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/* Copyright (C) 1991-2017 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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, see
<http://www.gnu.org/licenses/>. */
#include <unistd.h>
#include <stdarg.h>
#include <errno.h>
#include <sys/param.h>
/* Execute PATH with all arguments after PATH until a NULL pointer,
and the argument after that for environment. */
int
execle (const char *path, const char *arg, ...)
{
ptrdiff_t argc;
va_list ap;
va_start (ap, arg);
for (argc = 1; va_arg (ap, const char *); argc++)
{
if (argc == INT_MAX)
{
va_end (ap);
errno = E2BIG;
return -1;
}
}
va_end (ap);
/* Avoid dynamic memory allocation due two main issues:
1. The function should be async-signal-safe and a running on a signal
handler with a fail outcome might lead to malloc bad state.
2. It might be used in a vfork/clone(VFORK) scenario where using
malloc also might lead to internal bad state. */
ptrdiff_t i;
char *argv[argc + 1];
char **envp;
va_start (ap, arg);
argv[0] = (char *) arg;
for (i = 1; i <= argc; i++)
argv[i] = va_arg (ap, char *);
envp = va_arg (ap, char **);
va_end (ap);
return __execve (path, argv, envp);
}
libc_hidden_def (execle)
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