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 | /* Execute PATH with all arguments after PATH until a NULL pointer, |
27 | and the argument after that for environment. */ |
28 | int |
29 | execle (const char *path, const char *arg, ...) |
30 | { |
31 | #define INITIAL_ARGV_MAX 1024 |
32 | size_t argv_max = INITIAL_ARGV_MAX; |
33 | const char *initial_argv[INITIAL_ARGV_MAX]; |
34 | const char **argv = initial_argv; |
35 | va_list args; |
36 | argv[0] = arg; |
37 | |
38 | va_start (args, arg); |
39 | unsigned int i = 0; |
40 | while (argv[i++] != NULL) |
41 | { |
42 | if (i == argv_max) |
43 | { |
44 | argv_max *= 2; |
45 | const char **nptr = realloc (argv == initial_argv ? NULL : argv, |
46 | argv_max * sizeof (const char *)); |
47 | if (nptr == NULL) |
48 | { |
49 | if (argv != initial_argv) |
50 | free (argv); |
51 | va_end (args); |
52 | return -1; |
53 | } |
54 | if (argv == initial_argv) |
55 | /* We have to copy the already filled-in data ourselves. */ |
56 | memcpy (nptr, argv, i * sizeof (const char *)); |
57 | |
58 | argv = nptr; |
59 | } |
60 | |
61 | argv[i] = va_arg (args, const char *); |
62 | } |
63 | |
64 | const char *const *envp = va_arg (args, const char *const *); |
65 | va_end (args); |
66 | |
67 | int ret = __execve (path, (char *const *) argv, (char *const *) envp); |
68 | if (argv != initial_argv) |
69 | free (argv); |
70 | |
71 | return ret; |
72 | } |
73 | libc_hidden_def (execle) |
74 | |