CentOS 7.0 - man page for __fpurge (centos section 3)
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FPURGE(3) Linux Programmer's Manual FPURGE(3)
fpurge, __fpurge - purge a stream
/* unsupported */
int fpurge(FILE *stream);
/* supported */
void __fpurge(FILE *stream);
The function 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 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.
Upon successful completion fpurge() returns 0. On error, it returns -1 and sets errno
EBADF stream is not an open stream.
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.
Usually it is a mistake to want to discard input buffers.
fflush(3), setbuf(3), stdio_ext(3)
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