+
+/* daemon() - detach process from user and disappear into the background
+ * returns -1 on failure, but you can't do much except exit in that case
+ * since we may already have forked. This is based on the BSD version,
+ * so the caller is responsible for things like the umask, etc.
+ */
+
+/* believed to work on all Posix systems */
+
+int daemon(int nochdir, int noclose)
+{
+ pid_t pid;
+ switch (pid = fork())
+ {
+ case 0: break;
+ case -1: return -1;
+ default: _exit(0); /* exit the original process */
+ }
+
+ if (setsid() < 0) /* shoudn't fail */
+ return -1;
+
+ /* dyke out this switch if you want to acquire a control tty in */
+ /* the future -- not normally advisable for daemons */
+
+ switch (pid = fork())
+ {
+ case 0: break;
+ case -1: return -1;
+ default:
+ ofstream outfile;
+ outfile.open("gameserv.pid");
+ if (outfile.fail())
+ cerr << "Unable to open gameserv.pid" << endl;
+ outfile << pid << endl;
+ outfile.close();
+
+ _exit(0);
+ }
+
+ if (!nochdir)
+ chdir("/");
+
+ if (!noclose)
+ {
+ closeall(0);
+ open("/dev/null",O_RDWR);
+ dup(0); dup(0);
+ }
+
+ return 0;
+}
+
+
+/* closeall() -- close all FDs >= a specified value */
+
+void closeall(int fd)
+{
+ int fdlimit = sysconf(_SC_OPEN_MAX);
+
+ while (fd < fdlimit)
+ close(fd++);
+}
+
+