138 lines
4.0 KiB
C
138 lines
4.0 KiB
C
/****************************************************************************
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* sched/env_unsetenv.c
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*
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* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifndef CONFIG_DISABLE_ENVIRON
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#include <sched.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "os_internal.h"
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#include "env_internal.h"
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: unsetenv
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*
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* Description:
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* The unsetenv() function deletes the variable name from the environment.
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*
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* Parameters:
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* name - The name of the variable to delete
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*
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* Return Value:
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* Zero on success
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*
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* Assumptions:
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* Not called from an interrupt handler
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*
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****************************************************************************/
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int unsetenv(const char *name)
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{
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FAR _TCB *rtcb;
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FAR environ_t *envp;
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FAR char *pvar;
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int ret = OK;
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/* Verify input parameter */
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if (!name)
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{
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ret = EINVAL;
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goto errout;
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}
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/* Get a reference to the thread-private environ in the TCB.*/
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sched_lock();
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rtcb = (FAR _TCB*)g_readytorun.head;
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envp = rtcb->envp;
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/* Check if the variable exists */
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if ( envp && (pvar = env_findvar(envp, name)) != NULL)
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{
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int alloc;
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environ_t *tmp;
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/* It does! Remove the name=value pair from the environment. */
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(void)env_removevar(envp, pvar);
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/* Reallocate the new environment buffer */
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alloc = envp->ev_alloc;
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tmp = (environ_t*)realloc(envp, SIZEOF_ENVIRON_T(alloc));
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if (!tmp)
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{
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ret = ENOMEM;
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goto errout_with_lock;
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}
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/* Save the new environment pointer (it might have changed due to reallocation. */
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rtcb->envp = tmp;
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}
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sched_unlock();
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return OK;
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errout_with_lock:
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sched_unlock();
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errout:
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*get_errno_ptr() = ret;
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return ERROR;
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}
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#endif /* CONFIG_DISABLE_ENVIRON */
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