bpf-program: export hash_ops for BPFProgam objects

src/shared/bpf-program.c

@@ -36,6 +36,8 @@ static const char *const bpf_cgroup_attach_type_table[__MAX_BPF_ATTACH_TYPE] = {
 
 DEFINE_STRING_TABLE_LOOKUP(bpf_cgroup_attach_type, int);
 
+DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(bpf_program_hash_ops, void, trivial_hash_func, trivial_compare_func, bpf_program_unref);
+
  /* struct bpf_prog_info info must be initialized since its value is both input and output
   * for BPF_OBJ_GET_INFO_BY_FD syscall. */
 static int bpf_program_get_info_by_fd(int prog_fd, struct bpf_prog_info *info, uint32_t info_len) {

src/shared/bpf-program.h

@@ -38,6 +38,8 @@ int bpf_program_cgroup_detach(BPFProgram *p);
 int bpf_program_pin(int prog_fd, const char *bpffs_path);
 int bpf_program_get_id_by_fd(int prog_fd, uint32_t *ret_id);
 
+extern const struct hash_ops bpf_program_hash_ops;
+
 int bpf_map_new(enum bpf_map_type type, size_t key_size, size_t value_size, size_t max_entries, uint32_t flags);
 int bpf_map_update_element(int fd, const void *key, void *value);
 int bpf_map_lookup_element(int fd, const void *key, void *value);