Advanced Programming in the UNIX® Environment

ptg10805159

56 UNIX Standardization and Implementations Chapter 2

Name of option Indicates ... nameargument

_POSIX_ASYNCHRONOUS_IO whether the implementation supports _SC_ASYNCHRONOUS_IO

POSIX asynchronous I/O

_POSIX_BARRIERS whether the implementation supports _SC_BARRIERS

barriers

_POSIX_CLOCK_SELECTION whether the implementation supports _SC_CLOCK_SELECTION

clock selection

_POSIX_JOB_CONTROL whether the implementation supports _SC_JOB_CONTROL

job control

_POSIX_MAPPED_FILES whether the implementation supports _SC_MAPPED_FILES

memory-mapped files

_POSIX_MEMORY_PROTECTION whether the implementation supports _SC_MEMORY_PROTECTION

memory protection

_POSIX_READER_WRITER_LOCKS whether the implementation supports _SC_READER_WRITER_LOCKS

reader–writer locks

_POSIX_REALTIME_SIGNALS whether the implementation supports _SC_REALTIME_SIGNALS

real-time signals

_POSIX_SAVED_IDS whether the implementation supports _SC_SAVED_IDS

the saved set-user-ID and the

saved set-group-ID

_POSIX_SEMAPHORES whether the implementation supports _SC_SEMAPHORES

POSIX semaphores

_POSIX_SHELL whether the implementation supports _SC_SHELL

the POSIX shell

_POSIX_SPIN_LOCKS whether the implementation supports _SC_SPIN_LOCKS

spin locks

_POSIX_THREAD_SAFE_FUNCTIONS whether the implementation supports _SC_THREAD_SAFE_FUNCTIONS

thread-safe functions

_POSIX_THREADS whether the implementation supports _SC_THREADS

threads

_POSIX_TIMEOUTS whether the implementation supports _SC_TIMEOUTS

timeout-based variants of

selected functions

_POSIX_TIMERS whether the implementation supports _SC_TIMERS

timers

_POSIX_VERSION the POSIX.1 version _SC_VERSION

_XOPEN_CRYPT whether the implementation supports _SC_XOPEN_CRYPT

the XSI encryption option group

_XOPEN_REALTIME whether the implementation supports _SC_XOPEN_REALTIME

the XSI real-time option group

_XOPEN_REALTIME_THREADS whether the implementation supports _SC_XOPEN_REALTIME_THREADS

the XSI real-time threads option

group

_XOPEN_SHM whether the implementation supports _SC_XOPEN_SHM

the XSI shared memory option

group

_XOPEN_VERSION the XSI version _SC_XOPEN_VERSION

Figure 2.19 Options andnamearguments tosysconf