8 static unsigned long flag
= PERF_FLAG_FD_CLOEXEC
;
10 static int perf_flag_probe(void)
12 /* use 'safest' configuration as used in perf_evsel__fallback() */
13 struct perf_event_attr attr
= {
14 .type
= PERF_TYPE_SOFTWARE
,
15 .config
= PERF_COUNT_SW_CPU_CLOCK
,
22 char sbuf
[STRERR_BUFSIZE
];
29 /* check cloexec flag */
30 fd
= sys_perf_event_open(&attr
, pid
, cpu
, -1,
31 PERF_FLAG_FD_CLOEXEC
);
32 if (fd
< 0 && pid
== -1 && errno
== EACCES
) {
45 WARN_ONCE(err
!= EINVAL
&& err
!= EBUSY
,
46 "perf_event_open(..., PERF_FLAG_FD_CLOEXEC) failed with unexpected error %d (%s)\n",
47 err
, strerror_r(err
, sbuf
, sizeof(sbuf
)));
49 /* not supported, confirm error related to PERF_FLAG_FD_CLOEXEC */
50 fd
= sys_perf_event_open(&attr
, pid
, cpu
, -1, 0);
53 if (WARN_ONCE(fd
< 0 && err
!= EBUSY
,
54 "perf_event_open(..., 0) failed unexpectedly with error %d (%s)\n",
55 err
, strerror_r(err
, sbuf
, sizeof(sbuf
))))
63 unsigned long perf_event_open_cloexec_flag(void)
68 if (perf_flag_probe() <= 0)
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