POSIX Option and Option Group Details

POSIX Option Groups

POSIX_BARRIERS

Enable this option group with CONFIG_POSIX_BARRIERS.

POSIX_BARRIERS

API

Supported

pthread_barrier_destroy()

yes

pthread_barrier_init()

yes

pthread_barrier_wait()

yes

pthread_barrierattr_destroy()

yes

pthread_barrierattr_init()

yes

POSIX_C_LANG_JUMP

The POSIX_C_LANG_JUMP Option Group is included in the ISO C standard.

Note

When using Newlib, Picolibc, or other C libraries conforming to the ISO C Standard, the POSIX_C_LANG_JUMP Option Group is considered supported.

POSIX_C_LANG_JUMP

API

Supported

setjmp()

yes

longjmp()

yes

POSIX_C_LANG_MATH

The POSIX_C_LANG_MATH Option Group is included in the ISO C standard.

Note

When using Newlib, Picolibc, or other C libraries conforming to the ISO C Standard, the POSIX_C_LANG_MATH Option Group is considered supported.

Please refer to Subprofiling Considerations for details on the POSIX_C_LANG_MATH Option Group.

POSIX_C_LANG_SUPPORT

The POSIX_C_LANG_SUPPORT option group contains the general ISO C Library.

Note

When using Newlib, Picolibc, or other C libraries conforming to the ISO C Standard, the entire POSIX_C_LANG_SUPPORT Option Group is considered supported.

Please refer to Subprofiling Considerations for details on the POSIX_C_LANG_SUPPORT Option Group.

For more information on developing Zephyr applications in the C programming language, please refer to details.

POSIX_C_LIB_EXT

Enable this option group with CONFIG_POSIX_C_LIB_EXT.

POSIX_C_LIB_EXT

API

Supported

fnmatch()

yes

getopt()

yes

getsubopt()

optarg

yes

opterr

yes

optind

yes

optopt

yes

stpcpy()

stpncpy()

strcasecmp()

strdup()

strfmon()

strncasecmp()

yes

strndup()

strnlen()

yes

POSIX_CLOCK_SELECTION

Enable this option group with CONFIG_POSIX_CLOCK_SELECTION.

POSIX_CLOCK_SELECTION

API

Supported

pthread_condattr_getclock()

yes

pthread_condattr_setclock()

yes

clock_nanosleep()

yes

POSIX_DEVICE_IO

Enable this option group with CONFIG_POSIX_DEVICE_IO.

Note

When using Newlib, Picolibc, or other C libraries conforming to the ISO C Standard, the C89 components of the POSIX_DEVICE_IO Option Group are considered supported.

POSIX_DEVICE_IO

API

Supported

FD_CLR()

yes

FD_ISSET()

yes

FD_SET()

yes

FD_ZERO()

yes

clearerr()

yes

close()

yes

fclose()

yes

fdopen()

yes

feof()

yes

ferror()

yes

fflush()

yes

fgetc()

yes

fgets()

yes

fileno()

yes

fopen()

yes

fprintf()

yes

fputc()

yes

fputs()

yes

fread()

yes

freopen()

yes

fscanf()

yes

fwrite()

yes

getc()

yes

getchar()

yes

gets()

yes

open()

yes

perror()

yes

poll()

yes

printf()

yes

pread()

yes

pselect()

yes

putc()

yes

putchar()

yes

puts()

yes

pwrite()

yes

read()

yes

scanf()

yes

select()

yes

setbuf()

yes

setvbuf()

yes

stderr

yes

stdin

yes

stdout

yes

ungetc()

yes

vfprintf()

yes

vfscanf()

yes

vprintf()

yes

vscanf()

yes

write()

yes

POSIX_FD_MGMT

Enable this option group with CONFIG_POSIX_FD_MGMT.

