         {
4242         case FAB$C_FIX:
4243           strcpy (rfm, "rfm = fix");
4244           sprintf (mrs, "mrs = %d", st_buf.st_fab_mrs);
4245           strcpy (rat, "rat = ");
4246           if (st_buf.st_fab_rat & FAB$M_CR)
4247             strcat (rat, "cr");
4248           else if (st_buf.st_fab_rat & FAB$M_FTN)
4249             strcat (rat, "ftn");
4250           else if (st_buf.st_fab_rat & FAB$M_PRN)
4251             strcat (rat, "prn");
4252           if (st_buf.st_fab_rat & FAB$M_BLK)
4253             if (st_buf.st_fab_rat & (FAB$M_CR|FAB$M_FTN|FAB$M_PRN))
4254               strcat (rat, ", blk");
4255             else
4256               strcat (rat, "blk");
4257           return creat (name, 0, rfm, rat, mrs);
4258
4259         case FAB$C_VFC:
4260           strcpy (rfm, "rfm = vfc");
4261           sprintf (fsz, "fsz = %d", st_buf.st_fab_fsz);
4262           strcpy (rat, "rat = ");
4263           if (st_buf.st_fab_rat & FAB$M_CR)
4264             strcat (rat, "cr");
4265           else if (st_buf.st_fab_rat & FAB$M_FTN)
4266             strcat (rat, "ftn");
4267           else if (st_buf.st_fab_rat & FAB$M_PRN)
4268             strcat (rat, "prn");
4269           if (st_buf.st_fab_rat & FAB$M_BLK)
4270             if (st_buf.st_fab_rat & (FAB$M_CR|FAB$M_FTN|FAB$M_PRN))
4271               strcat (rat, ", blk");
4272             else
4273               strcat (rat, "blk");
4274           return creat (name, 0, rfm, rat, fsz);
4275
4276         case FAB$C_STM:
4277           strcpy (rfm, "rfm = stm");
4278           break;
4279
4280         case FAB$C_STMCR:
4281           strcpy (rfm, "rfm = stmcr");
4282           break;
4283
4284         case FAB$C_STMLF:
4285           strcpy (rfm, "rfm = stmlf");
4286           break;
4287
4288         case FAB$C_UDF:
4289           strcpy (rfm, "rfm = udf");
4290           break;
4291
4292         case FAB$C_VAR:
4293           strcpy (rfm, "rfm = var");
4294           break;
4295         }
4296       strcpy (rat, "rat = ");
4297       if (st_buf.st_fab_rat & FAB$M_CR)
4298         strcat (rat, "cr");
4299       else if (st_buf.st_fab_rat & FAB$M_FTN)
4300         strcat (rat, "ftn");
4301       else if (st_buf.st_fab_rat & FAB$M_PRN)
4302         strcat (rat, "prn");
4303       if (st_buf.st_fab_rat & FAB$M_BLK)
4304         if (st_buf.st_fab_rat & (FAB$M_CR|FAB$M_FTN|FAB$M_PRN))
4305           strcat (rat, ", blk");
4306         else
4307           strcat (rat, "blk");
4308     }
4309   else
4310     {
4311       strcpy (rfm, vms_stmlf_recfm ? "rfm = stmlf" : "rfm=var");
4312       strcpy (rat, "rat=cr");
4313     }
4314   /* Until the VAX C RTL fixes the many bugs with modes, always use
4315      mode 0 to get the user's default protection. */
4316   fd = creat (name, 0, rfm, rat);
4317   if (fd < 0 && errno == EEXIST)
4318     {
4319       if (unlink (name) < 0)
4320         report_file_error ("delete", build_string (name));
4321       fd = creat (name, 0, rfm, rat);
4322     }
4323   return fd;
4324 }
4325 #endif /* creat */
4326
4327 /* fwrite to stdout is S L O W.  Speed it up by using fputc...*/
4328 sys_fwrite (ptr, size, num, fp)
4329      register char * ptr;
4330      FILE * fp;
4331 {
4332   register int tot = num * size;
4333
4334   while (tot--)
4335     fputc (*ptr++, fp);
4336 }
4337
4338 /*
4339  * The VMS C library routine creat actually creates a new version of an
4340  * existing file rather than truncating the old version.  There are times
4341  * when this is not the desired behavior, for instance, when writing an
4342  * auto save file (you only want one version), or when you don't have
4343  * write permission in the directory containing the file (but the file
4344  * itself is writable).  Hence this routine, which is equivalent to
4345  * "close (creat (fn, 0));" on Unix if fn already exists.
