1 files changed, 108 insertions, 0 deletions
diff --git a/ext/io/nonblock/nonblock.c b/ext/io/nonblock/nonblock.c
new file mode 100644
index 0000000000..d7e1ac8e01
--- /dev/null
+++ b/ext/io/nonblock/nonblock.c
@@ -0,0 +1,108 @@
+/**********************************************************************
+
+  io/wait.c -
+
+  $Author$
+  created at: Tue Jul 14 21:53:18 2009
+
+  All the files in this distribution are covered under the Ruby's
+  license (see the file COPYING).
+
+**********************************************************************/
+
+#include "ruby.h"
+#include "ruby/io.h"
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <fcntl.h>
+
+#ifdef F_GETFL
+static int
+io_nonblock_mode(int fd)
+{
+    int f = fcntl(fd, F_GETFL);
+    if (f == -1) rb_sys_fail(0);
+    return f;
+}
+#else
+#define io_nonblock_mode(fd) ((void)(fd), 0)
+#endif
+
+#ifdef F_GETFL
+static VALUE
+rb_io_nonblock_p(VALUE io)
+{
+    rb_io_t *fptr;
+    GetOpenFile(io, fptr);
+    if (io_nonblock_mode(fptr->fd) & O_NONBLOCK)
+	return Qtrue;
+    return Qfalse;
+}
+#else
+#define rb_io_nonblock_p rb_f_notimplement
+#endif
+
+#ifdef F_SETFL
+static void
+io_nonblock_set(int fd, int f, int nb)
+{
+    if (nb)
+	f |= O_NONBLOCK;
+    else
+	f &= ~O_NONBLOCK;
+    if (fcntl(fd, F_SETFL, f) == -1)
+	rb_sys_fail(0);
+}
+
+static VALUE
+rb_io_nonblock_set(VALUE io, VALUE nb)
+{
+    rb_io_t *fptr;
+    GetOpenFile(io, fptr);
+    io_nonblock_set(fptr->fd, io_nonblock_mode(fptr->fd), RTEST(nb));
+    return io;
+}
+
+static VALUE
+io_nonblock_restore(VALUE arg)
+{
+    int *restore = (int *)arg;
+    if (fcntl(restore[0], F_SETFL, restore[1]) == -1)
+	rb_sys_fail(0);
+    return Qnil;
+}
+
+static VALUE
+rb_io_nonblock_block(int argc, VALUE *argv, VALUE io)
+{
+    int nb = 1;
+    rb_io_t *fptr;
+    int f, restore[2];
+
+    GetOpenFile(io, fptr);
+    if (argc > 0) {
+	VALUE v;
+	rb_scan_args(argc, argv, "01", &v);
+	nb = RTEST(v);
+    }
+    f = io_nonblock_mode(fptr->fd);
+    restore[0] = fptr->fd;
+    restore[1] = f;
+    io_nonblock_set(fptr->fd, f, nb);
+    return rb_ensure(rb_yield, io, io_nonblock_restore, (VALUE)restore);
+}
+#else
+#define rb_io_nonblock_set rb_f_notimplement
+#define rb_io_nonblock_block rb_f_notimplement
+#endif
+
+void
+Init_nonblock(void)
+{
+    VALUE io = rb_cIO;
+
+    rb_define_method(io, "nonblock?", rb_io_nonblock_p, 0);
+    rb_define_method(io, "nonblock=", rb_io_nonblock_set, 1);
+    rb_define_method(io, "nonblock", rb_io_nonblock_block, -1);
+}