src/sysdep.c

   1 /* Interfaces to system-dependent kernel and library entries.
   2    Copyright (C) 1985-1988, 1993-1995, 1999-2011
   3                  Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include <config.h>
  21 #include <ctype.h>
  22 #include <signal.h>
  23 #include <stdio.h>
  24 #include <setjmp.h>
  25 #ifdef HAVE_PWD_H
  26 #include <pwd.h>
  27 #include <grp.h>
  28 #endif /* HAVE_PWD_H */
  29 #ifdef HAVE_LIMITS_H
  30 #include <limits.h>
  31 #endif /* HAVE_LIMITS_H */
  32 #include <unistd.h>
  33
  34 #include "lisp.h"
  35 #include "sysselect.h"
  36 #include "blockinput.h"
  37
  38 #ifdef WINDOWSNT
  39 #define read sys_read
  40 #define write sys_write
  41 #include <windows.h>
  42 #ifndef NULL
  43 #define NULL 0
  44 #endif
  45 #endif /* not WINDOWSNT */
  46
  47 #include <sys/types.h>
  48 #include <sys/stat.h>
  49 #include <errno.h>
  50
  51 #ifdef HAVE_SETPGID
  52 #if !defined (USG)
  53 #undef setpgrp
  54 #define setpgrp setpgid
  55 #endif
  56 #endif
  57
  58 /* Get SI_SRPC_DOMAIN, if it is available.  */
  59 #ifdef HAVE_SYS_SYSTEMINFO_H
  60 #include <sys/systeminfo.h>
  61 #endif
  62
  63 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
  64 #include <dos.h>
  65 #include "dosfns.h"
  66 #include "msdos.h"
  67 #include <sys/param.h>
  68 #endif
  69
  70 #include <sys/file.h>
  71 #include <fcntl.h>
  72
  73 #include "systty.h"
  74 #include "syswait.h"
  75
  76 #ifdef HAVE_SYS_UTSNAME_H
  77 #include <sys/utsname.h>
  78 #include <memory.h>
  79 #endif /* HAVE_SYS_UTSNAME_H */
  80
  81 #include "keyboard.h"
  82 #include "frame.h"
  83 #include "window.h"
  84 #include "termhooks.h"
  85 #include "termchar.h"
  86 #include "termopts.h"
  87 #include "dispextern.h"
  88 #include "process.h"
  89 #include "cm.h"  /* for reset_sys_modes */
  90
  91 #ifdef WINDOWSNT
  92 #include <direct.h>
  93 /* In process.h which conflicts with the local copy.  */
  94 #define _P_WAIT 0
  95 int _cdecl _spawnlp (int, const char *, const char *, ...);
  96 int _cdecl _getpid (void);
  97 extern char *getwd (char *);
  98 #endif
  99
 100 #include "syssignal.h"
 101 #include "systime.h"
 102 #ifdef HAVE_UTIME_H
 103 #include <utime.h>
 104 #endif
 105
 106 #ifndef HAVE_UTIMES
 107 #ifndef HAVE_STRUCT_UTIMBUF
 108 /* We want to use utime rather than utimes, but we couldn't find the
 109    structure declaration.  We'll use the traditional one.  */
 110 struct utimbuf {
 111   long actime;
 112   long modtime;
 113 };
 114 #endif
 115 #endif
 116
 117 /* Declare here, including term.h is problematic on some systems.  */
 118 extern void tputs (const char *, int, int (*)(int));
 119
 120 static const int baud_convert[] =
 121   {
 122     0, 50, 75, 110, 135, 150, 200, 300, 600, 1200,
 123     1800, 2400, 4800, 9600, 19200, 38400
 124   };
 125
 126 void croak (char *) NO_RETURN;
 127
 128 /* Temporary used by `sigblock' when defined in terms of signprocmask.  */
 129
 130 SIGMASKTYPE sigprocmask_set;
 131
 132
 133 #if !defined (HAVE_GET_CURRENT_DIR_NAME) || defined (BROKEN_GET_CURRENT_DIR_NAME)
 134
 135 /* Return the current working directory.  Returns NULL on errors.
 136    Any other returned value must be freed with free. This is used
 137    only when get_current_dir_name is not defined on the system.  */
 138 char*
 139 get_current_dir_name (void)
 140 {
 141   char *buf;
 142   char *pwd;
 143   struct stat dotstat, pwdstat;
 144   /* If PWD is accurate, use it instead of calling getwd.  PWD is
 145      sometimes a nicer name, and using it may avoid a fatal error if a
 146      parent directory is searchable but not readable.  */
 147     if ((pwd = getenv ("PWD")) != 0
 148       && (IS_DIRECTORY_SEP (*pwd) || (*pwd && IS_DEVICE_SEP (pwd[1])))
 149       && stat (pwd, &pwdstat) == 0
 150       && stat (".", &dotstat) == 0
 151       && dotstat.st_ino == pwdstat.st_ino
 152       && dotstat.st_dev == pwdstat.st_dev
 153 #ifdef MAXPATHLEN
 154       && strlen (pwd) < MAXPATHLEN
 155 #endif
 156       )
 157     {
 158       buf = (char *) malloc (strlen (pwd) + 1);
 159       if (!buf)
 160         return NULL;
 161       strcpy (buf, pwd);
 162     }
 163 #ifdef HAVE_GETCWD
 164   else
 165     {
 166       size_t buf_size = 1024;
 167       buf = (char *) malloc (buf_size);
 168       if (!buf)
 169         return NULL;
 170       for (;;)
 171         {
 172           if (getcwd (buf, buf_size) == buf)
 173             break;
 174           if (errno != ERANGE)
 175             {
 176               int tmp_errno = errno;
 177               free (buf);
 178               errno = tmp_errno;
 179               return NULL;
 180             }
 181           buf_size *= 2;
 182           buf = (char *) realloc (buf, buf_size);
 183           if (!buf)
 184             return NULL;
 185         }
 186     }
 187 #else
 188   else
 189     {
 190       /* We need MAXPATHLEN here.  */
 191       buf = (char *) malloc (MAXPATHLEN + 1);
 192       if (!buf)
 193         return NULL;
 194       if (getwd (buf) == NULL)
 195         {
 196           int tmp_errno = errno;
 197           free (buf);
 198           errno = tmp_errno;
 199           return NULL;
 200         }
 201     }
 202 #endif
 203   return buf;
 204 }
 205 #endif
 206
 207 \f
 208 /* Discard pending input on all input descriptors.  */
 209
 210 void
 211 discard_tty_input (void)
 212 {
 213 #ifndef WINDOWSNT
 214   struct emacs_tty buf;
 215
 216   if (noninteractive)
 217     return;
 218
 219 #ifdef MSDOS    /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
 220   while (dos_keyread () != -1)
 221     ;
 222 #else /* not MSDOS */
 223   {
 224     struct tty_display_info *tty;
 225     for (tty = tty_list; tty; tty = tty->next)
 226       {
 227         if (tty->input)         /* Is the device suspended? */
 228           {
 229             emacs_get_tty (fileno (tty->input), &buf);
 230             emacs_set_tty (fileno (tty->input), &buf, 0);
 231           }
 232       }
 233   }
 234 #endif /* not MSDOS */
 235 #endif /* not WINDOWSNT */
 236 }
 237
 238 \f
 239 #ifdef SIGTSTP
 240
 241 /* Arrange for character C to be read as the next input from
 242    the terminal.
 243    XXX What if we have multiple ttys?
 244 */
 245
 246 void
 247 stuff_char (char c)
 248 {
 249   if (! FRAME_TERMCAP_P (SELECTED_FRAME ()))
 250     return;
 251
 252 /* Should perhaps error if in batch mode */
 253 #ifdef TIOCSTI
 254   ioctl (fileno (CURTTY()->input), TIOCSTI, &c);
 255 #else /* no TIOCSTI */
 256   error ("Cannot stuff terminal input characters in this version of Unix");
 257 #endif /* no TIOCSTI */
 258 }
 259
 260 #endif /* SIGTSTP */
 261 \f
 262 void
 263 init_baud_rate (int fd)
 264 {
 265   int emacs_ospeed;
 266
 267   if (noninteractive)
 268     emacs_ospeed = 0;
 269   else
 270     {
 271 #ifdef DOS_NT
 272     emacs_ospeed = 15;
 273 #else  /* not DOS_NT */
 274       struct termios sg;
 275
 276       sg.c_cflag = B9600;
 277       tcgetattr (fd, &sg);
 278       emacs_ospeed = cfgetospeed (&sg);
 279 #endif /* not DOS_NT */
 280     }
 281
 282   baud_rate = (emacs_ospeed < sizeof baud_convert / sizeof baud_convert[0]
 283                ? baud_convert[emacs_ospeed] : 9600);
 284   if (baud_rate == 0)
 285     baud_rate = 1200;
 286 }
 287
 288 \f
 289
 290 int wait_debugging;   /* Set nonzero to make following function work under dbx
 291                          (at least for bsd).  */
 292
 293 SIGTYPE
 294 wait_for_termination_signal (void)
 295 {}
 296
 297 #ifndef MSDOS
 298 /* Wait for subprocess with process id `pid' to terminate and
 299    make sure it will get eliminated (not remain forever as a zombie) */
 300
 301 void
 302 wait_for_termination (int pid)
 303 {
 304   while (1)
 305     {
 306 #if defined (BSD_SYSTEM) || defined (HPUX)
 307       /* Note that kill returns -1 even if the process is just a zombie now.
 308          But inevitably a SIGCHLD interrupt should be generated
 309          and child_sig will do wait3 and make the process go away. */
 310       /* There is some indication that there is a bug involved with
 311          termination of subprocesses, perhaps involving a kernel bug too,
 312          but no idea what it is.  Just as a hunch we signal SIGCHLD to see
 313          if that causes the problem to go away or get worse.  */
 314       sigsetmask (sigmask (SIGCHLD));
 315       if (0 > kill (pid, 0))
 316         {
 317           sigsetmask (SIGEMPTYMASK);
 318           kill (getpid (), SIGCHLD);
 319           break;
 320         }
 321       if (wait_debugging)
 322         sleep (1);
 323       else
 324         sigpause (SIGEMPTYMASK);
 325 #else /* not BSD_SYSTEM, and not HPUX version >= 6 */
 326 #ifdef WINDOWSNT
 327       wait (0);
 328       break;
 329 #else /* not WINDOWSNT */
 330       sigblock (sigmask (SIGCHLD));
 331       errno = 0;
 332       if (kill (pid, 0) == -1 && errno == ESRCH)
 333         {
 334           sigunblock (sigmask (SIGCHLD));
 335           break;
 336         }
 337
 338       sigsuspend (&empty_mask);
 339 #endif /* not WINDOWSNT */
 340 #endif /* not BSD_SYSTEM, and not HPUX version >= 6 */
 341     }
 342 }
 343
 344 /*
 345  *      flush any pending output
 346  *      (may flush input as well; it does not matter the way we use it)
 347  */
 348
 349 void
 350 flush_pending_output (int channel)
 351 {
 352   /* FIXME: maybe this function should be removed */
 353 }
 354 \f
 355 /*  Set up the terminal at the other end of a pseudo-terminal that
 356     we will be controlling an inferior through.
 357     It should not echo or do line-editing, since that is done
 358     in Emacs.  No padding needed for insertion into an Emacs buffer.  */
 359
 360 void
 361 child_setup_tty (int out)
 362 {
 363 #ifndef WINDOWSNT
 364   struct emacs_tty s;
 365
 366   emacs_get_tty (out, &s);
 367   s.main.c_oflag |= OPOST;      /* Enable output postprocessing */
 368   s.main.c_oflag &= ~ONLCR;     /* Disable map of NL to CR-NL on output */
 369 #ifdef NLDLY
 370   /* http://lists.gnu.org/archive/html/emacs-devel/2008-05/msg00406.html
 371      Some versions of GNU Hurd do not have FFDLY?  */
 372 #ifdef FFDLY
 373   s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
 374                                 /* No output delays */
 375 #else
 376   s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY);
 377                                 /* No output delays */
 378 #endif
 379 #endif
 380   s.main.c_lflag &= ~ECHO;      /* Disable echo */
 381   s.main.c_lflag |= ISIG;       /* Enable signals */
 382 #ifdef IUCLC
 383   s.main.c_iflag &= ~IUCLC;     /* Disable downcasing on input.  */
 384 #endif
 385 #ifdef ISTRIP
 386   s.main.c_iflag &= ~ISTRIP;    /* don't strip 8th bit on input */
 387 #endif
 388 #ifdef OLCUC
 389   s.main.c_oflag &= ~OLCUC;     /* Disable upcasing on output.  */
 390 #endif
 391   s.main.c_oflag &= ~TAB3;      /* Disable tab expansion */
 392   s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
 393   s.main.c_cc[VERASE] = CDISABLE;       /* disable erase processing */
 394   s.main.c_cc[VKILL] = CDISABLE;        /* disable kill processing */
 395
 396 #ifdef HPUX
 397   s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
 398 #endif /* HPUX */
 399
 400 #ifdef SIGNALS_VIA_CHARACTERS
 401   /* the QUIT and INTR character are used in process_send_signal
 402      so set them here to something useful.  */
 403   if (s.main.c_cc[VQUIT] == CDISABLE)
 404     s.main.c_cc[VQUIT] = '\\'&037;      /* Control-\ */
 405   if (s.main.c_cc[VINTR] == CDISABLE)
 406     s.main.c_cc[VINTR] = 'C'&037;       /* Control-C */
 407 #endif /* not SIGNALS_VIA_CHARACTERS */
 408
 409 #ifdef AIX
 410   /* Also, PTY overloads NUL and BREAK.
