notification on child process exit

[Nelson, Erik - 2]

I fork + exec child processes and I would like to get some kind of notification when they exit.  However, the nginx signal handler reaps my child processes and logs a message like

2015/05/14 14:12:24 [notice] 28033#0: signal 17 (SIGCHLD) received
2015/05/14 14:12:24 [notice] 28033#0: unknown process 28044 exited with code 1

Nginx knows that this process isn't one of its own children- is there some way I can either register interest in my child process, or get an event sent to me somehow on child exit?

FWIW, I'm using nginx-1.7.7 with the ngx_lua extension on an older RedHat server.

Thanks

Erik

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