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<TITLE>fflush</TITLE>
<body bgcolor="#ffffcc">
<hr>
<pre>
<h3>FFLUSH(3) Linux Programmer's Manual FFLUSH(3)
</h3>
<h3>NAME
</h3> fflush, fpurge - flush a stream
<h3>SYNOPSIS
</h3> #include <stdio.h>
int fflush( FILE *stream);
int fpurge( FILE *stream);
<h3>DESCRIPTION
</h3> The function fflush forces a write of all buffered data
for the given output or update stream via the stream's
underlying write function. The open status of the stream
is unaffected.
If the stream argument is NULL, fflush flushes all open
output streams. (Does this happen under Linux)
The function fpurge erases any input or output buffered in
the given stream. For output streams this discards any
unwritten output. For input streams this discards any
input read from the underlying object but not yet obtained
via getc(3); this includes any text pushed back via
ungetc.
<h3>RETURN VALUES
</h3> Upon successful completion 0 is returned. Otherwise, EOF
is returned and the global variable errno is set to indi-
cate the error.
<h3>ERRORS
</h3> EBADF Stream is not an open stream, or, in the case of
fflush, not a stream open for writing.
The function fflush may also fail and set errno for any of
the errors specified for the routine write(2).
<h3>BUGS
</h3> Linux may not support fpurge.
</pre>
<hr>
<h3>SEE ALSO
</h3><p>
<a href=write.htm>write</a>,
<a href=fopen.htm>fopen</a>,
<a href=fclose.htm>fclose</a>,
<a href=setbuf.htm>setbuf</a>,
<pre>
<h3>STANDARDS
</h3> The fflush function conforms to ANSI C3.159-1989 (``ANSI
C'').
<h3>BSD MANPAGE 29 November 1993 1
</h3>
</pre>
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