1 /* Copyright (C) 1991, 93, 96, 97, 98, 99 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
25 #include <stackinfo.h>
27 /* Execute FILE, searching in the `PATH' environment variable if
28 it contains no slashes, with all arguments after FILE until a
29 NULL pointer and environment from `environ'. */
31 execlp (const char *file, const char *arg, ...)
33 size_t argv_max = 1024;
34 const char **argv = alloca (argv_max * sizeof (const char *));
42 while (argv[i++] != NULL)
46 const char **nptr = alloca ((argv_max *= 2) * sizeof (const char *));
48 #ifndef _STACK_GROWS_UP
49 if ((char *) nptr + argv_max == (char *) argv)
51 /* Stack grows down. */
52 argv = (const char **) memcpy (nptr, argv,
53 i * sizeof (const char *));
58 #ifndef _STACK_GROWS_DOWN
59 if ((char *) argv + i == (char *) nptr)
64 /* We have a hole in the stack. */
65 argv = (const char **) memcpy (nptr, argv,
66 i * sizeof (const char *));
69 argv[i] = va_arg (args, const char *);
73 return execvp (file, (char *const *) argv);