[PATCH 6/8] perf daemon: Add stop command

[Jiri Olsa]

Allow 'perf daemon' to stop daemon process:

  # perf daemon --stop
  perf daemon is exciting

Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
 tools/perf/Documentation/perf-daemon.txt |  8 ++++++++
 tools/perf/builtin-daemon.c              | 10 ++++++++++
 2 files changed, 18 insertions(+)

diff --git a/tools/perf/Documentation/perf-daemon.txt 
b/tools/perf/Documentation/perf-daemon.txt
index 203ec4bf704c..87de2c77e4c7 100644
--- a/tools/perf/Documentation/perf-daemon.txt
+++ b/tools/perf/Documentation/perf-daemon.txt
@@ -35,6 +35,9 @@ OPTIONS
        Send SIGUSR2 to specific session, if session is not specified,
        send SIGUSR2 to all sessions.
 
+--stop::
+       Stop daemon.
+
 -v::
 --verbose::
        Be more verbose.
@@ -116,6 +119,11 @@ And check that the perf data dump was trigered:
   [ perf record: Dump /opt/perfdata/2/perf.data.2020120715220385 ]
 
 
+Stop daemon:
+
+  # perf daemon --stop
+  perf daemon is exciting
+
 SEE ALSO
 --------
 linkperf:perf-record[1], linkperf:perf-config[1]
diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
index c53d4ddc2b49..855fed2fe364 100644
--- a/tools/perf/builtin-daemon.c
+++ b/tools/perf/builtin-daemon.c
@@ -451,6 +451,7 @@ enum cmd {
        CMD_LIST         = 0,
        CMD_LIST_VERBOSE = 1,
        CMD_SIGNAL       = 2,
+       CMD_STOP         = 3,
        CMD_MAX,
 };
 
@@ -528,6 +529,10 @@ static int handle_server_socket(struct daemon *daemon, int 
sock_fd)
        case CMD_SIGNAL:
                ret = cmd_session_kill(daemon, out, fd);
                break;
+       case CMD_STOP:
+               done = 1;
+               pr_debug("perf daemon is exciting\n");
+               break;
        default:
                break;
        }
@@ -811,6 +816,7 @@ int cmd_daemon(int argc, const char **argv)
 {
        bool foreground = false;
        bool signal = false;
+       bool stop = false;
        const char *config = NULL;
        const char *signal_str = NULL;
        struct daemon daemon = {
@@ -821,6 +827,7 @@ int cmd_daemon(int argc, const char **argv)
                OPT_INCR('v', "verbose", &verbose, "be more verbose"),
                OPT_STRING(0, "config", &config,
                           "config file", "config file path"),
+               OPT_BOOLEAN(0, "stop", &stop, "stop daemon"),
                OPT_BOOLEAN('f', "foreground", &foreground, "stay on console"),
                OPT_STRING_OPTARG_SET('s', "signal", &signal_str, &signal,
                                      "signal", "send signal to session", 
"all"),
@@ -837,5 +844,8 @@ int cmd_daemon(int argc, const char **argv)
        if (signal)
                return send_cmd(&daemon, CMD_SIGNAL, signal_str);
 
+       if (stop)
+               return send_cmd(&daemon, CMD_STOP, NULL);
+
        return send_cmd(&daemon, verbose ? CMD_LIST_VERBOSE : CMD_LIST, NULL);
 }
-- 
2.26.2