/* Using the message queue IPC */
/* Sending process */
/* Initial variant */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#define MSQSIZ 1024

struct msgbf { long mtype;
               char mtext [MSQSIZ];
                    }; 

int main (int argc, char * argv[])

{int msid, v;
 int i;
 struct msgbf mess;

 if (argc != 4) {printf ("Usage: <key> <type> <text>\n"); exit (1);}

 /* Creating or get message queue */
 msid = msgget ((key_t) atoi (argv[1]), IPC_CREAT | 0666);
 if (msid == -1) {printf("Cannot get message queue\n"); exit (1);}

 /* Prepare a message from command line parameters */
 mess.mtype = atoi (argv[2]);
 strcpy (mess.mtext, argv[3]);
 printf("Wait... Sender is working...\n");

 /* Write the message into the queue */
  
 v = msgsnd(msid, (struct msgbuf *)&mess,
                   strlen(argv[3]) + 1, 0);
 if (v < 0) printf("ERROR writing to message queue\n");
 

printf("Sender terminated\n");
exit(0);
}