root/sysv-ipc/messqcli.c

DEFINITIONS

1. printrequest
2. randomrequest
3. main

#include<sys/ipc.h>
#include<stdlib.h>
#include<stdio.h>
#include<string.h>
#include<errno.h>

#define RAND(i) (random()%(i))
#define NELS(i) (sizeof(i)/sizeof(*i))

#define APPPATH "/etc/passwd"
#define LANDING 10L
#define TAKINGOFF 20L

long types[]={LANDING,TAKINGOFF};
char planes[][30]={"THY","Airbus","Alitalia","SwissAir","KLM","British"};
char cities[][30]={"Trabzon","Istanbul","Munich","Paris","Londra","Roma","Prag","Atina"};
char models[][20]={"A320","B747","B737","DG10","A310","B757"};

struct Request {
        long type;
        int no;
        char name[30];
        char city[30];
        char model[20];
};

void printrequest(struct Request *r) {
        printf("Airline: %s, No: %d, Model: %s\n",
                r->name,r->no,r->model);
        if (r->type==LANDING) 
                printf("Coming from %s\n\n",r->city);
        else 
                printf("Departing to %s\n\n",r->city);
}

void randomrequest(struct Request *r) {
        int tmp;
        r->type=types[RAND(NELS(types))];
        strncpy(r->name,planes[RAND(NELS(planes))],30);
        strncpy(r->city,cities[RAND(NELS(cities))],30);
        strncpy(r->model,models[RAND(NELS(models))],20);
        r->no=RAND(1000);
}

int main() {
        struct Request req;
        long queueid,key;
        queueid=ftok(APPPATH,0);
        if ((key=msgget(queueid,0664))<0) {
                perror("opening queue");
                exit(1);
        }
        while (1) {
                randomrequest(&req);
                printrequest(&req);
                msgsnd(key,&req,sizeof(struct Request),0);
                sleep(RAND(10));
        }
}