Cleanup patches from Rune Magnussen

software/daemon.c

@@ -1,13 +1,15 @@
 // Functions used when running in the background
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <errno.h>
 #include <unistd.h>
 
 #include "infnoise.h"
 
-bool writePid(int32_t pid, char *fileName) {
+// Write af PID in a file
+static bool writePid(int32_t pid, char *fileName) {
     FILE *pidFile;
     int ret;
     pidFile = fopen(fileName,"w");
@@ -21,3 +23,31 @@ bool writePid(int32_t pid, char *fileName) {
     fclose(pidFile);
     return true;
 }
+
+void startDaemon(bool daemon, bool pidFile, char *fileName) {
+	if(!daemon) {
+		// No backgrounding, optionslly write current PID
+		if(pidFile) {
+			writePid(getpid(), fileName);
+		}
+		return;
+	}
+	int32_t pid = fork();
+	if(pid < 0) {
+		fputs("fork() failed\n", stderr);
+		exit(1);
+	} else if(pid > 0) {
+		// Parent
+		if(pidFile) {
+			if(!writePid(pid, fileName)) {
+				exit(1);
+			}
+		}
+		exit(0);
+	}
+	// Child
+}
+
+bool isSuperUser(void) {
+	return (geteuid() == 0);
+}