fflush(3C)						   Standard C Library Functions 						fflush(3C)

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 points to an input stream or an update stream into which the most recent operation was input, that stream is  flushed	if  it	is
       seekable  and  is  not already at end-of-file.  Flushing an input stream discards any buffered input and adjusts the file pointer such that
       the next input operation accesses the byte after the last one read.  A stream is seekable if the underlying  file  is  not  a  pipe,  FIFO,
       socket, or TTY device.

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

       An input stream, seekable or non-seekable, can be flushed by explicitly calling fflush() with a non-null argument specifying that stream.

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 opera-
		       tion.

       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's file size limit; or 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 calling 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:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

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

SunOS 5.10							    1 Nov 2003								fflush(3C)