add directory bin
This commit is contained in:
gohigh
356
bin/old/bash-1.11/nojobs.c
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356
bin/old/bash-1.11/nojobs.c
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/* The thing that makes children, remembers them, and contains wait loops. */
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/* This file works under BSD, System V, minix, and Posix systems. */
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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 <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 "filecntl.h"
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#include "jobs.h"
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#if !defined (USG) && !defined (_POSIX_VERSION)
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# include <sgtty.h>
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#else
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# if defined (_POSIX_VERSION)
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# include <termios.h>
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# else
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# include <termio.h>
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# include <sys/ttold.h>
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# endif /* !POSIX_VERSION */
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#endif /* USG && _POSIX_VERSION */
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#ifndef SIGABRT
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#define SIGABRT SIGIOT
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#endif
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#if defined (USG) || defined (_POSIX_VERSION)
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#define killpg(pg, sig) kill(-(pg),(sig))
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#endif
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#if defined (USG)
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#define siginterrupt(sig, code)
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#endif
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pid_t last_made_pid = (pid_t)-1;
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pid_t last_asynchronous_pid = (pid_t)-1;
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extern int errno;
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/* Initialize the job control mechanism, and set up the tty stuff. */
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initialize_jobs ()
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{
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get_tty_state ();
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}
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/* Setup this shell to handle C-C, etc. */
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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 sigint_sighandler ();
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signal (SIGINT, sigint_sighandler);
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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 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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/* 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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pid_t
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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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pid_t 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 ("fork: %s", strerror (errno));
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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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/* Cancel shell traps. */
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restore_original_signals ();
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/* Ignore INT and QUIT in asynchronous children. */
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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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#if defined (SIGTSTP)
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signal (SIGTSTP, SIG_DFL);
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signal (SIGTTIN, SIG_DFL);
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signal (SIGTTOU, SIG_DFL);
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#endif
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}
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}
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else
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{
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/* In the parent. */
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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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pid_t pid;
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{
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pid_t got_pid;
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WAIT status;
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/* Make sure that the process we are waiting for is valid. */
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if ((kill (pid, 0) < 0) && errno == ESRCH)
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return (127);
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siginterrupt (SIGINT, 1);
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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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{
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siginterrupt (SIGINT, 0);
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file_error ("wait");
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}
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break;
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}
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}
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siginterrupt (SIGINT, 0);
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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
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4.2 BSD-based and System V-based systems. */
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siginterrupt (SIGINT, 1);
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while (1)
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{
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pid_t got_pid;
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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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{
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siginterrupt (SIGINT, 0);
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file_error("wait");
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}
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break;
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}
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siginterrupt (SIGINT, 0);
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QUIT;
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}
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/* Wait for pid (one of our children) to terminate. */
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int
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wait_for (pid)
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pid_t pid;
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{
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extern int interactive;
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int return_val;
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pid_t got_pid;
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WAIT status;
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/* Make sure that the process we are waiting for is valid. */
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if ((kill (pid, 0) < 0) && (errno == ESRCH))
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return (0);
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siginterrupt (SIGINT, 1);
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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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#if !defined (_POSIX_VERSION)
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status.w_termsig = status.w_retcode = 0;
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#else
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status = 0;
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#endif /* _POSIX_VERSION */
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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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siginterrupt (SIGINT, 0);
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#if 0
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/* Not needed because the builtin wait does not go through this path. */
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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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#endif
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/* Default return value. */
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/* ``a full 8 bits of status is returned'' */
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if (WIFSIGNALED (status))
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return_val = 128 + WTERMSIG (status);
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else
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return_val = WEXITSTATUS (status);
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if (!WIFSTOPPED (status) && WIFSIGNALED (status) &&
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(WTERMSIG (status) != SIGINT))
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{
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extern char *sys_siglist[];
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fprintf (stderr, "%s", sys_siglist[WTERMSIG (status)]);
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if (WIFCORED (status))
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fprintf (stderr, " (core dumped)");
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fprintf (stderr, "\n");
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}
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if (WIFSIGNALED (status) || WIFSTOPPED (status))
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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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pid_t pid;
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int 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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#if defined (_POSIX_VERSION)
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static struct termios shell_tty_info;
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#else
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# if defined (USG)
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static struct termio shell_tty_info;
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# else
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static struct sgttyb shell_tty_info;
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# endif /* USG */
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#endif /* _POSIX_VERSION */
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static int got_tty_state = 0;
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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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#if defined (_POSIX_VERSION)
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tcgetattr (tty, &shell_tty_info);
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#else
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# if defined (USG)
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ioctl (tty, TCGETA, &shell_tty_info);
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# else
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ioctl (tty, TIOCGETP, &shell_tty_info);
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# endif
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#endif
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close (tty);
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got_tty_state = 1;
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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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if (!got_tty_state)
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{
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close (tty);
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return;
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}
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#if defined (_POSIX_VERSION)
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tcsetattr (tty, TCSADRAIN, &shell_tty_info);
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#else
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# if defined (USG)
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ioctl (tty, TCSETAW, &shell_tty_info); /* Wait for output, no flush */
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# else
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ioctl (tty, TIOCSETN, &shell_tty_info);
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# endif
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#endif
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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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pid_t pgrp;
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{
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}
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/* Stop a pipeline. */
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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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/* Print descriptive information about the job with leader pid PID. */
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describe_pid (pid)
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pid_t pid;
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{
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fprintf (stderr, "<%d>\n", (int) pid);
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}
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