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I'm reverse engineering an ARM64 Golang binary built with musl and I've already detected kill -10,12,15 pid as the signals which interact with it, where 10 and 12 represent user-defined signals. I think there must be other signals as well and I wish to detect them. In particular, may there be other user-defined signals or only 2 SIGUSRs are available no matter what? Since signals are being sent to the binary during runtime I wanted to know if there are signature functions in Golang's runtime that may be imported in the binary and represent signal handling functionalities in the binary.

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Traditionally only two signals are reserved for users - SIGUSR1 and SIGUSR2. But there are possibilities for others as well as mentioned here.

I would check if the signals SIGUSR1 and SIGUSR2 does anything besides the obvious, like maybe call other subroutines.

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