fclose(3S) SDK R4.11 fclose(3S)
NAME
fclose, fflush - close or flush a stream
SYNOPSIS
#include <stdio.h>
int fclose (FILE *stream);
int fflush (FILE *stream);
DESCRIPTION
fclose causes any buffered data waiting to be written for the named
stream [see intro(3)] to be written out, and the stream to be closed.
If the underlying file pointer is not already at end of file, and the
file is one capable of seeking, the file pointer is adjusted so that
the next operation on the open file pointer deals with the byte after
the last one read from or written to the file being closed.
fclose is performed automatically for all open files on calling exit.
If stream points to an output stream or an update stream on which the
most recent operation was not input, fflush causes any buffered data
waiting to be written for the named stream to be written to that
file. Any unread data buffered in stream is discarded. The stream
remains open.
When calling fflush, if stream is a null pointer, all files open for
writing are flushed.
Errors
On successful completion these functions return a value of zero.
Otherwise EOF is returned.
Considerations for Threads Programming
+---------+-----------------------------+
| | async- |
|function | reentrant cancel cancel |
| | point safe |
+---------+-----------------------------+
|fclose | Y Y N |
|fflush | Y Y N |
+---------+-----------------------------+
REFERENCES
close(2), exit(2), intro(3), reentrant(3), fopen(3S), setbuf(3S),
stdio(3S)
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