（7）系统 POSIX 选项POSIX.1 选项值
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POSIX.4 选项值
- _SC_ASYNCHRONOUS_IO
- _SC_MAPPED_FILES
- _SC_MEMLOCK
- _SC_MEMLOCK_RANGE
- _SC_MEMORY_PROTECTION
- _SC_MESSAGE_PASSING
- _SC_PRIORITIZED_IO
- _SC_PRIORITY_SCHEDULING
- _SC_REALTIME_SIGNALS
- _SC_SEMAPHORES
- _SC_FSYNC
- _SC_SHARED_MEMORY_OBJECTS
- _SC_SYNCHRONIZED_IO
- _SC_TIMERS
- _SC_AIO_LIST_IO_MAX
- _SC_AIO_MAX
- _SC_AIO_PRIO_DELTA_MAX
- _SC_DELAYTIMER_MAX
- _SC_MQ_OPEN_MAX
- _SC_MQ_PRIO_MAX
- _SC_PAGESIZE
- _SC_RTSIG_MAX
- _SC_SEM_NSEMS_MAX
- _SC_SEM_VALUE_MAX
- _SC_SIGQUEUE_MAX
- _SC_TIMER_MAX