mirror of
https://https.git.savannah.gnu.org/git/gnulib.git
synced 2026-06-15 15:25:49 +00:00
Collin Funk
79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/* execve() function: Execute a program, replacing the current process.
|
|
Copyright (C) 2020-2026 Free Software Foundation, Inc.
|
|
|
|
This file 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.
|
|
|
|
This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
/* Written by Bruno Haible <bruno@clisp.org>, 2020. */
|
|
|
|
/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
|
|
may optimize away the program == NULL and argv == NULL tests below. */
|
|
#define _GL_ARG_NONNULL(params)
|
|
|
|
#include <config.h>
|
|
|
|
/* Specification. */
|
|
#include <unistd.h>
|
|
|
|
#if defined _WIN32 && !defined __CYGWIN__
|
|
|
|
# include <errno.h>
|
|
# include <stdio.h>
|
|
# include <spawn.h>
|
|
|
|
# include <sys/types.h>
|
|
# include <sys/wait.h>
|
|
|
|
int
|
|
execve (const char *program, char * const *argv, char * const *env)
|
|
{
|
|
if (program == NULL
|
|
|| argv == NULL
|
|
/* The callee is not expecting a NULL argv[0]. */
|
|
|| argv[0] == NULL
|
|
|| env == NULL)
|
|
{
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
pid_t child;
|
|
int err = posix_spawn (&child, program, NULL, NULL, argv, env);
|
|
if (err == 0)
|
|
{
|
|
/* Close all file descriptors, so that
|
|
- for opened files, the child may close and unlink() the file,
|
|
- for pipe handles, the pipe's reader or writer does not get stuck.
|
|
Ideally we would also suspend all other threads and close all other
|
|
HANDLEs (not associated with file descriptors) and SOCKETs, but we
|
|
can't do so since we have no way to enumerate them. */
|
|
{
|
|
unsigned int fdmax = _getmaxstdio ();
|
|
for (unsigned int fd = 0; fd < fdmax; fd++)
|
|
close (fd);
|
|
}
|
|
|
|
/* Wait until the child process is terminated. */
|
|
int status = 127;
|
|
waitpid (child, &status, 0);
|
|
int exitcode = status;
|
|
|
|
/* Pass its exit code to the parent process. */
|
|
_exit (exitcode);
|
|
}
|
|
errno = err;
|
|
return -1;
|
|
}
|
|
|
|
#endif
|