| Class | IO |
| In: |
io/wait/lib/nonblock.rb
|
# File io/wait/lib/nonblock.rb, line 17 def nonblock(nb = true) nb, self.nonblock = nonblock?, nb yield ensure self.nonblock = nb end
# File io/wait/lib/nonblock.rb, line 7 def nonblock=(nb) f = fcntl(Fcntl::F_GETFL) if nb f |= File::NONBLOCK else f &= ~File::NONBLOCK end fcntl(Fcntl::F_SETFL, f) end
# File io/wait/lib/nonblock.rb, line 3 def nonblock? (fcntl(Fcntl::F_GETFL) & File::NONBLOCK) != 0 end
— IO#ready?
returns non-nil if input available without blocking, or nil.
/*
=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;
ioctl_arg n;
GetOpenFile(io, fptr);
rb_io_check_readable(fptr);
if (!FIONREAD_POSSIBLE_P(fileno(fptr->f))) return Qfalse;
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 ioctl_arg2num(n);
return Qnil;
}
— IO#wait([timeout])
waits until input available or timed out and returns self, or nil
when EOF reached.
/*
=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;
ioctl_arg 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 (!FIONREAD_POSSIBLE_P(fileno(fptr->f))) return Qfalse;
if (ioctl(fileno(fp), FIONREAD, &n)) rb_sys_fail(0);
if (n > 0) return io;
return Qnil;
}