Fix startup to security-relevant statically linked binaries.
[glibc.git] / posix / execl.c
blob7f822d0142e7ed8b5b425a3a393388db2e1edf62
1 /* Copyright (C) 1991,92,94,97,98,99,2002,2005 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #include <unistd.h>
20 #include <stdarg.h>
21 #include <stddef.h>
22 #include <stdlib.h>
23 #include <string.h>
25 #include <stackinfo.h>
28 /* Execute PATH with all arguments after PATH until
29 a NULL pointer and environment from `environ'. */
30 int
31 execl (const char *path, const char *arg, ...)
33 #define INITIAL_ARGV_MAX 1024
34 size_t argv_max = INITIAL_ARGV_MAX;
35 const char *initial_argv[INITIAL_ARGV_MAX];
36 const char **argv = initial_argv;
37 va_list args;
39 argv[0] = arg;
41 va_start (args, arg);
42 unsigned int i = 0;
43 while (argv[i++] != NULL)
45 if (i == argv_max)
47 argv_max *= 2;
48 const char **nptr = realloc (argv == initial_argv ? NULL : argv,
49 argv_max * sizeof (const char *));
50 if (nptr == NULL)
52 if (argv != initial_argv)
53 free (argv);
54 return -1;
56 if (argv == initial_argv)
57 /* We have to copy the already filled-in data ourselves. */
58 memcpy (nptr, argv, i * sizeof (const char *));
60 argv = nptr;
63 argv[i] = va_arg (args, const char *);
65 va_end (args);
67 int ret = __execve (path, (char *const *) argv, __environ);
68 if (argv != initial_argv)
69 free (argv);
71 return ret;
73 libc_hidden_def (execl)