6 static unsigned long flag = PERF_FLAG_FD_CLOEXEC;
8 static int perf_flag_probe(void)
10 /* use 'safest' configuration as used in perf_evsel__fallback() */
11 struct perf_event_attr attr = {
12 .type = PERF_COUNT_SW_CPU_CLOCK,
13 .config = PERF_COUNT_SW_CPU_CLOCK,
18 /* check cloexec flag */
19 fd = sys_perf_event_open(&attr, 0, -1, -1,
20 PERF_FLAG_FD_CLOEXEC);
28 WARN_ONCE(err != EINVAL,
29 "perf_event_open(..., PERF_FLAG_FD_CLOEXEC) failed with unexpected error %d (%s)\n",
32 /* not supported, confirm error related to PERF_FLAG_FD_CLOEXEC */
33 fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
37 "perf_event_open(..., 0) failed unexpectedly with error %d (%s)\n",
46 unsigned long perf_event_open_cloexec_flag(void)
51 if (perf_flag_probe() <= 0)