pcp_msg_t
pcp_msg_t send_msg;
pcp_msg_t recv_msg;
pcp_send_recv(int channel_fd, pcp_msg_t *req_msg, pcp_msg_t *resp_msg,
int pcp_send_recv(int channel_fd, pcp_msg_t *req_msg, pcp_msg_t *resp_msg,
pcp_msg_t send_msg;
pcp_msg_t recv_msg;
pcp_msg_t send_msg;
pcp_msg_t recv_msg;