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Cc: freebsd-questions@freebsd.org
Subject: Re: Calling syscalls through int 0x80 documentation?
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> Lack of documentation causes me to ask this kind of question here.

http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/x86.html

Have you looked at the documentation there?
Has a section on system calls and return values.