perf evlist: Send the errno in the signal when workload fails

When a tool uses perf_evlist__start_workload and the supplied workload
fails (e.g.: its binary wasn't found), perror was being used to print
the error reason.

This is undesirable, as the caller may be a GUI, when it wants to have
total control of the error reporting process.

So move to using sigaction(SA_SIGINFO) + siginfo_t->sa_value->sival_int
to communicate to the caller the errno and let it print it using the UI
of its choosing.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-epgcv7kjq8ll2udqfken92pz@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 15 insertions, 6 deletions

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 1c76c7a66f78..9d0d52d55ee6 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -58,6 +58,7 @@
 #include "util/thread.h"
 #include "util/thread_map.h"
 
+#include <signal.h>
 #include <stdlib.h>
 #include <sys/prctl.h>
 #include <locale.h>
@@ -509,16 +510,17 @@ static void handle_initial_delay(void)
         }
 }
 
-static volatile bool workload_exec_failed;
+static volatile int workload_exec_errno;
 
 /*
  * perf_evlist__prepare_workload will send a SIGUSR1
  * if the fork fails, since we asked by setting its
  * want_signal to true.
  */
-static void workload_exec_failed_signal(int signo __maybe_unused)
+static void workload_exec_failed_signal(int signo __maybe_unused, siginfo_t *info,
+                                        void *ucontext __maybe_unused)
 {
-        workload_exec_failed = true;
+        workload_exec_errno = info->si_value.sival_int;
 }
 
 static int __run_perf_stat(int argc, const char **argv)
@@ -596,13 +598,17 @@ static int __run_perf_stat(int argc, const char **argv)
         clock_gettime(CLOCK_MONOTONIC, &ref_time);
 
         if (forks) {
+                struct sigaction act = {
+                        .sa_flags     = SA_SIGINFO,
+                        .sa_sigaction = workload_exec_failed_signal,
+                };
                 /*
                  * perf_evlist__prepare_workload will, after we call
                  * perf_evlist__start_Workload, send a SIGUSR1 if the exec call
                  * fails, that we will catch in workload_signal to flip
-                 * workload_exec_failed.
+                 * workload_exec_errno.
                  */
-                signal(SIGUSR1, workload_exec_failed_signal);
+                sigaction(SIGUSR1, &act, NULL);
 
                 perf_evlist__start_workload(evsel_list);
                 handle_initial_delay();
@@ -615,8 +621,11 @@ static int __run_perf_stat(int argc, const char **argv)
                 }
                 wait(&status);
 
-                if (workload_exec_failed)
+                if (workload_exec_errno) {
+                        const char *emsg = strerror_r(workload_exec_errno, msg, sizeof(msg));
+                        pr_err("Workload failed: %s\n", emsg);
                         return -1;
+                }
 
                 if (WIFSIGNALED(status))
                         psignal(WTERMSIG(status), argv[0]);