-int ust_create_trace(int sock, pid_t pid);
-int ust_start_trace(int sock, pid_t pid);
-int ust_stop_trace(int sock, pid_t pid);
+int ust_create_trace(struct command_ctx *cmd_ctx);
+int ust_start_trace(struct command_ctx *cmd_ctx);
+int ust_stop_trace(struct command_ctx *cmd_ctx);