consider $SIG{CHLD} = 'IGNORE', which indeed avoids both ending the loop and zombies. Search for reaper and IGNORE.

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As you said you need IO::Socket below:

Possibly IO::Socket gets irritated by some %SIG handlers (couldn't find anything on the quick in the source or docs though). 2 possible workarounds I currently see:

• perlipc: search for sigaction and SA_RESTART then read the section on EINTR directly below
• IGNORE as handler and place the 'rc' into a file in the child, then in the mainloop regularly waitpid over the children and check for possible rc files from children died with rc!=0. Missing 'rc' and missing child is indicating a more severe error.

Seems a known issue: SOLVED: Re: TCP Client-Server: Server exits though it shouldn't loops forever, and retries accept in case of EINTR. But the loop in the reaper looks like it can stop early; and other syscalls may mess up the detection of EINTR, which seems quite far away from the interrupted syscall.

Maybe just retry accept() upto n times in a row if $client is false.

Note that's there's a small race of the parent running w/o SIG handler, and later children possibly running with it (if it's inheritable by fork; CHECKED: doesn't seem to be inherited)

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