1 files changed, 138 insertions, 0 deletions
diff --git a/trunk/ext/io/wait/wait.c b/trunk/ext/io/wait/wait.c
new file mode 100644
index 0000000000..5986f61b39
--- /dev/null
+++ b/trunk/ext/io/wait/wait.c
@@ -0,0 +1,138 @@
+/**********************************************************************
+
+  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) ((void)(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);
+}