-/* Subprocesses with pipes.
-
- Copyright (C) 2002, 2004-2006, 2009-2010 Free Software Foundation,
- Inc.
-
- 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 3 of the License, 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, see <http://www.gnu.org/licenses/>. */
-
-/* Written by Paul Eggert <eggert@twinsun.com>
- and Florian Krohm <florian@edamail.fishkill.ibm.com>. */
-
-#include <config.h>
-
-#include "subpipe.h"
-
-#include <errno.h>
-
-#include <signal.h>
-#if ! defined SIGCHLD && defined SIGCLD
-# define SIGCHLD SIGCLD
-#endif
-
-#include <stdlib.h>
-
-#include <unistd.h>
-#ifndef STDIN_FILENO
-# define STDIN_FILENO 0
-#endif
-#ifndef STDOUT_FILENO
-# define STDOUT_FILENO 1
-#endif
-#if ! HAVE_DUP2 && ! defined dup2
-# include <fcntl.h>
-# define dup2(f, t) (close (t), fcntl (f, F_DUPFD, t))
-#endif
-
-#if HAVE_SYS_WAIT_H
-# include <sys/wait.h>
-#endif
-#ifndef WEXITSTATUS
-# define WEXITSTATUS(stat_val) ((unsigned int) (stat_val) >> 8)
-#endif
-#ifndef WIFEXITED
-# define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
-#endif
-
-#if HAVE_VFORK_H
-# include <vfork.h>
-#endif
-#if ! HAVE_WORKING_VFORK
-# define vfork fork
-#endif
-
-#include "error.h"
-#include "unistd-safer.h"
-
-#include "gettext.h"
-#define _(Msgid) gettext (Msgid)
-
-#ifndef __attribute__
-/* This feature is available in gcc versions 2.5 and later. */
-# if ! defined __GNUC__ || __GNUC__ < 2 || \
-(__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
-# define __attribute__(Spec) /* empty */
-# endif
-#endif
-
-#ifndef ATTRIBUTE_UNUSED
-# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
-#endif
-
-
-/* Initialize this module. */
-
-void
-init_subpipe (void)
-{
-#ifdef SIGCHLD
- /* System V fork+wait does not work if SIGCHLD is ignored. */
- signal (SIGCHLD, SIG_DFL);
-#endif
-}
-
-
-/* Create a subprocess that is run as a filter. ARGV is the
- NULL-terminated argument vector for the subprocess. Store read and
- write file descriptors for communication with the subprocess into
- FD[0] and FD[1]: input meant for the process can be written into
- FD[0], and output from the process can be read from FD[1]. Return
- the subprocess id.
-
- To avoid deadlock, the invoker must not let incoming data pile up
- in FD[1] while writing data to FD[0]. */
-
-pid_t
-create_subpipe (char const * const *argv, int fd[2])
-{
- int pipe_fd[2];
- int child_fd[2];
- pid_t pid;
-
- if (pipe_safer (child_fd) != 0 || pipe_safer (pipe_fd) != 0)
- error (EXIT_FAILURE, errno, "pipe");
- fd[0] = child_fd[1];
- fd[1] = pipe_fd[0];
- child_fd[1] = pipe_fd[1];
-
- pid = vfork ();
- if (pid < 0)
- error (EXIT_FAILURE, errno, "fork");
-
- if (! pid)
- {
- /* Child. */
- close (fd[0]);
- close (fd[1]);
- dup2 (child_fd[0], STDIN_FILENO);
- close (child_fd[0]);
- dup2 (child_fd[1], STDOUT_FILENO);
- close (child_fd[1]);
-
- /* The cast to (char **) rather than (char * const *) is needed
- for portability to older hosts with a nonstandard prototype
- for execvp. */
- execvp (argv[0], (char **) argv);
-
- _exit (errno == ENOENT ? 127 : 126);
- }
-
- /* Parent. */
- close (child_fd[0]);
- close (child_fd[1]);
- return pid;
-}
-
-
-/* Wait for the subprocess to exit. */
-
-void
-reap_subpipe (pid_t pid, char const *program)
-{
-#if HAVE_WAITPID || defined waitpid
- int wstatus;
- if (waitpid (pid, &wstatus, 0) < 0)
- error (EXIT_FAILURE, errno, "waitpid");
- else
- {
- int status = WIFEXITED (wstatus) ? WEXITSTATUS (wstatus) : -1;
- if (status)
- error (EXIT_FAILURE, 0,
- _(status == 126
- ? "subsidiary program `%s' could not be invoked"
- : status == 127
- ? "subsidiary program `%s' not found"
- : status < 0
- ? "subsidiary program `%s' failed"
- : "subsidiary program `%s' failed (exit status %d)"),
- program, status);
- }
-#endif
-}
-
-void
-end_of_output_subpipe (pid_t pid ATTRIBUTE_UNUSED,
- int fd[2] ATTRIBUTE_UNUSED)
-{
-}
projects / bison.git / commitdiff
