SIGPOLL (SIGIO) problem: interrupt while executing a handler?

It's very hard to create a solid system the way you're trying to. Instead of signals, learn to use blocking call models, and I/O multiplexing with select() or poll().

It's very hard to create a solid system the way you're trying to. Instead of signals, learn to use blocking call models, and I/O multiplexing with select() or poll(). If you intend to use signals no matter what, try to reduce the code in the signal handler to a minimum -- maybe just sending a byte down a pipe to wake up a sleeping thread or process, or whatever.

Thank you very much, I understand your explanation and it looks good, but unfortunately, I have to use SIGPOLL (the choice isn't mine). I still do need to know the flag. – Jary Mar 10 at 3:03.

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