in reply to Re: No child processes - system limit?
in thread No child processes - system limit?

Well, the reason I'm thinking resource limit is that this only occurs when busy, and then a couple of seconds later it works fine again.

The docs for select indicate that this is the select(2) system call, but the docs for that say the following:

...On error, -1 is returned, and errno is set appropriately;...

and lists the following errors:
    An invalid file descriptor was given in one of the sets. (Perhaps a file descriptor that was already closed, or one on which an error has occurred.)
    A signal was caught; see signal(7).
    nfds is negative or the value contained within timeout is invalid.
    unable to allocate memory for internal tables.
... none of which correspond to the no child processes, and leaving me at a bit of a loss