 411      don't ignore break, but don't signal either, so it looks like NUL.  */
 412   s.main.c_iflag &= ~IGNBRK;
 413   s.main.c_iflag &= ~BRKINT;
 414   /* rms: Formerly it set s.main.c_cc[VINTR] to 0377 here
 415      unconditionally.  Then a SIGNALS_VIA_CHARACTERS conditional
 416      would force it to 0377.  That looks like duplicated code.  */
 417   s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
 418 #endif /* AIX */
 419
 420   /* We originally enabled ICANON (and set VEOF to 04), and then had
 421      proces.c send additional EOF chars to flush the output when faced
 422      with long lines, but this leads to weird effects when the
 423      subprocess has disabled ICANON and ends up seeing those spurious
 424      extra EOFs.  So we don't send EOFs any more in
 425      process.c:send_process.  First we tried to disable ICANON by
 426      default, so if a subsprocess sets up ICANON, it's his problem (or
 427      the Elisp package that talks to it) to deal with lines that are
 428      too long.  But this disables some features, such as the ability
 429      to send EOF signals.  So we re-enabled ICANON but there is no
 430      more "send eof to flush" going on (which is wrong and unportable
 431      in itself).  The correct way to handle too much output is to
 432      buffer what could not be written and then write it again when
 433      select returns ok for writing.  This has it own set of
 434      problems.  Write is now asynchronous, is that a problem?  How much
 435      do we buffer, and what do we do when that limit is reached?  */
 436
 437   s.main.c_lflag |= ICANON;     /* Enable line editing and eof processing */
 438   s.main.c_cc[VEOF] = 'D'&037;  /* Control-D */
 439 #if 0       /* These settings only apply to non-ICANON mode. */
 440   s.main.c_cc[VMIN] = 1;
 441   s.main.c_cc[VTIME] = 0;
 442 #endif
 443
 444   emacs_set_tty (out, &s, 0);
 445 #endif /* not WINDOWSNT */
 446 }
 447 #endif  /* not MSDOS */
 448
 449 \f
 450 /* Record a signal code and the handler for it.  */
 451 struct save_signal
 452 {
 453   int code;
 454   SIGTYPE (*handler) (int);
 455 };
 456
 457 static void save_signal_handlers (struct save_signal *);
 458 static void restore_signal_handlers (struct save_signal *);
 459
 460 /* Suspend the Emacs process; give terminal to its superior.  */
 461
 462 void
 463 sys_suspend (void)
 464 {
 465 #if defined (SIGTSTP) && !defined (MSDOS)
 466
 467   {
 468     int pgrp = EMACS_GETPGRP (0);
 469     EMACS_KILLPG (pgrp, SIGTSTP);
 470   }
 471
 472 #else /* No SIGTSTP */
 473 /* On a system where suspending is not implemented,
 474    instead fork a subshell and let it talk directly to the terminal
 475    while we wait.  */
 476   sys_subshell ();
 477
 478 #endif /* no SIGTSTP */
 479 }
 480
 481 /* Fork a subshell.  */
 482
 483 void
 484 sys_subshell (void)
 485 {
 486 #ifdef DOS_NT   /* Demacs 1.1.2 91/10/20 Manabu Higashida */
 487   int st;
 488   char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS.  */
 489 #endif
 490   int pid;
 491   struct save_signal saved_handlers[5];
 492   Lisp_Object dir;
 493   unsigned char *str = 0;
 494   int len;
 495
 496   saved_handlers[0].code = SIGINT;
 497   saved_handlers[1].code = SIGQUIT;
 498   saved_handlers[2].code = SIGTERM;
 499 #ifdef SIGIO
 500   saved_handlers[3].code = SIGIO;
 501   saved_handlers[4].code = 0;
 502 #else
 503   saved_handlers[3].code = 0;
 504 #endif
 505
 506   /* Mentioning current_buffer->buffer would mean including buffer.h,
 507      which somehow wedges the hp compiler.  So instead...  */
 508
 509   dir = intern ("default-directory");
 510   if (NILP (Fboundp (dir)))
 511     goto xyzzy;
 512   dir = Fsymbol_value (dir);
 513   if (!STRINGP (dir))
 514     goto xyzzy;
 515
 516   dir = expand_and_dir_to_file (Funhandled_file_name_directory (dir), Qnil);
 517   str = (unsigned char *) alloca (SCHARS (dir) + 2);
 518   len = SCHARS (dir);
 519   memcpy (str, SDATA (dir), len);
 520   if (str[len - 1] != '/') str[len++] = '/';
 521   str[len] = 0;
 522  xyzzy:
 523
 524 #ifdef DOS_NT
 525   pid = 0;
 526   save_signal_handlers (saved_handlers);
 527   synch_process_alive = 1;
 528 #else
 529   pid = vfork ();
 530   if (pid == -1)
 531     error ("Can't spawn subshell");
 532 #endif
 533
 534   if (pid == 0)
 535     {
 536       const char *sh = 0;
 537
 538 #ifdef DOS_NT    /* MW, Aug 1993 */
 539       getwd (oldwd);
 540       if (sh == 0)
 541         sh = (char *) egetenv ("SUSPEND");      /* KFS, 1994-12-14 */
 542 #endif
 543       if (sh == 0)
 544         sh = (char *) egetenv ("SHELL");
 545       if (sh == 0)
 546         sh = "sh";
 547
 548       /* Use our buffer's default directory for the subshell.  */
 549       if (str)
 550         chdir ((char *) str);
 551
 552       close_process_descs ();   /* Close Emacs's pipes/ptys */
 553
 554 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
 555       {
 556         char *epwd = getenv ("PWD");
 557         char old_pwd[MAXPATHLEN+1+4];
 558
 559         /* If PWD is set, pass it with corrected value.  */
 560         if (epwd)
 561           {
 562             strcpy (old_pwd, epwd);
 563             if (str[len - 1] == '/')
 564               str[len - 1] = '\0';
 565             setenv ("PWD", str, 1);
 566           }
 567         st = system (sh);
 568         chdir (oldwd);
 569         if (epwd)
 570           putenv (old_pwd);     /* restore previous value */
 571       }
 572 #else /* not MSDOS */
 573 #ifdef  WINDOWSNT
 574       /* Waits for process completion */
 575       pid = _spawnlp (_P_WAIT, sh, sh, NULL);
 576       chdir (oldwd);
 577       if (pid == -1)
 578         write (1, "Can't execute subshell", 22);
 579 #else   /* not WINDOWSNT */
 580       execlp (sh, sh, (char *) 0);
 581       write (1, "Can't execute subshell", 22);
 582       _exit (1);
 583 #endif  /* not WINDOWSNT */
 584 #endif /* not MSDOS */
 585     }
 586
 587   /* Do this now if we did not do it before.  */
 588 #ifndef MSDOS
 589   save_signal_handlers (saved_handlers);
 590   synch_process_alive = 1;
 591 #endif
 592
 593 #ifndef DOS_NT
 594   wait_for_termination (pid);
 595 #endif
 596   restore_signal_handlers (saved_handlers);
 597   synch_process_alive = 0;
 598 }
 599
 600 static void
 601 save_signal_handlers (struct save_signal *saved_handlers)
 602 {
 603   while (saved_handlers->code)
 604     {
 605       saved_handlers->handler
 606         = (SIGTYPE (*) (int)) signal (saved_handlers->code, SIG_IGN);
 607       saved_handlers++;
 608     }
 609 }
 610
 611 static void
 612 restore_signal_handlers (struct save_signal *saved_handlers)
 613 {
 614   while (saved_handlers->code)
 615     {
 616       signal (saved_handlers->code, saved_handlers->handler);
 617       saved_handlers++;
 618     }
 619 }
 620 \f
 621 #ifndef SIGIO
 622 /* If SIGIO is broken, don't do anything. */
 623 void
 624 init_sigio (int fd)
 625 {
 626 }
 627
 628 void
 629 reset_sigio (int fd)
 630 {
 631 }
 632
 633 void
 634 request_sigio (void)
 635 {
 636 }
 637
 638 void
 639 unrequest_sigio (void)
 640 {
 641 }
 642
 643 #else
 644 #ifdef F_SETFL
 645
 646 int old_fcntl_flags[MAXDESC];
 647
 648 void
 649 init_sigio (int fd)
 650 {
 651 #ifdef FASYNC
 652   old_fcntl_flags[fd] = fcntl (fd, F_GETFL, 0) & ~FASYNC;
 653   fcntl (fd, F_SETFL, old_fcntl_flags[fd] | FASYNC);
 654 #endif
 655   interrupts_deferred = 0;
 656 }
 657
 658 void
 659 reset_sigio (int fd)
 660 {
 661 #ifdef FASYNC
 662   fcntl (fd, F_SETFL, old_fcntl_flags[fd]);
 663 #endif
 664 }
 665
 666 #ifdef FASYNC           /* F_SETFL does not imply existence of FASYNC */
 667 /* XXX Uhm, FASYNC is not used anymore here. */
 668 /* XXX Yeah, but you need it for SIGIO, don't you? */
 669
 670 void
 671 request_sigio (void)
 672 {
 673   if (noninteractive)
 674     return;
 675
 676 #ifdef SIGWINCH
 677   sigunblock (sigmask (SIGWINCH));
 678 #endif
 679   sigunblock (sigmask (SIGIO));
 680
 681   interrupts_deferred = 0;
 682 }
 683
 684 void
 685 unrequest_sigio (void)
 686 {
 687   if (noninteractive)
 688     return;
 689
 690 #if 0 /* XXX What's wrong with blocking SIGIO under X?  */
 691   if (x_display_list)
 692     return;
 693 #endif
 694
 695 #ifdef SIGWINCH
 696   sigblock (sigmask (SIGWINCH));
 697 #endif
 698   sigblock (sigmask (SIGIO));
 699   interrupts_deferred = 1;
 700 }
 701
 702 #else /* no FASYNC */
 703 #ifndef MSDOS
 704
 705 void
 706 request_sigio (void)
 707 {
 708   if (noninteractive || read_socket_hook)
 709     return;
 710
 711   croak ("request_sigio");
 712 }
 713
 714 void
 715 unrequest_sigio (void)
 716 {
 717   if (noninteractive || read_socket_hook)
 718     return;
 719
 720   croak ("unrequest_sigio");
 721 }
 722
 723 #endif /* MSDOS */
 724 #endif /* FASYNC */
 725 #endif /* F_SETFL */
 726 #endif /* SIGIO */
 727
 728 \f
 729 /* Getting and setting emacs_tty structures.  */
 730
 731 /* Set *TC to the parameters associated with the terminal FD.
 732    Return zero if all's well, or -1 if we ran into an error we
 733    couldn't deal with.  */
 734 int
 735 emacs_get_tty (int fd, struct emacs_tty *settings)
 736 {
 737   /* Retrieve the primary parameters - baud rate, character size, etcetera.  */
 738 #ifndef DOS_NT
 739   /* We have those nifty POSIX tcmumbleattr functions.  */
 740   memset (&settings->main, 0, sizeof (settings->main));
 741   if (tcgetattr (fd, &settings->main) < 0)
 742     return -1;
 743 #endif
 744
 745   /* We have survived the tempest.  */
 746   return 0;
 747 }
 748
 749
 750 /* Set the parameters of the tty on FD according to the contents of
 751    *SETTINGS.  If FLUSHP is non-zero, we discard input.
 752    Return 0 if all went well, and -1 if anything failed.  */
 753
 754 int
 755 emacs_set_tty (int fd, struct emacs_tty *settings, int flushp)
 756 {
 757   /* Set the primary parameters - baud rate, character size, etcetera.  */
 758 #ifndef DOS_NT
 759   int i;
 760   /* We have those nifty POSIX tcmumbleattr functions.
 761      William J. Smith <wjs@wiis.wang.com> writes:
 762      "POSIX 1003.1 defines tcsetattr to return success if it was
 763      able to perform any of the requested actions, even if some
 764      of the requested actions could not be performed.
 765      We must read settings back to ensure tty setup properly.
 766      AIX requires this to keep tty from hanging occasionally."  */
 767   /* This make sure that we don't loop indefinitely in here.  */
 768   for (i = 0 ; i < 10 ; i++)
 769     if (tcsetattr (fd, flushp ? TCSAFLUSH : TCSADRAIN, &settings->main) < 0)
 770       {
 771         if (errno == EINTR)
 772           continue;
 773         else
 774           return -1;
 775       }
 776     else
 777       {
 778         struct termios new;
 779
 780         memset (&new, 0, sizeof (new));
 781         /* Get the current settings, and see if they're what we asked for.  */
 782         tcgetattr (fd, &new);
 783         /* We cannot use memcmp on the whole structure here because under
 784          * aix386 the termios structure has some reserved field that may
 785          * not be filled in.
