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POSIX Conformance

As per IEEE 1003.1-2017, this section details Zephyr's POSIX conformance.

Note

As per POSIX 1003.13, single process mode is supported directly by both PSE51 and PSE52 profiles. While Zephyr includes support for many features found in PSE53, PSE53 itself requires supporting multiple processes. Since supporting multiple processes is beyond the scope of Zephyr's current design, some features requiring multi-process capabilities may exhibit undefined behaviour, which we denote with the † (obelus) symbol.

Note

Features listed in various POSIX Options or Option Groups may be provided in whole or in part by a conformant C library implementation. This includes (but is not limited to) POSIX Extensions to the ISO C Standard (CX).

POSIX System Interfaces

POSIX System Interfaces
Symbol Support Remarks
_POSIX_CHOWN_RESTRICTED 0  
_POSIX_NO_TRUNC 0  
_POSIX_VDISABLE 0  
POSIX System Interfaces
Symbol Support Remarks
_POSIX_JOB_CONTROL -1 :ref:`†<posix_undefined_behaviour>`
_POSIX_REGEXP -1 :ref:`†<posix_undefined_behaviour>`
_POSIX_SAVED_IDS -1 :ref:`†<posix_undefined_behaviour>`
_POSIX_SHELL -1 :ref:`†<posix_undefined_behaviour>`
POSIX System Interfaces
Symbol Support Remarks
_POSIX_VERSION 200809L  
_POSIX_ASYNCHRONOUS_IO -1 :ref:`†<posix_undefined_behaviour>`
:ref:`_POSIX_BARRIERS<posix_option_group_barriers>` 200809L :kconfig:option:`CONFIG_PTHREAD_BARRIER`
:ref:`_POSIX_CLOCK_SELECTION<posix_option_group_clock_selection>` 200809L :kconfig:option:`CONFIG_POSIX_CLOCK`
_POSIX_MAPPED_FILES -1 :ref:`†<posix_undefined_behaviour>`
_POSIX_MEMORY_PROTECTION -1 :ref:`†<posix_undefined_behaviour>`
:ref:`_POSIX_READER_WRITER_LOCKS<posix_option_reader_writer_locks>` 200809L :kconfig:option:`CONFIG_PTHREAD_IPC`
_POSIX_REALTIME_SIGNALS -1 :ref:`†<posix_undefined_behaviour>`
:ref:`_POSIX_SEMAPHORES<posix_option_group_semaphores>` 200809L :kconfig:option:`CONFIG_PTHREAD_IPC`
:ref:`_POSIX_SPIN_LOCKS<posix_option_group_spin_locks>` 200809L :kconfig:option:`CONFIG_PTHREAD_SPINLOCK`
:ref:`_POSIX_THREAD_SAFE_FUNCTIONS<posix_thread_safe_functions>` -1  
:ref:`_POSIX_THREADS<posix_option_group_threads_base>` -1 :kconfig:option:`CONFIG_PTHREAD_IPC`
:ref:`_POSIX_TIMEOUTS<posix_option_timeouts>` 200809L :kconfig:option:`CONFIG_PTHREAD_IPC`
:ref:`_POSIX_TIMERS<posix_option_group_timers>` 200809L :kconfig:option:`CONFIG_POSIX_CLOCK`
_POSIX2_C_BIND 200809L  
POSIX System Interfaces (Optional)
Symbol Support Remarks
_POSIX_ADVISORY_INFO -1  
_POSIX_CPUTIME -1  
_POSIX_FSYNC -1  
_POSIX_IPV6 200809L :kconfig:option:`CONFIG_NET_IPV6`
_POSIX_MEMLOCK -1  
_POSIX_MEMLOCK_RANGE -1  
:ref:`_POSIX_MESSAGE_PASSING<posix_option_message_passing>` 200809L :kconfig:option:`CONFIG_POSIX_MQUEUE`
_POSIX_MONOTONIC_CLOCK 200809L :kconfig:option:`CONFIG_POSIX_CLOCK`
_POSIX_PRIORITIZED_IO -1  
:ref:`_POSIX_PRIORITY_SCHEDULING<posix_option_priority_scheduling>` -1 :kconfig:option:`CONFIG_POSIX_PRIORITY_SCHEDULING` (will fail with ENOSYS:ref:`†<posix_undefined_behaviour>`)
_POSIX_RAW_SOCKETS 200809L :kconfig:option:`CONFIG_NET_SOCKETS`
_POSIX_SHARED_MEMORY_OBJECTS -1  
_POSIX_SPAWN -1  
_POSIX_SPORADIC_SERVER -1  
_POSIX_SYNCHRONIZED_IO -1  
:ref:`_POSIX_THREAD_ATTR_STACKADDR<posix_option_thread_attr_stackaddr>` 200809L :kconfig:option:`CONFIG_PTHREAD`
_POSIX_THREAD_CPUTIME -1  
:ref:`_POSIX_THREAD_ATTR_STACKSIZE<posix_option_thread_attr_stacksize>` 200809L :kconfig:option:`CONFIG_PTHREAD`
_POSIX_THREAD_PRIO_INHERIT 200809L :kconfig:option:`CONFIG_PTHREAD_MUTEX`
_POSIX_THREAD_PRIO_PROTECT -1  
:ref:`_POSIX_THREAD_PRIORITY_SCHEDULING<posix_option_thread_priority_scheduling>` 200809L :kconfig:option:`CONFIG_PTHREAD`
_POSIX_THREAD_PROCESS_SHARED -1  
_POSIX_THREAD_SPORADIC_SERVER -1  
_POSIX_TRACE -1  
_POSIX_TRACE_EVENT_FILTER -1  
_POSIX_TRACE_INHERIT -1  
_POSIX_TRACE_LOG -1  
_POSIX_TYPED_MEMORY_OBJECTS -1  
_XOPEN_CRYPT -1  
_XOPEN_REALTIME -1  
_XOPEN_REALTIME_THREADS -1  
:ref:`_XOPEN_STREAMS<posix_option_xopen_streams>` -1 :ref:`†<posix_undefined_behaviour>`
_XOPEN_UNIX -1  

