1 | /* Copyright (C) 1991-2018 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
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. |
8 | |
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. |
13 | |
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 | <http://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <unistd.h> |
19 | #include <errno.h> |
20 | #include <stdarg.h> |
21 | #include <sys/param.h> |
22 | |
23 | /* Execute PATH with all arguments after PATH until |
24 | a NULL pointer and environment from `environ'. */ |
25 | int |
26 | execl (const char *path, const char *arg, ...) |
27 | { |
28 | ptrdiff_t argc; |
29 | va_list ap; |
30 | va_start (ap, arg); |
31 | for (argc = 1; va_arg (ap, const char *); argc++) |
32 | { |
33 | if (argc == INT_MAX) |
34 | { |
35 | va_end (ap); |
36 | errno = E2BIG; |
37 | return -1; |
38 | } |
39 | } |
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); |
56 | } |
57 | libc_hidden_def (execl) |
58 | |