nojobs.c

   1 /* The thing that makes children, remembers them, and contains wait loops. */
   2
   3 /* This file works under BSD, System V, minix, and Posix systems.  It does
   4    not implement job control. */
   5
   6 /* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
   7
   8    This file is part of GNU Bash, the Bourne Again SHell.
   9
  10    Bash is free software; you can redistribute it and/or modify it under
  11    the terms of the GNU General Public License as published by the Free
  12    Software Foundation; either version 2, or (at your option) any later
  13    version.
  14
  15    Bash is distributed in the hope that it will be useful, but WITHOUT ANY
  16    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  18    for more details.
  19
  20    You should have received a copy of the GNU General Public License along
  21    with Bash; see the file COPYING.  If not, write to the Free Software
  22    Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
  23
  24 #include "config.h"
  25
  26 #include "bashtypes.h"
  27 #include "filecntl.h"
  28
  29 #if defined (HAVE_UNISTD_H)
  30 #  include <unistd.h>
  31 #endif
  32
  33 #include <stdio.h>
  34 #include <signal.h>
  35 #include <errno.h>
  36
  37 #if defined (BUFFERED_INPUT)
  38 #  include "input.h"
  39 #endif
  40
  41 /* Need to include this up here for *_TTY_DRIVER definitions. */
  42 #include "shtty.h"
  43
  44 #if !defined (STRUCT_WINSIZE_IN_SYS_IOCTL)
  45 /* For struct winsize on SCO */
  46 /*   sys/ptem.h has winsize but needs mblk_t from sys/stream.h */
  47 #  if defined (HAVE_SYS_PTEM_H) && defined (TIOCGWINSZ) && defined (SIGWINCH)
  48 #    if defined (HAVE_SYS_STREAM_H)
  49 #      include <sys/stream.h>
  50 #    endif
  51 #    include <sys/ptem.h>
  52 #  endif /* HAVE_SYS_PTEM_H && TIOCGWINSZ && SIGWINCH */
  53 #endif /* !STRUCT_WINSIZE_IN_SYS_IOCTL */
  54
  55 #include "shell.h"
  56 #include "jobs.h"
  57
  58 #include "builtins/builtext.h"  /* for wait_builtin */
  59
  60 #if !defined (CHILD_MAX)
  61 #  define CHILD_MAX 32
  62 #endif
  63
  64 #if defined (_POSIX_VERSION) || !defined (HAVE_KILLPG)
  65 #  define killpg(pg, sig)               kill(-(pg),(sig))
  66 #endif /* USG || _POSIX_VERSION */
  67
  68 #if !defined (HAVE_SIGINTERRUPT)
  69 #  define siginterrupt(sig, code)
  70 #endif /* !HAVE_SIGINTERRUPT */
  71
  72 #if defined (HAVE_WAITPID)
  73 #  define WAITPID(pid, statusp, options) waitpid (pid, statusp, options)
  74 #else
  75 #  define WAITPID(pid, statusp, options) wait (statusp)
  76 #endif /* !HAVE_WAITPID */
  77
  78 /* Return the fd from which we are actually getting input. */
  79 #define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr)
  80
  81 #if !defined (errno)
  82 extern int errno;
  83 #endif /* !errno */
  84
  85 #if defined (READLINE)
  86 extern void rl_set_screen_size __P((int, int));
  87 #endif
  88
  89 extern int interactive, interactive_shell, login_shell;
  90 extern int subshell_environment;
  91 extern int last_command_exit_value;
  92 extern int interrupt_immediately;
  93 extern sh_builtin_func_t *this_shell_builtin;
  94 #if defined (HAVE_POSIX_SIGNALS)
  95 extern sigset_t top_level_mask;
  96 #endif
  97 extern procenv_t wait_intr_buf;
  98
  99 pid_t last_made_pid = NO_PID;
 100 pid_t last_asynchronous_pid = NO_PID;
 101
 102 /* Call this when you start making children. */
 103 int already_making_children = 0;
 104
 105 /* The controlling tty for this shell. */
 106 int shell_tty = -1;
 107
 108 /* If this is non-zero, $LINES and $COLUMNS are reset after every process
 109    exits from get_tty_state(). */
 110 int check_window_size;
 111