4346  */
4347 int
4348 vms_truncate (fn)
4349      char *fn;
4350 {
4351   struct FAB xfab = cc$rms_fab;
4352   struct RAB xrab = cc$rms_rab;
4353   int status;
4354
4355   xfab.fab$l_fop = FAB$M_TEF;   /* free allocated but unused blocks on close */
4356   xfab.fab$b_fac = FAB$M_TRN | FAB$M_GET; /* allow truncate and get access */
4357   xfab.fab$b_shr = FAB$M_NIL;   /* allow no sharing - file must be locked */
4358   xfab.fab$l_fna = fn;
4359   xfab.fab$b_fns = strlen (fn);
4360   xfab.fab$l_dna = ";0";        /* default to latest version of the file */
4361   xfab.fab$b_dns = 2;
4362   xrab.rab$l_fab = &xfab;
4363
4364   /* This gibberish opens the file, positions to the first record, and
4365      deletes all records from there until the end of file. */
4366   if ((SYS$OPEN (&xfab) & 01) == 01)
4367     {
4368       if ((SYS$CONNECT (&xrab) & 01) == 01 &&
4369           (SYS$FIND (&xrab) & 01) == 01 &&
4370           (SYS$TRUNCATE (&xrab) & 01) == 01)
4371         status = 0;
4372       else
4373         status = -1;
4374     }
4375   else
4376     status = -1;
4377   SYS$CLOSE (&xfab);
4378   return status;
4379 }
4380
4381 /* Define this symbol to actually read SYSUAF.DAT.  This requires either
4382    SYSPRV or a readable SYSUAF.DAT. */
4383
4384 #ifdef READ_SYSUAF
4385 /*
4386  * getuaf.c
4387  *
4388  * Routine to read the VMS User Authorization File and return
4389  * a specific user's record.
4390  */
4391
4392 static struct UAF retuaf;
4393
4394 struct UAF *
4395 get_uaf_name (uname)
4396      char * uname;
4397 {
4398   register status;
4399   struct FAB uaf_fab;
4400   struct RAB uaf_rab;
4401
4402   uaf_fab = cc$rms_fab;
4403   uaf_rab = cc$rms_rab;
4404   /* initialize fab fields */
4405   uaf_fab.fab$l_fna = "SYS$SYSTEM:SYSUAF.DAT";
4406   uaf_fab.fab$b_fns = 21;
4407   uaf_fab.fab$b_fac = FAB$M_GET;
4408   uaf_fab.fab$b_org = FAB$C_IDX;
4409   uaf_fab.fab$b_shr = FAB$M_GET|FAB$M_PUT|FAB$M_UPD|FAB$M_DEL;
4410   /* initialize rab fields */
4411   uaf_rab.rab$l_fab = &uaf_fab;
4412   /* open the User Authorization File */
4413   status = SYS$OPEN (&uaf_fab);
4414   if (!(status&1))
4415     {
4416       errno = EVMSERR;
4417       vaxc$errno = status;
4418       return 0;
4419     }
4420   status = SYS$CONNECT (&uaf_rab);
4421   if (!(status&1))
4422     {
4423       errno = EVMSERR;
4424       vaxc$errno = status;
4425       return 0;
4426     }
4427   /* read the requested record - index is in uname */
4428   uaf_rab.rab$l_kbf = uname;
4429   uaf_rab.rab$b_ksz = strlen (uname);
4430   uaf_rab.rab$b_rac = RAB$C_KEY;
4431   uaf_rab.rab$l_ubf = (char *)&retuaf;
4432   uaf_rab.rab$w_usz = sizeof retuaf;
4433   status = SYS$GET (&uaf_rab);
4434   if (!(status&1))
4435     {
4436       errno = EVMSERR;
4437       vaxc$errno = status;
4438       return 0;
4439     }
4440   /* close the User Authorization File */
4441   status = SYS$DISCONNECT (&uaf_rab);
4442   if (!(status&1))
4443     {
4444       errno = EVMSERR;
4445       vaxc$errno = status;
4446       return 0;
4447     }
4448   status = SYS$CLOSE (&uaf_fab);
4449   if (!(status&1))
4450     {
4451       errno = EVMSERR;
4452       vaxc$errno = status;
4453       return 0;
4454     }
4455   return &retuaf;
