Здравстуйте, маленький вопрос -
"Technically, fcntl(soc, F_SETFL, O_NONBLOCK) is incorrect since it clobbers all other file flags. Generally one gets away with it since the other flags (O_APPEND for example) don't really apply much to sockets. In a similarly rough vein, you would use fcntl(soc, F_SETFL, 0) to go back to blocking mode.
To do it right, use F_GETFL to get the current flags, set or clear the O_NONBLOCK flag, then use F_SETFL to set the flags."
Так вот, делаю я к примеру:
flags = fcntl(soc, F_GETFL);
Как мне к flags добавить или убрать O_NONBLOCK ?