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[linuxjm/LDP_man-pages.git] / original / man3 / fpurge.3

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-.\" Copyright (C) 2001 Andries Brouwer <aeb@cwi.nl>.
-.\"
-.\" %%%LICENSE_START(VERBATIM)
-.\" Permission is granted to make and distribute verbatim copies of this
-.\" manual provided the copyright notice and this permission notice are
-.\" preserved on all copies.
-.\"
-.\" Permission is granted to copy and distribute modified versions of this
-.\" manual under the conditions for verbatim copying, provided that the
-.\" entire resulting derived work is distributed under the terms of a
-.\" permission notice identical to this one.
-.\"
-.\" Since the Linux kernel and libraries are constantly changing, this
-.\" manual page may be incorrect or out-of-date.  The author(s) assume no
-.\" responsibility for errors or omissions, or for damages resulting from
-.\" the use of the information contained herein.  The author(s) may not
-.\" have taken the same level of care in the production of this manual,
-.\" which is licensed free of charge, as they might when working
-.\" professionally.
-.\"
-.\" Formatted or processed versions of this manual, if unaccompanied by
-.\" the source, must acknowledge the copyright and authors of this work.
-.\" %%%LICENSE_END
-.\"
-.TH FPURGE 3  2001-12-15 "" "Linux Programmer's Manual"
-.SH NAME
-fpurge, __fpurge \- purge a stream
-.SH SYNOPSIS
-.nf
-/* unsupported */
-.B #include <stdio.h>
-.sp
-.BI "int fpurge(FILE *" stream );
-.sp
-/* supported */
-.B #include <stdio.h>
-.br
-.B #include <stdio_ext.h>
-.sp
-.BI "void  __fpurge(FILE *" stream );
-.fi
-.SH DESCRIPTION
-The function
-.BR fpurge ()
-clears the buffers of 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
-.BR getc (3);
-this includes any text pushed back via
-.BR ungetc (3).
-See also
-.BR fflush (3).
-.LP
-The function
-.BR __fpurge ()
-does precisely the same, but without returning a value.
-.SH RETURN VALUE
-Upon successful completion
-.BR fpurge ()
-returns 0.
-On error, it returns \-1 and sets
-.I errno
-appropriately.
-.SH ERRORS
-.TP
-.B EBADF
-.I stream
-is not an open stream.
-.SH CONFORMING TO
-These functions are nonstandard and not portable.
-The function
-.BR fpurge ()
-was introduced in 4.4BSD and is not available under Linux.
-The function
-.BR __fpurge ()
-was introduced in Solaris, and is present in glibc 2.1.95 and later.
-.SH NOTES
-Usually it is a mistake to want to discard input buffers.
-.SH SEE ALSO
-.\" .BR fclean (3),
-.BR fflush (3),
-.BR setbuf (3),
-.BR stdio_ext (3)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.