 112 /* STATUS and FLAGS are only valid if pid != NO_PID
 113    STATUS is only valid if (flags & PROC_RUNNING) == 0 */
 114 struct proc_status {
 115   pid_t pid;
 116   int status;   /* Exit status of PID or 128 + fatal signal number */
 117   int flags;
 118 };
 119
 120 /* Values for proc_status.flags */
 121 #define PROC_RUNNING    0x01
 122 #define PROC_NOTIFIED   0x02
 123 #define PROC_ASYNC      0x04
 124
 125 /* Return values from find_status_by_pid */
 126 #define PROC_BAD         -1
 127 #define PROC_STILL_ALIVE -2
 128
 129 static struct proc_status *pid_list = (struct proc_status *)NULL;
 130 static int pid_list_size;
 131 static int wait_sigint_received;
 132
 133 static void alloc_pid_list __P((void));
 134 static int find_proc_slot __P((void));
 135 static int find_index_by_pid __P((pid_t));
 136 static int find_status_by_pid __P((pid_t));
 137 static int process_exit_status __P((WAIT));
 138 static void set_pid_status __P((pid_t, WAIT));
 139 static void set_pid_flags __P((pid_t, int));
 140 static void unset_pid_flags __P((pid_t, int));
 141 static void add_pid __P((pid_t, int));
 142 static void mark_dead_jobs_as_notified __P((int));
 143
 144 static void get_new_window_size __P((int));
 145 static sighandler sigwinch_sighandler __P((int));
 146 static sighandler wait_signal_handler __P((int));
 147
 148 #if defined (HAVE_WAITPID)
 149 static void reap_zombie_children __P((void));
 150 #endif
 151
 152 static void restore_sigint_handler __P((void));
 153
 154 /* Allocate new, or grow existing PID_LIST. */
 155 static void
 156 alloc_pid_list ()
 157 {
 158   register int i;
 159   int old = pid_list_size;
 160
 161   pid_list_size += 10;
 162   pid_list = (struct proc_status *)xrealloc (pid_list, pid_list_size * sizeof (struct proc_status));
 163
 164   /* None of the newly allocated slots have process id's yet. */
 165   for (i = old; i < pid_list_size; i++)
 166     pid_list[i].pid = NO_PID;
 167 }
 168
 169 /* Return the offset within the PID_LIST array of an empty slot.  This can
 170    create new slots if all of the existing slots are taken. */
 171 static int
 172 find_proc_slot ()
 173 {
 174   register int i;
 175
 176   for (i = 0; i < pid_list_size; i++)
 177     if (pid_list[i].pid == NO_PID)
 178       return (i);
 179
 180   if (i == pid_list_size)
 181     alloc_pid_list ();
 182
 183   return (i);
 184 }
 185
 186 /* Return the offset within the PID_LIST array of a slot containing PID,
 187    or the value NO_PID if the pid wasn't found. */
 188 static int
 189 find_index_by_pid (pid)
 190      pid_t pid;
 191 {
 192   register int i;
 193
 194   for (i = 0; i < pid_list_size; i++)
 195     if (pid_list[i].pid == pid)
 196       return (i);
 197
 198   return (NO_PID);
 199 }
 200
 201 /* Return the status of PID as looked up in the PID_LIST array.  A
 202    return value of PROC_BAD indicates that PID wasn't found. */
 203 static int
 204 find_status_by_pid (pid)
 205      pid_t pid;
 206 {
 207   int i;
 208
 209   i = find_index_by_pid (pid);
 210   if (i == NO_PID)
 211     return (PROC_BAD);
 212   if (pid_list[i].flags & PROC_RUNNING)
 213     return (PROC_STILL_ALIVE);
 214   return (pid_list[i].status);
 215 }
 216
 217 static int
 218 process_exit_status (status)
 219      WAIT status;
 220 {
 221   if (WIFSIGNALED (status))
 222     return (128 + WTERMSIG (status));
 223   else
 224     return (WEXITSTATUS (status));
 225 }
 226
 227 /* Give PID the status value STATUS in the PID_LIST array. */
 228 static void
 229 set_pid_status (pid, status)
 230      pid_t pid;
 231      WAIT status;
 232 {
 233   int slot;
 234
 235   slot = find_index_by_pid (pid);
 236   if (slot == NO_PID)
 237     return;
 238
