121 lines
3.7 KiB
C
121 lines
3.7 KiB
C
/****************************************************************************
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* sched/environ/env_unsetenv.c
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*
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* Copyright (C) 2007, 2009, 2011, 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 <errno.h>
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#include <nuttx/kmalloc.h>
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#include "sched/sched.h"
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#include "environ/environ.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: 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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* Returned 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(FAR const char *name)
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{
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FAR struct tcb_s *rtcb = this_task();
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FAR struct task_group_s *group = rtcb->group;
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FAR char *pvar;
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FAR char *newenvp;
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int newsize;
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int ret = OK;
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DEBUGASSERT(name && group);
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/* Check if the variable exists */
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sched_lock();
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if (group && (pvar = env_findvar(group, name)) != NULL)
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{
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/* It does! Remove the name=value pair from the environment. */
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(void)env_removevar(group, pvar);
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/* Reallocate the new environment buffer */
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newsize = group->tg_envsize;
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newenvp = (FAR char *)kumm_realloc(group->tg_envp, newsize);
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if (!newenvp)
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{
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set_errno(ENOMEM);
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ret = ERROR;
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}
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else
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{
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/* Save the new environment pointer (it might have changed due to
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* reallocation.
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*/
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group->tg_envp = newenvp;
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}
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}
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sched_unlock();
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return ret;
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}
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#endif /* CONFIG_DISABLE_ENVIRON */
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