SIGUSR1: An Under-Appreciated IPC Mechanism

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Polling sucks, but inter-process communication (IPC) is hard. Sometimes you have two programs that need to coordinate, and you just want a simple way for one to tell the other “hey, new information is ready, go look at it”. Here’s a trick I picked up from xidle(1) … I’m sure other programs have used it, but this is where I got the idea. You may be familiar with UNIX…

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