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selftests/bpf: Guarantee that useep() calls nanosleep() syscall

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Some implementations of C runtime library won't call nanosleep() syscall from
usleep(). But a bunch of kprobe/tracepoint selftests rely on nanosleep being
called to trigger them. To make this more reliable, "override" usleep
implementation and call nanosleep explicitly.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Cc: Julia Kartseva <hex@fb.com>
Link: https://lore.kernel.org/bpf/20200311185345.3874602-1-andriin@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2020-03-11 11:53:45 -07:00 committed by Alexei Starovoitov
parent 6ae32b29c0
commit 2b5cf9fb74
1 changed files with 9 additions and 0 deletions
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9
tools/testing/selftests/bpf/test_progs.c
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@ -29,6 +29,15 @@ struct prog_test_def {
int old_error_cnt;
};
/* Override C runtime library's usleep() implementation to ensure nanosleep()
* is always called. Usleep is frequently used in selftests as a way to
* trigger kprobe and tracepoints.
*/
int usleep(useconds_t usec)
{
return syscall(__NR_nanosleep, usec * 1000UL);
}
static bool should_run(struct test_selector *sel, int num, const char *name)
{
int i;