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glibc/posix/execle.c
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/* Copyright (C) 1991-2016 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) |