Libbpf eBPF function bpf_usdt_cookie
The bpf_usdt_cookie function returns the cookie associated with the attach point.
Definition
Retrieve user-specified cookie value provided during attach as bpf_usdt_opts.usdt_cookie. This serves the same purpose as BPF cookie returned by bpf_get_attach_cookie. Libbpf's support for USDT is itself
utilizing BPF cookies internally, so user can't use BPF cookie directly for USDT programs and has to use bpf_usdt_cookie API instead.
Usage
This function uses specifiers that describe the tracepoint. These specifiers live in maps, defined in usdt.bpf.h which should be populated by the loader, in particular the bpf_program__attach_usdt function.
Example
Docs could be improved
This part of the docs is incomplete, contributions are very welcome