2004-11-03 13:51:07 +00:00
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.\" Copyright (C) 2001 Andries Brouwer <aeb@cwi.nl>.
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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2007-04-12 22:42:49 +00:00
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.\"
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2004-11-03 13:51:07 +00:00
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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2007-04-12 22:42:49 +00:00
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.\"
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2004-11-03 13:51:07 +00:00
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.TH FPURGE 3 2001-12-15 "" "Linux Programmer's Manual"
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.SH NAME
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fpurge, __fpurge \- purge a stream
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.SH SYNOPSIS
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.nf
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/* unsupported */
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.B #include <stdio.h>
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.sp
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.BI "int fpurge(FILE *" stream );
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.sp
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/* supported */
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.B #include <stdio.h>
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.br
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.B #include <stdio_ext.h>
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.sp
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.BI "void __fpurge(FILE *" stream );
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.fi
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.SH DESCRIPTION
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The function
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.BR fpurge ()
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clears the buffers of the given 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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2007-05-12 12:58:31 +00:00
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this includes any text pushed back via
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.BR ungetc (3).
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See also
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2004-11-03 13:51:07 +00:00
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.BR fflush (3).
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.LP
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The function
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.BR __fpurge ()
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does precisely the same, but without returning a value.
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.SH "RETURN VALUE"
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Upon successful completion
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.BR fpurge ()
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2004-11-03 13:51:07 +00:00
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returns 0.
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On error, it returns \-1 and sets
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.I errno
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appropriately.
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.SH ERRORS
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.TP
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.B EBADF
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.I stream
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is not an open stream.
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.SH "CONFORMING TO"
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2007-12-25 22:02:19 +00:00
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These functions are non-standard and not portable.
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2004-11-03 13:51:07 +00:00
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The function
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2005-11-02 11:34:24 +00:00
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.BR fpurge ()
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2005-07-18 15:05:56 +00:00
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was introduced in 4.4BSD and is not available under Linux.
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2004-11-03 13:51:07 +00:00
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The function
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2005-11-02 11:34:24 +00:00
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.BR __fpurge ()
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2004-11-03 13:51:07 +00:00
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was introduced in Solaris, and is present in glibc 2.1.95 and later.
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.SH NOTES
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Usually it is a mistake to want to discard input buffers.
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.SH "SEE ALSO"
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2007-06-02 13:06:33 +00:00
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.\" .BR fclean (3),
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2004-11-03 13:51:07 +00:00
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.BR fflush (3),
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.BR setbuf (3),
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.BR stdio_ext (3)
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