fflush() -- flush stream

SYNOPSIS

#include <stdio.h>

int fflush(FILE *stream);

The fflush() function causes any buffered output data for stream to be written to file. If any data is written, the file's associated st_mtime and st_ctime values are marked for update. The stream remains open.

If stream is a null pointer when calling fflush(), all streams opened for writing or update are flushed.

PARAMETERS

stream: This parameter is either a null pointer or is a pointer to a stream opened for writing or update.

RETURN VALUES

If successful, the fflush() function returns a value of zero. On failure, it returns EOF and sets errno as follows:

EACCES: Another process has the file locked.
EBADF: stream is not a valid stream opened for writing.
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: A signal interrupted the call.
EIO: An output error occurred.
ENOMEM: Memory could not be allocated for internal buffers.
ENOSPC: An attempt is made to write to a full disk.
ENXIO: A device error occurred.
EPIPE: A write to a closed pipe was attempted.

CONFORMANCE

ANSI/ISO 9899-1990.

MULTITHREAD SAFETY LEVEL

MT-Safe.

PORTING ISSUES

Some varieties of UNIX allow fflush() on an input stream.

AVAILABILITY

PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition

fflush()
flush stream

Function