NAME

fflush − flush a stream

SYNOPSIS

#include <stdio.h>

int fflush(FILE ∗stream);

DESCRIPTION

If stream points to an output stream or an update stream in which the most recent operation was not input, fflush() causes any unwritten data for that stream to be written to the file, and the st_ctime and st_mtime fields of the underlying file are marked for update. 

If stream is a null pointer, fflush() performs this flushing action on all streams for which the behavior is defined above. 

RETURN VALUES

Upon successful completion, fflush() returns 0.  Otherwise, it returns EOF and sets errno to indicate the error. 

ERRORS

The fflush() function will 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 or 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 fflush() 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. 

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 will also be sent to the process. 

The fflush() function may fail if:

ENXIO A request was made of a non-existent device, or the request was beyond the limits of the device. 

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

SEE ALSO

getrlimit(2), ulimit(2), attributes(5)

SunOS 5.6  —  Last change: 30 Dec 1996