 239   pid_list[slot].status = process_exit_status (status);
 240   pid_list[slot].flags &= ~PROC_RUNNING;
 241   /* If it's not a background process, mark it as notified so it gets
 242      cleaned up. */
 243   if ((pid_list[slot].flags & PROC_ASYNC) == 0)
 244     pid_list[slot].flags |= PROC_NOTIFIED;
 245 }
 246
 247 /* Give PID the flags FLAGS in the PID_LIST array. */
 248 static void
 249 set_pid_flags (pid, flags)
 250      pid_t pid;
 251      int flags;
 252 {
 253   int slot;
 254
 255   slot = find_index_by_pid (pid);
 256   if (slot == NO_PID)
 257     return;
 258
 259   pid_list[slot].flags |= flags;
 260 }
 261
 262 /* Unset FLAGS for PID in the pid list */
 263 static void
 264 unset_pid_flags (pid, flags)
 265      pid_t pid;
 266      int flags;
 267 {
 268   int slot;
 269
 270   slot = find_index_by_pid (pid);
 271   if (slot == NO_PID)
 272     return;
 273
 274   pid_list[slot].flags &= ~flags;
 275 }
 276
 277 static void
 278 add_pid (pid, async)
 279      pid_t pid;
 280      int async;
 281 {
 282   int slot;
 283
 284   slot = find_proc_slot ();
 285
 286   pid_list[slot].pid = pid;
 287   pid_list[slot].status = -1;
 288   pid_list[slot].flags = PROC_RUNNING;
 289   if (async)
 290     pid_list[slot].flags |= PROC_ASYNC;
 291 }
 292
 293 static void
 294 mark_dead_jobs_as_notified (force)
 295      int force;
 296 {
 297   register int i, ndead;
 298
 299   /* first, count the number of non-running async jobs if FORCE == 0 */
 300   for (i = ndead = 0; force == 0 && i < pid_list_size; i++)
 301     {
 302       if (pid_list[i].pid == NO_PID)
 303         continue;
 304       if (((pid_list[i].flags & PROC_RUNNING) == 0) &&
 305            (pid_list[i].flags & PROC_ASYNC))
 306         ndead++;
 307     }
 308
 309   if (force == 0 && ndead <= CHILD_MAX)
 310     return;
 311
 312   /* If FORCE == 0, we just mark as many non-running async jobs as notified
 313      to bring us under the CHILD_MAX limit. */
 314   for (i = 0; i < pid_list_size; i++)
 315     {
 316       if (pid_list[i].pid == NO_PID)
 317         continue;
 318       if (((pid_list[i].flags & PROC_RUNNING) == 0) &&
 319            pid_list[i].pid != last_asynchronous_pid)
 320         {
 321           pid_list[i].flags |= PROC_NOTIFIED;
 322           if (force == 0 && (pid_list[i].flags & PROC_ASYNC) && --ndead <= CHILD_MAX)
 323             break;
 324         }
 325     }
 326 }
 327
 328 /* Remove all dead, notified jobs from the pid_list. */
 329 int
 330 cleanup_dead_jobs ()
 331 {
 332   register int i;
 333
 334 #if defined (HAVE_WAITPID)
 335   reap_zombie_children ();
 336 #endif
 337
 338   for (i = 0; i < pid_list_size; i++)
 339     {
 340       if ((pid_list[i].flags & PROC_RUNNING) == 0 &&
 341           (pid_list[i].flags & PROC_NOTIFIED))
 342         pid_list[i].pid = NO_PID;
 343     }
 344
 345   return 0;
 346 }
 347
 348 void
 349 reap_dead_jobs ()
 350 {
 351   mark_dead_jobs_as_notified (0);
 352   cleanup_dead_jobs ();
 353 }
 354
 355 /* Initialize the job control mechanism, and set up the tty stuff. */
 356 initialize_job_control (force)
 357      int force;
 358 {
 359   shell_tty = fileno (stderr);
 360
 361   if (interactive)
 362     get_tty_state ();
 363 }
 364
 365 #if defined (TIOCGWINSZ) && defined (SIGWINCH)
 366 static SigHandler *old_winch = (SigHandler *)SIG_DFL;
 367
 368 static void
 369 get_new_window_size (from_sig)
 370      int from_sig;
 371 {
 372   struct winsize win;
 373   int tty;
 374
 375   tty = input_tty ();
 376   if (tty >= 0 && (ioctl (tty, TIOCGWINSZ, &win) == 0) &&
 377       win.ws_row > 0 && win.ws_col > 0)
 378     {
 379 #if defined (aixpc)
 380       shell_tty_info.c_winsize = win;   /* structure copying */
