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/**
* slibc — Yet another C library
* Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
/**
* The process's environment variables.
*/
extern char** environ;
/**
* This function shall in some manner clear the environment.
*
* To minimise the risk of fatal race conditions, this
* implementation will set the first element in
* `extern char** environ` to `NULL`, unless `environ`
* itself is `NULL`. This also reduces that risk that
* programs stop working when switching to slibc.
*
* The exact behaviour of this function depeneds of the
* implementations. Depending on the implementation,
* this may or may not entail setting `environ` to `NULL`.
*
* This function is a very common non-standard extension.
*
* @etymology (Clear) the (env)ironment!
*
* @returns This function is always successful, and will
* always return zero. However, according to the
* specifications, it shall return -1 on failure.
*
* @since Always.
*/
int clearenv(void)
{
if (environ != NULL)
*environ = NULL;
return 0;
}
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