4456 }
4457
4458 struct UAF *
4459 get_uaf_uic (uic)
4460      unsigned long uic;
4461 {
4462   register status;
4463   struct FAB uaf_fab;
4464   struct RAB uaf_rab;
4465
4466   uaf_fab = cc$rms_fab;
4467   uaf_rab = cc$rms_rab;
4468   /* initialize fab fields */
4469   uaf_fab.fab$l_fna = "SYS$SYSTEM:SYSUAF.DAT";
4470   uaf_fab.fab$b_fns = 21;
4471   uaf_fab.fab$b_fac = FAB$M_GET;
4472   uaf_fab.fab$b_org = FAB$C_IDX;
4473   uaf_fab.fab$b_shr = FAB$M_GET|FAB$M_PUT|FAB$M_UPD|FAB$M_DEL;
4474   /* initialize rab fields */
4475   uaf_rab.rab$l_fab = &uaf_fab;
4476   /* open the User Authorization File */
4477   status = SYS$OPEN (&uaf_fab);
4478   if (!(status&1))
4479     {
4480       errno = EVMSERR;
4481       vaxc$errno = status;
4482       return 0;
4483     }
4484   status = SYS$CONNECT (&uaf_rab);
4485   if (!(status&1))
4486     {
4487       errno = EVMSERR;
4488       vaxc$errno = status;
4489       return 0;
4490     }
4491   /* read the requested record - index is in uic */
4492   uaf_rab.rab$b_krf = 1;        /* 1st alternate key */
4493   uaf_rab.rab$l_kbf = (char *) &uic;
4494   uaf_rab.rab$b_ksz = sizeof uic;
4495   uaf_rab.rab$b_rac = RAB$C_KEY;
4496   uaf_rab.rab$l_ubf = (char *)&retuaf;
4497   uaf_rab.rab$w_usz = sizeof retuaf;
4498   status = SYS$GET (&uaf_rab);
4499   if (!(status&1))
4500     {
4501       errno = EVMSERR;
4502       vaxc$errno = status;
4503       return 0;
4504     }
4505   /* close the User Authorization File */
4506   status = SYS$DISCONNECT (&uaf_rab);
4507   if (!(status&1))
4508     {
4509       errno = EVMSERR;
4510       vaxc$errno = status;
4511       return 0;
4512     }
4513   status = SYS$CLOSE (&uaf_fab);
4514   if (!(status&1))
4515     {
4516       errno = EVMSERR;
4517       vaxc$errno = status;
4518       return 0;
4519     }
4520   return &retuaf;
4521 }
4522
4523 static struct passwd retpw;
4524
4525 struct passwd *
4526 cnv_uaf_pw (up)
4527      struct UAF * up;
4528 {
4529   char * ptr;
4530
4531   /* copy these out first because if the username is 32 chars, the next
4532      section will overwrite the first byte of the UIC */
4533   retpw.pw_uid = up->uaf$w_mem;
4534   retpw.pw_gid = up->uaf$w_grp;
4535
4536   /* I suppose this is not the best sytle, to possibly overwrite one
4537      byte beyond the end of the field, but what the heck... */
4538   ptr = &up->uaf$t_username[UAF$S_USERNAME];
4539   while (ptr[-1] == ' ')
4540     ptr--;
4541   *ptr = '\0';
4542   strcpy (retpw.pw_name, up->uaf$t_username);
4543
4544   /* the rest of these are counted ascii strings */
4545   strncpy (retpw.pw_gecos, &up->uaf$t_owner[1], up->uaf$t_owner[0]);
4546   retpw.pw_gecos[up->uaf$t_owner[0]] = '\0';
4547   strncpy (retpw.pw_dir, &up->uaf$t_defdev[1], up->uaf$t_defdev[0]);
4548   retpw.pw_dir[up->uaf$t_defdev[0]] = '\0';
4549   strncat (retpw.pw_dir, &up->uaf$t_defdir[1], up->uaf$t_defdir[0]);
4550   retpw.pw_dir[up->uaf$t_defdev[0] + up->uaf$t_defdir[0]] = '\0';
4551   strncpy (retpw.pw_shell, &up->uaf$t_defcli[1], up->uaf$t_defcli[0]);
4552   retpw.pw_shell[up->uaf$t_defcli[0]] = '\0';
4553
4554   return &retpw;
4555 }
4556 #else /* not READ_SYSUAF */
4557 static struct passwd retpw;
4558 #endif /* not READ_SYSUAF */
