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 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'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 5.11							    1 Nov 2003								fflush(3C)