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	200809L	†
_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	200809L	`CONFIG_POSIX_FSYNC`
_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	200809L	`CONFIG_POSIX_PRIORITY_SCHEDULING`
_POSIX_RAW_SOCKETS	200809L	`CONFIG_NET_SOCKETS_PACKET`
_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_ATTR_STACKSIZE	200809L	`CONFIG_PTHREAD`
_POSIX_THREAD_CPUTIME	-1
_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	200809L	`CONFIG_POSIX_FSYNC`
_POSIX_THREAD_ATTR_STACKADDR	200809L	`CONFIG_PTHREAD`
_POSIX_THREAD_ATTR_STACKSIZE	200809L	`CONFIG_PTHREAD`
_POSIX_THREAD_PROCESS_SHARED	-1