4559
4560 struct passwd *
4561 getpwnam (name)
4562      char * name;
4563 {
4564 #ifdef READ_SYSUAF
4565   struct UAF *up;
4566 #else
4567   char * user;
4568   char * dir;
4569   unsigned char * full;
4570 #endif /* READ_SYSUAF */
4571   char *ptr = name;
4572
4573   while (*ptr)
4574     {
4575       if ('a' <= *ptr && *ptr <= 'z')
4576         *ptr -= 040;
4577       ptr++;
4578     }
4579 #ifdef READ_SYSUAF
4580   if (!(up = get_uaf_name (name)))
4581     return 0;
4582   return cnv_uaf_pw (up);
4583 #else
4584   if (strcmp (name, getenv ("USER")) == 0)
4585     {
4586       retpw.pw_uid = getuid ();
4587       retpw.pw_gid = getgid ();
4588       strcpy (retpw.pw_name, name);
4589       if (full = egetenv ("FULLNAME"))
4590         strcpy (retpw.pw_gecos, full);
4591       else
4592         *retpw.pw_gecos = '\0';
4593       strcpy (retpw.pw_dir, egetenv ("HOME"));
4594       *retpw.pw_shell = '\0';
4595       return &retpw;
4596     }
4597   else
4598     return 0;
4599 #endif /* not READ_SYSUAF */
4600 }
4601
4602 struct passwd *
4603 getpwuid (uid)
4604      unsigned long uid;
4605 {
4606 #ifdef READ_SYSUAF
4607   struct UAF * up;
4608
4609   if (!(up = get_uaf_uic (uid)))
4610     return 0;
4611   return cnv_uaf_pw (up);
4612 #else
4613   if (uid == sys_getuid ())
4614     return getpwnam (egetenv ("USER"));
4615   else
4616     return 0;
4617 #endif /* not READ_SYSUAF */
4618 }
4619
4620 /* return total address space available to the current process.  This is
4621    the sum of the current p0 size, p1 size and free page table entries
4622    available. */
4623 vlimit ()
4624 {
4625   int item_code;
4626   unsigned long free_pages;
4627   unsigned long frep0va;
4628   unsigned long frep1va;
4629   register status;
4630
4631   item_code = JPI$_FREPTECNT;
4632   if (((status = LIB$GETJPI (&item_code, 0, 0, &free_pages)) & 1) == 0)
4633     {
4634       errno = EVMSERR;
4635       vaxc$errno = status;
4636       return -1;
4637     }
4638   free_pages *= 512;
4639
4640   item_code = JPI$_FREP0VA;
4641   if (((status = LIB$GETJPI (&item_code, 0, 0, &frep0va)) & 1) == 0)
4642     {
4643       errno = EVMSERR;
4644       vaxc$errno = status;
4645       return -1;
4646     }
4647   item_code = JPI$_FREP1VA;
4648   if (((status = LIB$GETJPI (&item_code, 0, 0, &frep1va)) & 1) == 0)
4649     {
4650       errno = EVMSERR;
4651       vaxc$errno = status;
4652       return -1;
4653     }
4654
4655   return free_pages + frep0va + (0x7fffffff - frep1va);
4656 }
4657
4658 define_logical_name (varname, string)
4659      char *varname;
4660      char *string;
4661 {
4662   struct dsc$descriptor_s strdsc =
4663     {strlen (string), DSC$K_DTYPE_T, DSC$K_CLASS_S, string};
4664   struct dsc$descriptor_s envdsc =
4665     {strlen (varname), DSC$K_DTYPE_T, DSC$K_CLASS_S, varname};
4666   struct dsc$descriptor_s lnmdsc =
4667     {7, DSC$K_DTYPE_T, DSC$K_CLASS_S, "LNM$JOB"};
4668
4669   return LIB$SET_LOGICAL (&envdsc, &strdsc, &lnmdsc, 0, 0);
4670 }
4671
4672 delete_logical_name (varname)
4673      char *varname;
4674 {
4675   struct dsc$descriptor_s envdsc =
4676     {strlen (varname), DSC$K_DTYPE_T, DSC$K_CLASS_S, varname};
4677   struct dsc$descriptor_s lnmdsc =
