1/* Copyright (C) 1991-2016 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 <stdarg.h>
20#include <stddef.h>
21#include <stdlib.h>
22#include <string.h>
23
24#include <stackinfo.h>
25
26
27/* Execute PATH with all arguments after PATH until
28 a NULL pointer and environment from `environ'. */
29int
30execl (const char *path, const char *arg, ...)
31{
32#define INITIAL_ARGV_MAX 1024
33 size_t argv_max = INITIAL_ARGV_MAX;
34 const char *initial_argv[INITIAL_ARGV_MAX];
35 const char **argv = initial_argv;
36 va_list args;
37
38 argv[0] = arg;
39
40 va_start (args, arg);
41 unsigned int i = 0;
42 while (argv[i++] != NULL)
43 {
44 if (i == argv_max)
45 {
46 argv_max *= 2;
47 const char **nptr = realloc (argv == initial_argv ? NULL : argv,
48 argv_max * sizeof (const char *));
49 if (nptr == NULL)
50 {
51 if (argv != initial_argv)
52 free (argv);
53 va_end (args);
54 return -1;
55 }
56 if (argv == initial_argv)
57 /* We have to copy the already filled-in data ourselves. */
58 memcpy (nptr, argv, i * sizeof (const char *));
59
60 argv = nptr;
61 }
62
63 argv[i] = va_arg (args, const char *);
64 }
65 va_end (args);
66
67 int ret = __execve (path, (char *const *) argv, __environ);
68 if (argv != initial_argv)
69 free (argv);
70
71 return ret;
72}
73libc_hidden_def (execl)
74