tools/power turbostat: on SIGINT: sample, print and exit

When running in interval-mode, catch interrupts
and print a final data record before exiting.

Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/tools/power/x86/turbostat/turbostat.8 b/tools/power/x86/turbostat/turbostat.8
index 04262ab..2dafba4 100644 (file)
--- a/tools/power/x86/turbostat/turbostat.8
+++ b/tools/power/x86/turbostat/turbostat.8
@@ -267,6 +267,10 @@ CPU          PRF_CTRL
 
 .fi
 
+.SH SIGNALS
+
+SIGINT will interrupt interval-mode.
+The end-of-interval data will be collected and displayed before turbostat exits.
 .SH NOTES
 
 .B "turbostat "

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 627e574..d9703b7 100644 (file)
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -2600,11 +2600,37 @@ int snapshot_proc_sysfs_files(void)
        return 0;
 }
 
+int exit_requested;
+
+static void signal_handler (int signal)
+{
+       switch (signal) {
+       case SIGINT:
+               exit_requested = 1;
+               if (debug)
+                       fprintf(stderr, " SIGINT\n");
+               break;
+       }
+}
+
+void setup_signal_handler(void)
+{
+       struct sigaction sa;
+
+       memset(&sa, 0, sizeof(sa));
+
+       sa.sa_handler = &signal_handler;
+
+       if (sigaction(SIGINT, &sa, NULL) < 0)
+               err(1, "sigaction SIGINT");
+}
 void turbostat_loop()
 {
        int retval;
        int restarted = 0;
 
+       setup_signal_handler();
+
 restart:
        restarted++;
 
@@ -2646,6 +2672,8 @@ restart:
                compute_average(EVEN_COUNTERS);
                format_all_counters(EVEN_COUNTERS);
                flush_output_stdout();
+               if (exit_requested)
+                       break;
                nanosleep(&interval_ts, NULL);
                if (snapshot_proc_sysfs_files())
                        goto restart;
@@ -2665,6 +2693,8 @@ restart:
                compute_average(ODD_COUNTERS);
                format_all_counters(ODD_COUNTERS);
                flush_output_stdout();
+               if (exit_requested)
+                       break;
        }
 }