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    Length: 5494 (0x1576)
    Types: TextFile
    Names: »nojobs.c«

└─⟦a05ed705a⟧ Bits:30007078 DKUUG GNU 2/12/89
    └─⟦ca1f037a2⟧ »./bash-1.04.tar.Z« 
        └─⟦46465a4db⟧ 
            └─⟦this⟧ »bash-1.04/nojobs.c« 

TextFile

/* The thing that makes children, remembers them, and contains wait loops. */
/* this will probably only work with System V */

/* Copyright (C) 1987,1989 Free Software Foundation, Inc.

This file is part of GNU Bash, the Bourne Again SHell.

Bash is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 1, or (at your option) any later
version.

Bash is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with Bash; see the file COPYING.  If not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */

#include <stdio.h>
#include <sys/types.h>
#include <sys/ttold.h>
#include <fcntl.h>
#include <termio.h>
#include <signal.h>
#include <setjmp.h>
#include <errno.h>

#include "config.h"
#include "general.h"
#include "jobs.h"

#ifndef SIGABRT
#define SIGABRT SIGIOT
#endif

#ifndef SYSV
#include <sys/time.h>
#include <sys/resource.h>
/* The total amount of system time spent running processes for me. */
struct timeval total_systime = {0, 0};
long system_minutes_used = 0;
int system_seconds_used = 0;

/* The total amount of user time spent running processes for me. */
struct timeval total_usertime = {0, 0};
long user_minutes_used = 0;
int user_seconds_used = 0;
#endif

int last_made_pid;
int last_asynchronous_pid;

/*
 * Initialize the job control mechanism, and set up the tty stuff.
 */
initialize_jobs ()
{
}

/*
 * Setup this shell to handle C-C, etc.
 */
initialize_job_signals ()
{
  extern int login_shell;
  int throw_to_top_level ();

  signal (SIGINT, throw_to_top_level);
  signal (SIGQUIT, SIG_IGN);

  /* If this is a login shell we don't wish to be disturbed by
     stop signals. */
  if (login_shell)
    {
#ifdef SIGSTOP
      signal (SIGSTOP, SIG_IGN);
#endif
#ifdef SIGTSTP
      signal (SIGTSTP, SIG_IGN);
      signal (SIGTTOU, SIG_IGN);
      signal (SIGTTIN, SIG_IGN);
#endif
    }
}

/*
 * Fork, handling errors.  Returns the pid of the newly made child, or 0.
 * COMMAND is just for remembering the name of the command; we don't do
 * anything else with it.  ASYNC_P says what to do with the tty.  If
 * non-zero, then don't give it away.
 */
make_child (command, async_p)
     char *command;
     int async_p;
{
  int pid;

  /* Discard saved memory. */
  free (command);

  /* Make new environment array if neccessary. */
  maybe_make_export_env ();

  /* Create the child, handle severe errors. */
  if ((pid = fork ()) < 0)
    {
      report_error ("Memory exhausted or process overflow!");
      throw_to_top_level ();
    }

  if (!pid)
    {
      /*
       * Ignore INT and QUIT in asynchronous children.
       */
      if (async_p)
	{
	  signal (SIGINT, SIG_IGN);
	  signal (SIGQUIT, SIG_IGN);
	  last_asynchronous_pid = getpid ();
	}
      else
	{
	  signal (SIGINT, SIG_DFL);
	  signal (SIGQUIT, SIG_DFL);
	}
      /* Set the resource limits for this child. (In ulimit.c). */
      set_process_resource_limits ();
    }
  else
    {
      /*
       * In the parent.
       */
      last_made_pid = pid;

      if (async_p)
	last_asynchronous_pid = pid;
    }
  return (pid);
}

/*
 * Wait for pid (one of our children) to terminate.
 */
wait_for (pid)
     int pid;
{
  int got_pid, return_val, oldmask;
  union wait status;
#ifndef SYSV
  SigHandler *old_int, *old_quit;
#endif

#ifdef SYSV
  oldmask = sigignore (SIGINT);
#else
  oldmask = sigblock (sigmask (SIGINT));
#endif

  while ((got_pid = wait (&status)) != pid)
    {
      if (got_pid < 0 && errno == ECHILD)
	{
	  status.w_termsig = status.w_retcode = 0;
	  break;
	}
      else if (got_pid < 0 && errno != EINTR)
	programming_error ("got errno %d while waiting for %d", errno, pid);
    }


#ifdef SYSV
  sigrelse (oldmask);
#else
  sigsetmask (oldmask);
#endif

  /* Default return value. */
  return_val = status.w_retcode & 0x7f;

  if (status.w_termsig != 0 && status.w_termsig != WSTOPPED)
    {
      extern char *sys_siglist[];
      fprintf (stderr, "%s", sys_siglist[status.w_termsig]);
      if (status.w_coredump)
	fprintf (stderr, " (core dumped)");
      fprintf (stderr, "\n");
      return_val = status.w_termsig + 128;
      get_tty_state ();
    }
  return (return_val);
}

/* When we end a job abnormally, or if we stop a job, we set the tty to the
   state kept in here.  When a job ends normally, we set the state in here
   to the state of the tty. */
static struct sgttyb shell_tty_info;

/* Fill the contents of shell_tty_info with the current tty info. */
get_tty_state ()
{
  int tty = open ("/dev/tty", O_RDONLY);
  if (tty != -1)
    {
#ifdef TIOCGETP
      ioctl (tty, TIOCGETP, &shell_tty_info);
#endif
      close (tty);
    }
}

/* Make the current tty use the state in shell_tty_info. */
set_tty_state ()
{
  int tty = open ("/dev/tty", O_RDONLY);
  if (tty != -1)
    {
#ifdef TIOCSETN
      ioctl (tty, TIOCSETN, &shell_tty_info);
#endif
      close (tty);
    }
}

/*
 * stop a pipeline
 */
stop_pipeline (async, ignore)
     int async;
     char *ignore;
{
}

/*
 * Print descriptive information about the job with leader pid PID.
 */

describe_pid (pid)
     int pid;
{
  fprintf (stderr, "<%d>\n", pid);
}

wait_for_background_pids ()
{}

wait_for_single_pid ()
{}