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I have a piece of software running on a 64 bit Cent 5.8 Final box, kernel 2.6.18. This piece of software using fork and vfork. Recently some failures occurred, and in my logging I can see that fork or vfork failed, emitting a return code of -1. Cool, everything one would expect after a system call failure.

The interesting part is the errno that is logged. Because it is errno 513. I was under the impression that the highest errno was 131. Does anyone know how this is possible? Any insight into this issue would be extremely helpful.

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    I would contact the software author first. Clearly it's doing something wrong.
    – Michael Hampton
    Dec 6, 2013 at 21:18
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    Is this the error you see after tracing the process or what gets returned back?
    – Matthew Ife
    Dec 6, 2013 at 21:19
  • @MichaelHampton I first contacted an engineer at the company that makes the software. He said to me the error was a result of an out of bounds error because the errno returned to the caller was 513.
    – kmarks2
    Dec 9, 2013 at 14:07
  • @MIfe I saw the error in logging for the software that calls fork/vfork. When it fails, it simply states the failing process (fork) and the errno (513).
    – kmarks2
    Dec 9, 2013 at 14:12

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