POSIX Shell and Utilities

Zephyr does not support a POSIX shell or utilities at this time.

POSIX Shell and Utilities
Symbol Support Remarks
_POSIX2_C_DEV -1 :ref:`†<posix_undefined_behaviour>`
_POSIX2_CHAR_TERM -1 :ref:`†<posix_undefined_behaviour>`
_POSIX2_FORT_DEV -1 :ref:`†<posix_undefined_behaviour>`
_POSIX2_FORT_RUN -1 :ref:`†<posix_undefined_behaviour>`
_POSIX2_LOCALEDEF -1 :ref:`†<posix_undefined_behaviour>`
_POSIX2_PBS -1 :ref:`†<posix_undefined_behaviour>`
_POSIX2_PBS_ACCOUNTING -1 :ref:`†<posix_undefined_behaviour>`
_POSIX2_PBS_LOCATE -1 :ref:`†<posix_undefined_behaviour>`
_POSIX2_PBS_MESSAGE -1 :ref:`†<posix_undefined_behaviour>`
_POSIX2_PBS_TRACK -1 :ref:`†<posix_undefined_behaviour>`
_POSIX2_SW_DEV -1 :ref:`†<posix_undefined_behaviour>`
_POSIX2_UPE -1 :ref:`†<posix_undefined_behaviour>`
_POSIX2_UNIX -1 :ref:`†<posix_undefined_behaviour>`
_POSIX2_UUCP -1 :ref:`†<posix_undefined_behaviour>`

XSI Conformance

XSI System Interfaces

XSI System Interfaces
Symbol Support Remarks
_POSIX_FSYNC -1 :ref:`†<posix_undefined_behaviour>`
:ref:`_POSIX_THREAD_ATTR_STACKADDR<posix_option_thread_attr_stackaddr>` 200809L :kconfig:option:`CONFIG_PTHREAD`
:ref:`_POSIX_THREAD_ATTR_STACKSIZE<posix_option_thread_attr_stacksize>` 200809L :kconfig:option:`CONFIG_PTHREAD`
_POSIX_THREAD_PROCESS_SHARED -1