#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <time.h>
#include <string.h>
#include <stdbool.h>
#define MSGLEN (16)

void checker(bool exp, const char *usrmsg, const char *file, const char *func, const int line){
    if(!(exp)){
        perror(usrmsg);
        fprintf(stderr, "%s %s %d\n", file, func, line);
        exit(EXIT_FAILURE);
    }
}
#define osAssert(exp, usrmsg) checker(exp, usrmsg, __FILE__, __func__, __LINE__);

int main(int argc, char **argv){
    osAssert(2 == argc, "nema dovoljno argumenara");
    mode_t oldMask = umask(0);
    osAssert(-1 != mkfifo(argv[1], 0600), "make fifo failed");
    int fd = open(argv[1], O_WRONLY);
    osAssert(-1 != fd, "open failed");
    srand(time(NULL));
    char buf[MSGLEN];
    do{
        sprintf(buf, "%d", rand());
        osAssert(-1 != write(fd, buf, MSGLEN), "error write");
        printf("hocete jos? ");
        scanf("%s", buf);
    } while (!strcasecmp("da",buf));
    umask(oldMask);
    close(fd);

    return 0;
}