int close_perhaps(int *fd);
void xclose(int fd, const char *what, const char *what2);
void xclose_perhaps(int *fd, const char *what, const char *what2);
int close_perhaps(int *fd);
void xclose(int fd, const char *what, const char *what2);
void xclose_perhaps(int *fd, const char *what, const char *what2);