1b32fc1642
If the environment variable does not exist, the function succeeds, as defined by POSIX.
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/****************************************************************************
|
|
* sched/environ/env_unsetenv.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#ifndef CONFIG_DISABLE_ENVIRON
|
|
|
|
#include <sched.h>
|
|
#include <string.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/kmalloc.h>
|
|
|
|
#include "sched/sched.h"
|
|
#include "environ/environ.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: unsetenv
|
|
*
|
|
* Description:
|
|
* The unsetenv() function deletes the variable name from the environment.
|
|
*
|
|
* Input Parameters:
|
|
* name - The name of the variable to delete
|
|
*
|
|
* Returned Value:
|
|
* Zero on success
|
|
*
|
|
* Assumptions:
|
|
* Not called from an interrupt handler
|
|
*
|
|
****************************************************************************/
|
|
|
|
int unsetenv(FAR const char *name)
|
|
{
|
|
FAR struct tcb_s *rtcb = this_task();
|
|
FAR struct task_group_s *group = rtcb->group;
|
|
int idx;
|
|
|
|
DEBUGASSERT(name && group);
|
|
|
|
/* Check if the variable exists */
|
|
|
|
sched_lock();
|
|
if (group && (idx = env_findvar(group, name)) >= 0)
|
|
{
|
|
/* It does! Remove the name=value pair from the environment. */
|
|
|
|
env_removevar(group, idx);
|
|
}
|
|
|
|
sched_unlock();
|
|
return OK;
|
|
}
|
|
|
|
#endif /* CONFIG_DISABLE_ENVIRON */
|