Add libuv examples

README.md

@@ -1,11 +1,14 @@
-fimuni-c-cpp-examples
-=====================
+FI MUNI - C and C++ examples
+============================
 
 Examples related to talks at FI MUNI.
+Georgik's blog: http://georgik.sinusgear.com
 
 Allegro
 -------
 
+Allegro is library for interactive applications like games written in C.
+
 Three examples for Allegro 5.0 library.
 - example-01 - display smiley
 - example-02 - display smiley when pressed space
@@ -25,6 +28,9 @@ How to run:
 GTK+
 ----
 
+GTK+ is library for GUI applications written in C. 
+It has also bindings for many other languages.
+
 Helloworld example from http://en.wikipedia.org/wiki/Gtk.
 Requires: GTK+-3
 Package for Debian: libgtk-3-dev
@@ -34,3 +40,27 @@ How to run:
     cd gtk
     make
     ./helloworld
+
+uv
+--
+
+libuv is library which has support for event loops, networking and many other
+features required by cloud computing. This library is core part of Node.js.
+
+Requires: libuv (part of Node.js)
+Package for Debian: none, you need to build it from sources. You can use Node.js package.
+
+How to run hello example:
+
+    cd libuv/hello
+    make
+    ./hello
+
+How to run echo_server example:
+
+    cd libuv/echo_server
+    make
+    ./echo_server
+
+Note: Do not forget to set LD_LIBRARY_PATH so the linker will be able to locate libuv
+ E.g.: export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib

libuv/echo_server/Makefile

@@ -0,0 +1,13 @@
+PACKAGE = echo_server
+OBJECTS = echo_server.o
+CFLAGS 	= -I/usr/local/include/uv
+LDADD	= -luv
+
+hello: $(OBJECTS)
+	${CC} -o ${PACKAGE} ${OBJECTS} ${LDADD}
+
+.c.o:
+	${CC} ${CFLAGS} -c $<
+
+clean:
+	rm -f hello *.o

libuv/echo_server/echo_server.c

@@ -0,0 +1,59 @@
+#include <uv.h>
+#include <stdio.h>
+
+uv_loop_t *loop;
+
+uv_buf_t alloc_buffer(uv_handle_t *handle, size_t suggested_size) {
+    return uv_buf_init((char*) malloc(suggested_size), suggested_size);
+}
+
+static void close_cb(uv_handle_t* handle) {
+  printf("Connection closed\n");
+}
+
+void echo_read(uv_stream_t* tcp, ssize_t nread, uv_buf_t buf) {
+  uv_err_t err = uv_last_error(uv_default_loop());
+
+  if (nread > 0) {
+	  printf("%.*s", nread, buf.base);
+  } else if (nread < 0) {
+    if (err.code == UV_EOF) {
+      uv_close((uv_handle_t*)tcp, close_cb);
+    }
+  }
+}
+
+void on_new_connection(uv_stream_t *server, int status) {
+	uv_tcp_t *client;
+    if (status == -1) {
+        // error!
+        return;
+    }
+
+    client = (uv_tcp_t*) malloc(sizeof(uv_tcp_t));
+    uv_tcp_init(loop, client);
+    if (uv_accept(server, (uv_stream_t*) client) == 0) {
+        uv_read_start((uv_stream_t*) client, alloc_buffer, echo_read);
+    }
+    else {
+        uv_close((uv_handle_t*) client, NULL);
+    }
+}
+
+int main() {
+
+    uv_tcp_t server;
+	int r;
+	struct sockaddr_in bind_addr;
+	loop = uv_default_loop();
+    uv_tcp_init(loop, &server);
+
+    bind_addr = uv_ip4_addr("0.0.0.0", 7000);
+    uv_tcp_bind(&server, bind_addr);
+    r = uv_listen((uv_stream_t*) &server, 128, on_new_connection);
+    if (r) {
+        fprintf(stderr, "Listen error %s\n", uv_err_name(uv_last_error(loop)));
+        return 1;
+    }
+    return uv_run(loop);
+}

libuv/hello/Makefile

@@ -0,0 +1,13 @@
+PACKAGE = hello
+OBJECTS = hello.o
+CFLAGS 	= -I/usr/local/include/uv
+LDADD	= -luv
+
+hello: $(OBJECTS)
+	${CC} -o ${PACKAGE} ${OBJECTS} ${LDADD}
+
+.c.o:
+	${CC} ${CFLAGS} -c $<
+
+clean:
+	rm -f hello *.o

libuv/hello/hello.c

@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <uv.h>
+
+int main() {
+    uv_loop_t *loop = uv_loop_new();
+
+    printf("Now quitting.\n");
+    uv_run(loop);
+
+    return 0;
+}