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 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(). See also
The function __fpurge() does precisely the same, but without returning
Upon successful completion fpurge() returns 0. On error, it returns -1
and sets errno appropriately.
EBADF stream is not an open stream.
These 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.
Usually it is a mistake to want to discard input buffers.
fclean(3), fflush(3), setbuf(3), stdio_ext(3)