 381 #endif
 382       sh_set_lines_and_columns (win.ws_row, win.ws_col);
 383 #if defined (READLINE)
 384       rl_set_screen_size (win.ws_row, win.ws_col);
 385 #endif
 386     }
 387 }
 388
 389 static sighandler
 390 sigwinch_sighandler (sig)
 391      int sig;
 392 {
 393 #if defined (MUST_REINSTALL_SIGHANDLERS)
 394   set_signal_handler (SIGWINCH, sigwinch_sighandler);
 395 #endif /* MUST_REINSTALL_SIGHANDLERS */
 396   get_new_window_size (1);
 397 }
 398 #else
 399 static void
 400 get_new_window_size (from_sig)
 401      int from_sig;
 402 {
 403 }
 404 #endif /* TIOCGWINSZ && SIGWINCH */
 405
 406 void
 407 set_sigwinch_handler ()
 408 {
 409 #if defined (TIOCGWINSZ) && defined (SIGWINCH)
 410   old_winch = set_signal_handler (SIGWINCH, sigwinch_sighandler);
 411 #endif
 412 }
 413
 414 void
 415 unset_sigwinch_handler ()
 416 {
 417 #if defined (TIOCGWINSZ) && defined (SIGWINCH)
 418   set_signal_handler (SIGWINCH, old_winch);
 419 #endif
 420 }
 421
 422 /* Setup this shell to handle C-C, etc. */
 423 void
 424 initialize_job_signals ()
 425 {
 426   set_signal_handler (SIGINT, sigint_sighandler);
 427   set_sigwinch_handler ();
 428
 429   /* If this is a login shell we don't wish to be disturbed by
 430      stop signals. */
 431   if (login_shell)
 432     ignore_tty_job_signals ();
 433 }
 434
 435 #if defined (HAVE_WAITPID)
 436 /* Collect the status of all zombie children so that their system
 437    resources can be deallocated. */
 438 static void
 439 reap_zombie_children ()
 440 {
 441 #if defined (WNOHANG)
 442   pid_t pid;
 443   WAIT status;
 444
 445   while ((pid = waitpid (-1, (int *)&status, WNOHANG)) > 0)
 446     set_pid_status (pid, status);
 447 #endif
 448 }
 449 #endif /* WAITPID && WNOHANG */
 450
 451 /* Fork, handling errors.  Returns the pid of the newly made child, or 0.
 452    COMMAND is just for remembering the name of the command; we don't do
 453    anything else with it.  ASYNC_P says what to do with the tty.  If
 454    non-zero, then don't give it away. */
 455 pid_t
 456 make_child (command, async_p)
 457      char *command;
 458      int async_p;
 459 {
 460   pid_t pid;
 461 #if defined (HAVE_WAITPID)
 462   int retry = 1;
 463 #endif /* HAVE_WAITPID */
 464
 465   /* Discard saved memory. */
 466   if (command)
 467     free (command);
 468
 469   start_pipeline ();
 470
 471 #if defined (BUFFERED_INPUT)
 472   /* If default_buffered_input is active, we are reading a script.  If
 473      the command is asynchronous, we have already duplicated /dev/null
 474      as fd 0, but have not changed the buffered stream corresponding to
 475      the old fd 0.  We don't want to sync the stream in this case. */
 476   if (default_buffered_input != -1 && (!async_p || default_buffered_input > 0))
 477     sync_buffered_stream (default_buffered_input);
 478 #endif /* BUFFERED_INPUT */
 479
 480   /* Create the child, handle severe errors. */
 481 #if defined (HAVE_WAITPID)
 482   retry_fork:
 483 #endif /* HAVE_WAITPID */
 484
 485   if ((pid = fork ()) < 0)
 486     {
 487 #if defined (HAVE_WAITPID)
 488       /* Posix systems with a non-blocking waitpid () system call available
 489          get another chance after zombies are reaped. */
 490       if (errno == EAGAIN && retry)
 491         {
 492           reap_zombie_children ();
 493           retry = 0;
 494           goto retry_fork;
 495         }
 496 #endif /* HAVE_WAITPID */
 497
 498       sys_error ("fork");
 499
 500       throw_to_top_level ();
 501     }
 502
 503   if (pid == 0)
 504     {
 505 #if defined (BUFFERED_INPUT)
 506       unset_bash_input (0);
 507 #endif /* BUFFERED_INPUT */
 508
 509 #if defined (HAVE_POSIX_SIGNALS)
