diff options
| author | Qiang Wang <wangqiang.wq.frank@bytedance.com> | 2021-12-27 21:07:13 +0800 |
|---|---|---|
| committer | Andrii Nakryiko <andrii.nakryiko@gmail.com> | 2022-01-06 16:20:54 -0800 |
| commit | b0c3d7133faa55fbcbc19f76f9cc9e183e178c97 (patch) | |
| tree | 1eef3c735992e147b43030b8588fd69764d1b472 /src | |
| parent | c2f2c26cb2dbe75051d7a98289783495b61ccafe (diff) | |
| download | libbpf-b0c3d7133faa55fbcbc19f76f9cc9e183e178c97.tar.gz | |
libbpf: Support repeated legacy kprobes on same function
If repeated legacy kprobes on same function in one process,
libbpf will register using the same probe name and got -EBUSY
error. So append index to the probe name format to fix this
problem.
Co-developed-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Qiang Wang <wangqiang.wq.frank@bytedance.com>
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211227130713.66933-2-wangqiang.wq.frank@bytedance.com
Diffstat (limited to 'src')
| -rw-r--r-- | src/libbpf.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/libbpf.c b/src/libbpf.c index 26e49e6..7f10dd5 100644 --- a/src/libbpf.c +++ b/src/libbpf.c @@ -9916,7 +9916,10 @@ static int append_to_file(const char *file, const char *fmt, ...) static void gen_kprobe_legacy_event_name(char *buf, size_t buf_sz, const char *kfunc_name, size_t offset) { - snprintf(buf, buf_sz, "libbpf_%u_%s_0x%zx", getpid(), kfunc_name, offset); + static int index = 0; + + snprintf(buf, buf_sz, "libbpf_%u_%s_0x%zx_%d", getpid(), kfunc_name, offset, + __sync_fetch_and_add(&index, 1)); } static int add_kprobe_event_legacy(const char *probe_name, bool retprobe, |