#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <stdio.h>

#define MSGSZ     128

#ifdef	NOT_USED
/*
 * Declare the message structure.
 */
struct msgbuf {
    long    mtype;
    char    mtext[MSGSZ];
};
#endif	/* NOT_USED */

main()
{
    int msqid;
    key_t key;
    struct msgbuf sbuf, rbuf;

    /*
     * Get the message queue id for the
     * "name" 1234, which was created by
     * the server.
     */
    key = 1234;

    if ((msqid = msgget(key, 0666)) < 0) {
        perror("msgget");
        exit(1);
    }

    /*
     * We'll send message type 1, the server
     * will send message type 2.
     */
    sbuf.mtype = 1;
    sprintf(sbuf.mtext, "Did you get this?");

    /*
     * Send a message.
     */
    if (msgsnd(msqid, &sbuf, strlen(sbuf.mtext) + 1, 0) < 0) {
        perror("msgsnd");
        exit(1);
    }

    /*
     * Receive an answer of message type 2.
     */
    if (msgrcv(msqid, &rbuf, MSGSZ, 2, 0) < 0) {
        perror("msgrcv");
        exit(1);
    }

    /*
     * Print the answer.
     */
    printf("%s\n", rbuf.mtext);
    exit(0);
}