Programming

./central 60 & ./external 1 60

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

typedef struct mymsg{
 long priority;
 int temp;
 int pid;
 int stable;
}msgp;

int main(int argc, char *argv[])
{
 msgp msgp;
 msgp.priority=2;
 msgp.temp=(int) argv[1];
 msgp.pid=70;
 msgp.stable=0;

//Create central mailbox
 int stat, msqid;
 if ((msqid = msgget(0070, 0666 | IPC_CREAT)) < 0) {
   perror("msgget");
   return 1;
 }
 else 
   (void) fprintf(stderr,"Central msgget: msgget succeeded: msqid = %d\n", msqid);

//Send message to external processes
 stat = msgsnd(msqid, &msgp, sizeof(msgp) - sizeof(long), 0);
 if ( stat < 0) {
    printf ("Insert details of message sent");
    perror("msgsnd");
    return 1;
 }
 else {
   printf("Central successfully sent the Message");
 }

 //temp=(2*temp+exTemps)/6;
 return 0;

}

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

typedef struct my_msg{
 long priority;
 int temp;
 int pid;
 int stable;
}msgp;

int main(int argc, char *argv[])
{
 msgp msgp;
 msgp.priority=2;
 msgp.temp=(int) argv[1];
 msgp.pid=(int) argv[2];
 msgp.stable=0;

 int msqid, stat;

//Create external mailbox
 if ((msqid = msgget(0070, 0666 | IPC_CREAT)) < 0) {
   perror("msgget");
   return 1;
 }
 else 
   (void) fprintf(stderr,"External msgget: msgget succeeded: msqid = %d\n", msqid);

//Wait to receive message
 stat = msgrcv(msqid, &msgp, sizeof(msgp)-sizeof(long), 2, 0);
 if (stat < 0) {
    printf ("Insert details of attempted received message");
    perror("msgrcv");
    exit(1);
 }
 else {
   printf("External successfully received the Message");
 }

 return 0;

}

msgrcv.c: In function 'main':
msgrcv.c:17: warning: cast from pointer to integer of different size
msgrcv.c:18: warning: cast from pointer to integer of different size
msgrcv.c:36: warning: incompatible implicit declaration of built-in function 'exit'

 msgp.temp=(int) argv[1];
 msgp.pid=(int) argv[2];

printf("msgp.temp=%d msgp.pid=%d\n", msgp.temp, msgp.pid);

msgp.temp=-521312457 msgp.pid=-521312455