POSIX conformance is worth more than POSIX compliance
POSIX conformance is what real-time embedded developers are usually looking for. POSIX conformance means that the POSIX.1 standard is supported in its entirety.
In the case of the LynxOS real-time operating system, the routines of the POSIX.1b and POSIX.1c subsets are also supported.
preview:
http://www.lynuxworks.com/products/posix/posix.php3
10/14/2002