[PATCH v1 2/8] perf record: Use sig_atomic_t for signal handlers

[Ian Rogers <irogers@google.com>]

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>
---
 tools/perf/builtin-record.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index e128b855ddde..5332b9c05f28 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -61,6 +61,7 @@
 #include <locale.h>
 #include <poll.h>
 #include <pthread.h>
+#include <stdatomic.h>
 #include <unistd.h>
 #ifndef HAVE_GETTID
 #include <syscall.h>
@@ -646,10 +647,10 @@ 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 +1927,7 @@ 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
-- 
2.38.0.135.g90850a2211-goog