Commit 2b5cf9fb authored Mar 11, 2020 by Andrii Nakryiko Committed by Alexei Starovoitov Mar 13, 2020

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>

parent 6ae32b29

tools/testing/selftests/bpf/test_progs.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -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;

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