XSI-conformant systems always support the functionality associated with this symbol. XSI-conformant systems always support the functionality associated with this symbol. Implementation supports the Process Memory Locking option. Implementation supports the Memory Protection option. XSI-conformant systems always support the functionality associated with this symbol.
Implementation supports the Message Passing option.
Implementation supports the Prioritized Input and Output option. Implementation supports the Semaphores option. Implementation supports the Shared Memory Objects option. Otherwise it will be undefined. Legacy The Legacy Feature Group includes the interfaces and headers which were mandatory in previous versions of this specification but are optional in this version of the specification.