* ext/io/nonblock/nonblock.c: [DOC] Document io/nonblock by reprah

[Fixes GH-418] https://github.com/ruby/ruby/pull/418 based on the
  original discussion from documenting-ruby/ruby#18


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43314 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Thu Oct 17 05:52:31 2013  Zachary Scott  <e@zzak.io>
+
+	* ext/io/nonblock/nonblock.c: [DOC] Document io/nonblock by reprah
+	  [Fixes GH-418] https://github.com/ruby/ruby/pull/418 based on the
+	  original discussion from documenting-ruby/ruby#18
+
 Thu Oct 17 05:40:33 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c (objspace_each_objects): do not skip empty RVALUEs.

ext/io/nonblock/nonblock.c

@@ -30,6 +30,12 @@ io_nonblock_mode(int fd)
 #endif
 
 #ifdef F_GETFL
+/*
+ * call-seq:
+ *   io.nonblock? -> boolean
+ *
+ * Returns +true+ if an IO object is in non-blocking mode.
+ */
 static VALUE
 rb_io_nonblock_p(VALUE io)
 {
@@ -61,6 +67,13 @@ io_nonblock_set(int fd, int f, int nb)
 	rb_sys_fail(0);
 }
 
+/*
+ * call-seq:
+ *   io.nonblock = boolean -> boolean
+ *
+ * Enables non-blocking mode on a stream when set to
+ * +true+, and blocking mode when set to +false+.
+ */
 static VALUE
 rb_io_nonblock_set(VALUE io, VALUE nb)
 {
@@ -79,6 +92,16 @@ io_nonblock_restore(VALUE arg)
     return Qnil;
 }
 
+/*
+ * call-seq:
+ *   io.nonblock {|io| } -> io
+ *   io.nonblock(boolean) {|io| } -> io
+ *
+ * Yields +self+ in non-blocking mode.
+ *
+ * When +false+ is given as an argument, +self+ is yielded in blocking mode.
+ * The original mode is restored after the block is executed.
+ */
 static VALUE
 rb_io_nonblock_block(int argc, VALUE *argv, VALUE io)
 {