4678     {7, DSC$K_DTYPE_T, DSC$K_CLASS_S, "LNM$JOB"};
4679
4680   return LIB$DELETE_LOGICAL (&envdsc, &lnmdsc);
4681 }
4682
4683 ulimit ()
4684 {}
4685
4686 setpgrp ()
4687 {}
4688
4689 execvp ()
4690 {
4691   error ("execvp system call not implemented");
4692 }
4693
4694 int
4695 rename (from, to)
4696      char *from, *to;
4697 {
4698   int status;
4699   struct FAB from_fab = cc$rms_fab, to_fab = cc$rms_fab;
4700   struct NAM from_nam = cc$rms_nam, to_nam = cc$rms_nam;
4701   char from_esn[NAM$C_MAXRSS];
4702   char to_esn[NAM$C_MAXRSS];
4703
4704   from_fab.fab$l_fna = from;
4705   from_fab.fab$b_fns = strlen (from);
4706   from_fab.fab$l_nam = &from_nam;
4707   from_fab.fab$l_fop = FAB$M_NAM;
4708
4709   from_nam.nam$l_esa = from_esn;
4710   from_nam.nam$b_ess = sizeof from_esn;
4711
4712   to_fab.fab$l_fna = to;
4713   to_fab.fab$b_fns = strlen (to);
4714   to_fab.fab$l_nam = &to_nam;
4715   to_fab.fab$l_fop = FAB$M_NAM;
4716
4717   to_nam.nam$l_esa = to_esn;
4718   to_nam.nam$b_ess = sizeof to_esn;
4719
4720   status = SYS$RENAME (&from_fab, 0, 0, &to_fab);
4721
4722   if (status & 1)
4723     return 0;
4724   else
4725     {
4726       if (status == RMS$_DEV)
4727         errno = EXDEV;
4728       else
4729         errno = EVMSERR;
4730       vaxc$errno = status;
4731       return -1;
4732     }
4733 }
4734
4735 /* This function renames a file like `rename', but it strips
4736    the version number from the "to" filename, such that the "to" file is
4737    will always be a new version.  It also sets the file protection once it is
4738    finished.  The protection that we will use is stored in fab_final_pro,
4739    and was set when we did a creat_copy_attrs to create the file that we
4740    are renaming.
4741
4742    We could use the chmod function, but Eunichs uses 3 bits per user category
4743    to describe the protection, and VMS uses 4 (write and delete are separate
4744    bits).  To maintain portability, the VMS implementation of `chmod' wires
4745    the W and D bits together.  */
4746
4747
4748 static struct fibdef fib;       /* We need this initialized to zero */
4749 char vms_file_written[NAM$C_MAXRSS];
4750
4751 int
4752 rename_sans_version (from,to)
4753      char *from, *to;
4754 {
4755   short int chan;
4756   int stat;
4757   short int iosb[4];
4758   int status;
4759   struct FAB to_fab = cc$rms_fab;
4760   struct NAM to_nam = cc$rms_nam;
4761   struct dsc$descriptor fib_d ={sizeof (fib),0,0,(char*) &fib};
4762   struct dsc$descriptor fib_attr[2]
4763     = {{sizeof (fab_final_pro),ATR$C_FPRO,0,(char*) &fab_final_pro},{0,0,0,0}};
4764   char to_esn[NAM$C_MAXRSS];
4765
4766   $DESCRIPTOR (disk,to_esn);
4767
4768   to_fab.fab$l_fna = to;
4769   to_fab.fab$b_fns = strlen (to);
4770   to_fab.fab$l_nam = &to_nam;
4771   to_fab.fab$l_fop = FAB$M_NAM;
4772
4773   to_nam.nam$l_esa = to_esn;
4774   to_nam.nam$b_ess = sizeof to_esn;
4775
4776   status = SYS$PARSE (&to_fab, 0, 0); /* figure out the full file name */
4777
4778   if (to_nam.nam$l_fnb && NAM$M_EXP_VER)
4779     *(to_nam.nam$l_ver) = '\0';
4780
4781   stat = rename (from, to_esn);
4782   if (stat < 0)
4783     return stat;
4784
4785   strcpy (vms_file_written, to_esn);
4786
