diff options
| author | Andrii Nakryiko <andriin@fb.com> | 2020-03-11 11:53:45 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-03-13 12:49:51 -0700 |
| commit | 2b5cf9fb74848fe5742a56e872e6847b79933c0b (patch) | |
| tree | dacdbf2b57b6865afe3f14591fe5c8b7d6f7ae42 /tools | |
| parent | 6ae32b29c09ba9b99c4c7317eed029587bd2706d (diff) | |
| download | linux-2b5cf9fb74848fe5742a56e872e6847b79933c0b.tar.gz linux-2b5cf9fb74848fe5742a56e872e6847b79933c0b.tar.bz2 linux-2b5cf9fb74848fe5742a56e872e6847b79933c0b.zip | |
selftests/bpf: Guarantee that useep() calls nanosleep() syscall
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>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/bpf/test_progs.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c index a969c77e9456..2b0bc1171c9c 100644 --- a/tools/testing/selftests/bpf/test_progs.c +++ b/tools/testing/selftests/bpf/test_progs.c @@ -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; |