extern (C)
{
    int open(char*, int, ...);
    int read(int, void*, size_t);
    int write(int, void*, size_t);
    int close(int);
    off_t lseek(int, off_t, int);
    int fstat(int, struct_stat*);
    int stat(char*, struct_stat*);
    int getErrno();
    int chdir(char*);
    int mkdir(char*, int);
    int rmdir(char*);
    char* getcwd(char*, int);

    int gettimeofday(timeval*, void*);
    time_t time(time_t*);
    tm *localtime(time_t*);

    // version( Unix_Posix_Sempahore ) ?
    int sem_init (sem_t *, int, uint);
    int sem_destroy (sem_t *);
    sem_t * sem_open (char *, int, ...);
    int sem_close(sem_t *);
    int sem_wait(sem_t*);
    int sem_post(sem_t*);
    // there are a few more..

    int sigfillset(sigset_t*);
    int sigdelset(sigset_t*, int);
    int sigaction(int, sigaction_t*, sigaction_t*);
    int sigsuspend(sigset_t*);
    
    // version ( Unix_Pthread )...
    int pthread_create(pthread_t*, void*, void* (*)(void*), void*);
    int pthread_join(pthread_t, void**);
    int pthread_kill(pthread_t, int);
    pthread_t pthread_self();
    int pthread_equal(pthread_t, pthread_t);

    // version ( Unix_Sched )
    void sched_yield();
}