 510       /* Restore top-level signal mask. */
 511       sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL);
 512 #endif
 513
 514       /* Ignore INT and QUIT in asynchronous children. */
 515       if (async_p)
 516         last_asynchronous_pid = getpid ();
 517
 518       default_tty_job_signals ();
 519     }
 520   else
 521     {
 522       /* In the parent. */
 523
 524       last_made_pid = pid;
 525
 526       if (async_p)
 527         last_asynchronous_pid = pid;
 528
 529       add_pid (pid, async_p);
 530     }
 531   return (pid);
 532 }
 533
 534 void
 535 ignore_tty_job_signals ()
 536 {
 537 #if defined (SIGTSTP)
 538   set_signal_handler (SIGTSTP, SIG_IGN);
 539   set_signal_handler (SIGTTIN, SIG_IGN);
 540   set_signal_handler (SIGTTOU, SIG_IGN);
 541 #endif
 542 }
 543
 544 void
 545 default_tty_job_signals ()
 546 {
 547 #if defined (SIGTSTP)
 548   set_signal_handler (SIGTSTP, SIG_DFL);
 549   set_signal_handler (SIGTTIN, SIG_DFL);
 550   set_signal_handler (SIGTTOU, SIG_DFL);
 551 #endif
 552 }
 553
 554 /* Wait for a single pid (PID) and return its exit status.  Called by
 555    the wait builtin. */
 556 int
 557 wait_for_single_pid (pid)
 558      pid_t pid;
 559 {
 560   pid_t got_pid;
 561   WAIT status;
 562   int pstatus;
 563
 564   pstatus = find_status_by_pid (pid);
 565
 566   if (pstatus == PROC_BAD)
 567     {
 568       internal_error ("wait: pid %ld is not a child of this shell", (long)pid);
 569       return (127);
 570     }
 571
 572   if (pstatus != PROC_STILL_ALIVE)
 573     return (pstatus);
 574
 575   siginterrupt (SIGINT, 1);
 576   while ((got_pid = WAITPID (pid, &status, 0)) != pid)
 577     {
 578       if (got_pid < 0)
 579         {
 580           if (errno != EINTR && errno != ECHILD)
 581             {
 582               siginterrupt (SIGINT, 0);
 583               sys_error ("wait");
 584             }
 585           break;
 586         }
 587       else if (got_pid > 0)
 588         set_pid_status (got_pid, status);
 589     }
 590
 591   set_pid_status (got_pid, status);
 592   set_pid_flags (got_pid, PROC_NOTIFIED);
 593
 594   siginterrupt (SIGINT, 0);
 595   QUIT;
 596
 597   return (process_exit_status (status));
 598 }
 599
 600 /* Wait for all of the shell's children to exit.  Called by the `wait'
 601    builtin. */
 602 void
 603 wait_for_background_pids ()
 604 {
 605   pid_t got_pid;
 606   WAIT status;
 607
 608   /* If we aren't using job control, we let the kernel take care of the
 609      bookkeeping for us.  wait () will return -1 and set errno to ECHILD
 610      when there are no more unwaited-for child processes on both
 611      4.2 BSD-based and System V-based systems. */
 612
 613   siginterrupt (SIGINT, 1);
 614
 615   /* Wait for ECHILD */
 616   while ((got_pid = WAITPID (-1, &status, 0)) != -1)
 617     set_pid_status (got_pid, status);
 618
 619   if (errno != EINTR && errno != ECHILD)
 620     {
 621       siginterrupt (SIGINT, 0);
 622       sys_error("wait");
 623     }
 624
 625   siginterrupt (SIGINT, 0);
 626   QUIT;
 627
 628   mark_dead_jobs_as_notified (1);
 629   cleanup_dead_jobs ();
 630 }
 631
 632 /* Make OLD_SIGINT_HANDLER the SIGINT signal handler. */
 633 #define INVALID_SIGNAL_HANDLER (SigHandler *)wait_for_background_pids
 634 static SigHandler *old_sigint_handler = INVALID_SIGNAL_HANDLER;
 635
 636 static void
 637 restore_sigint_handler ()
 638 {
 639   if (old_sigint_handler != INVALID_SIGNAL_HANDLER)
 640     {
 641       set_signal_handler (SIGINT, old_sigint_handler);
 642       old_sigint_handler = INVALID_SIGNAL_HANDLER;
 643     }
 644 }
 645
 646 /* Handle SIGINT while we are waiting for children in a script to exit.