 786          */
 787         if (   new.c_iflag == settings->main.c_iflag
 788             && new.c_oflag == settings->main.c_oflag
 789             && new.c_cflag == settings->main.c_cflag
 790             && new.c_lflag == settings->main.c_lflag
 791             && memcmp (new.c_cc, settings->main.c_cc, NCCS) == 0)
 792           break;
 793         else
 794           continue;
 795       }
 796 #endif
 797
 798   /* We have survived the tempest.  */
 799   return 0;
 800 }
 801
 802 \f
 803
 804 #ifdef F_SETOWN
 805 int old_fcntl_owner[MAXDESC];
 806 #endif /* F_SETOWN */
 807
 808 /* This may also be defined in stdio,
 809    but if so, this does no harm,
 810    and using the same name avoids wasting the other one's space.  */
 811
 812 #if defined (USG)
 813 unsigned char _sobuf[BUFSIZ+8];
 814 #else
 815 char _sobuf[BUFSIZ];
 816 #endif
 817
 818 /* Initialize the terminal mode on all tty devices that are currently
 819    open. */
 820
 821 void
 822 init_all_sys_modes (void)
 823 {
 824   struct tty_display_info *tty;
 825   for (tty = tty_list; tty; tty = tty->next)
 826     init_sys_modes (tty);
 827 }
 828
 829 /* Initialize the terminal mode on the given tty device. */
 830
 831 void
 832 init_sys_modes (struct tty_display_info *tty_out)
 833 {
 834   struct emacs_tty tty;
 835
 836   Vtty_erase_char = Qnil;
 837
 838   if (noninteractive)
 839     return;
 840
 841   if (!tty_out->output)
 842     return;                     /* The tty is suspended. */
 843
 844   if (! tty_out->old_tty)
 845     tty_out->old_tty = (struct emacs_tty *) xmalloc (sizeof (struct emacs_tty));
 846
 847   emacs_get_tty (fileno (tty_out->input), tty_out->old_tty);
 848
 849   tty = *tty_out->old_tty;
 850
 851 #if !defined (DOS_NT)
 852   XSETINT (Vtty_erase_char, tty.main.c_cc[VERASE]);
 853
 854   tty.main.c_iflag |= (IGNBRK); /* Ignore break condition */
 855   tty.main.c_iflag &= ~ICRNL;   /* Disable map of CR to NL on input */
 856 #ifdef INLCR  /* I'm just being cautious,
 857                  since I can't check how widespread INLCR is--rms.  */
 858   tty.main.c_iflag &= ~INLCR;   /* Disable map of NL to CR on input */
 859 #endif
 860 #ifdef ISTRIP
 861   tty.main.c_iflag &= ~ISTRIP;  /* don't strip 8th bit on input */
 862 #endif
 863   tty.main.c_lflag &= ~ECHO;    /* Disable echo */
 864   tty.main.c_lflag &= ~ICANON;  /* Disable erase/kill processing */
 865 #ifdef IEXTEN
 866   tty.main.c_lflag &= ~IEXTEN;  /* Disable other editing characters.  */
 867 #endif
 868   tty.main.c_lflag |= ISIG;     /* Enable signals */
 869   if (tty_out->flow_control)
 870     {
 871       tty.main.c_iflag |= IXON; /* Enable start/stop output control */
 872 #ifdef IXANY
 873       tty.main.c_iflag &= ~IXANY;
 874 #endif /* IXANY */
 875     }
 876   else
 877     tty.main.c_iflag &= ~IXON;  /* Disable start/stop output control */
 878   tty.main.c_oflag &= ~ONLCR;   /* Disable map of NL to CR-NL
 879                                    on output */
 880   tty.main.c_oflag &= ~TAB3;    /* Disable tab expansion */
 881 #ifdef CS8
 882   if (tty_out->meta_key)
 883     {
 884       tty.main.c_cflag |= CS8;  /* allow 8th bit on input */
 885       tty.main.c_cflag &= ~PARENB;/* Don't check parity */
 886     }
 887 #endif
 888   if (tty_out->input == stdin)
 889     {
 890       tty.main.c_cc[VINTR] = quit_char; /* C-g (usually) gives SIGINT */
 891       /* Set up C-g for both SIGQUIT and SIGINT.
 892          We don't know which we will get, but we handle both alike
 893          so which one it really gives us does not matter.  */
 894       tty.main.c_cc[VQUIT] = quit_char;
 895     }
 896   else
 897     {
 898       /* We normally don't get interrupt or quit signals from tty
 899          devices other than our controlling terminal; therefore,
 900          we must handle C-g as normal input.  Unfortunately, this
 901          means that the interrupt and quit feature must be
 902          disabled on secondary ttys, or we would not even see the
 903          keypress.
 904
 905          Note that even though emacsclient could have special code
 906          to pass SIGINT to Emacs, we should _not_ enable
 907          interrupt/quit keys for emacsclient frames.  This means
 908          that we can't break out of loops in C code from a
 909          secondary tty frame, but we can always decide what
 910          display the C-g came from, which is more important from a
 911          usability point of view.  (Consider the case when two
 912          people work together using the same Emacs instance.)  */
 913       tty.main.c_cc[VINTR] = CDISABLE;
 914       tty.main.c_cc[VQUIT] = CDISABLE;
 915     }
 916   tty.main.c_cc[VMIN] = 1;      /* Input should wait for at least 1 char */
 917   tty.main.c_cc[VTIME] = 0;     /* no matter how long that takes.  */
 918 #ifdef VSWTCH
 919   tty.main.c_cc[VSWTCH] = CDISABLE;     /* Turn off shell layering use
 920                                            of C-z */
 921 #endif /* VSWTCH */
 922
 923 #ifdef VSUSP
 924   tty.main.c_cc[VSUSP] = CDISABLE;      /* Turn off handling of C-z.  */
 925 #endif /* VSUSP */
 926 #ifdef V_DSUSP
 927   tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off handling of C-y.  */
 928 #endif /* V_DSUSP */
 929 #ifdef VDSUSP /* Some systems have VDSUSP, some have V_DSUSP.  */
 930   tty.main.c_cc[VDSUSP] = CDISABLE;
 931 #endif /* VDSUSP */
 932 #ifdef VLNEXT
 933   tty.main.c_cc[VLNEXT] = CDISABLE;
 934 #endif /* VLNEXT */
 935 #ifdef VREPRINT
 936   tty.main.c_cc[VREPRINT] = CDISABLE;
 937 #endif /* VREPRINT */
 938 #ifdef VWERASE
 939   tty.main.c_cc[VWERASE] = CDISABLE;
 940 #endif /* VWERASE */
 941 #ifdef VDISCARD
 942   tty.main.c_cc[VDISCARD] = CDISABLE;
 943 #endif /* VDISCARD */
 944
 945   if (tty_out->flow_control)
 946     {
 947 #ifdef VSTART
 948       tty.main.c_cc[VSTART] = '\021';
 949 #endif /* VSTART */
 950 #ifdef VSTOP
 951       tty.main.c_cc[VSTOP] = '\023';
 952 #endif /* VSTOP */
 953     }
 954   else
 955     {
 956 #ifdef VSTART
 957       tty.main.c_cc[VSTART] = CDISABLE;
 958 #endif /* VSTART */
 959 #ifdef VSTOP
 960       tty.main.c_cc[VSTOP] = CDISABLE;
 961 #endif /* VSTOP */
 962     }
 963
 964 #ifdef AIX
 965   tty.main.c_cc[VSTRT] = CDISABLE;
 966   tty.main.c_cc[VSTOP] = CDISABLE;
 967   tty.main.c_cc[VSUSP] = CDISABLE;
 968   tty.main.c_cc[VDSUSP] = CDISABLE;
 969   if (tty_out->flow_control)
 970     {
 971 #ifdef VSTART
 972       tty.main.c_cc[VSTART] = '\021';
 973 #endif /* VSTART */
 974 #ifdef VSTOP
 975       tty.main.c_cc[VSTOP] = '\023';
 976 #endif /* VSTOP */
 977     }
 978   /* Also, PTY overloads NUL and BREAK.
 979      don't ignore break, but don't signal either, so it looks like NUL.
 980      This really serves a purpose only if running in an XTERM window
 981      or via TELNET or the like, but does no harm elsewhere.  */
 982   tty.main.c_iflag &= ~IGNBRK;
 983   tty.main.c_iflag &= ~BRKINT;
 984 #endif
 985 #endif /* not DOS_NT */
 986
 987 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
 988   if (!tty_out->term_initted)
 989     internal_terminal_init ();
 990   dos_ttraw (tty_out);
 991 #endif
 992
 993   emacs_set_tty (fileno (tty_out->input), &tty, 0);
 994
 995   /* This code added to insure that, if flow-control is not to be used,
 996      we have an unlocked terminal at the start. */
 997
 998 #ifdef TCXONC
 999   if (!tty_out->flow_control) ioctl (fileno (tty_out->input), TCXONC, 1);
1000 #endif
1001 #ifdef TIOCSTART
1002   if (!tty_out->flow_control) ioctl (fileno (tty_out->input), TIOCSTART, 0);
1003 #endif
1004
1005 #if !defined (DOS_NT)
1006 #ifdef TCOON
1007   if (!tty_out->flow_control) tcflow (fileno (tty_out->input), TCOON);
1008 #endif
1009 #endif
1010
1011 #ifdef F_SETFL
1012 #ifdef F_GETOWN         /* F_SETFL does not imply existence of F_GETOWN */
1013   if (interrupt_input)
1014     {
1015       old_fcntl_owner[fileno (tty_out->input)] =
1016         fcntl (fileno (tty_out->input), F_GETOWN, 0);
1017       fcntl (fileno (tty_out->input), F_SETOWN, getpid ());
1018       init_sigio (fileno (tty_out->input));
1019 #ifdef HAVE_GPM
1020       if (gpm_tty == tty_out)
1021         {
1022           /* Arrange for mouse events to give us SIGIO signals.  */
1023           fcntl (gpm_fd, F_SETOWN, getpid ());
1024           fcntl (gpm_fd, F_SETFL, fcntl (gpm_fd, F_GETFL, 0) | O_NONBLOCK);
1025           init_sigio (gpm_fd);
1026         }
1027 #endif /* HAVE_GPM */
1028     }
1029 #endif /* F_GETOWN */
1030 #endif /* F_SETFL */
1031
1032 #ifdef _IOFBF
1033   /* This symbol is defined on recent USG systems.
1034      Someone says without this call USG won't really buffer the file
1035      even with a call to setbuf. */
1036   setvbuf (tty_out->output, (char *) _sobuf, _IOFBF, sizeof _sobuf);
1037 #else
1038   setbuf (tty_out->output, (char *) _sobuf);
1039 #endif
1040
1041   if (tty_out->terminal->set_terminal_modes_hook)
1042     tty_out->terminal->set_terminal_modes_hook (tty_out->terminal);
1043
1044   if (!tty_out->term_initted)
1045     {
1046       Lisp_Object tail, frame;
1047       FOR_EACH_FRAME (tail, frame)
1048         {
1049           /* XXX This needs to be revised. */
1050           if (FRAME_TERMCAP_P (XFRAME (frame))
1051               && FRAME_TTY (XFRAME (frame)) == tty_out)
1052             init_frame_faces (XFRAME (frame));
1053         }
1054     }
1055
1056   if (tty_out->term_initted && no_redraw_on_reenter)
1057     {
1058       /* We used to call "direct_output_forward_char(0)" here,
1059          but it's not clear why, since it may not do anything anyway.  */
1060     }
1061   else
1062     {
1063       Lisp_Object tail, frame;
1064       frame_garbaged = 1;
1065       FOR_EACH_FRAME (tail, frame)
1066         {
1067           if ((FRAME_TERMCAP_P (XFRAME (frame))
1068                || FRAME_MSDOS_P (XFRAME (frame)))
1069               && FRAME_TTY (XFRAME (frame)) == tty_out)
1070             FRAME_GARBAGED_P (XFRAME (frame)) = 1;
1071         }
1072     }
1073
1074   tty_out->term_initted = 1;
1075 }
1076
1077 /* Return nonzero if safe to use tabs in output.
1078    At the time this is called, init_sys_modes has not been done yet.  */
1079
1080 int
1081 tabs_safe_p (int fd)
1082 {
1083   struct emacs_tty etty;
1084
1085   emacs_get_tty (fd, &etty);
1086 #ifndef DOS_NT
1087 #ifdef TABDLY
1088   return ((etty.main.c_oflag & TABDLY) != TAB3);
1089 #else /* not TABDLY */
1090   return 1;
1091 #endif /* not TABDLY */
1092 #else /* DOS_NT */
1093   return 0;
1094 #endif /* DOS_NT */
1095 }
1096 \f
1097 /* Get terminal size from system.
1098    Store number of lines into *HEIGHTP and width into *WIDTHP.
1099    We store 0 if there's no valid information.  */
1100
1101 void
1102 get_tty_size (int fd, int *widthp, int *heightp)
1103 {
1104
1105 #ifdef TIOCGWINSZ
1106
1107   /* BSD-style.  */
1108   struct winsize size;
1109
1110   if (ioctl (fd, TIOCGWINSZ, &size) == -1)
1111     *widthp = *heightp = 0;
1112   else
1113     {
1114       *widthp = size.ws_col;
1115       *heightp = size.ws_row;
1116     }
1117
1118 #else
1119 #ifdef TIOCGSIZE
1120
1121   /* SunOS - style.  */
1122   struct ttysize size;
1123
1124   if (ioctl (fd, TIOCGSIZE, &size) == -1)
1125     *widthp = *heightp = 0;
1126   else
1127     {
1128       *widthp = size.ts_cols;
1129       *heightp = size.ts_lines;
1130     }
1131
1132 #else
1133 #ifdef MSDOS
1134   *widthp = ScreenCols ();
1135   *heightp = ScreenRows ();
1136 #else /* system doesn't know size */
1137   *widthp = 0;
1138   *heightp = 0;
1139 #endif
1140 #endif /* not SunOS-style */
1141 #endif /* not BSD-style */
1142 }
1143
1144 /* Set the logical window size associated with descriptor FD
1145    to HEIGHT and WIDTH.  This is used mainly with ptys.  */
1146
1147 int
1148 set_window_size (int fd, int height, int width)
1149 {
1150 #ifdef TIOCSWINSZ
1151
1152   /* BSD-style.  */
1153   struct winsize size;
1154   size.ws_row = height;
1155   size.ws_col = width;
1156
1157   if (ioctl (fd, TIOCSWINSZ, &size) == -1)
1158     return 0; /* error */
1159   else
1160     return 1;
1161
1162 #else
1163 #ifdef TIOCSSIZE
1164
1165   /* SunOS - style.  */
1166   struct ttysize size;
1167   size.ts_lines = height;
1168   size.ts_cols = width;
1169
1170   if (ioctl (fd, TIOCGSIZE, &size) == -1)
1171     return 0;
1172   else
1173     return 1;
1174 #else
1175   return -1;
1176 #endif /* not SunOS-style */
1177 #endif /* not BSD-style */
1178 }
1179
1180 \f
1181
1182 /* Prepare all terminal devices for exiting Emacs. */
1183
1184 void
1185 reset_all_sys_modes (void)
1186 {
1187   struct tty_display_info *tty;
1188   for (tty = tty_list; tty; tty = tty->next)
1189     reset_sys_modes (tty);
1190 }
1191
1192 /* Prepare the terminal for closing it; move the cursor to the
1193    bottom of the frame, turn off interrupt-driven I/O, etc.  */
1194
1195 void
1196 reset_sys_modes (struct tty_display_info *tty_out)
1197 {
1198   if (noninteractive)
1199     {
1200       fflush (stdout);
1201       return;
1202     }
1203   if (!tty_out->term_initted)
1204     return;
1205
1206   if (!tty_out->output)
1207     return;                     /* The tty is suspended. */
1208
1209   /* Go to and clear the last line of the terminal. */
1210
1211   cmgoto (tty_out, FrameRows (tty_out) - 1, 0);
1212
1213   /* Code adapted from tty_clear_end_of_line. */
1214   if (tty_out->TS_clr_line)
1215     {
1216       emacs_tputs (tty_out, tty_out->TS_clr_line, 1, cmputc);
1217     }
1218   else
1219     {                   /* have to do it the hard way */
1220       int i;
1221       tty_turn_off_insert (tty_out);
1222
1223       for (i = curX (tty_out); i < FrameCols (tty_out) - 1; i++)
1224         {
1225           fputc (' ', tty_out->output);
1226         }
1227     }
1228
1229   cmgoto (tty_out, FrameRows (tty_out) - 1, 0);
1230   fflush (tty_out->output);
1231
1232   if (tty_out->terminal->reset_terminal_modes_hook)
1233     tty_out->terminal->reset_terminal_modes_hook (tty_out->terminal);
1234
1235 #ifdef BSD_SYSTEM
1236   /* Avoid possible loss of output when changing terminal modes.  */
1237   fsync (fileno (tty_out->output));
1238 #endif
1239
1240 #ifdef F_SETFL
1241 #ifdef F_SETOWN         /* F_SETFL does not imply existence of F_SETOWN */
1242   if (interrupt_input)
1243     {
1244       reset_sigio (fileno (tty_out->input));
1245       fcntl (fileno (tty_out->input), F_SETOWN,
1246              old_fcntl_owner[fileno (tty_out->input)]);
1247     }
1248 #endif /* F_SETOWN */
1249 #ifdef O_NDELAY
1250   fcntl (fileno (tty_out->input), F_SETFL,
1251          fcntl (fileno (tty_out->input), F_GETFL, 0) & ~O_NDELAY);
1252 #endif
1253 #endif /* F_SETFL */
1254
1255   if (tty_out->old_tty)
1256     while (emacs_set_tty (fileno (tty_out->input),
1257                           tty_out->old_tty, 0) < 0 && errno == EINTR)
1258       ;
1259
1260 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
1261   dos_ttcooked ();
1262 #endif
1263
1264 }
1265 \f
1266 #ifdef HAVE_PTYS
1267
1268 /* Set up the proper status flags for use of a pty.  */
1269
1270 void
1271 setup_pty (int fd)
1272 {
1273   /* I'm told that TOICREMOTE does not mean control chars
1274      "can't be sent" but rather that they don't have
1275      input-editing or signaling effects.
