4 ms·

> it's not safe to do anything more complex than setting a flag Though I generally agree with the sentiment, there are other limited but still useful things yo

> it's not safe to do anything more complex than setting a flag Though I generally agree with the sentiment, there are other limited but still useful things you can do, for example write() is allowed: const char msg[] = "\ncaught signal, finishing..\n"; write(2, msg, sizeof(msg)); // 1 == stdout, 2 == stderr

nimish 3y ago
Which is how the infamous self-pipe trick works: https://cr.yp.to/docs/selfpipe.html https://cr.yp.to/docs/selfpipe.html Nowadays signalfd and pidfd are the better options.
scottlamb 3y ago
write is async signal-safe, but you should save errno before the write and restore it afterward...