FPURGE(3) Linux Programmer s Manual FPURGE(3)
NAME fpurge, __fpurge - purge a stream
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(). 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 appropriately.
ERRORS EBADF stream is not an open stream.
CONFORMING TO 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 fclean(3), fflush(3), setbuf(3), stdio_ext(3)