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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 <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <stackinfo.h>
/* Execute FILE, searching in the `PATH' environment variable if
it contains no slashes, with all arguments after FILE until a
NULL pointer and environment from `environ'. */
int
execlp (const char *file, const char *arg, ...)
{
#define INITIAL_ARGV_MAX 1024
size_t argv_max = INITIAL_ARGV_MAX;
const char *initial_argv[INITIAL_ARGV_MAX];
const char **argv = initial_argv;
va_list args;
argv[0] = arg;
va_start (args, arg);
unsigned int i = 0;
while (argv[i++] != NULL)
{
if (i == argv_max)
{
argv_max *= 2;
const char **nptr = realloc (argv == initial_argv ? NULL : argv,
argv_max * sizeof (const char *));
if (nptr == NULL)
{
if (argv != initial_argv)
free (argv);
va_end (args);
return -1;
}
if (argv == initial_argv)
/* We have to copy the already filled-in data ourselves. */
memcpy (nptr, argv, i * sizeof (const char *));
argv = nptr;
}
argv[i] = va_arg (args, const char *);
}
va_end (args);
int ret = execvp (file, (char *const *) argv);
if (argv != initial_argv)
free (argv);
return ret;
}
libc_hidden_def (execlp)
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