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/* Waiting for a subprocess to finish.
Copyright (C) 2001-2002 Free Software Foundation, Inc.
Written by Bruno Haible <haible@clisp.cons.org>, 2001.
This program 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 2, or (at your option)
any later version.
This program 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 this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
/* Specification. */
#include "wait-process.h"
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
/* On Linux, WEXITSTATUS are bits 15..8 and WTERMSIG are bits 7..0, while
BeOS uses the contrary. Therefore we use the abstract macros. */
#if HAVE_UNION_WAIT
# define WAIT_T union wait
# ifndef WTERMSIG
# define WTERMSIG(x) ((x).w_termsig)
# endif
# ifndef WCOREDUMP
# define WCOREDUMP(x) ((x).w_coredump)
# endif
# ifndef WEXITSTATUS
# define WEXITSTATUS(x) ((x).w_retcode)
# endif
#else
# define WAIT_T int
# ifndef WTERMSIG
# define WTERMSIG(x) ((x) & 0x7f)
# endif
# ifndef WCOREDUMP
# define WCOREDUMP(x) ((x) & 0x80)
# endif
# ifndef WEXITSTATUS
# define WEXITSTATUS(x) (((x) >> 8) & 0xff)
# endif
#endif
/* For valid x, exactly one of WIFSIGNALED(x), WIFEXITED(x), WIFSTOPPED(x)
is true. */
#ifndef WIFSIGNALED
# define WIFSIGNALED(x) (WTERMSIG (x) != 0 && WTERMSIG(x) != 0x7f)
#endif
#ifndef WIFEXITED
# define WIFEXITED(x) (WTERMSIG (x) == 0)
#endif
#ifndef WIFSTOPPED
# define WIFSTOPPED(x) (WTERMSIG (x) == 0x7f)
#endif
/* Note that portable applications may access
WTERMSIG(x) only if WIFSIGNALED(x) is true, and
WEXITSTATUS(x) only if WIFEXITED(x) is true. */
#include "error.h"
#include "exit.h"
#include "gettext.h"
#define _(str) gettext (str)
int
wait_subprocess (pid_t child, const char *progname, bool exit_on_error)
{
/* waitpid() is just as portable as wait() nowadays. */
WAIT_T status;
*(int *) &status = 0;
for (;;)
{
int result = waitpid (child, &status, 0);
if (result != child)
{
#ifdef EINTR
if (errno == EINTR)
continue;
#endif
#if 0 /* defined ECHILD */
if (errno == ECHILD)
{
/* Child process nonexistent?! Assume it terminated
successfully. */
*(int *) &status = 0;
break;
}
#endif
if (exit_on_error)
error (EXIT_FAILURE, errno, _("%s subprocess"), progname);
else
return 127;
}
/* One of WIFSIGNALED (status), WIFEXITED (status), WIFSTOPPED (status)
must always be true. Loop until the program terminates. */
if (!WIFSTOPPED (status))
break;
}
if (WIFSIGNALED (status))
{
if (exit_on_error)
error (EXIT_FAILURE, 0, _("%s subprocess got fatal signal %d"),
progname, (int) WTERMSIG (status));
else
return 127;
}
if (WEXITSTATUS (status) == 127)
{
if (exit_on_error)
error (EXIT_FAILURE, 0, _("%s subprocess failed"), progname);
else
return 127;
}
return WEXITSTATUS (status);
}
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