POSIX Conformance

For a system to be given a certificate of POSIX.1 conformance, it must meet the following requirements:

• The system must support all of the interfaces as defined in the ISO/IEC 9945-1.
• The vendor must supply a POSIX.1 Conformance Document (PCD) with the vendor's implementation as specified in ISP/IEC 9945-1.
• The implementation must pass the appropriate National Institute of Standards and Technology (NIST) test suite.

Windows NT version 3.1 Workstation and Windows NT Server have been tested using the official NIST PCTS for Federal Information Processing Standard (FIPS) 151-2 and NIST has validated the test results. Windows NT version 3.5 is in the process of being verified for POSIX.1 compliance and will also be submitted to NIST for FIPS 151-2 certification. FIPS 151-2 incorporates POSIX.1 as a reference standard and also requires a number of the optional features defined in POSIX.1 to promote application portability among conforming implementations. An implementation that conforms to FIPS 151-2 also conforms to POSIX.1. Note that conformance is specific to the manufacturer, hardware platform, and model number on which the implementation is tested.

POSIX.1 is a source-level standard; it does not provide any binary compatibility.