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If I have a process that receives signals from other processes, is there a way for me to somehow tell which process (if any) sent a signal?
strace lets me trace which signals a process has received, but doesn’t allow me to trace who issued them.
Ptracecan be used to detect sender too. There is anptrace(GETSIGINFO)call, which will give a debugger a chance to read (and, possibly, change)siginto_tstruct.