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/* Program execution for Emacs.
Copyright (C) 2023-2024 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs 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.
GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/wait.h>
#include "exec.h"
static void
print_usage (void)
{
fprintf (stderr, "test loader-name program [args...]\n"
"Run the given program using the specified loader.\n");
}
extern char **environ;
/* This program uses libexec to wrap the execution of a child
process. */
int
main (int argc, char **argv)
{
pid_t pid, child;
int sig;
sigset_t sigset;
/* Check that there are a sufficient number of arguments. */
if (argc < 3)
{
print_usage ();
return 1;
}
exec_init (argv[1]);
/* Block SIGCHLD to avoid reentrant modification of the child
process list. */
sigemptyset (&sigset);
sigaddset (&sigset, SIGCHLD);
sigprocmask (SIG_BLOCK, &sigset, NULL);
if (!(pid = fork ()))
{
tracing_execve (argv[2], argv + 2, environ);
fprintf (stderr, "tracing_execve: %s\n",
strerror (errno));
exit (1);
}
else if (after_fork (pid))
{
fprintf (stderr, "after_fork: %s\n",
strerror (errno));
exit (1);
}
/* Now start waiting for child processes to exit. */
while (true)
{
child = exec_waitpid (-1, &sig, 0);
/* If pid is -1, a system call has been handled. */
if (child == -1)
continue;
/* If the main process exits, then exit as well. */
if (child == pid && !WIFSTOPPED (sig))
return (WIFEXITED (sig)
? WEXITSTATUS (sig)
: WTERMSIG (sig));
}
}
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