 647    All interrupts are effectively ignored by the shell, but allowed to
 648    kill a running job. */
 649 static sighandler
 650 wait_sigint_handler (sig)
 651      int sig;
 652 {
 653   SigHandler *sigint_handler;
 654
 655   /* If we got a SIGINT while in `wait', and SIGINT is trapped, do
 656      what POSIX.2 says (see builtins/wait.def for more info). */
 657   if (this_shell_builtin && this_shell_builtin == wait_builtin &&
 658       signal_is_trapped (SIGINT) &&
 659       ((sigint_handler = trap_to_sighandler (SIGINT)) == trap_handler))
 660     {
 661       last_command_exit_value = EXECUTION_FAILURE;
 662       restore_sigint_handler ();
 663       interrupt_immediately = 0;
 664       trap_handler (SIGINT);    /* set pending_traps[SIGINT] */
 665       longjmp (wait_intr_buf, 1);
 666     }
 667
 668   if (interrupt_immediately)
 669     {
 670       last_command_exit_value = EXECUTION_FAILURE;
 671       restore_sigint_handler ();
 672       ADDINTERRUPT;
 673       QUIT;
 674     }
 675
 676   wait_sigint_received = 1;
 677
 678   SIGRETURN (0);
 679 }
 680
 681 /* Wait for pid (one of our children) to terminate.  This is called only
 682    by the execution code in execute_cmd.c. */
 683 int
 684 wait_for (pid)
 685      pid_t pid;
 686 {
 687   int return_val, pstatus;
 688   pid_t got_pid;
 689   WAIT status;
 690
 691   pstatus = find_status_by_pid (pid);
 692
 693   if (pstatus == PROC_BAD)
 694     return (0);
 695
 696   if (pstatus != PROC_STILL_ALIVE)
 697     return (pstatus);
 698
 699   /* If we are running a script, ignore SIGINT while we're waiting for
 700      a child to exit.  The loop below does some of this, but not all. */
 701   wait_sigint_received = 0;
 702   if (interactive_shell == 0)
 703     old_sigint_handler = set_signal_handler (SIGINT, wait_sigint_handler);
 704
 705   while ((got_pid = WAITPID (-1, &status, 0)) != pid) /* XXX was pid now -1 */
 706     {
 707       if (got_pid < 0 && errno == ECHILD)
 708         {
 709 #if !defined (_POSIX_VERSION)
 710           status.w_termsig = status.w_retcode = 0;
 711 #else
 712           status = 0;
 713 #endif /* _POSIX_VERSION */
 714           break;
 715         }
 716       else if (got_pid < 0 && errno != EINTR)
 717         programming_error ("wait_for(%ld): %s", (long)pid, strerror(errno));
 718       else if (got_pid > 0)
 719         set_pid_status (got_pid, status);
 720     }
 721
 722   set_pid_status (got_pid, status);
 723
 724 #if defined (HAVE_WAITPID)
 725   if (got_pid >= 0)
 726     reap_zombie_children ();
 727 #endif /* HAVE_WAITPID */
 728
 729   if (interactive_shell == 0)
 730     {
 731       SigHandler *temp_handler;
 732
 733       temp_handler = old_sigint_handler;
 734       restore_sigint_handler ();
 735
 736       /* If the job exited because of SIGINT, make sure the shell acts as if
 737          it had received one also. */
 738       if (WIFSIGNALED (status) && (WTERMSIG (status) == SIGINT))
 739         {
 740
 741           if (maybe_call_trap_handler (SIGINT) == 0)
 742             {
 743               if (temp_handler == SIG_DFL)
 744                 termination_unwind_protect (SIGINT);
 745               else if (temp_handler != INVALID_SIGNAL_HANDLER && temp_handler != SIG_IGN)
 746                 (*temp_handler) (SIGINT);
