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| author | Song Chen <chensong_2000@189.cn> | 2022-04-02 16:57:08 +0800 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2022-04-04 14:43:57 -0700 |
| commit | 35f91d1fe106cd474ac0463157d012c675385e18 (patch) | |
| tree | 4e5ec527abf33d0c8ff6878224bbcdb1390b4e76 /samples/bpf | |
| parent | e93f39998d8f8ed456dfbb4ca68f9a159906cc6f (diff) | |
| download | lwn-35f91d1fe106cd474ac0463157d012c675385e18.tar.gz lwn-35f91d1fe106cd474ac0463157d012c675385e18.zip | |
sample: bpf: syscall_tp_user: Print result of verify_map
At the end of the test, we already print out
prog <prog number>: map ids <...> <...>
Value is the number read from kernel through bpf map, further print out
verify map:<map id> val:<...>
will help users to understand the program runs successfully.
Signed-off-by: Song Chen <chensong_2000@189.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/1648889828-12417-1-git-send-email-chensong_2000@189.cn
Diffstat (limited to 'samples/bpf')
| -rw-r--r-- | samples/bpf/syscall_tp_user.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/samples/bpf/syscall_tp_user.c b/samples/bpf/syscall_tp_user.c index a0ebf1833ed3..c55383068384 100644 --- a/samples/bpf/syscall_tp_user.c +++ b/samples/bpf/syscall_tp_user.c @@ -36,6 +36,9 @@ static void verify_map(int map_id) fprintf(stderr, "failed: map #%d returns value 0\n", map_id); return; } + + printf("verify map:%d val: %d\n", map_id, val); + val = 0; if (bpf_map_update_elem(map_id, &key, &val, BPF_ANY) != 0) { fprintf(stderr, "map_update failed: %s\n", strerror(errno)); |