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[v2,8/8] perf trace: Use sig_atomic_t to avoid UB

Message ID 20221024181913.630986-9-irogers@google.com
State New
Headers
Series Update to C11, fix signal undefined behavior |

Commit Message

Ian Rogers Oct. 24, 2022, 6:19 p.m. UTC 
  Use sig_atomic_t for variables written/accessed in signal
handlers. This is undefined behavior as per:
https://wiki.sei.cmu.edu/confluence/display/c/SIG31-C.+Do+not+access+shared+objects+in+signal+handlers

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/builtin-trace.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index d3c757769b96..72991528687e 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1535,8 +1535,8 @@  static size_t trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)
 }
 
 static pid_t workload_pid = -1;
-static bool done = false;
-static bool interrupted = false;
+static volatile sig_atomic_t done = false;
+static volatile sig_atomic_t interrupted = false;
 
 static void sighandler_interrupt(int sig __maybe_unused)
 {