/*
** seminit.c -- sets up a semaphore for semdemo.c
*/

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

int main(void)
{
    key_t key;
    int semid;
    union semun arg;

    if ((key = ftok("semdemo.c", 'J')) == -1) {
        perror("ftok");
        exit(1);
    }

    /* create a semaphore set with 1 semaphore: */
    if ((semid = semget(key, 1, 0666 | IPC_CREAT)) == -1) {
        perror("semget");
        exit(1);
    }

    /* initialize semaphore #0 to 1: */
    arg.val = 1;
    if (semctl(semid, 0, SETVAL, arg) == -1) {
        perror("semctl");
        exit(1);
    }

    return 0;
}