4787   to_fab.fab$l_fna = vms_file_written; /* this points to the versionless name */
4788   to_fab.fab$b_fns = strlen (vms_file_written);
4789
4790   /* Now set the file protection to the correct value */
4791   SYS$OPEN (&to_fab, 0, 0);     /* This fills in the nam$w_fid fields */
4792
4793   /* Copy these fields into the fib */
4794   fib.fib$r_fid_overlay.fib$w_fid[0] = to_nam.nam$w_fid[0];
4795   fib.fib$r_fid_overlay.fib$w_fid[1] = to_nam.nam$w_fid[1];
4796   fib.fib$r_fid_overlay.fib$w_fid[2] = to_nam.nam$w_fid[2];
4797
4798   SYS$CLOSE (&to_fab, 0, 0);
4799
4800   stat = SYS$ASSIGN (&disk, &chan, 0, 0); /* open a channel to the disk */
4801   if (!stat)
4802     LIB$SIGNAL (stat);
4803   stat = SYS$QIOW (0, chan, IO$_MODIFY, iosb, 0, 0, &fib_d,
4804                    0, 0, 0, &fib_attr, 0);
4805   if (!stat)
4806     LIB$SIGNAL (stat);
4807   stat = SYS$DASSGN (chan);
4808   if (!stat)
4809     LIB$SIGNAL (stat);
4810   strcpy (vms_file_written, to_esn); /* We will write this to the terminal*/
4811   return 0;
4812 }
4813
4814 link (file, new)
4815      char * file, * new;
4816 {
4817   register status;
4818   struct FAB fab;
4819   struct NAM nam;
4820   unsigned short fid[3];
4821   char esa[NAM$C_MAXRSS];
4822
4823   fab = cc$rms_fab;
4824   fab.fab$l_fop = FAB$M_OFP;
4825   fab.fab$l_fna = file;
4826   fab.fab$b_fns = strlen (file);
4827   fab.fab$l_nam = &nam;
4828
4829   nam = cc$rms_nam;
4830   nam.nam$l_esa = esa;
4831   nam.nam$b_ess = NAM$C_MAXRSS;
4832
4833   status = SYS$PARSE (&fab);
4834   if ((status & 1) == 0)
4835     {
4836       errno = EVMSERR;
4837       vaxc$errno = status;
4838       return -1;
4839     }
4840   status = SYS$SEARCH (&fab);
4841   if ((status & 1) == 0)
4842     {
4843       errno = EVMSERR;
4844       vaxc$errno = status;
4845       return -1;
4846     }
4847
4848   fid[0] = nam.nam$w_fid[0];
4849   fid[1] = nam.nam$w_fid[1];
4850   fid[2] = nam.nam$w_fid[2];
4851
4852   fab.fab$l_fna = new;
4853   fab.fab$b_fns = strlen (new);
4854
4855   status = SYS$PARSE (&fab);
4856   if ((status & 1) == 0)
4857     {
4858       errno = EVMSERR;
4859       vaxc$errno = status;
4860       return -1;
4861     }
4862
4863   nam.nam$w_fid[0] = fid[0];
4864   nam.nam$w_fid[1] = fid[1];
4865   nam.nam$w_fid[2] = fid[2];
4866
4867   nam.nam$l_esa = nam.nam$l_name;
4868   nam.nam$b_esl = nam.nam$b_name + nam.nam$b_type + nam.nam$b_ver;
4869
4870   status = SYS$ENTER (&fab);
4871   if ((status & 1) == 0)
4872     {
4873       errno = EVMSERR;
4874       vaxc$errno = status;
4875       return -1;
4876     }
4877
4878   return 0;
4879 }
4880
4881 croak (badfunc)
4882      char *badfunc;
4883 {
4884   printf ("%s not yet implemented\r\n", badfunc);
4885   reset_sys_modes ();
4886   exit (1);
4887 }
4888
4889 long
4890 random ()
4891 {
4892   /* Arrange to return a range centered on zero.  */
4893   return rand () - (1 << 30);
4894 }
4895
4896 srandom (seed)
4897 {
4898   srand (seed);
4899 }
4900 #endif /* VMS */
4901 \f
4902 #ifdef AIXHFT
4903
4904 /* Called from init_sys_modes.  */
4905 hft_init ()
4906 {
4907   int junk;
4908
4909   /* If we're not on an HFT we shouldn't do any of this.  We determine
4910      if we are on an HFT by trying to get an HFT error code.  If this
