mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
6cdef2dc7e
string. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@14912 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
138 lines
3.1 KiB
C
138 lines
3.1 KiB
C
/**********************************************************************
|
|
|
|
io/wait.c -
|
|
|
|
$Author$
|
|
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>
|
|
#if defined(FIONREAD_HEADER)
|
|
#include FIONREAD_HEADER
|
|
#endif
|
|
|
|
#ifdef HAVE_RB_W32_IOCTLSOCKET
|
|
#define ioctl ioctlsocket
|
|
#define ioctl_arg u_long
|
|
#define ioctl_arg2num(i) ULONG2NUM(i)
|
|
#else
|
|
#define ioctl_arg int
|
|
#define ioctl_arg2num(i) INT2NUM(i)
|
|
#endif
|
|
|
|
#ifdef HAVE_RB_W32_IS_SOCKET
|
|
#define FIONREAD_POSSIBLE_P(fd) rb_w32_is_socket(fd)
|
|
#else
|
|
#define FIONREAD_POSSIBLE_P(fd) ((fd),Qtrue)
|
|
#endif
|
|
|
|
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));
|
|
|
|
/*
|
|
* call-seq:
|
|
* io.ready? -> true, false or nil
|
|
*
|
|
* Returns non-nil if input available without blocking, or nil.
|
|
*/
|
|
|
|
static VALUE
|
|
io_ready_p(VALUE io)
|
|
{
|
|
rb_io_t *fptr;
|
|
ioctl_arg n;
|
|
|
|
GetOpenFile(io, fptr);
|
|
rb_io_check_readable(fptr);
|
|
if (rb_io_read_pending(fptr)) return Qtrue;
|
|
if (!FIONREAD_POSSIBLE_P(fptr->fd)) return Qfalse;
|
|
if (ioctl(fptr->fd, FIONREAD, &n)) rb_sys_fail(0);
|
|
if (n > 0) return ioctl_arg2num(n);
|
|
return Qnil;
|
|
}
|
|
|
|
struct wait_readable_arg {
|
|
rb_fdset_t fds;
|
|
struct timeval *timeout;
|
|
};
|
|
|
|
#ifdef HAVE_RB_FD_INIT
|
|
static VALUE
|
|
wait_readable(VALUE p)
|
|
{
|
|
struct wait_readable_arg *arg = (struct wait_readable_arg *)p;
|
|
rb_fdset_t *fds = &arg->fds;
|
|
|
|
return (VALUE)rb_thread_select(rb_fd_max(fds), rb_fd_ptr(fds), NULL, NULL, arg->timeout);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* call-seq:
|
|
* io.wait -> IO, true, false or nil
|
|
* io.wait(timeout) -> IO, true, false or nil
|
|
*
|
|
* Waits until input is available or times out and returns self or nil when
|
|
* EOF is reached.
|
|
*/
|
|
|
|
static VALUE
|
|
io_wait(int argc, VALUE *argv, VALUE io)
|
|
{
|
|
rb_io_t *fptr;
|
|
struct wait_readable_arg arg;
|
|
int fd, i;
|
|
ioctl_arg n;
|
|
VALUE timeout;
|
|
struct timeval timerec;
|
|
|
|
GetOpenFile(io, fptr);
|
|
rb_io_check_readable(fptr);
|
|
rb_scan_args(argc, argv, "01", &timeout);
|
|
if (NIL_P(timeout)) {
|
|
arg.timeout = 0;
|
|
}
|
|
else {
|
|
timerec = rb_time_interval(timeout);
|
|
arg.timeout = &timerec;
|
|
}
|
|
|
|
if (rb_io_read_pending(fptr)) return Qtrue;
|
|
if (!FIONREAD_POSSIBLE_P(fptr->fd)) return Qfalse;
|
|
fd = fptr->fd;
|
|
rb_fd_init(&arg.fds);
|
|
rb_fd_set(fd, &arg.fds);
|
|
#ifdef HAVE_RB_FD_INIT
|
|
i = (int)rb_ensure(wait_readable, (VALUE)&arg,
|
|
(VALUE (*)_((VALUE)))rb_fd_term, (VALUE)&arg.fds);
|
|
#else
|
|
i = rb_thread_select(fd + 1, rb_fd_ptr(&arg.fds), NULL, NULL, arg.timeout);
|
|
#endif
|
|
if (i < 0)
|
|
rb_sys_fail(0);
|
|
rb_io_check_closed(fptr);
|
|
if (ioctl(fptr->fd, FIONREAD, &n)) rb_sys_fail(0);
|
|
if (n > 0) return io;
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* IO wait methods
|
|
*/
|
|
|
|
void
|
|
Init_wait()
|
|
{
|
|
rb_define_method(rb_cIO, "ready?", io_ready_p, 0);
|
|
rb_define_method(rb_cIO, "wait", io_wait, -1);
|
|
}
|