daemon: new option --detach to run git-daemon in background

Signed-off-by: Matthias Lederhofer <matled@gmx.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/daemon.c b/daemon.c
index cdc42668633ec5a7b93544cca3fc92298d8556f4..e4ec676301c965e0b0ec81995f4e1fb77363c373 100644 (file)
--- a/daemon.c
+++ b/daemon.c
@@ -674,6 +674,24 @@ static void sanitize_stdfds(void)
                close(fd);
 }
 
+static void daemonize(void)
+{
+       switch (fork()) {
+               case 0:
+                       break;
+               case -1:
+                       die("fork failed: %s", strerror(errno));
+               default:
+                       exit(0);
+       }
+       if (setsid() == -1)
+               die("setsid failed: %s", strerror(errno));
+       close(0);
+       close(1);
+       close(2);
+       sanitize_stdfds();
+}
+
 static void store_pid(const char *path)
 {
        FILE *f = fopen(path, "w");
@@ -699,6 +717,7 @@ int main(int argc, char **argv)
        int port = DEFAULT_GIT_PORT;
        int inetd_mode = 0;
        const char *pid_file = NULL;
+       int detach = 0;
        int i;
 
        /* Without this we cannot rely on waitpid() to tell
@@ -767,6 +786,11 @@ int main(int argc, char **argv)
                        pid_file = arg + 11;
                        continue;
                }
+               if (!strcmp(arg, "--detach")) {
+                       detach = 1;
+                       log_syslog = 1;
+                       continue;
+               }
                if (!strcmp(arg, "--")) {
                        ok_paths = &argv[i+1];
                        break;
@@ -799,7 +823,10 @@ int main(int argc, char **argv)
                return execute(peer);
        }
 
-       sanitize_stdfds();
+       if (detach)
+               daemonize();
+       else
+               sanitize_stdfds();
 
        if (pid_file)
                store_pid(pid_file);