156 lines
4.6 KiB
C
156 lines
4.6 KiB
C
/****************************************************************************
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* libs/libc/misc/lib_stream.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 <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/sched.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/lib/lib.h>
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#include "libc.h"
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#if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lib_stream_initialize
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*
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* Description:
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* This function is called when a new task is allocated. It initializes
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* the streamlist instance that is stored in the task group.
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*
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****************************************************************************/
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#ifdef CONFIG_FILE_STREAM
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void lib_stream_initialize(FAR struct task_group_s *group)
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{
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FAR struct streamlist *list;
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#ifdef CONFIG_MM_KERNEL_HEAP
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DEBUGASSERT(group && group->tg_streamlist);
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list = group->tg_streamlist;
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#else
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DEBUGASSERT(group);
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list = &group->tg_streamlist;
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#endif
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/* Initialize the list access mutex */
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_SEM_INIT(&list->sl_sem, 0, 1);
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list->sl_head = NULL;
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list->sl_tail = NULL;
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/* Initialize stdin, stdout and stderr stream */
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list->sl_std[0].fs_fd = -1;
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lib_sem_initialize(&list->sl_std[0]);
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list->sl_std[1].fs_fd = -1;
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lib_sem_initialize(&list->sl_std[1]);
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list->sl_std[2].fs_fd = -1;
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lib_sem_initialize(&list->sl_std[2]);
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}
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#endif /* CONFIG_FILE_STREAM */
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/****************************************************************************
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* Name: lib_stream_release
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*
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* Description:
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* This function is called when a TCB is destroyed. Note that it does not
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* close the files by releasing the inode. That happens separately when
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* the file descriptor list is freed.
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*
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****************************************************************************/
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#ifdef CONFIG_FILE_STREAM
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void lib_stream_release(FAR struct task_group_s *group)
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{
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FAR struct streamlist *list;
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#ifdef CONFIG_MM_KERNEL_HEAP
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DEBUGASSERT(group && group->tg_streamlist);
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list = group->tg_streamlist;
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#else
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DEBUGASSERT(group);
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list = &group->tg_streamlist;
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#endif
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/* Destroy the semaphore and release the filelist */
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_SEM_DESTROY(&list->sl_sem);
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/* Release each stream in the list */
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list->sl_tail = NULL;
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while (list->sl_head != NULL)
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{
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FAR struct file_struct *stream = list->sl_head;
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list->sl_head = stream->fs_next;
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#ifndef CONFIG_STDIO_DISABLE_BUFFERING
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/* Destroy the semaphore that protects the IO buffer */
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_SEM_DESTROY(&stream->fs_sem);
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#endif
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/* Release the stream */
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#ifdef CONFIG_BUILD_KERNEL
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/* If the exiting group is unprivileged, then it has an address
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* environment. Don't bother to release the memory in this case...
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* There is no point since the memory lies in the user heap which
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* will be destroyed anyway. But if this is a privileged group,
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* when we still have to release the memory using the kernel
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* allocator.
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*/
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if ((group->tg_flags & GROUP_FLAG_PRIVILEGED) != 0)
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#endif
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{
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group_free(group, stream);
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}
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}
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/* Destroy stdin, stdout and stderr stream */
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#ifndef CONFIG_STDIO_DISABLE_BUFFERING
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_SEM_DESTROY(&list->sl_std[0].fs_sem);
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_SEM_DESTROY(&list->sl_std[1].fs_sem);
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_SEM_DESTROY(&list->sl_std[2].fs_sem);
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#endif
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}
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#endif /* CONFIG_FILE_STREAM */
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#endif /* CONFIG_BUILD_FLAT || __KERNEL__ */
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