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
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 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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