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

#define MSQKEY      34856
#define MSQSIZE     32

struct mymsgbuf {
    long    mtype;
    char    mtext[MSQSIZE];
};

int
main(void)
{
    key_t key;
    int n, msqid;
    struct mymsgbuf mb;

    /*
     * Get a message queue.  The server must have created it
     * already.
     */
    key = MSQKEY;
    if ((msqid = msgget(key, 0666)) < 0) {
        perror("msgget");
        exit(1);
    }

    /*
     * Read data from standard input and send it in
     * messages of type 1.
     */
    mb.mtype = 1;
    while ((n = read(0, mb.mtext, MSQSIZE)) > 0) {
        if (msgsnd(msqid, &mb, n, 0) < 0) {
            perror("msgsnd");
            exit(1);
        }
    }

    /*
     * Send a message of type 2 to indicate we're done.
     */
    mb.mtype = 2;
    memset(mb.mtext, 0, MSQSIZE);
    if (msgsnd(msqid, &mb, MSQSIZE, 0) < 0) {
        perror("msgsnd");
        exit(1);
    }

    exit(0);
}