POSIX_FD_MGMT

API

Supported

dup()

dup2()

fcntl()

fgetpos()

fseek()

fseeko()

fsetpos()

ftell()

ftello()

ftruncate()

yes

lseek()

rewind()

POSIX_FILE_LOCKING

POSIX_FILE_LOCKING

API

Supported

flockfile()

ftrylockfile()

funlockfile()

getc_unlocked()

getchar_unlocked()

putc_unlocked()

putchar_unlocked()

POSIX_FILE_SYSTEM

Enable this option group with CONFIG_POSIX_FILE_SYSTEM.

POSIX_FILE_SYSTEM

API

Supported

access()

chdir()

closedir()

yes

creat()

fchdir()

fpathconf()

fstat()

yes

fstatvfs()

getcwd()

link()

mkdir()

yes

mkstemp()

opendir()

yes

pathconf()

readdir()

yes

remove()

yes

rename()

yes

rewinddir()

rmdir()

yes

stat()

yes

statvfs()

tmpfile()

tmpnam()

truncate()

unlink()

yes

utime()

POSIX_FILE_SYSTEM_R

Enable this option with CONFIG_POSIX_FILE_SYSTEM_R.

POSIX_FILE_SYSTEM_R

API

Supported

readdir_r()

yes

POSIX_MAPPED_FILES

Enable this option group with CONFIG_POSIX_MAPPED_FILES.

POSIX_MAPPED_FILES

API

Supported

mmap()

yes

msync()

yes

munmap()

yes

POSIX_MEMORY_PROTECTION

Enable this option group with CONFIG_POSIX_MEMORY_PROTECTION.

POSIX_MEMORY_PROTECTION

API

Supported

mprotect()

yes †

POSIX_MULTI_PROCESS

Enable this option group with CONFIG_POSIX_MULTI_PROCESS.

POSIX_MULTI_PROCESS

API

Supported

_Exit()

yes

_exit()

yes

assert()

yes

atexit()

†

clock()

execl()

†

execle()

†

execlp()

†

execv()

†

execve()

†

execvp()

†

exit()

yes

fork()

†

getpgrp()

†

getpgid()

†

getpid()

yes †

getppid()

†

getsid()

†

setsid()

†

sleep()

yes

times()

wait()

†

waitid()

†

waitpid()

†

POSIX_NETWORKING

The function sockatmark() is not yet supported and is expected to fail setting errno to ENOSYS †.

Enable this option group with CONFIG_POSIX_NETWORKING.

POSIX_NETWORKING

API

Supported

accept()

yes

bind()

yes

connect()

yes

endhostent()

yes

endnetent()

yes

endprotoent()

yes

endservent()

yes

freeaddrinfo()

yes

gai_strerror()

yes

getaddrinfo()

yes

gethostent()

yes

gethostname()

yes

getnameinfo()

yes

getnetbyaddr()

yes

getnetbyname()

yes

getnetent()

yes

getpeername()

yes

getprotobyname()

yes

getprotobynumber()

yes

getprotoent()

yes

getservbyname()

yes

getservbyport()

yes

getservent()

yes

getsockname()

yes

getsockopt()

yes

htonl()

yes

htons()

yes

if_freenameindex()

yes

if_indextoname()

yes

if_nameindex()

yes

if_nametoindex()

yes

inet_addr()

yes

inet_ntoa()

yes

inet_ntop()

yes

inet_pton()

yes

listen()

yes

ntohl()

yes

ntohs()

yes

recv()

yes

recvfrom()

yes

recvmsg()

yes

send()

yes

sendmsg()

yes

sendto()

yes

sethostent()

yes

setnetent()

yes

setprotoent()

yes

setservent()

yes

setsockopt()

yes

shutdown()

yes

socket()

yes

sockatmark()

yes †

socketpair()

yes

POSIX_PIPE

POSIX_PIPE

API

Supported

pipe()

POSIX_REALTIME_SIGNALS

Enable this option group with CONFIG_POSIX_REALTIME_SIGNALS.

POSIX_REALTIME_SIGNALS

API

Supported

sigqueue()

sigtimedwait()

sigwaitinfo()

POSIX_SEMAPHORES

Enable this option group with CONFIG_POSIX_SEMAPHORES.

