Server

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <errno.h>
#include <string.h>
#include <time.h>

#define SHMSZ 27

struct ids {
    pid_t pid;
    uid_t p_uid;
    uid_t p_gid;
};

int main(int argc, char * argv[]) {
    struct ids process;
    key_t key; /*Name of shared memory segment*/
    int shmid;
    time_t timer, stime;
    double load[3];
    int *shm;
    int *data;
    int c;

    stime = time(NULL);
    process.pid = getpid();
    process.p_uid = getuid();
    process.p_gid = getgid();
    key = 669;

    /*Create the segment*/
        if ((shmid = shmget(key, SHMSZ, IPC_CREAT | 0666)) < 0) {
            perror(strerror(errno));
            exit(1);
        }

    /*Attach the segment to our data space*/
        if ((shm = shmat(shmid, NULL, 0)) == (int *) -1) {
            perror(strerror(errno));
            exit(1);
        }

        /*Put some things into the memory for the other process to read*/
        data = shm;

    *data++ = process.pid;
    *data++ = process.p_uid;
    *data++ = process.p_gid;

    /*printf("%i\n", data[shm]);
    printf("%i\n", data[shm + 1]);
    printf("%i\n", data[shm + 2]);*/

        *data = NULL;

    for(;;) {
        if (getloadavg(load, 3) < 0) {
            perror(strerror(errno));
            exit(1);
        }
        else {
            printf("Load average:\t1m - %f\t5m - %f\t15m - %f\t\n", load[0], load[1], load[2]);
            timer = time(NULL);
            printf("Time:\t%.0f\n", difftime(timer, stime));
        }
        sleep(1);
    }

}