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Sending SIGUSR1 to a process
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Sending SIGUSR1 to a process


  • Subject: Sending SIGUSR1 to a process
  • From: Gabriel Zachmann via Cocoa-dev <email@hidden>
  • Date: Mon, 29 Jan 2024 08:06:57 +0100

IIRC, one process cannot send a Unix signal to another one.
At least, not any more, and not without special privileges.

But would it be possible for a user to send a SIGUSR1 (using 'kill -30 <pid>'
on the command line) to a process they own?

I couldn't find information about that.
In fact, in the developer docs i couldn't find any info about Unix signals,
what is possible or not under the new security regime in macOS.
(I can't remember where i read about the new limitations regarding signals
under the new security regime.)

Any info will be highly appreciated.

Best regards, Gabriel

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