166 lines
4.5 KiB
C
166 lines
4.5 KiB
C
/****************************************************************************
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* sched/module/mod_rmmod.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <assert.h>
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#include <debug.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 <nuttx/lib/modlib.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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* handle - The module handler previously returned by insmod().
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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 void *handle)
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{
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FAR struct module_s *modp = (FAR struct module_s *)handle;
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int ret;
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DEBUGASSERT(modp != NULL);
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/* Get exclusive access to the module registry */
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modlib_registry_lock();
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/* Verify that the module is in the registry */
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ret = modlib_registry_verify(modp);
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if (ret < 0)
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{
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berr("ERROR: Failed to verify module: %d\n", ret);
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goto errout_with_lock;
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}
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#if CONFIG_MODLIB_MAXDEPEND > 0
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/* Refuse to remove any module that other modules may depend upon. */
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if (modp->dependents > 0)
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{
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berr("ERROR: Module has dependents: %d\n", modp->dependents);
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ret = -EBUSY;
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goto errout_with_lock;
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}
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#endif
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/* Is there an uninitializer? */
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if (modp->modinfo.uninitializer != NULL)
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{
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/* Try to uninitialize the module */
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ret = modp->modinfo.uninitializer(modp->modinfo.arg);
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/* Did the module successfully uninitialize? */
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if (ret < 0)
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{
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berr("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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modp->modinfo.uninitializer = NULL;
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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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modp->modinfo.arg = NULL;
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modp->modinfo.exports = NULL;
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modp->modinfo.nexports = 0;
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#endif
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}
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/* Release resources held by the module */
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if (modp->textalloc != NULL || modp->dataalloc != NULL)
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{
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/* Free the module memory
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* and nullify so that the memory cannot be freed again
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*/
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#if defined(CONFIG_ARCH_USE_TEXT_HEAP)
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up_textheap_free((FAR void *)modp->textalloc);
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#else
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kmm_free((FAR void *)modp->textalloc);
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#endif
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kmm_free((FAR void *)modp->dataalloc);
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modp->textalloc = NULL;
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modp->dataalloc = 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 = modlib_registry_del(modp);
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if (ret < 0)
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{
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berr("ERROR: Failed to remove the module from the registry: %d\n",
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ret);
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goto errout_with_lock;
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}
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#if CONFIG_MODLIB_MAXDEPEND > 0
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/* Eliminate any dependencies that this module has on other modules */
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modlib_undepend(modp);
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#endif
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modlib_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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modlib_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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