b88a8cf39f
Signed-off-by: anjiahao <anjiahao@xiaomi.com>
167 lines
4.5 KiB
C
167 lines
4.5 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_fclose.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 <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include "libc.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: fclose
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*
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* Description:
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* The fclose() function will flush the stream pointed to by stream
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* (writing any buffered output data using lib_fflush()) and close the
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* underlying file descriptor.
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*
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* Returned Value:
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* Upon successful completion 0 is returned. Otherwise, EOF is returned
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* and the global variable errno is set to indicate the error. In either
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* case any further access (including another call to fclose()) to the
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* stream results in undefined behaviour.
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*
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****************************************************************************/
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int fclose(FAR FILE *stream)
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{
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FAR struct streamlist *slist;
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FAR FILE *prev = NULL;
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FAR FILE *next;
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int errcode = EINVAL;
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int ret = ERROR;
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int status;
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/* Verify that a stream was provided. */
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if (stream)
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{
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ret = OK;
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/* If the stream was opened for writing, then flush the stream */
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if ((stream->fs_oflags & O_WROK) != 0)
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{
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ret = lib_fflush(stream, true);
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errcode = get_errno();
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}
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/* Skip close the builtin streams(stdin, stdout and stderr) */
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if (stream == stdin || stream == stdout || stream == stderr)
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{
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goto done;
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}
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/* Remove FILE structure from the stream list */
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slist = nxsched_get_streams();
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lib_stream_semtake(slist);
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for (next = slist->sl_head; next; prev = next, next = next->fs_next)
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{
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if (next == stream)
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{
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if (next == slist->sl_head)
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{
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slist->sl_head = next->fs_next;
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}
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else
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{
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prev->fs_next = next->fs_next;
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}
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if (next == slist->sl_tail)
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{
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slist->sl_tail = prev;
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}
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break;
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}
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}
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lib_stream_semgive(slist);
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/* Check that the underlying file descriptor corresponds to an an open
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* file.
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*/
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if (stream->fs_fd >= 0)
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{
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/* Close the file descriptor and save the return status */
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status = close(stream->fs_fd);
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/* If close() returns an error but flush() did not then make sure
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* that we return the close() error condition.
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*/
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if (ret == OK)
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{
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ret = status;
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errcode = get_errno();
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}
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}
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#ifndef CONFIG_STDIO_DISABLE_BUFFERING
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/* Destroy the semaphore */
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nxrmutex_destroy(&stream->fs_lock);
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/* Release the buffer */
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if (stream->fs_bufstart != NULL &&
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(stream->fs_flags & __FS_FLAG_UBF) == 0)
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{
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lib_free(stream->fs_bufstart);
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}
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#endif
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lib_free(stream);
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}
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done:
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/* On an error, reset the errno to the first error encountered and return
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* EOF.
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*/
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if (ret != OK)
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{
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set_errno(errcode);
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return EOF;
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}
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/* Return success */
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return OK;
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}
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