#include <sys/file.h>

int flock(int fd, int operation)
		

#include <unistd.h>
#include <stdlib.h>
#include <sys/file.h>
#include <sys/types.h>
#include <sys/stat.h>

int main(int argc, char **argv)
{
    int fd;
    int id;
    int i;
    char *file_name = "lock.file";

    id = atoi(argv[1]);
    fd = open(file_name, O_RDONLY);
    sleep(1);
    if (flock(fd, LOCK_EX) != 0)
    {
        printf("flock error\n");
        exit(0);
    }

    for (i =0; i < 5; i++)
    {
        printf("OK File FD %d : %d\n", id,i);
        sleep(1);
    }
    if (flock(fd, LOCK_UN) != 0)
    {
        printf("filue un lock error\n");
    }
    close(fd);
}