4911      call fails, we're not on an HFT. */
4912 #ifdef IBMR2AIX
4913   if (ioctl (0, HFQERROR, &junk) < 0)
4914     return;
4915 #else /* not IBMR2AIX */
4916   if (ioctl (0, HFQEIO, 0) < 0)
4917     return;
4918 #endif /* not IBMR2AIX */
4919
4920   /* On AIX the default hft keyboard mapping uses backspace rather than delete
4921      as the rubout key's ASCII code.  Here this is changed.  The bug is that
4922      there's no way to determine the old mapping, so in reset_sys_modes
4923      we need to assume that the normal map had been present.  Of course, this
4924      code also doesn't help if on a terminal emulator which doesn't understand
4925      HFT VTD's. */
4926   {
4927     struct hfbuf buf;
4928     struct hfkeymap keymap;
4929
4930     buf.hf_bufp = (char *)&keymap;
4931     buf.hf_buflen = sizeof (keymap);
4932     keymap.hf_nkeys = 2;
4933     keymap.hfkey[0].hf_kpos = 15;
4934     keymap.hfkey[0].hf_kstate = HFMAPCHAR | HFSHFNONE;
4935 #ifdef IBMR2AIX
4936     keymap.hfkey[0].hf_keyidh = '<';
4937 #else /* not IBMR2AIX */
4938     keymap.hfkey[0].hf_page = '<';
4939 #endif /* not IBMR2AIX */
4940     keymap.hfkey[0].hf_char = 127;
4941     keymap.hfkey[1].hf_kpos = 15;
4942     keymap.hfkey[1].hf_kstate = HFMAPCHAR | HFSHFSHFT;
4943 #ifdef IBMR2AIX
4944     keymap.hfkey[1].hf_keyidh = '<';
4945 #else /* not IBMR2AIX */
4946     keymap.hfkey[1].hf_page = '<';
4947 #endif /* not IBMR2AIX */
4948     keymap.hfkey[1].hf_char = 127;
4949     hftctl (0, HFSKBD, &buf);
4950   }
4951   /* The HFT system on AIX doesn't optimize for scrolling, so it's really ugly
4952      at times.  */
4953   line_ins_del_ok = char_ins_del_ok = 0;
4954 }
4955
4956 /* Reset the rubout key to backspace. */
4957
4958 hft_reset ()
4959 {
4960   struct hfbuf buf;
4961   struct hfkeymap keymap;
4962   int junk;
4963
4964 #ifdef IBMR2AIX
4965   if (ioctl (0, HFQERROR, &junk) < 0)
4966     return;
4967 #else /* not IBMR2AIX */
4968   if (ioctl (0, HFQEIO, 0) < 0)
4969     return;
4970 #endif /* not IBMR2AIX */
4971
4972   buf.hf_bufp = (char *)&keymap;
4973   buf.hf_buflen = sizeof (keymap);
4974   keymap.hf_nkeys = 2;
4975   keymap.hfkey[0].hf_kpos = 15;
4976   keymap.hfkey[0].hf_kstate = HFMAPCHAR | HFSHFNONE;
4977 #ifdef IBMR2AIX
4978   keymap.hfkey[0].hf_keyidh = '<';
4979 #else /* not IBMR2AIX */
4980   keymap.hfkey[0].hf_page = '<';
4981 #endif /* not IBMR2AIX */
4982   keymap.hfkey[0].hf_char = 8;
4983   keymap.hfkey[1].hf_kpos = 15;
4984   keymap.hfkey[1].hf_kstate = HFMAPCHAR | HFSHFSHFT;
4985 #ifdef IBMR2AIX
4986   keymap.hfkey[1].hf_keyidh = '<';
4987 #else /* not IBMR2AIX */
4988   keymap.hfkey[1].hf_page = '<';
4989 #endif /* not IBMR2AIX */
4990   keymap.hfkey[1].hf_char = 8;
4991   hftctl (0, HFSKBD, &buf);
4992 }
4993
4994 #endif /* AIXHFT */
4995
4996 #ifdef USE_DL_STUBS
4997
4998 /* These are included on Sunos 4.1 when we do not use shared libraries.
4999    X11 libraries may refer to these functions but (we hope) do not
5000    actually call them.  */
5001
5002 void *
5003 dlopen ()
5004 {
5005   return 0;
5006 }
5007
5008 void *
5009 dlsym ()
5010 {
5011   return 0;
5012 }
5013
5014 int
5015 dlclose ()
5016 {
5017   return -1;
5018 }
5019
5020 #endif /* USE_DL_STUBS */