int osl_open(const char *path, int flags, mode_t mode);
int para_opendir(const char *dirname, DIR **dir, int *cwd);
-int para_fchdir(int fd);
int mmap_full_file(const char *filename, int open_mode, void **map,
size_t *size, int *fd_ptr);
int osl_munmap(void *start, size_t length);