1276      That should be good, because we have other ways
1277      to do those things in Emacs.
1278      However, telnet mode seems not to work on 4.2.
1279      So TIOCREMOTE is turned off now. */
1280
1281   /* Under hp-ux, if TIOCREMOTE is turned on, some calls
1282      will hang.  In particular, the "timeout" feature (which
1283      causes a read to return if there is no data available)
1284      does this.  Also it is known that telnet mode will hang
1285      in such a way that Emacs must be stopped (perhaps this
1286      is the same problem).
1287
1288      If TIOCREMOTE is turned off, then there is a bug in
1289      hp-ux which sometimes loses data.  Apparently the
1290      code which blocks the master process when the internal
1291      buffer fills up does not work.  Other than this,
1292      though, everything else seems to work fine.
1293
1294      Since the latter lossage is more benign, we may as well
1295      lose that way.  -- cph */
1296 #ifdef FIONBIO
1297 #if defined(UNIX98_PTYS)
1298   {
1299     int on = 1;
1300     ioctl (fd, FIONBIO, &on);
1301   }
1302 #endif
1303 #endif
1304 }
1305 #endif /* HAVE_PTYS */
1306 \f
1307 #ifdef HAVE_SOCKETS
1308 #include <sys/socket.h>
1309 #include <netdb.h>
1310 #endif /* HAVE_SOCKETS */
1311
1312 #ifdef TRY_AGAIN
1313 #ifndef HAVE_H_ERRNO
1314 extern int h_errno;
1315 #endif
1316 #endif /* TRY_AGAIN */
1317
1318 void
1319 init_system_name (void)
1320 {
1321 #ifndef HAVE_GETHOSTNAME
1322   struct utsname uts;
1323   uname (&uts);
1324   Vsystem_name = build_string (uts.nodename);
1325 #else /* HAVE_GETHOSTNAME */
1326   unsigned int hostname_size = 256;
1327   char *hostname = (char *) alloca (hostname_size);
1328
1329   /* Try to get the host name; if the buffer is too short, try
1330      again.  Apparently, the only indication gethostname gives of
1331      whether the buffer was large enough is the presence or absence
1332      of a '\0' in the string.  Eech.  */
1333   for (;;)
1334     {
1335       gethostname (hostname, hostname_size - 1);
1336       hostname[hostname_size - 1] = '\0';
1337
1338       /* Was the buffer large enough for the '\0'?  */
1339       if (strlen (hostname) < hostname_size - 1)
1340         break;
1341
1342       hostname_size <<= 1;
1343       hostname = (char *) alloca (hostname_size);
1344     }
1345 #ifdef HAVE_SOCKETS
1346   /* Turn the hostname into the official, fully-qualified hostname.
1347      Don't do this if we're going to dump; this can confuse system
1348      libraries on some machines and make the dumped emacs core dump. */
1349 #ifndef CANNOT_DUMP
1350   if (initialized)
1351 #endif /* not CANNOT_DUMP */
1352     if (! strchr (hostname, '.'))
1353       {
1354         int count;
1355 #ifdef HAVE_GETADDRINFO
1356         struct addrinfo *res;
1357         struct addrinfo hints;
1358         int ret;
1359
1360         memset (&hints, 0, sizeof (hints));
1361         hints.ai_socktype = SOCK_STREAM;
1362         hints.ai_flags = AI_CANONNAME;
1363
1364         for (count = 0;; count++)
1365           {
1366             if ((ret = getaddrinfo (hostname, NULL, &hints, &res)) == 0
1367                 || ret != EAI_AGAIN)
1368               break;
1369
1370             if (count >= 5)
1371               break;
1372             Fsleep_for (make_number (1), Qnil);
1373           }
1374
1375         if (ret == 0)
1376           {
1377             struct addrinfo *it = res;
1378             while (it)
1379               {
1380                 char *fqdn = it->ai_canonname;
1381                 if (fqdn && strchr (fqdn, '.')
1382                     && strcmp (fqdn, "localhost.localdomain") != 0)
1383                   break;
1384                 it = it->ai_next;
1385               }
1386             if (it)
1387               {
1388                 hostname = alloca (strlen (it->ai_canonname) + 1);
1389                 strcpy (hostname, it->ai_canonname);
1390               }
1391             freeaddrinfo (res);
1392           }
1393 #else /* !HAVE_GETADDRINFO */
1394         struct hostent *hp;
1395         for (count = 0;; count++)
1396           {
1397
1398 #ifdef TRY_AGAIN
1399             h_errno = 0;
1400 #endif
1401             hp = gethostbyname (hostname);
1402 #ifdef TRY_AGAIN
1403             if (! (hp == 0 && h_errno == TRY_AGAIN))
1404 #endif
1405
1406               break;
1407
1408             if (count >= 5)
1409               break;
1410             Fsleep_for (make_number (1), Qnil);
1411           }
1412
1413         if (hp)
1414           {
1415             char *fqdn = (char *) hp->h_name;
1416
1417             if (!strchr (fqdn, '.'))
1418               {
1419                 /* We still don't have a fully qualified domain name.
1420                    Try to find one in the list of alternate names */
1421                 char **alias = hp->h_aliases;
1422                 while (*alias
1423                        && (!strchr (*alias, '.')
1424                            || !strcmp (*alias, "localhost.localdomain")))
1425                   alias++;
1426                 if (*alias)
1427                   fqdn = *alias;
1428               }
1429             hostname = fqdn;
1430           }
1431 #endif /* !HAVE_GETADDRINFO */
1432       }
1433 #endif /* HAVE_SOCKETS */
1434   Vsystem_name = build_string (hostname);
1435 #endif /* HAVE_GETHOSTNAME */
1436   {
1437     unsigned char *p;
1438     for (p = SDATA (Vsystem_name); *p; p++)
1439       if (*p == ' ' || *p == '\t')
1440         *p = '-';
1441   }
1442 }
1443 \f
1444 /* POSIX signals support - DJB */
1445 /* Anyone with POSIX signals should have ANSI C declarations */
1446
1447 sigset_t empty_mask, full_mask;
1448
1449 #ifndef WINDOWSNT
1450
1451 signal_handler_t
1452 sys_signal (int signal_number, signal_handler_t action)
1453 {
1454   struct sigaction new_action, old_action;
1455   sigemptyset (&new_action.sa_mask);
1456   new_action.sa_handler = action;
1457   new_action.sa_flags = 0;
1458 #if defined (SA_RESTART)
1459   /* Emacs mostly works better with restartable system services. If this
1460      flag exists, we probably want to turn it on here.
1461      However, on some systems this resets the timeout of `select'
1462      which means that `select' never finishes if it keeps getting signals.
1463      BROKEN_SA_RESTART is defined on those systems.  */
1464   /* It's not clear why the comment above says "mostly works better".  --Stef
1465      When SYNC_INPUT is set, we don't want SA_RESTART because we need to poll
1466      for pending input so we need long-running syscalls to be interrupted
1467      after a signal that sets the interrupt_input_pending flag.  */
1468   /* Non-interactive keyboard input goes through stdio, where we always
1469      want restartable system calls.  */
1470 # if defined (BROKEN_SA_RESTART) || defined(SYNC_INPUT)
1471   if (noninteractive)
1472 # endif
1473     new_action.sa_flags = SA_RESTART;
1474 #endif
1475   sigaction (signal_number, &new_action, &old_action);
1476   return (old_action.sa_handler);
1477 }
1478
1479 #endif  /* WINDOWSNT */
1480
1481 #ifndef __GNUC__
1482 /* If we're compiling with GCC, we don't need this function, since it
1483    can be written as a macro.  */
1484 sigset_t
1485 sys_sigmask (int sig)
1486 {
1487   sigset_t mask;
1488   sigemptyset (&mask);
1489   sigaddset (&mask, sig);
1490   return mask;
1491 }
1492 #endif
1493
1494 /* I'd like to have these guys return pointers to the mask storage in here,
1495    but there'd be trouble if the code was saving multiple masks.  I'll be
1496    safe and pass the structure.  It normally won't be more than 2 bytes
1497    anyhow. - DJB */
1498
1499 sigset_t
1500 sys_sigblock (sigset_t new_mask)
1501 {
1502   sigset_t old_mask;
1503   sigprocmask (SIG_BLOCK, &new_mask, &old_mask);
1504   return (old_mask);
1505 }
1506
1507 sigset_t
1508 sys_sigunblock (sigset_t new_mask)
1509 {
1510   sigset_t old_mask;
1511   sigprocmask (SIG_UNBLOCK, &new_mask, &old_mask);
1512   return (old_mask);
1513 }
1514
1515 sigset_t
1516 sys_sigsetmask (sigset_t new_mask)
1517 {
1518   sigset_t old_mask;
1519   sigprocmask (SIG_SETMASK, &new_mask, &old_mask);
1520   return (old_mask);
1521 }
1522
1523 \f
1524 #if !defined HAVE_STRSIGNAL && !HAVE_DECL_SYS_SIGLIST
1525 static char *my_sys_siglist[NSIG];
1526 # ifdef sys_siglist
1527 #  undef sys_siglist
1528 # endif
1529 # define sys_siglist my_sys_siglist
1530 #endif
1531
1532 void
1533 init_signals (void)
1534 {
1535   sigemptyset (&empty_mask);
1536   sigfillset (&full_mask);
1537
1538 #if !defined HAVE_STRSIGNAL && !HAVE_DECL_SYS_SIGLIST
1539   if (! initialized)
1540     {
1541 # ifdef SIGABRT
1542       sys_siglist[SIGABRT] = "Aborted";
1543 # endif
1544 # ifdef SIGAIO
1545       sys_siglist[SIGAIO] = "LAN I/O interrupt";
1546 # endif
1547 # ifdef SIGALRM
1548       sys_siglist[SIGALRM] = "Alarm clock";
1549 # endif
1550 # ifdef SIGBUS
1551       sys_siglist[SIGBUS] = "Bus error";
1552 # endif
1553 # ifdef SIGCLD
1554       sys_siglist[SIGCLD] = "Child status changed";
1555 # endif
1556 # ifdef SIGCHLD
1557       sys_siglist[SIGCHLD] = "Child status changed";
1558 # endif
1559 # ifdef SIGCONT
1560       sys_siglist[SIGCONT] = "Continued";
1561 # endif
1562 # ifdef SIGDANGER
1563       sys_siglist[SIGDANGER] = "Swap space dangerously low";
1564 # endif
1565 # ifdef SIGDGNOTIFY
1566       sys_siglist[SIGDGNOTIFY] = "Notification message in queue";
1567 # endif
1568 # ifdef SIGEMT
1569       sys_siglist[SIGEMT] = "Emulation trap";
1570 # endif
1571 # ifdef SIGFPE
1572       sys_siglist[SIGFPE] = "Arithmetic exception";
1573 # endif
1574 # ifdef SIGFREEZE
1575       sys_siglist[SIGFREEZE] = "SIGFREEZE";
1576 # endif
1577 # ifdef SIGGRANT
1578       sys_siglist[SIGGRANT] = "Monitor mode granted";
1579 # endif
1580 # ifdef SIGHUP
1581       sys_siglist[SIGHUP] = "Hangup";
1582 # endif
1583 # ifdef SIGILL
1584       sys_siglist[SIGILL] = "Illegal instruction";
1585 # endif
1586 # ifdef SIGINT
1587       sys_siglist[SIGINT] = "Interrupt";
1588 # endif
1589 # ifdef SIGIO
1590       sys_siglist[SIGIO] = "I/O possible";
1591 # endif
1592 # ifdef SIGIOINT
1593       sys_siglist[SIGIOINT] = "I/O intervention required";
1594 # endif
1595 # ifdef SIGIOT
1596       sys_siglist[SIGIOT] = "IOT trap";
1597 # endif
1598 # ifdef SIGKILL
1599       sys_siglist[SIGKILL] = "Killed";
1600 # endif
1601 # ifdef SIGLOST
1602       sys_siglist[SIGLOST] = "Resource lost";
1603 # endif
1604 # ifdef SIGLWP
1605       sys_siglist[SIGLWP] = "SIGLWP";
1606 # endif
1607 # ifdef SIGMSG
1608       sys_siglist[SIGMSG] = "Monitor mode data available";
1609 # endif
1610 # ifdef SIGPHONE
1611       sys_siglist[SIGWIND] = "SIGPHONE";
1612 # endif