 747             }
 748         }
 749     }
 750
 751   /* Default return value. */
 752   /* ``a full 8 bits of status is returned'' */
 753   return_val = process_exit_status (status);
 754
 755 #if !defined (DONT_REPORT_SIGPIPE)
 756   if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) &&
 757         (WTERMSIG (status) != SIGINT))
 758 #else
 759   if ((WIFSTOPPED (status) == 0) && WIFSIGNALED (status) &&
 760         (WTERMSIG (status) != SIGINT) && (WTERMSIG (status) != SIGPIPE))
 761 #endif
 762     {
 763       fprintf (stderr, "%s", strsignal (WTERMSIG (status)));
 764       if (WIFCORED (status))
 765         fprintf (stderr, " (core dumped)");
 766       fprintf (stderr, "\n");
 767     }
 768
 769   if (interactive_shell && subshell_environment == 0)
 770     {
 771       if (WIFSIGNALED (status) || WIFSTOPPED (status))
 772         set_tty_state ();
 773       else
 774         get_tty_state ();
 775     }
 776
 777   return (return_val);
 778 }
 779
 780 /* Give PID SIGNAL.  This determines what job the pid belongs to (if any).
 781    If PID does belong to a job, and the job is stopped, then CONTinue the
 782    job after giving it SIGNAL.  Returns -1 on failure.  If GROUP is non-null,
 783    then kill the process group associated with PID. */
 784 int
 785 kill_pid (pid, signal, group)
 786      pid_t pid;
 787      int signal, group;
 788 {
 789   int result;
 790
 791   result = group ? killpg (pid, signal) : kill (pid, signal);
 792   return (result);
 793 }
 794
 795 static TTYSTRUCT shell_tty_info;
 796 static int got_tty_state;
 797
 798 /* Fill the contents of shell_tty_info with the current tty info. */
 799 get_tty_state ()
 800 {
 801   int tty;
 802
 803   tty = input_tty ();
 804   if (tty != -1)
 805     {
 806       ttgetattr (tty, &shell_tty_info);
 807       got_tty_state = 1;
 808       if (check_window_size)
 809         get_new_window_size (0);
 810     }
 811 }
 812
 813 /* Make the current tty use the state in shell_tty_info. */
 814 int
 815 set_tty_state ()
 816 {
 817   int tty;
 818
 819   tty = input_tty ();
 820   if (tty != -1)
 821     {
 822       if (got_tty_state == 0)
 823         return 0;
 824       ttsetattr (tty, &shell_tty_info);
 825     }
 826   return 0;
 827 }
 828
 829 /* Give the terminal to PGRP.  */
 830 give_terminal_to (pgrp, force)
 831      pid_t pgrp;
 832      int force;
 833 {
 834 }
 835
 836 /* Stop a pipeline. */
 837 int
 838 stop_pipeline (async, ignore)
 839      int async;
 840      COMMAND *ignore;
 841 {
 842   already_making_children = 0;
 843   return 0;
 844 }
 845
 846 void
 847 start_pipeline ()
 848 {
 849   already_making_children = 1;
 850 }
 851
 852 void
 853 stop_making_children ()
 854 {
 855   already_making_children = 0;
 856 }
 857
 858 int
 859 get_job_by_pid (pid, block)
 860      pid_t pid;
 861      int block;
 862 {
 863   int i;
 864
 865   i = find_index_by_pid (pid);
 866   return ((i == NO_PID) ? PROC_BAD : i);
 867 }
 868
 869 /* Print descriptive information about the job with leader pid PID. */
 870 void
 871 describe_pid (pid)
 872      pid_t pid;
 873 {
 874   fprintf (stderr, "%ld\n", (long) pid);
 875 }
 876
 877 void
 878 unfreeze_jobs_list ()
 879 {
 880 }
 881
 882 int
 883 count_all_jobs ()
 884 {
 885   return 0;
 886 }