6a3c2aded6
* Simplify EINTR/ECANCEL error handling 1. Add semaphore uninterruptible wait function 2 .Replace semaphore wait loop with a single uninterruptible wait 3. Replace all sem_xxx to nxsem_xxx * Unify the void cast usage 1. Remove void cast for function because many place ignore the returned value witout cast 2. Replace void cast for variable with UNUSED macro
136 lines
4.1 KiB
C
136 lines
4.1 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, 2018 Gregory Nutt. All rights
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* 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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* Input 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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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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if (newsize <= 0)
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{
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/* Free the old environment (if there was one) */
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if (group->tg_envp != NULL)
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{
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kumm_free(group->tg_envp);
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group->tg_envp = NULL;
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}
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group->tg_envsize = 0;
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}
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else
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{
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/* Reallocate the environment to reclaim a little memory */
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newenvp = (FAR char *)kumm_realloc(group->tg_envp, newsize);
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if (newenvp == NULL)
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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
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* to 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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}
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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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