[PATCH 11/22] perf daemon: Add stop command

[Jiri Olsa]

Add 'perf daemon stop' command to stop daemon process
and all running sessions.

Example:

  # cat ~/.perfconfig
  [daemon]
  base=/opt/perfdata

  [session-cycles]
  run = -m 10M -e cycles --overwrite --switch-output -a

  [session-sched]
  run = -m 20M -e sched:* --overwrite --switch-output -a

Starting the daemon:

  # perf daemon start

Stopping the daemon

  # perf daemon stop

Daemon is not running, nothing to connect to:

  # perf daemon
  connect error: Connection refused

Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
 tools/perf/builtin-daemon.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
index a7ffbecf8d14..45748bb471ec 100644
--- a/tools/perf/builtin-daemon.c
+++ b/tools/perf/builtin-daemon.c
@@ -524,6 +524,7 @@ static int setup_server_socket(struct daemon *daemon)
 enum {
        CMD_LIST   = 0,
        CMD_SIGNAL = 1,
+       CMD_STOP   = 2,
        CMD_MAX,
 };
 
@@ -650,6 +651,10 @@ static int handle_server_socket(struct daemon *daemon, int 
sock_fd)
        case CMD_SIGNAL:
                ret = cmd_session_kill(daemon, &cmd, out);
                break;
+       case CMD_STOP:
+               done = 1;
+               pr_debug("perf daemon is exciting\n");
+               break;
        default:
                break;
        }
@@ -992,6 +997,27 @@ static int __cmd_signal(struct daemon *daemon, struct 
option parent_options[],
        return send_cmd(daemon, &cmd);
 }
 
+static int __cmd_stop(struct daemon *daemon, struct option parent_options[],
+                       int argc, const char **argv)
+{
+       struct option start_options[] = {
+               OPT_PARENT(parent_options),
+               OPT_END()
+       };
+       union cmd cmd = { .cmd = CMD_STOP, };
+
+       argc = parse_options(argc, argv, start_options, daemon_usage, 0);
+       if (argc)
+               usage_with_options(daemon_usage, start_options);
+
+       if (setup_config(daemon)) {
+               pr_err("failed: config not found\n");
+               return -1;
+       }
+
+       return send_cmd(daemon, &cmd);
+}
+
 int cmd_daemon(int argc, const char **argv)
 {
        struct option daemon_options[] = {
@@ -1015,6 +1041,8 @@ int cmd_daemon(int argc, const char **argv)
        if (argc) {
                if (!strcmp(argv[0], "signal"))
                        return __cmd_signal(&__daemon, daemon_options, argc, 
argv);
+               else if (!strcmp(argv[0], "stop"))
+                       return __cmd_stop(&__daemon, daemon_options, argc, 
argv);
 
                pr_err("failed: unknown command '%s'\n", argv[0]);
                return -1;
-- 
2.26.2