0.0.1 release - a proper daemon

Author: marttcw

README.md

@@ -49,3 +49,8 @@ newappid 244630 "NEOTOKYO" 0
 newappid 282440 "Quake Live" 100
 ```
 
+## Releases
+### 0.0.1 Alpha release
+* First release
+* Basic daemon implementation implemented
+

meson.build

@@ -1,7 +1,7 @@
 project('steamcountsnotifyd'
   , 'cpp'
   , default_options : ['warning_level=3', 'cpp_std=c++17', 'optimization=3', 'werror=false']
-  , version : 'PRE-ALPHA 20190911'
+  , version : '0.0.1'
 )
 
 cc = meson.get_compiler('cpp')
@@ -32,6 +32,7 @@ src = [
   , './src/tool/getPlayerCount.cpp'
   , './src/tool/homeDirectory.cpp'
   , './src/wrapper/curl.cpp'
+  , './src/wrapper/daemon.cpp'
   , './src/wrapper/notify.cpp'
 ]
 

src/core/help.h

@@ -16,6 +16,6 @@
   "steamcountsnotifyd\n"\
   "The Steam player count notification daemon\n"\
   "\n"\
-  "Version Pre-Alpha 2019-09-08\n"
+  "0.0.1 - Alpha Release\n"
 
 #endif

src/main.cpp

@@ -35,6 +35,8 @@ int main(int argc, char **argv)
   // If help or version message not used (normal execution)
   if (running)
   {
+    wrapper::daemon::init();
+
     //std::function<void(unsigned int, param::appidName_s, const param::config &)> thread::appidRunning;
     wrapper::notify::init("steamcountsnotifyd");
 
@@ -56,6 +58,7 @@ int main(int argc, char **argv)
     }
 
     wrapper::notify::uninit();
+    wrapper::daemon::uninit();
   }
 
   return 0;

src/wrapper/daemon.cpp

@@ -0,0 +1,87 @@
+#include "wrapper/daemon.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <syslog.h>
+
+void signal_handler(int sig)
+{
+  switch (sig)
+  {
+  case SIGHUP:
+    syslog(LOG_NOTICE, "Daemon hangup signal catched");
+    break;
+  case SIGTERM:
+    syslog(LOG_NOTICE, "Daemon terminate signal catched");
+    exit(0);
+    break;
+  }
+}
+
+void wrapper::daemon::init()
+{
+  pid_t pid;
+  pid = fork();   // Fork off parent process
+
+  // Error occurred
+  if (pid < 0)
+  {
+    exit(EXIT_FAILURE);
+  }
+
+  // Success: Let parent terminate
+  if (pid > 0)
+  {
+    exit(EXIT_SUCCESS);
+  }
+
+  // On success: Child process becomes session leader
+  if (setsid() < 0)
+  {
+    exit(EXIT_FAILURE);
+  }
+
+  // Catch, ignore and handle signals
+  signal(SIGCHLD, SIG_IGN);         // Ignore child
+  signal(SIGTSTP, SIG_IGN);         // Ignore tty signals
+  signal(SIGTTOU, SIG_IGN);         // Ignore terminal output
+  signal(SIGTTIN, SIG_IGN);         // Ignore terminal input
+  signal(SIGHUP,  signal_handler);
+  signal(SIGTERM, signal_handler);
+
+  pid = fork();
+
+  // Error occurred
+  if (pid < 0)
+  {
+    exit(EXIT_FAILURE);
+  }
+
+  // Success: Let parent terminate
+  if (pid > 0)
+  {
+    exit(EXIT_SUCCESS);
+  }
+
+  umask(0);
+  chdir("/");
+
+  // Close all open file descriptors
+  int x;
+  for (x = sysconf(_SC_OPEN_MAX); x >= 0; x--)
+  {
+    close(x);
+  }
+
+  // Open logging
+  openlog("steamcountsnotifyd", LOG_PID, LOG_DAEMON);
+}
+
+void wrapper::daemon::uninit()
+{
+  closelog();
+}
+

src/wrapper/daemon.h

@@ -5,7 +5,8 @@ namespace wrapper
 {
   namespace daemon
   {
-
+    void init();
+    void uninit();
   }
 }