138 lines
4.0 KiB
C
138 lines
4.0 KiB
C
/****************************************************************************
|
|
* env_unsetenv.c
|
|
*
|
|
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#ifndef CONFIG_DISABLE_ENVIRON
|
|
|
|
#include <sched.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
|
|
#include "os_internal.h"
|
|
#include "env_internal.h"
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: unsetenv
|
|
*
|
|
* Description:
|
|
* The unsetenv() function deletes the variable name from the environment.
|
|
*
|
|
* Parameters:
|
|
* name - The name of the variable to delete
|
|
*
|
|
* Return Value:
|
|
* Zero on success
|
|
*
|
|
* Assumptions:
|
|
* Not called from an interrupt handler
|
|
*
|
|
****************************************************************************/
|
|
|
|
int unsetenv(const char *name)
|
|
{
|
|
FAR _TCB *rtcb;
|
|
FAR environ_t *envp;
|
|
FAR char *pvar;
|
|
int ret = OK;
|
|
|
|
/* Verify input parameter */
|
|
|
|
if (!name)
|
|
{
|
|
ret = EINVAL;
|
|
goto errout;
|
|
}
|
|
|
|
/* Get a reference to the thread-private environ in the TCB.*/
|
|
|
|
sched_lock();
|
|
rtcb = (FAR _TCB*)g_readytorun.head;
|
|
envp = rtcb->envp;
|
|
|
|
/* Check if the variable exists */
|
|
|
|
if ( envp && (pvar = env_findvar(envp, name)) != NULL)
|
|
{
|
|
int alloc;
|
|
environ_t *tmp;
|
|
|
|
/* It does! Remove the name=value pair from the environment. */
|
|
|
|
(void)env_removevar(envp, pvar);
|
|
|
|
/* Reallocate the new environment buffer */
|
|
|
|
alloc = envp->ev_alloc;
|
|
tmp = (environ_t*)realloc(envp, SIZEOF_ENVIRON_T(alloc));
|
|
if (!tmp)
|
|
{
|
|
ret = ENOMEM;
|
|
goto errout_with_lock;
|
|
}
|
|
|
|
/* Save the new environment pointer (it might have changed due to reallocation. */
|
|
|
|
rtcb->envp = tmp;
|
|
}
|
|
|
|
sched_unlock();
|
|
return OK;
|
|
|
|
errout_with_lock:
|
|
sched_unlock();
|
|
errout:
|
|
*get_errno_ptr() = ret;
|
|
return ERROR;
|
|
}
|
|
|
|
#endif /* CONFIG_DISABLE_ENVIRON */
|
|
|
|
|
|
|