FPURGE(3) Linux Programmer's Manual FPURGE(3)NAME
fpurge, __fpurge - purge a stream
SYNOPSIS
/* unsupported */
#include <stdio.h>
int fpurge(FILE *stream);
/* supported */
#include <stdio.h>
#include <stdio_ext.h>
void __fpurge(FILE *stream);
DESCRIPTION
The function fpurge() clears the buffers of the given stream. For out‐
put 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(3). See
also fflush(3).
The function __fpurge() does precisely the same, but without returning
a value.
RETURN VALUE
Upon successful completion fpurge() returns 0. On error, it returns -1
and sets errno appropriately.
ERRORS
EBADF stream is not an open stream.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
┌───────────┬───────────────┬─────────────────────┐
│Interface │ Attribute │ Value │
├───────────┼───────────────┼─────────────────────┤
│__fpurge() │ Thread safety │ MT-Safe race:stream │
└───────────┴───────────────┴─────────────────────┘
CONFORMING TO
These functions are nonstandard and not portable. The function
fpurge() was introduced in 4.4BSD and is not available under Linux.
The function __fpurge() was introduced in Solaris, and is present in
glibc 2.1.95 and later.
NOTES
Usually it is a mistake to want to discard input buffers.
SEE ALSOfflush(3), setbuf(3), stdio_ext(3)COLOPHON
This page is part of release 4.14 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
2017-09-15 FPURGE(3)
