read_build_id
err = read_build_id(filename, bid);
ret = read_build_id(buf, p_filesz, bid, need_swap);
ret = read_build_id(buf, buf_size, bid, false);
build_id_sz = read_build_id("uprobe_multi", build_id, sizeof(build_id));
build_id_size = read_build_id("urandom_read", buf, sizeof(buf));
build_id_size = read_build_id("urandom_read", buf, sizeof(buf));
int read_build_id(const char *path, char *build_id, size_t size);