Daniel Eklöf 863ae1143f fdm: add support for managing signals ... Add fdm_signal_add() and fdm_signal_del(). Signals added to the fdm will be monitored, and the provided callback called as “soon as possible” from the main context (i.e not from the signal handler context). Monitored signals are *blocked* by default. We use epoll_pwait() to unblock them while we’re polling. This allows us to do race-free signal detection. We use a single handler for all monitored signals; the handler simply updates the signal’s slot in a global array (sized to fit SIGRTMAX signals). When epoll_pwait() returns EINTR, we loop the global array. The callback associated with each signal that fired is called.		2021-02-11 18:55:21 +01:00
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pgo.c	fdm: add support for managing signals	2021-02-11 18:55:21 +01:00