161 lines
4.7 KiB
C
161 lines
4.7 KiB
C
/****************************************************************************
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* sched/module/module.c
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*
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* Copyright (C) 2015 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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#include <sys/types.h>
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#include <stdint.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 <nuttx/module.h>
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#include "module/module.h"
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#ifdef CONFIG_MODULE
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: rmmod
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*
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* Description:
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* Remove a previously installed module from memory.
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*
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* Input Parameters:
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*
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* modulename - The module name. This is the name module name that was
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* provided to insmod when the module was loaded.
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*
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* Returned Value:
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* Zero (OK) on success. On any failure, -1 (ERROR) is returned the
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* errno value is set appropriately.
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*
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****************************************************************************/
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int rmmod(FAR const char *modulename)
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{
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FAR struct module_s *modp;
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int ret = OK;
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DEBUGASSERT(modulename != NULL);
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/* Get exclusive access to the module registry */
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mod_registry_lock();
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/* Find the module entry for this modulename in the registry */
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modp = mod_registry_find(modulename);
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if (modp == NULL)
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{
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serr("ERROR: Failed to find module %s: %d\n", modulename, ret);
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ret = -ENOENT;
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goto errout_with_lock;
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}
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/* Is there an uninitializer? */
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if (modp->uninitializer != NULL)
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{
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/* Try to uninitializer the module */
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ret = modp->uninitializer(modp->arg);
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/* Did the module sucessfully uninitialize? */
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if (ret < 0)
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{
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serr("ERROR: Failed to uninitialize the module: %d\n", ret);
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goto errout_with_lock;
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}
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/* Nullify so that the uninitializer cannot be called again */
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#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MODULE)
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modp->initializer = NULL;
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#endif
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modp->uninitializer = NULL;
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modp->arg = NULL;
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}
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/* Release resources held by the module */
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if (modp->alloc != NULL)
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{
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/* Free the module memory */
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kmm_free((FAR void *)modp->alloc);
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/* Nullify so that the memory cannot be freed again */
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modp->alloc = NULL;
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#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_MODULE)
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modp->textsize = 0;
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modp->datasize = 0;
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#endif
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}
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/* Remove the module from the registry */
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ret = mod_registry_del(modp);
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if (ret < 0)
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{
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serr("ERROR: Failed to remove the module from the registry: %d\n", ret);
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goto errout_with_lock;
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}
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mod_registry_unlock();
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/* And free the registry entry */
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kmm_free(modp);
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return OK;
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errout_with_lock:
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mod_registry_unlock();
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set_errno(-ret);
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return ERROR;
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}
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#endif /* CONFIG_MODULE */
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