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bfff8b1b | 1 | /* Copyright (C) 1991-2017 Free Software Foundation, Inc. |
c84142e8 | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
c84142e8 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 8 | |
c84142e8 UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
28f540f4 | 18 | #include <unistd.h> |
f83bb9b8 | 19 | #include <errno.h> |
28f540f4 | 20 | #include <stdarg.h> |
f83bb9b8 | 21 | #include <sys/param.h> |
28f540f4 RM |
22 | |
23 | /* Execute PATH with all arguments after PATH until | |
24 | a NULL pointer and environment from `environ'. */ | |
25 | int | |
c84142e8 | 26 | execl (const char *path, const char *arg, ...) |
28f540f4 | 27 | { |
f83bb9b8 AZ |
28 | ptrdiff_t argc; |
29 | va_list ap; | |
30 | va_start (ap, arg); | |
31 | for (argc = 1; va_arg (ap, const char *); argc++) | |
28f540f4 | 32 | { |
f83bb9b8 | 33 | if (argc == INT_MAX) |
c84142e8 | 34 | { |
f83bb9b8 AZ |
35 | va_end (ap); |
36 | errno = E2BIG; | |
37 | return -1; | |
c84142e8 | 38 | } |
c84142e8 | 39 | } |
f83bb9b8 AZ |
40 | va_end (ap); |
41 | ||
42 | /* Avoid dynamic memory allocation due two main issues: | |
43 | 1. The function should be async-signal-safe and a running on a signal | |
44 | handler with a fail outcome might lead to malloc bad state. | |
45 | 2. It might be used in a vfork/clone(VFORK) scenario where using | |
46 | malloc also might lead to internal bad state. */ | |
47 | ptrdiff_t i; | |
48 | char *argv[argc + 1]; | |
49 | va_start (ap, arg); | |
50 | argv[0] = (char *) arg; | |
51 | for (i = 1; i <= argc; i++) | |
52 | argv[i] = va_arg (ap, char *); | |
53 | va_end (ap); | |
54 | ||
55 | return __execve (path, argv, __environ); | |
28f540f4 | 56 | } |
c41f555e | 57 | libc_hidden_def (execl) |