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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/unix/sysv/linux/fexecve.c
1 /* Copyright (C) 1994-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
26 #include <sys/syscall.h>
27 #include <kernel-features.h>
30 /* Execute the file FD refers to, overlaying the running program image.
31 ARGV and ENVP are passed to the new program, as for `execve'. */
33 fexecve (int fd
, char *const argv
[], char *const envp
[])
35 if (fd
< 0 || argv
== NULL
|| envp
== NULL
)
42 /* Avoid implicit array coercion in syscall macros. */
43 INLINE_SYSCALL (execveat
, 5, fd
, "", &argv
[0], &envp
[0], AT_EMPTY_PATH
);
44 # ifndef __ASSUME_EXECVEAT
50 #ifndef __ASSUME_EXECVEAT
51 /* We use the /proc filesystem to get the information. If it is not
53 char buf
[sizeof "/proc/self/fd/" + sizeof (int) * 3];
54 __snprintf (buf
, sizeof (buf
), "/proc/self/fd/%d", fd
);
56 /* We do not need the return value. */
57 __execve (buf
, argv
, envp
);
61 /* We come here only if the 'execve' call fails. Determine whether
62 /proc is mounted. If not we return ENOSYS. */
64 if (stat ("/proc/self/fd", &st
) != 0 && errno
== ENOENT
)