NAME
fclose - close a stream
SYNOPSIS
#include <stdio.h>
int fclose(FILE *stream);
DESCRIPTION
The fclose() function shall cause the stream pointed to by stream to be
flushed and the associated file to be closed. Any unwritten buffered
data for the stream shall be written to the file; any unread buffered
data shall be discarded. Whether or not the call succeeds, the stream
shall be disassociated from the file and any buffer set by the setbuf()
or setvbuf() function shall be disassociated from the stream. If the
associated buffer was automatically allocated, it shall be deallocated.
The fclose() function shall mark for update the st_ctime and st_mtime
fields of the underlying file, if the stream was writable, and if
buffered data remains that has not yet been written to the file. The
fclose() function shall perform the equivalent of a close() on the file
descriptor that is associated with the stream pointed to by stream.
After the call to fclose(), any use of stream results in undefined
behavior.
RETURN VALUE
Upon successful completion, fclose() shall return 0; otherwise, it
shall return EOF and set errno to indicate the error.
ERRORS
The fclose() function shall fail if:
EAGAIN The O_NONBLOCK flag is set for the file descriptor underlying
stream and the process would be delayed in the write operation.
EBADF The file descriptor underlying stream is not valid.
EFBIG An attempt was made to write a file that exceeds the maximum
file size.
EFBIG An attempt was made to write a file that exceeds the process’
file size limit.
EFBIG The file is a regular file and an attempt was made to write at
or beyond the offset maximum associated with the corresponding
stream.
EINTR The fclose() function was interrupted by a signal.
EIO The process is a member of a background process group attempting
to write to its controlling terminal, TOSTOP is set, the process
is neither ignoring nor blocking SIGTTOU, and the process group
of the process is orphaned. This error may also be returned
under implementation-defined conditions.
ENOSPC There was no free space remaining on the device containing the
file.
EPIPE An attempt is made to write to a pipe or FIFO that is not open
for reading by any process. A SIGPIPE signal shall also be sent
to the thread.
The fclose() function may fail if:
ENXIO A request was made of a nonexistent device, or the request was
outside the capabilities of the device.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
close() , fopen() , getrlimit() , ulimit() , the Base Definitions
volume of IEEE Std 1003.1-2001, <stdio.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .