-/* Copyright (C) 1991,93,96,97,98,99,2002 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
-#include <alloca.h>
#include <unistd.h>
#include <stdarg.h>
-#include <stddef.h>
-#include <string.h>
-
-#include <stackinfo.h>
+#include <errno.h>
+#include <sys/param.h>
/* Execute FILE, searching in the `PATH' environment variable if
it contains no slashes, with all arguments after FILE until a
int
execlp (const char *file, const char *arg, ...)
{
- size_t argv_max = 1024;
- const char **argv = alloca (argv_max * sizeof (const char *));
- unsigned int i;
- va_list args;
-
- argv[0] = arg;
-
- va_start (args, arg);
- i = 0;
- while (argv[i++] != NULL)
+ ptrdiff_t argc;
+ va_list ap;
+ va_start (ap, arg);
+ for (argc = 1; va_arg (ap, const char *); argc++)
{
- if (i == argv_max)
+ if (argc == INT_MAX)
{
- const char **nptr = alloca ((argv_max *= 2) * sizeof (const char *));
-
-#ifndef _STACK_GROWS_UP
- if ((char *) nptr + argv_max == (char *) argv)
- {
- /* Stack grows down. */
- argv = (const char **) memcpy (nptr, argv,
- i * sizeof (const char *));
- argv_max += i;
- }
- else
-#endif
-#ifndef _STACK_GROWS_DOWN
- if ((char *) argv + i == (char *) nptr)
- /* Stack grows up. */
- argv_max += i;
- else
-#endif
- /* We have a hole in the stack. */
- argv = (const char **) memcpy (nptr, argv,
- i * sizeof (const char *));
+ va_end (ap);
+ errno = E2BIG;
+ return -1;
}
-
- argv[i] = va_arg (args, const char *);
}
- va_end (args);
-
- return execvp (file, (char *const *) argv);
+ va_end (ap);
+
+ /* Although posix does not state execlp as an async-safe function
+ it can not use malloc to allocate the arguments since it might
+ be used in a vfork scenario and it may lead to malloc internal
+ bad state. */
+ ptrdiff_t i;
+ char *argv[argc + 1];
+ va_start (ap, arg);
+ argv[0] = (char *) arg;
+ for (i = 1; i <= argc; i++)
+ argv[i] = va_arg (ap, char *);
+ va_end (ap);
+
+ return __execvpe (file, argv, __environ);
}
libc_hidden_def (execlp)