fpurge(3) Library Functions Manual fpurge(3)
NAME
fpurge, __fpurge - purge a stream
LIBRARY
Standard C library (libc, -lc)
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 to indicate the error.
ERRORS
EBADF stream is not an open stream.
ATTRIBUTES
For an explanation of the terms used in this section, see at-
tributes(7).
┌────────────────────────────────┬───────────────┬─────────────────────┐
│Interface │ Attribute │ Value │
├────────────────────────────────┼───────────────┼─────────────────────┤
│__fpurge() │ Thread safety │ MT-Safe race:stream │
└────────────────────────────────┴───────────────┴─────────────────────┘
STANDARDS
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 ALSO
fflush(3), setbuf(3), stdio_ext(3)
Linux man-pages 6.03 2022-12-15 fpurge(3)
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