1613 # ifdef SIGPIPE
1614       sys_siglist[SIGPIPE] = "Broken pipe";
1615 # endif
1616 # ifdef SIGPOLL
1617       sys_siglist[SIGPOLL] = "Pollable event occurred";
1618 # endif
1619 # ifdef SIGPROF
1620       sys_siglist[SIGPROF] = "Profiling timer expired";
1621 # endif
1622 # ifdef SIGPTY
1623       sys_siglist[SIGPTY] = "PTY I/O interrupt";
1624 # endif
1625 # ifdef SIGPWR
1626       sys_siglist[SIGPWR] = "Power-fail restart";
1627 # endif
1628 # ifdef SIGQUIT
1629       sys_siglist[SIGQUIT] = "Quit";
1630 # endif
1631 # ifdef SIGRETRACT
1632       sys_siglist[SIGRETRACT] = "Need to relinguish monitor mode";
1633 # endif
1634 # ifdef SIGSAK
1635       sys_siglist[SIGSAK] = "Secure attention";
1636 # endif
1637 # ifdef SIGSEGV
1638       sys_siglist[SIGSEGV] = "Segmentation violation";
1639 # endif
1640 # ifdef SIGSOUND
1641       sys_siglist[SIGSOUND] = "Sound completed";
1642 # endif
1643 # ifdef SIGSTOP
1644       sys_siglist[SIGSTOP] = "Stopped (signal)";
1645 # endif
1646 # ifdef SIGSTP
1647       sys_siglist[SIGSTP] = "Stopped (user)";
1648 # endif
1649 # ifdef SIGSYS
1650       sys_siglist[SIGSYS] = "Bad argument to system call";
1651 # endif
1652 # ifdef SIGTERM
1653       sys_siglist[SIGTERM] = "Terminated";
1654 # endif
1655 # ifdef SIGTHAW
1656       sys_siglist[SIGTHAW] = "SIGTHAW";
1657 # endif
1658 # ifdef SIGTRAP
1659       sys_siglist[SIGTRAP] = "Trace/breakpoint trap";
1660 # endif
1661 # ifdef SIGTSTP
1662       sys_siglist[SIGTSTP] = "Stopped (user)";
1663 # endif
1664 # ifdef SIGTTIN
1665       sys_siglist[SIGTTIN] = "Stopped (tty input)";
1666 # endif
1667 # ifdef SIGTTOU
1668       sys_siglist[SIGTTOU] = "Stopped (tty output)";
1669 # endif
1670 # ifdef SIGURG
1671       sys_siglist[SIGURG] = "Urgent I/O condition";
1672 # endif
1673 # ifdef SIGUSR1
1674       sys_siglist[SIGUSR1] = "User defined signal 1";
1675 # endif
1676 # ifdef SIGUSR2
1677       sys_siglist[SIGUSR2] = "User defined signal 2";
1678 # endif
1679 # ifdef SIGVTALRM
1680       sys_siglist[SIGVTALRM] = "Virtual timer expired";
1681 # endif
1682 # ifdef SIGWAITING
1683       sys_siglist[SIGWAITING] = "Process's LWPs are blocked";
1684 # endif
1685 # ifdef SIGWINCH
1686       sys_siglist[SIGWINCH] = "Window size changed";
1687 # endif
1688 # ifdef SIGWIND
1689       sys_siglist[SIGWIND] = "SIGWIND";
1690 # endif
1691 # ifdef SIGXCPU
1692       sys_siglist[SIGXCPU] = "CPU time limit exceeded";
1693 # endif
1694 # ifdef SIGXFSZ
1695       sys_siglist[SIGXFSZ] = "File size limit exceeded";
1696 # endif
1697     }
1698 #endif /* !defined HAVE_STRSIGNAL && !defined HAVE_DECL_SYS_SIGLIST */
1699 }
1700 \f
1701 #ifndef HAVE_RANDOM
1702 #ifdef random
1703 #define HAVE_RANDOM
1704 #endif
1705 #endif
1706
1707 /* Figure out how many bits the system's random number generator uses.
1708    `random' and `lrand48' are assumed to return 31 usable bits.
1709    BSD `rand' returns a 31 bit value but the low order bits are unusable;
1710    so we'll shift it and treat it like the 15-bit USG `rand'.  */
1711
1712 #ifndef RAND_BITS
1713 # ifdef HAVE_RANDOM
1714 #  define RAND_BITS 31
1715 # else /* !HAVE_RANDOM */
1716 #  ifdef HAVE_LRAND48
1717 #   define RAND_BITS 31
1718 #   define random lrand48
1719 #  else /* !HAVE_LRAND48 */
1720 #   define RAND_BITS 15
1721 #   if RAND_MAX == 32767
1722 #    define random rand
1723 #   else /* RAND_MAX != 32767 */
1724 #    if RAND_MAX == 2147483647
1725 #     define random() (rand () >> 16)
1726 #    else /* RAND_MAX != 2147483647 */
1727 #     ifdef USG
1728 #      define random rand
1729 #     else
1730 #      define random() (rand () >> 16)
1731 #     endif /* !USG */
1732 #    endif /* RAND_MAX != 2147483647 */
1733 #   endif /* RAND_MAX != 32767 */
1734 #  endif /* !HAVE_LRAND48 */
1735 # endif /* !HAVE_RANDOM */
1736 #endif /* !RAND_BITS */
1737
1738 void
1739 seed_random (long int arg)
1740 {
1741 #ifdef HAVE_RANDOM
1742   srandom ((unsigned int)arg);
1743 #else
1744 # ifdef HAVE_LRAND48
1745   srand48 (arg);
1746 # else
1747   srand ((unsigned int)arg);
1748 # endif
1749 #endif
1750 }
1751
1752 /*
1753  * Build a full Emacs-sized word out of whatever we've got.
1754  * This suffices even for a 64-bit architecture with a 15-bit rand.
1755  */
1756 long
1757 get_random (void)
1758 {
1759   long val = random ();
1760 #if VALBITS > RAND_BITS
1761   val = (val << RAND_BITS) ^ random ();
1762 #if VALBITS > 2*RAND_BITS
1763   val = (val << RAND_BITS) ^ random ();
1764 #if VALBITS > 3*RAND_BITS
1765   val = (val << RAND_BITS) ^ random ();
1766 #if VALBITS > 4*RAND_BITS
1767   val = (val << RAND_BITS) ^ random ();
1768 #endif /* need at least 5 */
1769 #endif /* need at least 4 */
1770 #endif /* need at least 3 */
1771 #endif /* need at least 2 */
1772   return val & ((1L << VALBITS) - 1);
1773 }
1774
1775 #ifndef HAVE_STRERROR
1776 #ifndef WINDOWSNT
1777 char *
1778 strerror (errnum)
1779      int errnum;
1780 {
1781   extern char *sys_errlist[];
1782   extern int sys_nerr;
1783
1784   if (errnum >= 0 && errnum < sys_nerr)
1785     return sys_errlist[errnum];
1786   return (char *) "Unknown error";
1787 }
1788 #endif /* not WINDOWSNT */
1789 #endif /* ! HAVE_STRERROR */
1790 \f
1791 int
1792 emacs_open (const char *path, int oflag, int mode)
1793 {
1794   register int rtnval;
1795
1796   while ((rtnval = open (path, oflag, mode)) == -1
1797          && (errno == EINTR))
1798     QUIT;
1799   return (rtnval);
1800 }
1801
1802 int
1803 emacs_close (int fd)
1804 {
1805   int did_retry = 0;
1806   register int rtnval;
1807
1808   while ((rtnval = close (fd)) == -1
1809          && (errno == EINTR))
1810     did_retry = 1;
1811
1812   /* If close is interrupted SunOS 4.1 may or may not have closed the
1813      file descriptor.  If it did the second close will fail with
1814      errno = EBADF.  That means we have succeeded.  */
1815   if (rtnval == -1 && did_retry && errno == EBADF)
1816     return 0;
1817
1818   return rtnval;
1819 }
1820
1821 int
1822 emacs_read (int fildes, char *buf, unsigned int nbyte)
1823 {
1824   register int rtnval;
1825
1826   while ((rtnval = read (fildes, buf, nbyte)) == -1
1827          && (errno == EINTR))
1828     QUIT;
1829   return (rtnval);
1830 }
1831
1832 int
1833 emacs_write (int fildes, const char *buf, unsigned int nbyte)
1834 {
1835   register int rtnval, bytes_written;
1836
1837   bytes_written = 0;
1838
1839   while (nbyte > 0)
1840     {
1841       rtnval = write (fildes, buf, nbyte);
1842
1843       if (rtnval == -1)
1844         {
1845           if (errno == EINTR)
1846             {
1847 #ifdef SYNC_INPUT
1848               /* I originally used `QUIT' but that might causes files to
1849                  be truncated if you hit C-g in the middle of it.  --Stef  */
1850               process_pending_signals ();
1851 #endif
1852               continue;
1853             }
1854           else
1855             return (bytes_written ? bytes_written : -1);
1856         }
1857
1858       buf += rtnval;
1859       nbyte -= rtnval;
1860       bytes_written += rtnval;
1861     }
1862   return (bytes_written);
1863 }
1864 \f
1865 #ifdef USG
1866 /*
1867  *      All of the following are for USG.
1868  *
1869  *      On USG systems the system calls are INTERRUPTIBLE by signals
1870  *      that the user program has elected to catch.  Thus the system call
1871  *      must be retried in these cases.  To handle this without massive
1872  *      changes in the source code, we remap the standard system call names
1873  *      to names for our own functions in sysdep.c that do the system call
1874  *      with retries.  Actually, for portability reasons, it is good
1875  *      programming practice, as this example shows, to limit all actual
1876  *      system calls to a single occurrence in the source.  Sure, this
1877  *      adds an extra level of function call overhead but it is almost
1878  *      always negligible.   Fred Fish, Unisoft Systems Inc.
1879  */
1880
1881 /*
1882  *      Warning, this function may not duplicate 4.2 action properly
1883  *      under error conditions.
1884  */
1885
1886 #ifndef MAXPATHLEN
1887 /* In 4.1, param.h fails to define this.  */
1888 #define MAXPATHLEN 1024
1889 #endif
1890
1891 #ifndef HAVE_GETWD
1892
1893 char *
1894 getwd (char *pathname)
1895 {
1896   char *npath, *spath;
1897   extern char *getcwd (char *, size_t);
1898
1899   BLOCK_INPUT;                  /* getcwd uses malloc */
1900   spath = npath = getcwd ((char *) 0, MAXPATHLEN);
1901   if (spath == 0)
1902     {
1903       UNBLOCK_INPUT;
1904       return spath;
1905     }
1906   /* On Altos 3068, getcwd can return @hostname/dir, so discard
1907      up to first slash.  Should be harmless on other systems.  */
1908   while (*npath && *npath != '/')
1909     npath++;
1910   strcpy (pathname, npath);
1911   free (spath);                 /* getcwd uses malloc */
1912   UNBLOCK_INPUT;
1913   return pathname;
1914 }
1915
1916 #endif /* HAVE_GETWD */
1917
1918 /*
1919  *      Emulate rename using unlink/link.  Note that this is
1920  *      only partially correct.  Also, doesn't enforce restriction
1921  *      that files be of same type (regular->regular, dir->dir, etc).
1922  */
1923
1924 #ifndef HAVE_RENAME
1925
1926 int
1927 rename (const char *from, const char *to)
1928 {
1929   if (access (from, 0) == 0)
1930     {
1931       unlink (to);
1932       if (link (from, to) == 0)
1933         if (unlink (from) == 0)
1934           return (0);
1935     }
1936   return (-1);
1937 }
1938
1939 #endif
1940
1941
1942 #if defined(HPUX) && !defined(HAVE_PERROR)
1943
1944 /* HPUX curses library references perror, but as far as we know
1945    it won't be called.  Anyway this definition will do for now.  */
1946
1947 void
1948 perror (void)
1949 {
1950 }
1951 #endif /* HPUX and not HAVE_PERROR */
1952
1953 #ifndef HAVE_DUP2
1954
1955 /*
1956  *      Emulate BSD dup2.  First close newd if it already exists.
1957  *      Then, attempt to dup oldd.  If not successful, call dup2 recursively
1958  *      until we are, then close the unsuccessful ones.
1959  */
1960
1961 int
1962 dup2 (int oldd, int newd)
1963 {
1964   register int fd, ret;
1965
1966   emacs_close (newd);
1967
1968 #ifdef F_DUPFD
1969   return fcntl (oldd, F_DUPFD, newd);
1970 #else
1971   fd = dup (old);
1972   if (fd == -1)
1973     return -1;
1974   if (fd == new)
1975     return new;
1976   ret = dup2 (old,new);
1977   emacs_close (fd);
1978   return ret;
1979 #endif
1980 }
1981
1982 #endif /* not HAVE_DUP2 */
1983
1984 /*
1985  *      Gettimeofday.  Simulate as much as possible.  Only accurate
1986  *      to nearest second.  Emacs doesn't use tzp so ignore it for now.
1987  *      Only needed when subprocesses are defined.
