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/* Create subprocess.
Copyright (C) 2019-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <signal.h>
#include <time.h>
#include <sys/wait.h>
#include <stdbool.h>
#include <support/xspawn.h>
#include <support/check.h>
#include <support/xunistd.h>
#include <support/subprocess.h>
#include <support/temp_file-internal.h>
static struct support_subprocess
support_subprocess_init (void)
{
struct support_subprocess result;
xpipe (result.stdout_pipe);
TEST_VERIFY (result.stdout_pipe[0] > STDERR_FILENO);
TEST_VERIFY (result.stdout_pipe[1] > STDERR_FILENO);
xpipe (result.stderr_pipe);
TEST_VERIFY (result.stderr_pipe[0] > STDERR_FILENO);
TEST_VERIFY (result.stderr_pipe[1] > STDERR_FILENO);
TEST_VERIFY (fflush (stdout) == 0);
TEST_VERIFY (fflush (stderr) == 0);
return result;
}
struct support_subprocess
support_subprocess (void (*callback) (void *), void *closure)
{
struct support_subprocess result = support_subprocess_init ();
result.pid = xfork ();
if (result.pid == 0)
{
xclose (result.stdout_pipe[0]);
xclose (result.stderr_pipe[0]);
xdup2 (result.stdout_pipe[1], STDOUT_FILENO);
xdup2 (result.stderr_pipe[1], STDERR_FILENO);
xclose (result.stdout_pipe[1]);
xclose (result.stderr_pipe[1]);
callback (closure);
/* Make sure that temporary files are deleted. */
support_delete_temp_files ();
_exit (0);
}
xclose (result.stdout_pipe[1]);
xclose (result.stderr_pipe[1]);
return result;
}
struct support_subprocess
support_subprogram (const char *file, char *const argv[], char *const envp[])
{
struct support_subprocess result = support_subprocess_init ();
posix_spawn_file_actions_t fa;
/* posix_spawn_file_actions_init does not fail. */
posix_spawn_file_actions_init (&fa);
xposix_spawn_file_actions_addclose (&fa, result.stdout_pipe[0]);
xposix_spawn_file_actions_addclose (&fa, result.stderr_pipe[0]);
xposix_spawn_file_actions_adddup2 (&fa, result.stdout_pipe[1], STDOUT_FILENO);
xposix_spawn_file_actions_adddup2 (&fa, result.stderr_pipe[1], STDERR_FILENO);
xposix_spawn_file_actions_addclose (&fa, result.stdout_pipe[1]);
xposix_spawn_file_actions_addclose (&fa, result.stderr_pipe[1]);
result.pid = xposix_spawn (file, &fa, NULL, argv,
envp == NULL ? environ : envp);
xclose (result.stdout_pipe[1]);
xclose (result.stderr_pipe[1]);
return result;
}
int
support_subprogram_wait (const char *file, char *const argv[])
{
posix_spawn_file_actions_t fa;
posix_spawn_file_actions_init (&fa);
struct support_subprocess res = support_subprocess_init ();
res.pid = xposix_spawn (file, &fa, NULL, argv, environ);
return support_process_wait (&res);
}
int
support_process_wait (struct support_subprocess *proc)
{
xclose (proc->stdout_pipe[0]);
xclose (proc->stderr_pipe[0]);
int status;
xwaitpid (proc->pid, &status, 0);
return status;
}
static bool
support_process_kill (int pid, int signo, int *status)
{
/* Kill the whole process group. */
kill (-pid, signo);
/* In case setpgid failed in the child, kill it individually too. */
kill (pid, signo);
/* Wait for it to terminate. */
pid_t killed;
for (int i = 0; i < 5; ++i)
{
int status;
killed = xwaitpid (pid, &status, WNOHANG|WUNTRACED);
if (killed != 0)
break;
/* Delay, give the system time to process the kill. If the
nanosleep() call return prematurely, all the better. We
won't restart it since this probably means the child process
finally died. */
nanosleep (&((struct timespec) { 0, 100000000 }), NULL);
}
if (killed != 0 && killed != pid)
return false;
return true;
}
int
support_process_terminate (struct support_subprocess *proc)
{
xclose (proc->stdout_pipe[0]);
xclose (proc->stderr_pipe[0]);
int status;
pid_t killed = xwaitpid (proc->pid, &status, WNOHANG|WUNTRACED);
if (killed != 0 && killed == proc->pid)
return status;
/* Subprocess is still running, terminate it. */
if (!support_process_kill (proc->pid, SIGTERM, &status) )
support_process_kill (proc->pid, SIGKILL, &status);
return status;
}
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