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Diffstat (limited to 'nuttx/lib/stdio/lib_fclose.c')
| -rw-r--r-- | nuttx/lib/stdio/lib_fclose.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/nuttx/lib/stdio/lib_fclose.c b/nuttx/lib/stdio/lib_fclose.c new file mode 100644 index 000000000..8cecb8af3 --- /dev/null +++ b/nuttx/lib/stdio/lib_fclose.c @@ -0,0 +1,154 @@ +/**************************************************************************** + * lib/stdio/lib_fclose.c + * + * Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <unistd.h> +#include <stdlib.h> +#include <fcntl.h> +#include <string.h> +#include <errno.h> + +#include "lib_internal.h" + +/**************************************************************************** + * Global Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: fclose + * + * Description + * The fclose() function will flush the stream pointed to by stream + * (writing any buffered output data using lib_fflush()) and close the + * underlying file descriptor. + * + * Returned Value: + * Upon successful completion 0 is returned. Otherwise, EOF is returned + * and the global variable errno is set to indicate the error. In either + * case any further access (including another call to fclose()) to the + * stream results in undefined behaviour. + * + ****************************************************************************/ + +int fclose(FAR FILE *stream) +{ + int err = EINVAL; + int ret = ERROR; + int status; + + /* Verify that a stream was provided. */ + + if (stream) + { + /* Check that the underlying file descriptor corresponds to an an open + * file. + */ + + ret = OK; + if (stream->fs_filedes >= 0) + { + /* If the stream was opened for writing, then flush the stream */ + + if ((stream->fs_oflags & O_WROK) != 0) + { + ret = lib_fflush(stream, true); + err = errno; + } + + /* Close the underlying file descriptor and save the return status */ + + status = close(stream->fs_filedes); + + /* If close() returns an error but flush() did not then make sure + * that we return the close() error condition. + */ + + if (ret == OK) + { + ret = status; + err = errno; + } + } + +#if CONFIG_STDIO_BUFFER_SIZE > 0 + /* Destroy the semaphore */ + + sem_destroy(&stream->fs_sem); + + /* Release the buffer */ + + if (stream->fs_bufstart) + { + lib_free(stream->fs_bufstart); + } + + /* Clear the whole structure */ + + memset(stream, 0, sizeof(FILE)); +#else +#if CONFIG_NUNGET_CHARS > 0 + /* Reset the number of ungetc characters */ + + stream->fs_nungotten = 0; +#endif + /* Reset the flags */ + + stream->fs_oflags = 0; +#endif + /* Setting the fs_filedescriptor to -1 makes the stream available for reuse */ + + stream->fs_filedes = -1; + } + + /* On an error, reset the errno to the first error encountered and return + * EOF. + */ + + if (ret != OK) + { + set_errno(err); + return EOF; + } + + /* Return success */ + + return OK; +} + |