1988  */
1989
1990 #ifndef HAVE_GETTIMEOFDAY
1991 #ifdef HAVE_TIMEVAL
1992
1993 int
1994 gettimeofday (struct timeval *tp, struct timezone *tzp)
1995 {
1996   extern long time (long);
1997
1998   tp->tv_sec = time ((long *)0);
1999   tp->tv_usec = 0;
2000   if (tzp != 0)
2001     tzp->tz_minuteswest = -1;
2002   return 0;
2003 }
2004
2005 #endif
2006 #endif /* !HAVE_GETTIMEOFDAY && HAVE_TIMEVAL */
2007
2008 /*
2009  *      This function will go away as soon as all the stubs fixed. (fnf)
2010  */
2011
2012 void
2013 croak (char *badfunc)
2014 {
2015   printf ("%s not yet implemented\r\n", badfunc);
2016   reset_all_sys_modes ();
2017   exit (1);
2018 }
2019
2020 #endif /* USG */
2021 \f
2022 /* Directory routines for systems that don't have them. */
2023
2024 #ifdef HAVE_DIRENT_H
2025
2026 #include <dirent.h>
2027
2028 #if !defined (HAVE_CLOSEDIR)
2029
2030 int
2031 closedir (DIR *dirp /* stream from opendir */)
2032 {
2033   int rtnval;
2034
2035   rtnval = emacs_close (dirp->dd_fd);
2036   xfree ((char *) dirp);
2037
2038   return rtnval;
2039 }
2040 #endif /* not HAVE_CLOSEDIR */
2041 #endif /* HAVE_DIRENT_H */
2042
2043 \f
2044 int
2045 set_file_times (const char *filename, EMACS_TIME atime, EMACS_TIME mtime)
2046 {
2047 #ifdef HAVE_UTIMES
2048   struct timeval tv[2];
2049   tv[0] = atime;
2050   tv[1] = mtime;
2051   return utimes (filename, tv);
2052 #else /* not HAVE_UTIMES */
2053   struct utimbuf utb;
2054   utb.actime = EMACS_SECS (atime);
2055   utb.modtime = EMACS_SECS (mtime);
2056   return utime (filename, &utb);
2057 #endif /* not HAVE_UTIMES */
2058 }
2059 \f
2060 /* mkdir and rmdir functions, for systems which don't have them.  */
2061
2062 #ifndef HAVE_MKDIR
2063 /*
2064  * Written by Robert Rother, Mariah Corporation, August 1985.
2065  *
2066  * If you want it, it's yours.  All I ask in return is that if you
2067  * figure out how to do this in a Bourne Shell script you send me
2068  * a copy.
2069  *                                      sdcsvax!rmr or rmr@uscd
2070  *
2071  * Severely hacked over by John Gilmore to make a 4.2BSD compatible
2072  * subroutine.  11Mar86; hoptoad!gnu
2073  *
2074  * Modified by rmtodd@uokmax 6-28-87 -- when making an already existing dir,
2075  * subroutine didn't return EEXIST.  It does now.
2076  */
2077
2078 /*
2079  * Make a directory.
2080  */
2081 int
2082 mkdir (char *dpath, int dmode)
2083 {
2084   int cpid, status, fd;
2085   struct stat statbuf;
2086
2087   if (stat (dpath, &statbuf) == 0)
2088     {
2089       errno = EEXIST;           /* Stat worked, so it already exists */
2090       return -1;
2091     }
2092
2093   /* If stat fails for a reason other than non-existence, return error */
2094   if (errno != ENOENT)
2095     return -1;
2096
2097   synch_process_alive = 1;
2098   switch (cpid = fork ())
2099     {
2100
2101     case -1:                    /* Error in fork */
2102       return (-1);              /* Errno is set already */
2103
2104     case 0:                     /* Child process */
2105       /*
2106                  * Cheap hack to set mode of new directory.  Since this
2107                  * child process is going away anyway, we zap its umask.
2108                  * FIXME, this won't suffice to set SUID, SGID, etc. on this
2109                  * directory.  Does anybody care?
2110                  */
2111       status = umask (0);       /* Get current umask */
2112       status = umask (status | (0777 & ~dmode));        /* Set for mkdir */
2113       fd = emacs_open ("/dev/null", O_RDWR, 0);
2114       if (fd >= 0)
2115         {
2116           dup2 (fd, 0);
2117           dup2 (fd, 1);
2118           dup2 (fd, 2);
2119         }
2120       execl ("/bin/mkdir", "mkdir", dpath, (char *) 0);
2121       _exit (-1);               /* Can't exec /bin/mkdir */
2122
2123     default:                    /* Parent process */
2124       wait_for_termination (cpid);
2125     }
2126
2127   if (synch_process_death != 0 || synch_process_retcode != 0
2128       || synch_process_termsig != 0)
2129     {
2130       errno = EIO;              /* We don't know why, but */
2131       return -1;                /* /bin/mkdir failed */
2132     }
2133
2134   return 0;
2135 }
2136 #endif /* not HAVE_MKDIR */
2137
2138 #ifndef HAVE_RMDIR
2139 int
2140 rmdir (char *dpath)
2141 {
2142   int cpid, status, fd;
2143   struct stat statbuf;
2144
2145   if (stat (dpath, &statbuf) != 0)
2146     {
2147       /* Stat just set errno.  We don't have to */
2148       return -1;
2149     }
2150
2151   synch_process_alive = 1;
2152   switch (cpid = fork ())
2153     {
2154
2155     case -1:                    /* Error in fork */
2156       return (-1);              /* Errno is set already */
2157
2158     case 0:                     /* Child process */
2159       fd = emacs_open ("/dev/null", O_RDWR, 0);
2160       if (fd >= 0)
2161         {
2162           dup2 (fd, 0);
2163           dup2 (fd, 1);
2164           dup2 (fd, 2);
2165         }
2166       execl ("/bin/rmdir", "rmdir", dpath, (char *) 0);
2167       _exit (-1);               /* Can't exec /bin/rmdir */
2168
2169     default:                    /* Parent process */
2170       wait_for_termination (cpid);
2171     }
2172
2173   if (synch_process_death != 0 || synch_process_retcode != 0
2174       || synch_process_termsig != 0)
2175     {
2176       errno = EIO;              /* We don't know why, but */
2177       return -1;                /* /bin/rmdir failed */
2178     }
2179
2180   return 0;
2181 }
2182 #endif /* !HAVE_RMDIR */
2183
2184 \f
2185 #ifndef HAVE_MEMSET
2186 void *
2187 memset (void *b, int n, size_t length)
2188 {
2189   unsigned char *p = b;
2190   while (length-- > 0)
2191     *p++ = n;
2192   return b;
2193 }
2194 #endif /* !HAVE_MEMSET */
2195
2196 #ifndef HAVE_MEMCPY
2197 void *
2198 memcpy (void *b1, void *b2, size_t length)
2199 {
2200   unsigned char *p1 = b1, *p2 = b2;
2201   while (length-- > 0)
2202     *p1++ = *p2++;
2203   return b1;
2204 }
2205 #endif /* !HAVE_MEMCPY */
2206
2207 #ifndef HAVE_MEMMOVE
2208 void *
2209 memmove (void *b1, void *b2, size_t length)
2210 {
2211   unsigned char *p1 = b1, *p2 = b2;
2212   if (p1 < p2 || p1 >= p2 + length)
2213     while (length-- > 0)
2214       *p1++ = *p2++;
2215   else
2216     {
2217       p1 += length;
2218       p2 += length;
2219       while (length-- > 0)
2220         *--p1 = *--p2;
2221     }
2222   return b1;
2223 }
2224 #endif /* !HAVE_MEMCPY */
2225
2226 #ifndef HAVE_MEMCMP
2227 int
2228 memcmp (void *b1, void *b2, size_t length)
2229 {
2230   unsigned char *p1 = b1, *p2 = b2;
2231   while (length-- > 0)
2232     if (*p1++ != *p2++)
2233       return p1[-1] < p2[-1] ? -1 : 1;
2234   return 0;
2235 }
2236 #endif /* !HAVE_MEMCMP */
2237 \f
2238 #ifndef HAVE_STRSIGNAL
2239 char *
2240 strsignal (int code)
2241 {
2242   char *signame = 0;
2243
2244   if (0 <= code && code < NSIG)
2245     {
2246       /* Cast to suppress warning if the table has const char *.  */
2247       signame = (char *) sys_siglist[code];
2248     }
2249
2250   return signame;
2251 }
2252 #endif /* HAVE_STRSIGNAL */
2253 \f
2254 #ifndef DOS_NT
2255 /* For make-serial-process  */
2256 int
2257 serial_open (char *port)
2258 {
2259   int fd = -1;
2260
2261   fd = emacs_open ((char*) port,
2262                    O_RDWR
2263 #ifdef O_NONBLOCK
2264                    | O_NONBLOCK
2265 #else
2266                    | O_NDELAY
2267 #endif
2268 #ifdef O_NOCTTY
2269                    | O_NOCTTY
2270 #endif
2271                    , 0);
2272   if (fd < 0)
2273     {
2274       error ("Could not open %s: %s",
2275              port, emacs_strerror (errno));
2276     }
2277 #ifdef TIOCEXCL
2278   ioctl (fd, TIOCEXCL, (char *) 0);
2279 #endif
2280
2281   return fd;
2282 }
2283
2284 #if !defined (HAVE_CFMAKERAW)
2285 /* Workaround for targets which are missing cfmakeraw.  */
2286 /* Pasted from man page.  */
2287 static void
2288 cfmakeraw (struct termios *termios_p)
2289 {
2290     termios_p->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
2291     termios_p->c_oflag &= ~OPOST;
2292     termios_p->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
2293     termios_p->c_cflag &= ~(CSIZE|PARENB);
2294     termios_p->c_cflag |= CS8;
2295 }
2296 #endif /* !defined (HAVE_CFMAKERAW */
2297
2298 #if !defined (HAVE_CFSETSPEED)
2299 /* Workaround for targets which are missing cfsetspeed.  */
2300 static int
2301 cfsetspeed (struct termios *termios_p, speed_t vitesse)
2302 {
2303   return (cfsetispeed (termios_p, vitesse)
2304           + cfsetospeed (termios_p, vitesse));
2305 }
2306 #endif
2307
2308 /* For serial-process-configure  */
2309 void
2310 serial_configure (struct Lisp_Process *p,
2311                   Lisp_Object contact)
2312 {
2313   Lisp_Object childp2 = Qnil;
2314   Lisp_Object tem = Qnil;
2315   struct termios attr;
2316   int err = -1;
2317   char summary[4] = "???"; /* This usually becomes "8N1".  */
2318
2319   childp2 = Fcopy_sequence (p->childp);
2320
2321   /* Read port attributes and prepare default configuration.  */
2322   err = tcgetattr (p->outfd, &attr);
2323   if (err != 0)
2324     error ("tcgetattr() failed: %s", emacs_strerror (errno));
2325   cfmakeraw (&attr);
2326 #if defined (CLOCAL)
2327   attr.c_cflag |= CLOCAL;
2328 #endif
2329 #if defined (CREAD)
2330   attr.c_cflag |= CREAD;
2331 #endif
2332
2333   /* Configure speed.  */
2334   if (!NILP (Fplist_member (contact, QCspeed)))
2335     tem = Fplist_get (contact, QCspeed);
2336   else
2337     tem = Fplist_get (p->childp, QCspeed);
2338   CHECK_NUMBER (tem);
2339   err = cfsetspeed (&attr, XINT (tem));
2340   if (err != 0)
2341     error ("cfsetspeed(%d) failed: %s", XINT (tem), emacs_strerror (errno));
2342   childp2 = Fplist_put (childp2, QCspeed, tem);
2343
2344   /* Configure bytesize.  */
2345   if (!NILP (Fplist_member (contact, QCbytesize)))
2346     tem = Fplist_get (contact, QCbytesize);
2347   else
2348     tem = Fplist_get (p->childp, QCbytesize);
2349   if (NILP (tem))
2350     tem = make_number (8);
2351   CHECK_NUMBER (tem);
2352   if (XINT (tem) != 7 && XINT (tem) != 8)
2353     error (":bytesize must be nil (8), 7, or 8");
2354   summary[0] = XINT (tem) + '0';
2355 #if defined (CSIZE) && defined (CS7) && defined (CS8)
2356   attr.c_cflag &= ~CSIZE;
2357   attr.c_cflag |= ((XINT (tem) == 7) ? CS7 : CS8);
2358 #else
2359   /* Don't error on bytesize 8, which should be set by cfmakeraw.  */
2360   if (XINT (tem) != 8)
2361     error ("Bytesize cannot be changed");
2362 #endif
2363   childp2 = Fplist_put (childp2, QCbytesize, tem);
2364
2365   /* Configure parity.  */
2366   if (!NILP (Fplist_member (contact, QCparity)))
2367     tem = Fplist_get (contact, QCparity);
2368   else
2369     tem = Fplist_get (p->childp, QCparity);
2370   if (!NILP (tem) && !EQ (tem, Qeven) && !EQ (tem, Qodd))
2371     error (":parity must be nil (no parity), `even', or `odd'");
2372 #if defined (PARENB) && defined (PARODD) && defined (IGNPAR) && defined (INPCK)
2373   attr.c_cflag &= ~(PARENB | PARODD);
2374   attr.c_iflag &= ~(IGNPAR | INPCK);
2375   if (NILP (tem))
2376     {
2377       summary[1] = 'N';
2378     }
2379   else if (EQ (tem, Qeven))
2380     {
2381       summary[1] = 'E';
2382       attr.c_cflag |= PARENB;
2383       attr.c_iflag |= (IGNPAR | INPCK);
2384     }
2385   else if (EQ (tem, Qodd))
2386     {
2387       summary[1] = 'O';
2388       attr.c_cflag |= (PARENB | PARODD);
2389       attr.c_iflag |= (IGNPAR | INPCK);
2390     }
2391 #else
2392   /* Don't error on no parity, which should be set by cfmakeraw.  */
2393   if (!NILP (tem))
2394     error ("Parity cannot be configured");
2395 #endif
2396   childp2 = Fplist_put (childp2, QCparity, tem);
2397
2398   /* Configure stopbits.  */
2399   if (!NILP (Fplist_member (contact, QCstopbits)))
2400     tem = Fplist_get (contact, QCstopbits);
2401   else
2402     tem = Fplist_get (p->childp, QCstopbits);
2403   if (NILP (tem))
2404     tem = make_number (1);
2405   CHECK_NUMBER (tem);
2406   if (XINT (tem) != 1 && XINT (tem) != 2)
2407     error (":stopbits must be nil (1 stopbit), 1, or 2");
2408   summary[2] = XINT (tem) + '0';
2409 #if defined (CSTOPB)
2410   attr.c_cflag &= ~CSTOPB;
