ovs-vswitchd: Implement "exit" unixctl command.

This is useful for profiling, since common profilers do not print anything
until the process terminates, and only if the process terminates in the
ordinary way by calling exit().

2 files changed, 18 insertions, 2 deletions

diff --git a/vswitchd/ovs-vswitchd.8.in b/vswitchd/ovs-vswitchd.8.in
index b7c99404..24c1c5d3 100644
--- a/vswitchd/ovs-vswitchd.8.in
+++ b/vswitchd/ovs-vswitchd.8.in
@@ -106,6 +106,9 @@ to be loaded.
 \fBovs\-vswitchd\fR process.  The currently supported commands are
 described below.  The command descriptions assume an understanding of
 how to configure Open vSwitch.
+.SS "GENERAL COMMANDS"
+.IP "\fBexit\fR"
+Causes \fBovs\-vswitchd\fR to gracefully terminate.
 .SS "BRIDGE COMMANDS"
 These commands manage bridges.
 .IP "\fBfdb/show\fR \fIbridge\fR"
diff --git a/vswitchd/ovs-vswitchd.c b/vswitchd/ovs-vswitchd.c
index c1acfc41..64781560 100644
--- a/vswitchd/ovs-vswitchd.c
+++ b/vswitchd/ovs-vswitchd.c
@@ -50,6 +50,8 @@
 #include "vlog.h"
 #define THIS_MODULE VLM_vswitchd
 
+static unixctl_cb_func ovs_vswitchd_exit;
+
 static const char *parse_options(int argc, char *argv[]);
 static void usage(void) NO_RETURN;
 
@@ -61,7 +63,7 @@ main(int argc, char *argv[])
     struct ovsdb_idl *idl;
     const char *remote;
     bool need_reconfigure;
-    bool inited;
+    bool inited, exiting;
     unsigned int idl_seqno;
     int retval;
 
@@ -82,6 +84,7 @@ main(int argc, char *argv[])
     if (retval) {
         exit(EXIT_FAILURE);
     }
+    unixctl_command_register("exit", ovs_vswitchd_exit, &exiting);
 
     daemonize_complete();
 
@@ -90,7 +93,8 @@ main(int argc, char *argv[])
 
     need_reconfigure = false;
     inited = false;
-    for (;;) {
+    exiting = false;
+    while (!exiting) {
         if (signal_poll(sighup)) {
             vlog_reopen_log_file();
         }
@@ -252,3 +256,12 @@ usage(void)
     leak_checker_usage();
     exit(EXIT_SUCCESS);
 }
+
+static void
+ovs_vswitchd_exit(struct unixctl_conn *conn, const char *args OVS_UNUSED,
+                  void *exiting_)
+{
+    bool *exiting = exiting_;
+    *exiting = true;
+    unixctl_command_reply(conn, 200, NULL);
+}