Implemented portable daemonize function for win and mac

Author: kala13x

src/sys/sig.c

@@ -65,6 +65,35 @@ void XUtils_ErrExit(const char * pFmt, ...)
     exit(EXIT_FAILURE);
 }
 
+int XUtils_Daemonize(int bNoChdir, int bNoClose)
+{
+#ifdef __linux__
+    return daemon(bNoChdir, bNoClose);
+#else
+    pid_t pid = fork();
+    if (pid < 0) return -1;
+    if (pid > 0) exit(0); // parent exits
+
+    if (setsid() < 0) return -1;
+
+    pid = fork();
+    if (pid < 0) return -1;
+    if (pid > 0) exit(0);
+
+    umask(0);
+    if (!bNoChdir) chdir("/");
+
+    if (!bNoClose)
+    {
+        freopen("/dev/null", "r", stdin);
+        freopen("/dev/null", "w", stdout);
+        freopen("/dev/null", "w", stderr);
+    }
+#endif
+
+    return 0;
+}
+
 void XSig_Callback(int nSig)
 {
     /* Handle signals */

src/sys/sig.h

@@ -21,6 +21,7 @@ typedef void(*xsig_cb_t)(int);
 
 void XUtils_Backtrace(void);
 void XUtils_ErrExit(const char *pFmt, ...);
+int XUtils_Daemonize(int bNoChdir, int bNoClose);
 
 #define errex(...) XUtils_ErrExit(XLOG_THROW_LOCATION __VA_ARGS__)
 

src/xver.h

@@ -12,7 +12,7 @@
 
 #define XUTILS_VERSION_MAX     2
 #define XUTILS_VERSION_MIN     6
-#define XUTILS_BUILD_NUMBER    44
+#define XUTILS_BUILD_NUMBER    45
 
 #ifdef __cplusplus
 extern "C" {

tools/xtop.c

@@ -1597,7 +1597,7 @@ int main(int argc, char *argv[])
         return XSTDERR;
     }
 
-    if (args.bDaemon && daemon(XTRUE, XTRUE) < 0)
+    if (args.bDaemon && XUtils_Daemonize(XTRUE, XTRUE) < 0)
     {
         xlogn("Failed to run server as daemon: %d", errno);
         return XSTDERR;