Messages in this thread Patch in this message | | | From | Qiang Wang <> | Subject | [PATCH v2 2/2] libbpf: Support repeated legacy kprobes on same function | Date | Mon, 27 Dec 2021 21:07:13 +0800 |
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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> --- tools/lib/bpf/libbpf.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index b7d6c951fa09..698e8864da02 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -9634,7 +9634,10 @@ 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, -- 2.20.1
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