From e457e68ac42c85ee7e34951d5ff8d022f51fa82f Mon Sep 17 00:00:00 2001
From: Ben Pfaff <blp@nicira.com>
Date: Thu, 9 Apr 2009 15:20:06 -0700
Subject: [PATCH] vswitch: Add unixctl command to reload configuration file
 synchronously.

The Xen interface-reconfigure script wants to tell vswitchd to reload
its configuration and wait until it is complete.  Until now there has
been no way to do this: sending SIGHUP causes a reload, but there is no
way to tell when it is complete.  Now "vlogconf -t <socket> -e
vswitchd/reload" does the job.
---
 vswitchd/etc/init.d/vswitch |  4 +++-
 vswitchd/vswitchd.c         | 25 +++++++++++++++++++++++--
 2 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/vswitchd/etc/init.d/vswitch b/vswitchd/etc/init.d/vswitch
index 3f0b2ece..c6614721 100755
--- a/vswitchd/etc/init.d/vswitch
+++ b/vswitchd/etc/init.d/vswitch
@@ -143,7 +143,9 @@ case "$1" in
         ;;
     reload)
         if [ -f "$VSWITCHD_PIDFILE" ]; then
-            kill -HUP $(cat "$VSWITCHD_PIDFILE")
+            "$VSWITCH_BASE"/bin/vlogconf \
+                --target=vswitchd.$(cat "$VSWITCHD_PIDFILE").ctl \
+                --execute=vswitchd/reload
         fi
         ;;
     strace)
diff --git a/vswitchd/vswitchd.c b/vswitchd/vswitchd.c
index e5cedcb9..f3049b02 100644
--- a/vswitchd/vswitchd.c
+++ b/vswitchd/vswitchd.c
@@ -59,15 +59,17 @@
 
 static void parse_options(int argc, char *argv[]);
 static void usage(void) NO_RETURN;
+static void reload(struct unixctl_conn *, const char *args);
 
-char *config_file;
+static bool need_reconfigure;
+static struct unixctl_conn **conns;
+static size_t n_conns;
 
 int
 main(int argc, char *argv[])
 {
     struct unixctl_server *unixctl;
     struct signal *sighup;
-    bool need_reconfigure;
     int retval;
 
     set_program_name(argv[0]);
@@ -86,6 +88,7 @@ main(int argc, char *argv[])
     if (retval) {
         ofp_fatal(retval, "could not listen for control connections");
     }
+    unixctl_command_register("vswitchd/reload", reload);
 
     cfg_read();
     mgmt_init();
@@ -116,13 +119,30 @@ main(int argc, char *argv[])
     return 0;
 }
 
+static void
+reload(struct unixctl_conn *conn, const char *args UNUSED)
+{
+    need_reconfigure = true;
+    conns = xrealloc(conns, sizeof *conns * (n_conns + 1));
+    conns[n_conns++] = conn;
+}
+
 void
 reconfigure(void)
 {
+    size_t i;
+
     cfg_read();
     bridge_reconfigure();
     mgmt_reconfigure();
     port_reconfigure();
+
+    for (i = 0; i < n_conns; i++) {
+        unixctl_command_reply(conns[i], 202, NULL);
+    }
+    free(conns);
+    conns = NULL;
+    n_conns = 0;
 }
 
 static void
@@ -146,6 +166,7 @@ parse_options(int argc, char *argv[])
         {0, 0, 0, 0},
     };
     char *short_options = long_options_to_short_options(long_options);
+    const char *config_file;
     int error;
 
     for (;;) {
-- 
2.30.2