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bpf-program: document BPFProgram a bit
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@ -12,15 +12,23 @@
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typedef struct BPFProgram BPFProgram;
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/* This encapsulates three different concepts: the loaded BPF program, the BPF code, and the attachment to a
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* cgroup. Typically our BPF programs go through all three stages: we build the code, we load it, and finally
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* we attach it, but it might happen that we operate with programs that aren't loaded or aren't attached, or
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* where we don't have the code. */
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struct BPFProgram {
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unsigned n_ref;
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/* The loaded BPF program, if loaded */
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int kernel_fd;
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uint32_t prog_type;
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/* The code of it BPF program, if known */
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size_t n_instructions;
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struct bpf_insn *instructions;
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/* The cgroup path the program is attached to, if it is attached. If non-NULL bpf_program_unref()
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* will detach on destruction. */
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char *attached_path;
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int attached_type;
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uint32_t attached_flags;
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@ -37,6 +45,7 @@ int bpf_program_load_from_bpf_fs(BPFProgram *p, const char *path);
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int bpf_program_cgroup_attach(BPFProgram *p, int type, const char *path, uint32_t flags);
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int bpf_program_cgroup_detach(BPFProgram *p);
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int bpf_program_pin(int prog_fd, const char *bpffs_path);
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int bpf_program_get_id_by_fd(int prog_fd, uint32_t *ret_id);
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