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138 lines
4.0 KiB
138 lines
4.0 KiB
/**************************************************************************** |
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* sched/env_unsetenv.c |
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* |
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* Copyright (C) 2007, 2009, 2011 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 "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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* 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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* 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*)krealloc(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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errno = ret; |
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return ERROR; |
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} |
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#endif /* CONFIG_DISABLE_ENVIRON */ |
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