/* set_binary_mode (fd, mode)
sets the binary/text I/O mode of file descriptor fd to the given mode
(must be O_BINARY or O_TEXT) and returns the previous mode. */
/* set_binary_mode (fd, mode)
sets the binary/text I/O mode of file descriptor fd to the given mode
(must be O_BINARY or O_TEXT) and returns the previous mode. */