Note: A driver or module that does not export pfxdevflag is assumed to use SVR3 calling conventions at its pfxopen() and pfxclose() entry points. However, this support will be withdrawn in a release of IRIX in the very near term. If you are porting a STREAMS driver or module to IRIX you are urged to make sure it uses SVR4 conventions and exports a pfxdevflag containing at least 0.