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	†
_POSIX_REGEXP	-1	†
_POSIX_SAVED_IDS	-1	†
_POSIX_SHELL	-1	†

POSIX System Interfaces

Symbol	Support	Remarks
_POSIX_VERSION	200809L
_POSIX_ASYNCHRONOUS_IO	-1	†
_POSIX_BARRIERS	200809L	CONFIG_PTHREAD_BARRIER
_POSIX_CLOCK_SELECTION	200809L	CONFIG_POSIX_CLOCK
_POSIX_MAPPED_FILES	-1	†
_POSIX_MEMORY_PROTECTION	-1	†
_POSIX_READER_WRITER_LOCKS	200809L	CONFIG_PTHREAD_IPC
_POSIX_REALTIME_SIGNALS	-1	†
_POSIX_SEMAPHORES	200809L	CONFIG_PTHREAD_IPC
_POSIX_SPIN_LOCKS	200809L	CONFIG_PTHREAD_SPINLOCK
_POSIX_THREAD_SAFE_FUNCTIONS	-1
_POSIX_THREADS	-1	CONFIG_PTHREAD_IPC
_POSIX_TIMEOUTS	200809L	CONFIG_PTHREAD_IPC
_POSIX_TIMERS	200809L	CONFIG_POSIX_CLOCK
_POSIX2_C_BIND	200809L

POSIX System Interfaces (Optional)

Symbol	Support	Remarks
_POSIX_ADVISORY_INFO	-1
_POSIX_CPUTIME	200809L	CONFIG_POSIX_CLOCK
_POSIX_FSYNC	-1
_POSIX_IPV6	200809L	CONFIG_NET_IPV6
_POSIX_MEMLOCK	-1
_POSIX_MEMLOCK_RANGE	-1
_POSIX_MESSAGE_PASSING	200809L	CONFIG_POSIX_MQUEUE
_POSIX_MONOTONIC_CLOCK	200809L	CONFIG_POSIX_CLOCK
_POSIX_PRIORITIZED_IO	-1
_POSIX_PRIORITY_SCHEDULING	-1	CONFIG_POSIX_PRIORITY_SCHEDULING (will fail with ENOSYS†)
_POSIX_RAW_SOCKETS	200809L	CONFIG_NET_SOCKETS
_POSIX_SHARED_MEMORY_OBJECTS	-1
_POSIX_SPAWN	-1
_POSIX_SPORADIC_SERVER	-1
_POSIX_SYNCHRONIZED_IO	-1
_POSIX_THREAD_ATTR_STACKADDR	200809L	CONFIG_PTHREAD
_POSIX_THREAD_CPUTIME	-1
_POSIX_THREAD_ATTR_STACKSIZE	200809L	CONFIG_PTHREAD
_POSIX_THREAD_PRIO_INHERIT	200809L	CONFIG_PTHREAD_MUTEX
_POSIX_THREAD_PRIO_PROTECT	-1
_POSIX_THREAD_PRIORITY_SCHEDULING	200809L	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
_XOPEN_STREAMS	-1	†
_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	†
_POSIX2_CHAR_TERM	-1	†
_POSIX2_FORT_DEV	-1	†
_POSIX2_FORT_RUN	-1	†
_POSIX2_LOCALEDEF	-1	†
_POSIX2_PBS	-1	†
_POSIX2_PBS_ACCOUNTING	-1	†
_POSIX2_PBS_LOCATE	-1	†
_POSIX2_PBS_MESSAGE	-1	†
_POSIX2_PBS_TRACK	-1	†
_POSIX2_SW_DEV	-1	†
_POSIX2_UPE	-1	†
_POSIX2_UNIX	-1	†
_POSIX2_UUCP	-1	†

XSI Conformance

XSI System Interfaces

XSI System Interfaces

Symbol	Support	Remarks
_POSIX_FSYNC	-1	†
_POSIX_THREAD_ATTR_STACKADDR	200809L	CONFIG_PTHREAD
_POSIX_THREAD_ATTR_STACKSIZE	200809L	CONFIG_PTHREAD
_POSIX_THREAD_PROCESS_SHARED	-1