receive_msg_with_cred
int receive_msg_with_cred(int, char *, size_t, struct cmsgcred *);
receive_msg_with_cred(cl->sock, &test, sizeof(test), &cred);
receive_msg_with_cred(fd_recv, (char *)&shmget_msg,
receive_msg_with_cred(fd_recv, (char *)&shmat_msg,
receive_msg_with_cred(fd_recv, (char *)&shmctl_msg,
receive_msg_with_cred(fd_recv, (char *)&shmid,