cloexec.c (a5b0153c880c2775bf5bdd78306f0a47e860ea04) cloexec.c (f6edb53c4993ffe92ce521fb449d1c146cea6ec2)
1#include <sched.h>
1#include "util.h"
2#include "../perf.h"
3#include "cloexec.h"
4#include "asm/bug.h"
5
6static unsigned long flag = PERF_FLAG_FD_CLOEXEC;
7
8static int perf_flag_probe(void)
9{
10 /* use 'safest' configuration as used in perf_evsel__fallback() */
11 struct perf_event_attr attr = {
12 .type = PERF_TYPE_SOFTWARE,
13 .config = PERF_COUNT_SW_CPU_CLOCK,
14 .exclude_kernel = 1,
15 };
16 int fd;
17 int err;
2#include "util.h"
3#include "../perf.h"
4#include "cloexec.h"
5#include "asm/bug.h"
6
7static unsigned long flag = PERF_FLAG_FD_CLOEXEC;
8
9static int perf_flag_probe(void)
10{
11 /* use 'safest' configuration as used in perf_evsel__fallback() */
12 struct perf_event_attr attr = {
13 .type = PERF_TYPE_SOFTWARE,
14 .config = PERF_COUNT_SW_CPU_CLOCK,
15 .exclude_kernel = 1,
16 };
17 int fd;
18 int err;
19 int cpu;
20 pid_t pid = -1;
18
21
19 /* check cloexec flag */
20 fd = sys_perf_event_open(&attr, 0, -1, -1,
21 PERF_FLAG_FD_CLOEXEC);
22 cpu = sched_getcpu();
23 if (cpu < 0)
24 cpu = 0;
25
26 while (1) {
27 /* check cloexec flag */
28 fd = sys_perf_event_open(&attr, pid, cpu, -1,
29 PERF_FLAG_FD_CLOEXEC);
30 if (fd < 0 && pid == -1 && errno == EACCES) {
31 pid = 0;
32 continue;
33 }
34 break;
35 }
22 err = errno;
23
24 if (fd >= 0) {
25 close(fd);
26 return 1;
27 }
28
29 WARN_ONCE(err != EINVAL && err != EBUSY,
30 "perf_event_open(..., PERF_FLAG_FD_CLOEXEC) failed with unexpected error %d (%s)\n",
31 err, strerror(err));
32
33 /* not supported, confirm error related to PERF_FLAG_FD_CLOEXEC */
36 err = errno;
37
38 if (fd >= 0) {
39 close(fd);
40 return 1;
41 }
42
43 WARN_ONCE(err != EINVAL && err != EBUSY,
44 "perf_event_open(..., PERF_FLAG_FD_CLOEXEC) failed with unexpected error %d (%s)\n",
45 err, strerror(err));
46
47 /* not supported, confirm error related to PERF_FLAG_FD_CLOEXEC */
34 fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
48 fd = sys_perf_event_open(&attr, pid, cpu, -1, 0);
35 err = errno;
36
37 if (WARN_ONCE(fd < 0 && err != EBUSY,
38 "perf_event_open(..., 0) failed unexpectedly with error %d (%s)\n",
39 err, strerror(err)))
40 return -1;
41
42 close(fd);

--- 16 unchanged lines hidden --- 		49 err = errno;
50
51 if (WARN_ONCE(fd < 0 && err != EBUSY,
52 "perf_event_open(..., 0) failed unexpectedly with error %d (%s)\n",
53 err, strerror(err)))
54 return -1;
55
56 close(fd);

--- 16 unchanged lines hidden ---