2411   if (XINT (tem) == 2)
2412     attr.c_cflag |= CSTOPB;
2413 #else
2414   /* Don't error on 1 stopbit, which should be set by cfmakeraw.  */
2415   if (XINT (tem) != 1)
2416     error ("Stopbits cannot be configured");
2417 #endif
2418   childp2 = Fplist_put (childp2, QCstopbits, tem);
2419
2420   /* Configure flowcontrol.  */
2421   if (!NILP (Fplist_member (contact, QCflowcontrol)))
2422     tem = Fplist_get (contact, QCflowcontrol);
2423   else
2424     tem = Fplist_get (p->childp, QCflowcontrol);
2425   if (!NILP (tem) && !EQ (tem, Qhw) && !EQ (tem, Qsw))
2426     error (":flowcontrol must be nil (no flowcontrol), `hw', or `sw'");
2427 #if defined (CRTSCTS)
2428   attr.c_cflag &= ~CRTSCTS;
2429 #endif
2430 #if defined (CNEW_RTSCTS)
2431   attr.c_cflag &= ~CNEW_RTSCTS;
2432 #endif
2433 #if defined (IXON) && defined (IXOFF)
2434   attr.c_iflag &= ~(IXON | IXOFF);
2435 #endif
2436   if (NILP (tem))
2437     {
2438       /* Already configured.  */
2439     }
2440   else if (EQ (tem, Qhw))
2441     {
2442 #if defined (CRTSCTS)
2443       attr.c_cflag |= CRTSCTS;
2444 #elif defined (CNEW_RTSCTS)
2445       attr.c_cflag |= CNEW_RTSCTS;
2446 #else
2447       error ("Hardware flowcontrol (RTS/CTS) not supported");
2448 #endif
2449     }
2450   else if (EQ (tem, Qsw))
2451     {
2452 #if defined (IXON) && defined (IXOFF)
2453       attr.c_iflag |= (IXON | IXOFF);
2454 #else
2455       error ("Software flowcontrol (XON/XOFF) not supported");
2456 #endif
2457     }
2458   childp2 = Fplist_put (childp2, QCflowcontrol, tem);
2459
2460   /* Activate configuration.  */
2461   err = tcsetattr (p->outfd, TCSANOW, &attr);
2462   if (err != 0)
2463     error ("tcsetattr() failed: %s", emacs_strerror (errno));
2464
2465   childp2 = Fplist_put (childp2, QCsummary, build_string (summary));
2466   p->childp = childp2;
2467
2468 }
2469 #endif /* not DOS_NT  */
2470 \f
2471 /* System depended enumeration of and access to system processes a-la ps(1).  */
2472
2473 #ifdef HAVE_PROCFS
2474
2475 /* Process enumeration and access via /proc.  */
2476
2477 Lisp_Object
2478 list_system_processes (void)
2479 {
2480   Lisp_Object procdir, match, proclist, next;
2481   struct gcpro gcpro1, gcpro2;
2482   register Lisp_Object tail;
2483
2484   GCPRO2 (procdir, match);
2485   /* For every process on the system, there's a directory in the
2486      "/proc" pseudo-directory whose name is the numeric ID of that
2487      process.  */
2488   procdir = build_string ("/proc");
2489   match = build_string ("[0-9]+");
2490   proclist = directory_files_internal (procdir, Qnil, match, Qt, 0, Qnil);
2491
2492   /* `proclist' gives process IDs as strings.  Destructively convert
2493      each string into a number.  */
2494   for (tail = proclist; CONSP (tail); tail = next)
2495     {
2496       next = XCDR (tail);
2497       XSETCAR (tail, Fstring_to_number (XCAR (tail), Qnil));
2498     }
2499   UNGCPRO;
2500
2501   /* directory_files_internal returns the files in reverse order; undo
2502      that.  */
2503   proclist = Fnreverse (proclist);
2504   return proclist;
2505 }
2506
2507 /* The WINDOWSNT implementation is in w32.c.
2508    The MSDOS implementation is in dosfns.c.  */
2509 #elif !defined (WINDOWSNT) && !defined (MSDOS)
2510
2511 Lisp_Object
2512 list_system_processes (void)
2513 {
2514   return Qnil;
2515 }
2516
2517 #endif /* !defined (WINDOWSNT) */
2518
2519 #ifdef GNU_LINUX
2520 static void
2521 time_from_jiffies (unsigned long long tval, long hz,
2522                    time_t *sec, unsigned *usec)
2523 {
2524   unsigned long long ullsec;
2525
2526   *sec = tval / hz;
2527   ullsec = *sec;
2528   tval -= ullsec * hz;
2529   /* Careful: if HZ > 1 million, then integer division by it yields zero.  */
2530   if (hz <= 1000000)
2531     *usec = tval * 1000000 / hz;
2532   else
2533     *usec = tval / (hz / 1000000);
2534 }
2535
2536 static Lisp_Object
2537 ltime_from_jiffies (unsigned long long tval, long hz)
2538 {
2539   time_t sec;
2540   unsigned usec;
2541
2542   time_from_jiffies (tval, hz, &sec, &usec);
2543
2544   return list3 (make_number ((sec >> 16) & 0xffff),
2545                 make_number (sec & 0xffff),
2546                 make_number (usec));
2547 }
2548
2549 static void
2550 get_up_time (time_t *sec, unsigned *usec)
2551 {
2552   FILE *fup;
2553
2554   *sec = *usec = 0;
2555
2556   BLOCK_INPUT;
2557   fup = fopen ("/proc/uptime", "r");
2558
2559   if (fup)
2560     {
2561       double uptime, idletime;
2562
2563       /* The numbers in /proc/uptime use C-locale decimal point, but
2564          we already set ourselves to the C locale (see `fixup_locale'
2565          in emacs.c).  */
2566       if (2 <= fscanf (fup, "%lf %lf", &uptime, &idletime))
2567         {
2568           *sec = uptime;
2569           *usec = (uptime - *sec) * 1000000;
2570         }
2571       fclose (fup);
2572     }
2573   UNBLOCK_INPUT;
2574 }
2575
2576 #define MAJOR(d) (((unsigned)(d) >> 8) & 0xfff)
2577 #define MINOR(d) (((unsigned)(d) & 0xff) | (((unsigned)(d) & 0xfff00000) >> 12))
2578
2579 static Lisp_Object
2580 procfs_ttyname (int rdev)
2581 {
2582   FILE *fdev = NULL;
2583   char name[PATH_MAX];
2584
2585   BLOCK_INPUT;
2586   fdev = fopen ("/proc/tty/drivers", "r");
2587
2588   if (fdev)
2589     {
2590       unsigned major;
2591       unsigned long minor_beg, minor_end;
2592       char minor[25];   /* 2 32-bit numbers + dash */
2593       char *endp;
2594
2595       while (!feof (fdev) && !ferror (fdev))
2596         {
2597           if (3 <= fscanf (fdev, "%*s %s %u %s %*s\n", name, &major, minor)
2598               && major == MAJOR (rdev))
2599             {
2600               minor_beg = strtoul (minor, &endp, 0);
2601               if (*endp == '\0')
2602                 minor_end = minor_beg;
2603               else if (*endp == '-')
2604                 minor_end = strtoul (endp + 1, &endp, 0);
2605               else
2606                 continue;
2607
2608               if (MINOR (rdev) >= minor_beg && MINOR (rdev) <= minor_end)
2609                 {
2610                   sprintf (name + strlen (name), "%u", MINOR (rdev));
2611                   break;
2612                 }
2613             }
2614         }
2615       fclose (fdev);
2616     }
2617   UNBLOCK_INPUT;
2618   return build_string (name);
2619 }
2620
2621 static unsigned long
2622 procfs_get_total_memory (void)
2623 {
2624   FILE *fmem = NULL;
2625   unsigned long retval = 2 * 1024 * 1024; /* default: 2GB */
2626
2627   BLOCK_INPUT;
2628   fmem = fopen ("/proc/meminfo", "r");
2629
2630   if (fmem)
2631     {
2632       unsigned long entry_value;
2633       char entry_name[20];      /* the longest I saw is 13+1 */
2634
2635       while (!feof (fmem) && !ferror (fmem))
2636         {
2637           if (2 <= fscanf (fmem, "%s %lu kB\n", entry_name, &entry_value)
2638               && strcmp (entry_name, "MemTotal:") == 0)
2639             {
2640               retval = entry_value;
2641               break;
2642             }
2643         }
2644       fclose (fmem);
2645     }
2646   UNBLOCK_INPUT;
2647   return retval;
2648 }
2649
2650 Lisp_Object
2651 system_process_attributes (Lisp_Object pid)
2652 {
2653   char procfn[PATH_MAX], fn[PATH_MAX];
2654   struct stat st;
2655   struct passwd *pw;
2656   struct group *gr;
2657   long clocks_per_sec;
2658   char *procfn_end;
2659   char procbuf[1025], *p, *q;
2660   int fd;
2661   ssize_t nread;
2662   const char *cmd = NULL;
2663   char *cmdline = NULL;
2664   size_t cmdsize = 0, cmdline_size;
2665   unsigned char c;
2666   int proc_id, ppid, uid, gid, pgrp, sess, tty, tpgid, thcount;
2667   unsigned long long utime, stime, cutime, cstime, start;
2668   long priority, nice, rss;
2669   unsigned long minflt, majflt, cminflt, cmajflt, vsize;
2670   time_t sec;
2671   unsigned usec;
2672   EMACS_TIME tnow, tstart, tboot, telapsed;
2673   double pcpu, pmem;
2674   Lisp_Object attrs = Qnil;
2675   Lisp_Object cmd_str, decoded_cmd, tem;
2676   struct gcpro gcpro1, gcpro2;
2677   EMACS_INT uid_eint, gid_eint;
2678
2679   CHECK_NUMBER_OR_FLOAT (pid);
2680   proc_id = FLOATP (pid) ? XFLOAT_DATA (pid) : XINT (pid);
2681   sprintf (procfn, "/proc/%u", proc_id);
2682   if (stat (procfn, &st) < 0)
2683     return attrs;
2684
2685   GCPRO2 (attrs, decoded_cmd);
2686
2687   /* euid egid */
2688   uid = st.st_uid;
2689   /* Use of EMACS_INT stops GCC whining about limited range of data type.  */
2690   uid_eint = uid;
2691   attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (uid_eint)), attrs);
2692   BLOCK_INPUT;
2693   pw = getpwuid (uid);
2694   UNBLOCK_INPUT;
2695   if (pw)
2696     attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);
2697
2698   gid = st.st_gid;
2699   gid_eint = gid;
2700   attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (gid_eint)), attrs);
2701   BLOCK_INPUT;
2702   gr = getgrgid (gid);
2703   UNBLOCK_INPUT;
2704   if (gr)
2705     attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);
2706
2707   strcpy (fn, procfn);
2708   procfn_end = fn + strlen (fn);
2709   strcpy (procfn_end, "/stat");
2710   fd = emacs_open (fn, O_RDONLY, 0);
2711   if (fd >= 0 && (nread = emacs_read (fd, procbuf, sizeof (procbuf) - 1)) > 0)
2712     {
2713       procbuf[nread] = '\0';
2714       p = procbuf;
2715
2716       p = strchr (p, '(');
2717       if (p != NULL)
2718         {
2719           q = strrchr (p + 1, ')');
2720           /* comm */
2721           if (q != NULL)
2722             {
2723               cmd = p + 1;
2724               cmdsize = q - cmd;
2725             }
2726         }
2727       else
2728         q = NULL;
2729       if (cmd == NULL)
2730         {
2731           cmd = "???";
2732           cmdsize = 3;
2733         }
2734       /* Command name is encoded in locale-coding-system; decode it.  */
2735       cmd_str = make_unibyte_string (cmd, cmdsize);
2736       decoded_cmd = code_convert_string_norecord (cmd_str,
2737                                                   Vlocale_coding_system, 0);
2738       attrs = Fcons (Fcons (Qcomm, decoded_cmd), attrs);
2739
2740       if (q)
2741         {
2742           EMACS_INT ppid_eint, pgrp_eint, sess_eint, tpgid_eint, thcount_eint;
2743           p = q + 2;
2744           /* state ppid pgrp sess tty tpgid . minflt cminflt majflt cmajflt utime stime cutime cstime priority nice thcount . start vsize rss */
2745           sscanf (p, "%c %d %d %d %d %d %*u %lu %lu %lu %lu %Lu %Lu %Lu %Lu %ld %ld %d %*d %Lu %lu %ld",
2746                   &c, &ppid, &pgrp, &sess, &tty, &tpgid,
2747                   &minflt, &cminflt, &majflt, &cmajflt,
2748                   &utime, &stime, &cutime, &cstime,
2749                   &priority, &nice, &thcount, &start, &vsize, &rss);
2750           {
2751             char state_str[2];
2752
2753             state_str[0] = c;
2754             state_str[1] = '\0';
2755             tem =  build_string (state_str);
2756             attrs = Fcons (Fcons (Qstate, tem), attrs);
2757           }
2758           /* Stops GCC whining about limited range of data type.  */
2759           ppid_eint = ppid;
2760           pgrp_eint = pgrp;
2761           sess_eint = sess;
2762           tpgid_eint = tpgid;
2763           thcount_eint = thcount;
2764           attrs = Fcons (Fcons (Qppid, make_fixnum_or_float (ppid_eint)), attrs);
2765           attrs = Fcons (Fcons (Qpgrp, make_fixnum_or_float (pgrp_eint)), attrs);
2766           attrs = Fcons (Fcons (Qsess, make_fixnum_or_float (sess_eint)), attrs);
2767           attrs = Fcons (Fcons (Qttname, procfs_ttyname (tty)), attrs);
2768           attrs = Fcons (Fcons (Qtpgid, make_fixnum_or_float (tpgid_eint)), attrs);
2769           attrs = Fcons (Fcons (Qminflt, make_fixnum_or_float (minflt)), attrs);
2770           attrs = Fcons (Fcons (Qmajflt, make_fixnum_or_float (majflt)), attrs);
2771           attrs = Fcons (Fcons (Qcminflt, make_fixnum_or_float (cminflt)), attrs);
2772           attrs = Fcons (Fcons (Qcmajflt, make_fixnum_or_float (cmajflt)), attrs);
2773           clocks_per_sec = sysconf (_SC_CLK_TCK);
2774           if (clocks_per_sec < 0)
2775             clocks_per_sec = 100;
2776           attrs = Fcons (Fcons (Qutime,
