1 /* Copyright (C) 1991-2022 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 <https://www.gnu.org/licenses/>. */
17
18 #include <unistd.h>
19 #include <errno.h>
20 #include <stdarg.h>
21 #include <sys/param.h>
22 #include <stddef.h>
23
24 /* Execute PATH with all arguments after PATH until
25 a NULL pointer and environment from `environ'. */
26 int
execl(const char * path,const char * arg,...)27 execl (const char *path, const char *arg, ...)
28 {
29 ptrdiff_t argc;
30 va_list ap;
31 va_start (ap, arg);
32 for (argc = 1; va_arg (ap, const char *); argc++)
33 {
34 if (argc == INT_MAX)
35 {
36 va_end (ap);
37 errno = E2BIG;
38 return -1;
39 }
40 }
41 va_end (ap);
42
43 /* Avoid dynamic memory allocation due two main issues:
44 1. The function should be async-signal-safe and a running on a signal
45 handler with a fail outcome might lead to malloc bad state.
46 2. It might be used in a vfork/clone(VFORK) scenario where using
47 malloc also might lead to internal bad state. */
48 ptrdiff_t i;
49 char *argv[argc + 1];
50 va_start (ap, arg);
51 argv[0] = (char *) arg;
52 for (i = 1; i <= argc; i++)
53 argv[i] = va_arg (ap, char *);
54 va_end (ap);
55
56 return __execve (path, argv, __environ);
57 }
58 libc_hidden_def (execl)
59