In C++11 the signal.h header has no kill function

I just tried compiling code that I wrote a while ago using Gnu g++ in C++11 mode, to see if the code will need reworking anytime soon (I also plan to test it in C++17 mode for the same reason).

I found that the kill() function caused a compiler error and it seems that the kill function no longer exists in the signal.h header.

I just looked at http://www.cplusplus.com/reference/csignal/ as a reference which seems to confirm this is not just a Gnu-specific omission, but seems to be in the standard.

I can't find a rationale for this omission anywhere, nor can I find any proposal for how I should manage processes without it. Can anyone point me in the right direction?