ovsdb-server: Maintain the database lock with --detach.

[sliver-openvswitch.git] / lib / daemon.c

diff --git a/lib/daemon.c b/lib/daemon.c
index 4ad4af4..0dcc66f 100644 (file)
--- a/lib/daemon.c
+++ b/lib/daemon.c
@@ -23,6 +23,8 @@
 #include <unistd.h>
 #include "fatal-signal.h"
 #include "dirs.h"
+#include "lockfile.h"
+#include "timeval.h"
 #include "util.h"
 
 #define THIS_MODULE VLM_daemon
@@ -35,7 +37,10 @@ static bool detach;
 static char *pidfile;
 
 /* Create pidfile even if one already exists and is locked? */
-static bool force;
+static bool overwrite_pidfile;
+
+/* Should we chdir to "/". */
+static bool chdir_ = true;
 
 /* Returns the file name that would be used for a pidfile if 'name' were
  * provided to set_pidfile().  The caller must free the returned string. */
@@ -69,13 +74,27 @@ get_pidfile(void)
     return pidfile;
 }
 
+/* Sets that we do not chdir to "/". */
+void
+set_no_chdir(void)
+{
+    chdir_ = false;
+}
+
+/* Will we chdir to "/" as part of daemonizing? */
+bool
+is_chdir_enabled(void)
+{
+    return chdir_;
+}
+
 /* Normally, die_if_already_running() will terminate the program with a message
  * if a locked pidfile already exists.  If this function is called,
  * die_if_already_running() will merely log a warning. */
 void
 ignore_existing_pidfile(void)
 {
-    force = true;
+    overwrite_pidfile = true;
 }
 
 /* Sets up a following call to daemonize() to detach from the foreground
@@ -86,6 +105,13 @@ set_detach(void)
     detach = true;
 }
 
+/* Will daemonize() really detach? */
+bool
+get_detach(void)
+{
+    return detach;
+}
+
 /* If a pidfile has been configured and that pidfile already exists and is
  * locked by a running process, returns the pid of the running process.
  * Otherwise, returns 0. */
@@ -117,7 +143,7 @@ die_if_already_running(void)
 {
     pid_t pid = already_running();
     if (pid) {
-        if (!force) {
+        if (!overwrite_pidfile) {
             ovs_fatal(0, "%s: already running as pid %ld",
                       get_pidfile(), (long int) pid);
         } else {
@@ -209,7 +235,11 @@ daemonize(void)
             write(fds[1], &c, 1);
             close(fds[1]);
             setsid();
-            chdir("/");
+            if (chdir_) {
+                chdir("/");
+            }
+            time_postfork();
+            lockfile_postfork();
             break;
 
         case -1:
@@ -227,9 +257,11 @@ daemon_usage(void)
 {
     printf(
         "\nDaemon options:\n"
-        "  -D, --detach            run in background as daemon\n"
-        "  -P, --pidfile[=FILE]    create pidfile (default: %s/%s.pid)\n"
-        "  -f, --force             with -P, start even if already running\n",
+        "  --detach                run in background as daemon\n"
+        "  --no-chdir              do not chdir to '/'\n"
+        "  --pidfile[=FILE]        create pidfile (default: %s/%s.pid)\n"
+        "  --overwrite-pidfile     with --pidfile, start even if already "
+                                   "running\n",
         ovs_rundir, program_name);
 }