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perf record: Use sig_atomic_t for signal handlers

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This removes undefined behavior as described in:

  https://wiki.sei.cmu.edu/confluence/display/c/SIG31-C.+Do+not+access+shared+objects+in+signal+handlers

Suggested-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20221024181913.630986-3-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2022-10-24 11:19:07 -07:00 committed by Arnaldo Carvalho de Melo
parent f3c9bd4e16
commit 8ed28c2b56
1 changed files with 4 additions and 4 deletions
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8
tools/perf/builtin-record.c
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@ -646,10 +646,10 @@ static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size)
return record__write(rec, map, bf, size);
}
static volatile int signr = -1;
static volatile int child_finished;
static volatile sig_atomic_t signr = -1;
static volatile sig_atomic_t child_finished;
#ifdef HAVE_EVENTFD_SUPPORT
static volatile int done_fd = -1;
static volatile sig_atomic_t done_fd = -1;
#endif
static void sig_handler(int sig)
@ -1926,7 +1926,7 @@ static void record__read_lost_samples(struct record *rec)
}
static volatile int workload_exec_errno;
static volatile sig_atomic_t workload_exec_errno;
/*
* evlist__prepare_workload will send a SIGUSR1