POSIX compliance for Solaris 8 and Linux Redhat 8.0

[Au, Worpan]

Title: POSIX compliance for Solaris 8 and Linux Redhat 8.0

        Hi,
        I am trying to find out whether the two OS (Solaris 8 and Redhat 8.0) are POSIX compliance.
        Can you give me a couple of pointers whether Solaris 8 and Linux Redhat 8.0 are POSIX compliance???
       
                Thanks in Advance.
                Worpan