There are no options defined
| NGROUPS_MAX | Supplementary Groups options option |
| _POSIX_ASYNCHRONOUS_IO | Asynchronous Input and Output option |
| _POSIX_CHOWN_RESTRICTED | Change File Owner Restriction option |
| _POSIX_FSYNC | File Synchronization option |
| _POSIX_JOB_CONTROL | Job Control option |
| _POSIX_MAPPED_FILES | Memory Mapped Files option |
| _POSIX_MEMLOCK | Process Memory Locking option |
| _POSIX_MEMLOCK_RANGE | Range Memory Locking option |
| _POSIX_MEMORY_PROTECTION | Memory Protection option |
| _POSIX_MESSAGE_PASSING | Message Passing option |
| _POSIX_PRIORITY_SCHEDULING | Process Scheduling option |
| _POSIX_REALTIME_SIGNALS | Realtime Signals Extension |
| _POSIX_SEMAPHORES | Semaphores option |
| _POSIX_SHARED_MEMORY_OBJECTS | Shared Memory Objects option |
| _POSIX_SYNCHRONIZED_IO | Synchronized Input and Output option |
| _POSIX_TIMERS | Timers option |
| _POSIX_THREAD_PRIO_INHERIT | Priority Inheritance option |
| _POSIX_THREAD_PRIORITY_SCHEDULING | Thread Execution Scheduling option |
| _POSIX_THREADS | Threads option |
| _POSIX_THREAD_SAFE_FUNCTIONS | Thread-Safe Functions option |
| POSIX2_UPE | User Portability Utilities are usually required except for systems that support little or no interactive time sharing work. |
| POSIX2_SW_DEV | Software Development Utilities (section 6) usually required becasue of make and ar. |
| POSIX2_C_BIND | C-Language Binding Option supports the functions in Annex B, notably system() and popen(). |
| POSIX2_C_DEV | C-languge DevelopmentUtilities supports the functions in annex A, notably c89, lex, and yacc. |
| POSIX2_FORT_DEV | FORTRAN Development Utilities in Annex C support developing or installinf FORTRAN application from source. |
| POSIX2_FORT_RUN | FORTRAN Runtime Utility needed mostly for the asa utility. |
| POSIX2_LOCALEDEF | applications can provide their own locale definition files. |
| POSIX2_CHAR_TERM | Character Terminal option required by all systems that support a least one terminal type capable of all the operations in this standard. Developed solely to allow the bypass the requirement for gereral purpose asynchronous terminal support. |
| POSIX2_PBS | Batch Environment (the overall option). The system must support all the mandatory parts, but the following options within Batch may be additionally be supported. |
| POSIX2_PBS_ACCOUNTING | Batch Accounting |
| POSIX2_PBS_CHECKPOINT | Batch Checkpoint/Restart |
| POSIX2_PBS_LOCATE | Batch Locate Job Request |
| POSIX2_PBS_MESSAGE | Batch Message allows the sending of messages to batch jobs. |
| POSIX2_PBS_TRACK | Batch Tracking of Jobs |
| Asynchronous I/O |
| Change Owner Restriction |
| Filename Truncation |
| File Synchronization |
| Job Control |
| Memory Mapped Files |
| Memory Locking |
| Memory Range Locking |
| Memory Protection |
| Message Queues |
| Mutex Priority Ceiling |
| Mutexes |
| Prioritized I/O |
| Priority Process Scheduling |
| Priority Task Scheduling |
| Process Shared |
| Realtime Signals |
| Saved IDs |
| Semaphores |
| Shared Memory Objects |
| Synchronized I/O |
| Timers |
| Synchronized_IO_Is_Supported |
| Asynchronous_IO_Is_Supported |
| Prioritized_IO_Is_Supported |
| POSIX_SUPER_ADA | Ada Language and Bindings |
| POSIX_SUPER_F90 | Fortran 90 Language Compiler |
| POSIX_SUPER_DIRNAME | X.500 Directory Services |
| POSIX_SUPER_ISO1001 | ISO Labeled magnetic Tapes |
1) The local character set representation and the precise mappings between it and the various string syntaxes.
2) The length of the longest string that the om_get operation will return. This number is no less than 1024 octets.
3) Whether the service reports an exception if an object supplied to it as an argument is not minimally consistent.
4) Whether the interface operations are atomic.
1) The circumstances that define abnormal termination of a session.
2) The features of a session that the mx_open operation supplies as defaults.
3) Whether the service will accept any circumstances as causes of temporary delivery failure.
4) The maximum number of users that may be assigned to a single delivery queue.
5) The maximum number of sessions that may exist simultaneously.
6) Which qualifying object in the delivery or input que the ma_start_delivery or mt_start_transfer_in operation selects for delivery or transfer in.
7) Which and how many sessions the mx_wait operation notifies of the arrival of an object when several sessions provide access to a delivery, retrieval, or input queue.
| Asynchronous in a Context object. |
| File-Descriptor in a Session object. |
| The Basic Directory Contents Package |
| The Strong Authentication Package |
| The MHS Directory User Package |