void *para_mmap(size_t length, int prot, int flags, int fd, off_t offset);
int para_open(const char *path, int flags, mode_t mode);
int para_opendir(const char *dirname, DIR **dir, int *cwd);
void *para_mmap(size_t length, int prot, int flags, int fd, off_t offset);
int para_open(const char *path, int flags, mode_t mode);
int para_opendir(const char *dirname, DIR **dir, int *cwd);