Merge pull request luvit#256 from joerg-krause/master

examples: add pipe echo example

examples/uvbook/pipe-echo-client.lua

@@ -0,0 +1,24 @@
+local uv = require("uv")
+
+local SOCK = "/tmp/echo.sock"
+
+local client = uv.new_pipe(false)
+client:connect(SOCK, function (err)
+  assert(not err, err)
+  client:read_start(function (err, chunk)
+    assert(not err, err)
+    if chunk then
+      print(chunk)
+    else
+      client:close()
+    end
+  end)
+
+  client:write("Hello ")
+  client:write("world!")
+end)
+
+print("CTRL-C to break")
+
+uv.run("default")
+uv.loop_close()

examples/uvbook/pipe-echo-server.lua

@@ -0,0 +1,35 @@
+local uv = require("uv")
+
+local SOCK = "/tmp/echo.sock"
+
+local server = uv.new_pipe(false)
+
+local ret, err, code = server:bind(SOCK)
+-- if file already exists, remove it first and try again
+if not ret and code == "EADDRINUSE" then
+  local fs = require("fs")
+  fs.unlinkSync(SOCK)
+  _, err, _ = server:bind(SOCK)
+  assert(not err, err)
+else
+  assert(not err, err)
+end
+
+server:listen(128, function (err)
+  assert(not err, err)
+  local client = uv.new_pipe(false)
+  server:accept(client)
+  client:read_start(function (err, chunk)
+    assert(not err, err)
+    if chunk then
+      print("Got: " .. chunk)
+      client:write(chunk)
+    else
+      client:shutdown()
+      client:close()
+    end
+  end)
+end)
+
+uv.run("default")
+uv.loop_close()