using fork with pcntl_signal/pcntl_alarm

[henzeb]

When using Fork together with pcntl calls like pcntl_signal (SIGTERM/SIGINT) or pcntl_alarm, I occasionally get the following error:

socket_select(): Unable to select [4]: Interrupted system call

This is a known issue and the common solution is to check for this error and retry again.

[freekmurze]

Feel free to PR improvements.