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perf test sigtrap: Print errno string when failing 

Helps a bit the user figuring out why it is failing:

Before:

  $ perf test sigtrap
  73: Sigtrap                                                         : FAILED!
  $ perf test -v sigtrap
  73: Sigtrap                                                         :
  --- start ---
  test child forked, pid 3816772
  FAILED sys_perf_event_open()
  test child finished with -1
  ---- end ----
  Sigtrap: FAILED!
  $

After:

  $ perf test sigtrap
  73: Sigtrap                                                         : FAILED!
  $ perf test -v sigtrap
  73: Sigtrap                                                         :
  --- start ---
  test child forked, pid 3816772
  FAILED sys_perf_event_open(): Permission denied
  test child finished with -1
  ---- end ----
  Sigtrap: FAILED!
  $

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Fabian Hemmer <copy@copy.sh>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Marco Elver <elver@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kasan-dev@googlegroups.com
Link: http://lore.kernel.org/lkml/YZOpSVOCXe0zWeRs@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2021-11-16 09:51:48 -03:00
parent 5504f67944
commit e9c08f7229
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
tools/perf/tests/sigtrap.c
View File

@ -5,9 +5,11 @@
* Copyright (C) 2021, Google LLC.
*/
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <linux/hw_breakpoint.h>
#include <linux/string.h>
#include <pthread.h>
#include <signal.h>
#include <sys/ioctl.h>
@ -117,6 +119,7 @@ static int test__sigtrap(struct test_suite *test __maybe_unused, int subtest __m
struct sigaction oldact;
pthread_t threads[NUM_THREADS];
pthread_barrier_t barrier;
char sbuf[STRERR_BUFSIZE];
int i, fd, ret = TEST_FAIL;
pthread_barrier_init(&barrier, NULL, NUM_THREADS + 1);
@ -125,19 +128,19 @@ static int test__sigtrap(struct test_suite *test __maybe_unused, int subtest __m
action.sa_sigaction = sigtrap_handler;
sigemptyset(&action.sa_mask);
if (sigaction(SIGTRAP, &action, &oldact)) {
pr_debug("FAILED sigaction()\n");
pr_debug("FAILED sigaction(): %s\n", str_error_r(errno, sbuf, sizeof(sbuf)));
goto out;
}
fd = sys_perf_event_open(&attr, 0, -1, -1, perf_event_open_cloexec_flag());
if (fd < 0) {
pr_debug("FAILED sys_perf_event_open()\n");
pr_debug("FAILED sys_perf_event_open(): %s\n", str_error_r(errno, sbuf, sizeof(sbuf)));
goto out_restore_sigaction;
}
for (i = 0; i < NUM_THREADS; i++) {
if (pthread_create(&threads[i], NULL, test_thread, &barrier)) {
pr_debug("FAILED pthread_create()");
pr_debug("FAILED pthread_create(): %s\n", str_error_r(errno, sbuf, sizeof(sbuf)));
goto out_close_perf_event;
}
}