__fpurge(3) -- Linux man page
NAMEfpurge, __fpurge - purge a stream
/* unsupported */ #include <stdio.h> int fpurge(FILE *stream); /* supported */ #include <stdio.h>
#include <stdio_ext.h> void __fpurge(FILE *stream);
DESCRIPTIONThe 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(). See also fflush(3).
RETURN VALUEUpon successful completion fpurge() returns 0. On error, it returns -1 and sets errno appropriately.
- stream is not an open stream.
CONFORMING TOThese functions are nonstandard and not portable. The function fpurge() was introduced in BSD 4.4 and is not available under Linux. The function __fpurge() was introduced in Solaris, and is present in glibc 2.1.95 and later.
NOTESUsually it is a mistake to want to discard input buffers.
SEE ALSOfclean(3), fflush(3), setbuf(3), stdio_ext(3)