* // Simple helper to read a single char.
* static int do_readchar(int fd, struct io_plan_arg *arg)
* {
* return read(fd, arg->u1.cp, 1) <= 0 ? -1 : 1;
* }
*
* // Simple helper to read a single char.
* static int do_readchar(int fd, struct io_plan_arg *arg)
* {
* return read(fd, arg->u1.cp, 1) <= 0 ? -1 : 1;
* }
*