1/* Copyright (C) 1991-2020 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
23/* Execute PATH with all arguments after PATH until
24 a NULL pointer and environment from `environ'. */
25int
26execl (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}
57libc_hidden_def (execl)
58