1 /* Copyright (C) 1991, 92, 94, 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>
28 # define __environ environ
31 /* Execute PATH with all arguments after PATH until
32 a NULL pointer and environment from `environ'. */
34 execl (const char *path
, const char *arg
, ...)
36 size_t argv_max
= 1024;
37 const char **argv
= alloca (argv_max
* sizeof (const char *));
45 while (argv
[i
++] != NULL
)
49 const char **nptr
= alloca ((argv_max
*= 2) * sizeof (const char *));
51 #ifndef _STACK_GROWS_UP
52 if ((char *) nptr
+ argv_max
== (char *) argv
)
54 /* Stack grows down. */
55 argv
= (const char **) memcpy (nptr
, argv
, i
);
60 #ifndef _STACK_GROWS_DOWN
61 if ((char *) argv
+ i
== (char *) nptr
)
66 /* We have a hole in the stack. */
67 argv
= (const char **) memcpy (nptr
, argv
, i
);
70 argv
[i
] = va_arg (args
, const char *);
74 return __execve (path
, (char *const *) argv
, __environ
);