See system for how the error code of programs is arranged.

Your program used exit(60);. Lots of programs exit with the errno of the error as the exit code. On one of my systems, errno 60 is "Device not a stream". 

$ perl -E'say $!=60'
Device not a stream

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Update: Added examination of error code.

In reply to Re: Error code 15360 on close filehandle by ikegami
in thread Error code 15360 on close filehandle by perlnew1611

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