Part B-1

 

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <sys/ipc.h>

#include <sys/msg.h>

 

#define PERMS 0644

struct my_msgbuf {

    long mtype;

    char mtext[200];

};

 

int main(void) {

    struct my_msgbuf buf;

    int msqid;

    int len;

    key_t key;

    system("touch msgq.txt");

 

    if ((key = ftok("msgq.txt", 'B')) == -1) {

       perror("ftok");

       exit(1);

 }

 

    if ((msqid = msgget(key, PERMS | IPC_CREAT)) == -1) {

       perror("msgget");

       exit(1);

    }

    printf("message queue: ready to send messages. \n");

    printf("enter lines of text, ^D to quit: \n");

    buf.mtype = 1;

 

   while(fgets(buf.mtext, sizeof buf.mtext, stdin) != NULL) {

        len = strlen(buf.mtext);

 

         if (buf.mtext[len-1] == '\n') buf.mtext[len-1] = '\0';

         if (msgsnd(msqid, &buf, len+1, 0) == -1)

         perror("msgsnd");

    }

     strcpy(buf.mtext, "end");

len = strlen(buf.mtext);

      if (msgsnd(msqid, &buf, len+1, 0) ==-1)

      perror("msgsnd");

 

     if (msgctl(msqid, IPC_RMID, NULL) == -1) {

       perror("msgctl");

       exit(1);

    }

    printf("message queue: done sending messages. \n");

    return 0;

}