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108 lines
3.4 KiB
Groff
108 lines
3.4 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Chris Torek and the American National Standards Committee X3,
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.\" on Information Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)fflush.3 8.1 (Berkeley) 6/4/93
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.\"
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.TH FFLUSH 3 "15 September 1997" GNO "Library Routines"
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.SH NAME
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.BR fflush ,
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.BR fpurge
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\- flush a stream
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.SH SYNOPSIS
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#include <stdio.h>
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.sp 1
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int \fBfflush\fR (FILE *\fIstream\fR);
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.br
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int \fBfpurge\fR (FILE *\fIstream\fR);
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.SH DESCRIPTION
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The function
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.BR fflush
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forces a write of all buffered data for the given output or update
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.I stream
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via the stream's underlying write function.
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The open status of the stream is unaffected.
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.LP
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If the
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.I stream
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argument is
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.BR NULL ,
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.BR fflush
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flushes
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.IR all
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open output streams.
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.LP
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The function
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.BR fpurge
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erases any input or output buffered in the given
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.IR stream .
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For output streams this discards any unwritten output.
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For input streams this discards any input read from the underlying object
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but not yet obtained via
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.BR getc (3);
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this includes any text pushed back via
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.BR ungetc .
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.SH RETURN VALUES
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Upon successful completion 0 is returned.
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Otherwise,
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.BR EOF
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is returned and the global variable
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.IR errno
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is set to indicate the error.
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.SH ERRORS
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.RS
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.IP \fBEBADF\fR
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.I Stream
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is not an open stream, or, in the case of
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.BR fflush ,
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not a stream open for writing.
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.RE
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.LP
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The function
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.BR fflush
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may also fail and set
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.IR errno
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for any of the errors specified for the routine
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.BR write (2).
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.SH SEE ALSO
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.BR write (2),
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.BR fopen (3),
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.BR fclose (3),
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.BR setbuf (3)
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.SH STANDARDS
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The
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.BR fflush
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function
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conforms to ANSI/C.
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