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/* Test of posix_spawn() function: writing to a subprocess.
Copyright (C) 2008-2023 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 <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2008. */
#include <config.h>
#include <spawn.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#define CHILD_PROGRAM_FILENAME "test-posix_spawn-dup2-stdin.sh"
static int
fd_safer (int fd)
{
if (0 <= fd && fd <= 2)
{
int f = fd_safer (dup (fd));
int e = errno;
close (fd);
errno = e;
fd = f;
}
return fd;
}
int
main ()
{
char *argv[3] = { (char *) BOURNE_SHELL, (char *) CHILD_PROGRAM_FILENAME, NULL };
int ofd[2];
sigset_t blocked_signals;
sigset_t fatal_signal_set;
posix_spawn_file_actions_t actions;
bool actions_allocated;
posix_spawnattr_t attrs;
bool attrs_allocated;
int err;
pid_t child;
int fd;
FILE *fp;
int written;
int status;
int exitstatus;
if (pipe (ofd) < 0 || (ofd[1] = fd_safer (ofd[1])) < 0)
{
perror ("cannot create pipe");
exit (1);
}
sigprocmask (SIG_SETMASK, NULL, &blocked_signals);
sigemptyset (&fatal_signal_set);
sigaddset (&fatal_signal_set, SIGINT);
sigaddset (&fatal_signal_set, SIGTERM);
#ifdef SIGHUP
sigaddset (&fatal_signal_set, SIGHUP);
#endif
#ifdef SIGPIPE
sigaddset (&fatal_signal_set, SIGPIPE);
#endif
sigprocmask (SIG_BLOCK, &fatal_signal_set, NULL);
actions_allocated = false;
attrs_allocated = false;
if ((err = posix_spawn_file_actions_init (&actions)) != 0
|| (actions_allocated = true,
(err = posix_spawn_file_actions_adddup2 (&actions, ofd[0], STDIN_FILENO)) != 0
|| (err = posix_spawn_file_actions_addclose (&actions, ofd[0])) != 0
|| (err = posix_spawn_file_actions_addclose (&actions, ofd[1])) != 0
|| (err = posix_spawnattr_init (&attrs)) != 0
|| (attrs_allocated = true,
#if defined _WIN32 && !defined __CYGWIN__
0
#else
(err = posix_spawnattr_setsigmask (&attrs, &blocked_signals)) != 0
|| (err = posix_spawnattr_setflags (&attrs, POSIX_SPAWN_SETSIGMASK)) != 0
#endif
)
|| (err = posix_spawnp (&child, BOURNE_SHELL, &actions, &attrs, argv, environ)) != 0))
{
if (actions_allocated)
posix_spawn_file_actions_destroy (&actions);
if (attrs_allocated)
posix_spawnattr_destroy (&attrs);
sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
errno = err;
perror ("subprocess failed");
exit (1);
}
posix_spawn_file_actions_destroy (&actions);
posix_spawnattr_destroy (&attrs);
sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL);
close (ofd[0]);
fd = ofd[1];
fp = fdopen (fd, "w");
if (fp == NULL)
{
fprintf (stderr, "fdopen() failed\n");
exit (1);
}
written = fwrite ("Halle Potta\n", 1, 12, fp);
if (written < 12)
{
fprintf (stderr, "could not write input\n");
exit (1);
}
fclose (fp);
status = 0;
while (waitpid (child, &status, 0) != child)
;
if (!WIFEXITED (status))
{
fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status);
exit (1);
}
exitstatus = WEXITSTATUS (status);
if (exitstatus != 0)
{
fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus);
exit (1);
}
return 0;
}
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