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/**********************************************************************
io/wait.c -
$Author$
$Date$
created at: Tue Aug 28 09:08:06 JST 2001
All the files in this distribution are covered under the Ruby's
license (see the file COPYING).
**********************************************************************/
#include "ruby.h"
#include "rubyio.h"
#include <sys/types.h>
#include FIONREAD_HEADER
static VALUE io_ready_p _((VALUE io));
static VALUE io_wait _((int argc, VALUE *argv, VALUE io));
void Init_wait _((void));
EXTERN struct timeval rb_time_interval _((VALUE time));
/*
=begin
= IO wait methods.
=end
*/
/*
=begin
--- IO#ready?
returns non-nil if input available without blocking, or nil.
=end
*/
static VALUE
io_ready_p(io)
VALUE io;
{
OpenFile *fptr;
FILE *fp;
int n;
GetOpenFile(io, fptr);
rb_io_check_readable(fptr);
fp = fptr->f;
if (feof(fp)) return Qfalse;
if (rb_read_pending(fp)) return Qtrue;
if (ioctl(fileno(fp), FIONREAD, &n)) rb_sys_fail(0);
if (n > 0) return INT2NUM(n);
return Qnil;
}
/*
=begin
--- IO#wait([timeout])
waits until input available or timed out and returns self, or nil
when EOF reached.
=end
*/
static VALUE
io_wait(argc, argv, io)
int argc;
VALUE *argv;
VALUE io;
{
OpenFile *fptr;
fd_set rd;
FILE *fp;
int fd, n;
VALUE timeout;
struct timeval *tp, timerec;
GetOpenFile(io, fptr);
rb_io_check_readable(fptr);
rb_scan_args(argc, argv, "01", &timeout);
if (NIL_P(timeout)) {
tp = 0;
}
else {
timerec = rb_time_interval(timeout);
tp = &timerec;
}
fp = fptr->f;
if (feof(fp)) return Qfalse;
if (rb_read_pending(fp)) return Qtrue;
fd = fileno(fp);
FD_ZERO(&rd);
FD_SET(fd, &rd);
if (rb_thread_select(fd + 1, &rd, NULL, NULL, tp) < 0)
rb_sys_fail(0);
rb_io_check_closed(fptr);
if (ioctl(fileno(fp), FIONREAD, &n)) rb_sys_fail(0);
if (n > 0) return io;
return Qnil;
}
void
Init_wait()
{
rb_define_method(rb_cIO, "ready?", io_ready_p, 0);
rb_define_method(rb_cIO, "wait", io_wait, -1);
}
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