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-rw-r--r--ext/io/wait/lib/nonblock.rb23
1 files changed, 23 insertions, 0 deletions
diff --git a/ext/io/wait/lib/nonblock.rb b/ext/io/wait/lib/nonblock.rb
new file mode 100644
index 0000000000..46511fb40c
--- /dev/null
+++ b/ext/io/wait/lib/nonblock.rb
@@ -0,0 +1,23 @@
+require "fcntl"
+class IO
+ def nonblock?
+ (fcntl(Fcntl::F_GETFL) & File::NONBLOCK) != 0
+ end
+
+ def nonblock=(nb)
+ f = fcntl(Fcntl::F_GETFL)
+ if nb
+ f |= File::NONBLOCK
+ else
+ f &= ~File::NONBLOCK
+ end
+ fcntl(Fcntl::F_SETFL, f)
+ end
+
+ def nonblock(nb = true)
+ nb, self.nonblock = nonblock?, nb
+ yield
+ ensure
+ self.nonblock = nb
+ end
+end