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b168057a | 1 | /* Copyright (C) 1991-2015 Free Software Foundation, Inc. |
c84142e8 | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
c84142e8 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 8 | |
c84142e8 UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <unistd.h> |
19 | #include <stdarg.h> | |
20 | #include <stddef.h> | |
57b47af9 | 21 | #include <stdlib.h> |
c84142e8 | 22 | #include <string.h> |
28f540f4 | 23 | |
c4563d2d UD |
24 | #include <stackinfo.h> |
25 | ||
28f540f4 RM |
26 | /* Execute FILE, searching in the `PATH' environment variable if |
27 | it contains no slashes, with all arguments after FILE until a | |
28 | NULL pointer and environment from `environ'. */ | |
29 | int | |
b33f91e9 | 30 | execlp (const char *file, const char *arg, ...) |
28f540f4 | 31 | { |
57b47af9 UD |
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; | |
28f540f4 RM |
36 | va_list args; |
37 | ||
c84142e8 UD |
38 | argv[0] = arg; |
39 | ||
b33f91e9 | 40 | va_start (args, arg); |
57b47af9 | 41 | unsigned int i = 0; |
b0df72f4 | 42 | while (argv[i++] != NULL) |
c84142e8 UD |
43 | { |
44 | if (i == argv_max) | |
45 | { | |
57b47af9 UD |
46 | argv_max *= 2; |
47 | const char **nptr = realloc (argv == initial_argv ? NULL : argv, | |
48 | argv_max * sizeof (const char *)); | |
49 | if (nptr == NULL) | |
c84142e8 | 50 | { |
57b47af9 UD |
51 | if (argv != initial_argv) |
52 | free (argv); | |
53 | return -1; | |
c84142e8 | 54 | } |
57b47af9 UD |
55 | if (argv == initial_argv) |
56 | /* We have to copy the already filled-in data ourselves. */ | |
57 | memcpy (nptr, argv, i * sizeof (const char *)); | |
58 | ||
59 | argv = nptr; | |
c84142e8 | 60 | } |
28f540f4 | 61 | |
c84142e8 UD |
62 | argv[i] = va_arg (args, const char *); |
63 | } | |
28f540f4 RM |
64 | va_end (args); |
65 | ||
57b47af9 UD |
66 | int ret = execvp (file, (char *const *) argv); |
67 | if (argv != initial_argv) | |
68 | free (argv); | |
69 | ||
70 | return ret; | |
28f540f4 | 71 | } |
c41f555e | 72 | libc_hidden_def (execlp) |