2777                                 ltime_from_jiffies (utime, clocks_per_sec)),
2778                          attrs);
2779           attrs = Fcons (Fcons (Qstime,
2780                                 ltime_from_jiffies (stime, clocks_per_sec)),
2781                          attrs);
2782           attrs = Fcons (Fcons (Qtime,
2783                                 ltime_from_jiffies (stime+utime, clocks_per_sec)),
2784                          attrs);
2785           attrs = Fcons (Fcons (Qcutime,
2786                                 ltime_from_jiffies (cutime, clocks_per_sec)),
2787                          attrs);
2788           attrs = Fcons (Fcons (Qcstime,
2789                                 ltime_from_jiffies (cstime, clocks_per_sec)),
2790                          attrs);
2791           attrs = Fcons (Fcons (Qctime,
2792                                 ltime_from_jiffies (cstime+cutime, clocks_per_sec)),
2793                          attrs);
2794           attrs = Fcons (Fcons (Qpri, make_number (priority)), attrs);
2795           attrs = Fcons (Fcons (Qnice, make_number (nice)), attrs);
2796           attrs = Fcons (Fcons (Qthcount, make_fixnum_or_float (thcount_eint)), attrs);
2797           EMACS_GET_TIME (tnow);
2798           get_up_time (&sec, &usec);
2799           EMACS_SET_SECS (telapsed, sec);
2800           EMACS_SET_USECS (telapsed, usec);
2801           EMACS_SUB_TIME (tboot, tnow, telapsed);
2802           time_from_jiffies (start, clocks_per_sec, &sec, &usec);
2803           EMACS_SET_SECS (tstart, sec);
2804           EMACS_SET_USECS (tstart, usec);
2805           EMACS_ADD_TIME (tstart, tboot, tstart);
2806           attrs = Fcons (Fcons (Qstart,
2807                                 list3 (make_number
2808                                        ((EMACS_SECS (tstart) >> 16) & 0xffff),
2809                                        make_number
2810                                        (EMACS_SECS (tstart) & 0xffff),
2811                                        make_number
2812                                        (EMACS_USECS (tstart)))),
2813                          attrs);
2814           attrs = Fcons (Fcons (Qvsize, make_fixnum_or_float (vsize/1024)), attrs);
2815           attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (4*rss)), attrs);
2816           EMACS_SUB_TIME (telapsed, tnow, tstart);
2817           attrs = Fcons (Fcons (Qetime,
2818                                 list3 (make_number
2819                                        ((EMACS_SECS (telapsed) >> 16) & 0xffff),
2820                                        make_number
2821                                        (EMACS_SECS (telapsed) & 0xffff),
2822                                        make_number
2823                                        (EMACS_USECS (telapsed)))),
2824                          attrs);
2825           time_from_jiffies (utime + stime, clocks_per_sec, &sec, &usec);
2826           pcpu = (sec + usec / 1000000.0) / (EMACS_SECS (telapsed) + EMACS_USECS (telapsed) / 1000000.0);
2827           if (pcpu > 1.0)
2828             pcpu = 1.0;
2829           attrs = Fcons (Fcons (Qpcpu, make_float (100 * pcpu)), attrs);
2830           pmem = 4.0 * 100 * rss / procfs_get_total_memory ();
2831           if (pmem > 100)
2832             pmem = 100;
2833           attrs = Fcons (Fcons (Qpmem, make_float (pmem)), attrs);
2834         }
2835     }
2836   if (fd >= 0)
2837     emacs_close (fd);
2838
2839   /* args */
2840   strcpy (procfn_end, "/cmdline");
2841   fd = emacs_open (fn, O_RDONLY, 0);
2842   if (fd >= 0)
2843     {
2844       for (cmdline_size = 0; emacs_read (fd, &c, 1) == 1; cmdline_size++)
2845         {
2846           if (isspace (c) || c == '\\')
2847             cmdline_size++;     /* for later quoting, see below */
2848         }
2849       if (cmdline_size)
2850         {
2851           cmdline = xmalloc (cmdline_size + 1);
2852           lseek (fd, 0L, SEEK_SET);
2853           cmdline[0] = '\0';
2854           if ((nread = read (fd, cmdline, cmdline_size)) >= 0)
2855             cmdline[nread++] = '\0';
2856           else
2857             {
2858               /* Assigning zero to `nread' makes us skip the following
2859                  two loops, assign zero to cmdline_size, and enter the
2860                  following `if' clause that handles unknown command
2861                  lines.  */
2862               nread = 0;
2863             }
2864           /* We don't want trailing null characters.  */
2865           for (p = cmdline + nread - 1; p > cmdline && !*p; p--)
2866             nread--;
2867           for (p = cmdline; p < cmdline + nread; p++)
2868             {
2869               /* Escape-quote whitespace and backslashes.  */
2870               if (isspace (*p) || *p == '\\')
2871                 {
2872                   memmove (p + 1, p, nread - (p - cmdline));
2873                   nread++;
2874                   *p++ = '\\';
2875                 }
2876               else if (*p == '\0')
2877                 *p = ' ';
2878             }
2879           cmdline_size = nread;
2880         }
2881       if (!cmdline_size)
2882         {
2883           if (!cmd)
2884             cmd = "???";
2885           if (!cmdsize)
2886             cmdsize = strlen (cmd);
2887           cmdline_size = cmdsize + 2;
2888           cmdline = xmalloc (cmdline_size + 1);
2889           strcpy (cmdline, "[");
2890           strcat (strncat (cmdline, cmd, cmdsize), "]");
2891         }
2892       emacs_close (fd);
2893       /* Command line is encoded in locale-coding-system; decode it.  */
2894       cmd_str = make_unibyte_string (cmdline, cmdline_size);
2895       decoded_cmd = code_convert_string_norecord (cmd_str,
2896                                                   Vlocale_coding_system, 0);
2897       xfree (cmdline);
2898       attrs = Fcons (Fcons (Qargs, decoded_cmd), attrs);
2899     }
2900
2901   UNGCPRO;
2902   return attrs;
2903 }
2904
2905 #elif defined (SOLARIS2) && defined (HAVE_PROCFS)
2906
2907 /* The <procfs.h> header does not like to be included if _LP64 is defined and
2908    __FILE_OFFSET_BITS == 64.  This is an ugly workaround that.  */
2909 #if !defined (_LP64) && defined (_FILE_OFFSET_BITS) &&  (_FILE_OFFSET_BITS  ==  64)
2910 #define PROCFS_FILE_OFFSET_BITS_HACK 1
2911 #undef _FILE_OFFSET_BITS
2912 #else
2913 #define PROCFS_FILE_OFFSET_BITS_HACK 0
2914 #endif
2915
2916 #include <procfs.h>
2917
2918 #if PROCFS_FILE_OFFSET_BITS_HACK ==  1
2919 #define _FILE_OFFSET_BITS 64
2920 #endif /* PROCFS_FILE_OFFSET_BITS_HACK ==  1 */
2921
2922 Lisp_Object
2923 system_process_attributes (Lisp_Object pid)
2924 {
2925   char procfn[PATH_MAX], fn[PATH_MAX];
2926   struct stat st;
2927   struct passwd *pw;
2928   struct group *gr;
2929   char *procfn_end;
2930   struct psinfo pinfo;
2931   int fd;
2932   ssize_t nread;
2933   int proc_id, uid, gid;
2934   Lisp_Object attrs = Qnil;
2935   Lisp_Object decoded_cmd, tem;
2936   struct gcpro gcpro1, gcpro2;
2937   EMACS_INT uid_eint, gid_eint;
2938
2939   CHECK_NUMBER_OR_FLOAT (pid);
2940   proc_id = FLOATP (pid) ? XFLOAT_DATA (pid) : XINT (pid);
2941   sprintf (procfn, "/proc/%u", proc_id);
2942   if (stat (procfn, &st) < 0)
2943     return attrs;
2944
2945   GCPRO2 (attrs, decoded_cmd);
2946
2947   /* euid egid */
2948   uid = st.st_uid;
2949   /* Use of EMACS_INT stops GCC whining about limited range of data type.  */
2950   uid_eint = uid;
2951   attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (uid_eint)), attrs);
2952   BLOCK_INPUT;
2953   pw = getpwuid (uid);
2954   UNBLOCK_INPUT;
2955   if (pw)
2956     attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);
2957
2958   gid = st.st_gid;
2959   gid_eint = gid;
2960   attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (gid_eint)), attrs);
2961   BLOCK_INPUT;
2962   gr = getgrgid (gid);
2963   UNBLOCK_INPUT;
2964   if (gr)
2965     attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);
2966
2967   strcpy (fn, procfn);
2968   procfn_end = fn + strlen (fn);
2969   strcpy (procfn_end, "/psinfo");
2970   fd = emacs_open (fn, O_RDONLY, 0);
2971   if (fd >= 0
2972       && (nread = read (fd, (char*)&pinfo, sizeof (struct psinfo)) > 0))
2973     {
2974           attrs = Fcons (Fcons (Qppid, make_fixnum_or_float (pinfo.pr_ppid)), attrs);
2975           attrs = Fcons (Fcons (Qpgrp, make_fixnum_or_float (pinfo.pr_pgid)), attrs);
2976           attrs = Fcons (Fcons (Qsess, make_fixnum_or_float (pinfo.pr_sid)), attrs);
2977
2978           {
2979             char state_str[2];
2980             state_str[0] =  pinfo.pr_lwp.pr_sname;
2981             state_str[1] =  '\0';
2982             tem =   build_string (state_str);
2983             attrs =  Fcons (Fcons (Qstate,  tem),  attrs);
2984           }
2985
2986           /* FIXME: missing Qttyname. psinfo.pr_ttydev is a dev_t,
2987              need to get a string from it. */
2988
2989           /* FIXME: missing: Qtpgid */
2990
2991           /* FIXME: missing:
2992                 Qminflt
2993                 Qmajflt
2994                 Qcminflt
2995                 Qcmajflt
2996
2997                 Qutime
2998                 Qcutime
2999                 Qstime
3000                 Qcstime
3001                 Are they available? */
3002
3003           attrs = Fcons (Fcons (Qtime,
3004                                 list3 (make_number (pinfo.pr_time.tv_sec >> 16),
3005                                        make_number (pinfo.pr_time.tv_sec & 0xffff),
3006                                        make_number (pinfo.pr_time.tv_nsec))),
3007                          attrs);
3008
3009           attrs = Fcons (Fcons (Qctime,
3010                                 list3 (make_number (pinfo.pr_ctime.tv_sec >> 16),
3011                                        make_number (pinfo.pr_ctime.tv_sec & 0xffff),
3012                                        make_number (pinfo.pr_ctime.tv_nsec))),
3013                          attrs);
3014
3015           attrs = Fcons (Fcons (Qpri, make_number (pinfo.pr_lwp.pr_pri)), attrs);
3016           attrs = Fcons (Fcons (Qnice, make_number (pinfo.pr_lwp.pr_nice)), attrs);
3017           attrs = Fcons (Fcons (Qthcount, make_fixnum_or_float (pinfo.pr_nlwp)), attrs);
3018
3019           attrs = Fcons (Fcons (Qstart,
3020                                 list3 (make_number (pinfo.pr_start.tv_sec >> 16),
3021                                        make_number (pinfo.pr_start.tv_sec & 0xffff),
3022                                        make_number (pinfo.pr_start.tv_nsec))),
3023                          attrs);
3024           attrs = Fcons (Fcons (Qvsize, make_fixnum_or_float (pinfo.pr_size)), attrs);
3025           attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (pinfo.pr_rssize)), attrs);
3026
3027           /* pr_pctcpu and pr_pctmem are encoded as a fixed point 16 bit number in  [0 ... 1].  */
3028           attrs = Fcons (Fcons (Qpcpu, (pinfo.pr_pctcpu * 100.0) / (double)0x8000), attrs);
3029           attrs = Fcons (Fcons (Qpmem, (pinfo.pr_pctmem * 100.0) / (double)0x8000), attrs);
3030
3031           decoded_cmd
3032             =  code_convert_string_norecord (make_unibyte_string (pinfo.pr_fname,
3033                                                                   strlen (pinfo.pr_fname)),
3034                                              Vlocale_coding_system,  0);
3035           attrs =  Fcons (Fcons (Qcomm,  decoded_cmd),  attrs);
3036           decoded_cmd
3037             =  code_convert_string_norecord (make_unibyte_string (pinfo.pr_psargs,
3038                                                                   strlen (pinfo.pr_psargs)),
3039                                              Vlocale_coding_system,  0);
3040           attrs =  Fcons (Fcons (Qargs,  decoded_cmd),  attrs);
3041     }
3042
3043   if (fd >= 0)
3044     emacs_close (fd);
3045
3046   UNGCPRO;
3047   return attrs;
3048 }
3049
3050 /* The WINDOWSNT implementation is in w32.c.
3051    The MSDOS implementation is in dosfns.c.  */
3052 #elif !defined (WINDOWSNT) && !defined (MSDOS)
3053
3054 Lisp_Object
3055 system_process_attributes (Lisp_Object pid)
3056 {
3057   return Qnil;
3058 }
3059
3060 #endif  /* !defined (WINDOWSNT) */
3061