307 lines
6.5 KiB
C
307 lines
6.5 KiB
C
/* The thing that makes children, remembers them, and contains wait loops. */
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/* this will probably only work with System V */
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/* Copyright (C) 1987,1989 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 1, or (at your option) any later
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version.
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Bash is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with Bash; see the file COPYING. If not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include <sys/types.h>
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/*#include <sys/ttold.h>*/
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#include <fcntl.h>
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#include <termio.h>
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#include <signal.h>
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#include <setjmp.h>
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#include <errno.h>
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#include "config.h"
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#include "general.h"
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#include "jobs.h"
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#ifndef SIGABRT
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#define SIGABRT SIGIOT
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#endif
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#ifdef MINIX
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#define TCGETA TIOCGETP
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#define TCSETAW TIOCSETP
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#endif
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#if defined(SYSV) || defined(MINIX)
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#define killpg(pg, sig) kill(-(pg),(sig))
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#endif /* SYSV */
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#if defined(SYSV) || defined(HPUX)
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int siginterrupt (sig, flag) int sig, flag; { return 0; }
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#endif
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int last_made_pid = -1;
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int last_asynchronous_pid = -1;
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/*
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* Initialize the job control mechanism, and set up the tty stuff.
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*/
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initialize_jobs ()
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{
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}
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/*
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* Setup this shell to handle C-C, etc.
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*/
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initialize_job_signals ()
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{
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extern int login_shell;
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extern sighandler throw_to_top_level ();
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signal (SIGINT, throw_to_top_level);
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signal (SIGQUIT, SIG_IGN);
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/* If this is a login shell we don't wish to be disturbed by
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stop signals. */
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if (login_shell)
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{
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#ifdef SIGSTOP
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signal (SIGSTOP, SIG_IGN);
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#endif
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#ifdef SIGTSTP
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signal (SIGTSTP, SIG_IGN);
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signal (SIGTTOU, SIG_IGN);
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signal (SIGTTIN, SIG_IGN);
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#endif
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}
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}
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/*
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* Fork, handling errors. Returns the pid of the newly made child, or 0.
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* COMMAND is just for remembering the name of the command; we don't do
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* anything else with it. ASYNC_P says what to do with the tty. If
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* non-zero, then don't give it away.
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*/
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int
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make_child (command, async_p)
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char *command;
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int async_p;
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{
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int pid;
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/* Discard saved memory. */
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if (command)
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free (command);
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/* Make new environment array if neccessary. */
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maybe_make_export_env ();
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/* Create the child, handle severe errors. */
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if ((pid = fork ()) < 0)
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{
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report_error ("Memory exhausted or process overflow!");
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throw_to_top_level ();
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}
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if (!pid)
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{
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/*
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* Ignore INT and QUIT in asynchronous children.
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*/
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if (async_p)
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{
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signal (SIGINT, SIG_IGN);
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signal (SIGQUIT, SIG_IGN);
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last_asynchronous_pid = getpid ();
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}
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else
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{
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signal (SIGINT, SIG_DFL);
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signal (SIGQUIT, SIG_DFL);
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}
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/* Children are easily terminated with SIGTERM. */
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signal (SIGTERM, SIG_DFL);
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/* Set the resource limits for this child. (In ulimit.c). */
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set_process_resource_limits ();
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}
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else
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{
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/*
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* In the parent.
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*/
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last_made_pid = pid;
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if (async_p)
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last_asynchronous_pid = pid;
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}
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return (pid);
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}
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/* Wait for a single pid (PID) and return its exit status. */
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wait_for_single_pid (pid)
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int pid;
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{
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int got_pid;
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union wait status;
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while ((got_pid = wait (&status)) != pid)
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{
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if (got_pid < 0)
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{
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if (errno != EINTR && errno != ECHILD)
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file_error ("wait");
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break;
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}
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}
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QUIT;
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}
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/* Wait for all of the shell's children to exit. */
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wait_for_background_pids ()
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{
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/* If we aren't using job control, we let the kernel take care of the
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bookkeeping for us. wait () will return -1 and set errno to ECHILD
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when there are no more unwaited-for child processes on both 4.2BSD-based
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and System V-based systems. */
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while (1)
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{
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int got_pid;
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union wait status;
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while ((got_pid = wait(&status)) != -1) /* wait for ECHILD */
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;
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if (errno != EINTR && errno != ECHILD)
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file_error("wait");
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break;
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}
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QUIT;
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}
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/*
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* Wait for pid (one of our children) to terminate.
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*/
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int
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wait_for (pid)
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int pid;
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{
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extern int interactive;
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int got_pid, return_val, oldmask;
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union wait status;
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while ((got_pid = wait (&status)) != pid)
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{
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if (got_pid < 0 && errno == ECHILD)
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{
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status.w_termsig = status.w_retcode = 0;
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break;
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}
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else if (got_pid < 0 && errno != EINTR)
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programming_error ("got errno %d while waiting for %d", errno, pid);
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}
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if (interactive) /* allow the user to ^C out of the builtin wait */
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QUIT;
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/* Default return value. */
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return_val = status.w_retcode & 0x7f;
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if (status.w_termsig != 0 && status.w_termsig != WSTOPPED)
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{
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extern char *sys_siglist[];
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fprintf (stderr, "%s", sys_siglist[status.w_termsig]);
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if (status.w_coredump)
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fprintf (stderr, " (core dumped)");
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fprintf (stderr, "\n");
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return_val = status.w_termsig + 128;
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}
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if (status.w_termsig != 0)
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set_tty_state ();
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else
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get_tty_state ();
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return (return_val);
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}
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/* Give PID SIGNAL. This determines what job the pid belongs to (if any).
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If PID does belong to a job, and the job is stopped, then CONTinue the
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job after giving it SIGNAL. Returns -1 on failure. If GROUP is non-null,
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then kill the process group associated with PID. */
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int
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kill_pid (pid, signal, group)
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int pid, signal, group;
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{
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int result;
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if (group)
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result = killpg (pid, signal);
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else
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result = kill (pid, signal);
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return (result);
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}
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static struct termio shell_tty_info;
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/* Fill the contents of shell_tty_info with the current tty info. */
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get_tty_state ()
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{
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int tty = open ("/dev/tty", O_RDONLY);
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if (tty != -1)
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{
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ioctl (tty, TCGETA, &shell_tty_info);
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close (tty);
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}
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}
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/* Make the current tty use the state in shell_tty_info. */
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set_tty_state ()
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{
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int tty = open ("/dev/tty", O_RDONLY);
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if (tty != -1)
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{
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ioctl (tty, TCSETAW, &shell_tty_info); /* Wait for output, no flush */
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close (tty);
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}
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}
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/* Give the terminal to PGRP. */
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give_terminal_to (pgrp)
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int pgrp;
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{
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}
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/*
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* stop a pipeline
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*/
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stop_pipeline (async, ignore)
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int async;
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char *ignore;
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{
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}
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/*
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* Print descriptive information about the job with leader pid PID.
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*/
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describe_pid (pid)
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int pid;
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{
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fprintf (stderr, "<%d>\n", pid);
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}
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