Add logrotate sample

samples/logrotate/Makefile

@@ -0,0 +1,4 @@
+
+all:
+	$(CXX) ../../src/easylogging++.cc main.cpp -o logrotate-sample -DELPP_DEBUG_INFO --std=c++11
+

samples/logrotate/main.cpp

@@ -0,0 +1,75 @@
+#include "../../src/easylogging++.h"
+#include <stdio.h>
+#include <iostream>
+
+INITIALIZE_EASYLOGGINGPP
+
+/*
+ * Send SIGHUP to the application and log is
+ * reopended
+ * 
+ * Ex:
+ * $ ls -l   logfile.log
+ * -rw-r--r--  1 el  staff  200 Dec  8 10:29 logfile.log
+ * $ rm logfile.log
+ * $ kill -SIGHUP $(pgrep logrotate-sample)
+ * $ ls -l   logfile.log
+ * -rw-r--r--  1 el  staff  0 Dec  8 10:33 logfile.log
+ *
+ * */
+
+#define loggerName "rotate-logger"
+
+void configure_logger()
+{
+    el::Configurations logConf;
+    logConf.setToDefault();
+    logConf.setGlobally(el::ConfigurationType::ToStandardOutput,
+                            "false");
+    logConf.setGlobally(el::ConfigurationType::ToFile, "true");
+    logConf.setGlobally(el::ConfigurationType::Filename, "logfile.log");
+
+    logConf.set(el::Level::Debug, el::ConfigurationType::Enabled, "true");
+    logConf.set(el::Level::Debug,
+                el::ConfigurationType::Format,
+                "%datetime %level %msg");
+    el::Logger* logger = el::Loggers::getLogger(loggerName);
+    el::Loggers::reconfigureLogger(logger, logConf);
+
+}
+
+void handler_hup(int signal)
+{
+    LOG(INFO) << "SIGHUP received - reconfigure logger";
+    el::Logger* logger = el::Loggers::getLogger(loggerName);
+    logger->reconfigure();
+}
+
+void handler_usr1(int signal)
+{
+    LOG(INFO) << "SIGUSR1 received - unregister logger";
+    el::Loggers::unregisterLogger(loggerName);
+}
+
+int main()
+{
+    std::signal(SIGHUP, handler_hup);
+    std::signal(SIGUSR1, handler_usr1);
+
+    LOG(INFO) << "Configuring logger";
+    configure_logger();
+
+    char c;
+    c = getchar();
+    CLOG(DEBUG, loggerName) << "My logger";
+
+    while ((c = getchar()) != 'q')
+    {
+        CLOG(DEBUG, loggerName) << "My logger";
+    }
+
+    std::cout << "Unregistred my logger\n";
+
+    return 0;
+}
+