POSIX_SEMAPHORES

API

Supported

sem_close()

yes

sem_destroy()

yes

sem_getvalue()

yes

sem_init()

yes

sem_open()

yes

sem_post()

yes

sem_trywait()

yes

sem_unlink()

yes

sem_wait()

yes

POSIX_SIGNAL_JUMP

POSIX_SIGNAL_JUMP

API

Supported

siglongjmp()

sigsetjmp()

POSIX_SIGNALS

Enable this option group with CONFIG_POSIX_SIGNALS.

Note

As processes are not yet supported in Zephyr, the ISO C functions abort(), signal(), and raise(), as well as the other POSIX functions listed below, may exhibit undefined behaviour. The POSIX functions kill(), pause(), sigaction(), sigpending(), sigsuspend(), and sigwait() are implemented to ensure that conformant applications can link, but they are expected to fail, setting errno to ENOSYS †.

POSIX_SIGNALS

API

Supported

abort()

yes †

alarm()

yes †

kill()

yes †

pause()

yes †

raise()

yes †

sigaction()

yes †

sigaddset()

yes

sigdelset()

yes

sigemptyset()

yes

sigfillset()

yes

sigismember()

yes

signal()

yes †

sigpending()

yes †

sigprocmask()

yes

sigsuspend()

yes †

sigwait()

yes †

strsignal()

yes

POSIX_SINGLE_PROCESS

The POSIX_SINGLE_PROCESS option group contains services for single process applications.

Enable this option group with CONFIG_POSIX_SINGLE_PROCESS.

POSIX_SINGLE_PROCESS

API

Supported

confstr()

yes

environ

yes

errno

yes

getenv()

yes

setenv()

yes

sysconf()

yes

uname()

yes

unsetenv()

yes

POSIX_SPIN_LOCKS

Enable this option group with CONFIG_POSIX_SPIN_LOCKS.

POSIX_SPIN_LOCKS

API

Supported

pthread_spin_destroy()

yes

pthread_spin_init()

yes

pthread_spin_lock()

yes

pthread_spin_trylock()

yes

pthread_spin_unlock()

yes

POSIX_THREADS_BASE

The basic assumption in this profile is that the system consists of a single (implicit) process with multiple threads. Therefore, the standard requires all basic thread services, except those related to multiple processes.

Enable this option group with CONFIG_POSIX_THREADS.

POSIX_THREADS_BASE

API

Supported

pthread_atfork()

yes

pthread_attr_destroy()

yes

pthread_attr_getdetachstate()

yes

pthread_attr_getschedparam()

yes

pthread_attr_init()

yes

pthread_attr_setdetachstate()

yes

pthread_attr_setschedparam()

yes

pthread_barrier_destroy()

yes

pthread_barrier_init()

yes

pthread_barrier_wait()

yes

pthread_barrierattr_destroy()

yes

pthread_barrierattr_getpshared()

yes

pthread_barrierattr_init()

yes

pthread_barrierattr_setpshared()

yes

pthread_cancel()

yes

pthread_cleanup_pop()

yes

pthread_cleanup_push()

yes

pthread_cond_broadcast()

yes

pthread_cond_destroy()

yes

pthread_cond_init()

yes

pthread_cond_signal()

yes

pthread_cond_timedwait()

yes

pthread_cond_wait()

yes

pthread_condattr_destroy()

yes

pthread_condattr_init()

yes

pthread_create()

yes

pthread_detach()

yes

pthread_equal()

yes

pthread_exit()

yes

pthread_getspecific()

yes

pthread_join()

yes

pthread_key_create()

yes

pthread_key_delete()

yes

pthread_kill()

pthread_mutex_destroy()

yes

pthread_mutex_init()

yes

pthread_mutex_lock()

yes

pthread_mutex_trylock()

yes

pthread_mutex_unlock()

yes

pthread_mutexattr_destroy()

yes

pthread_mutexattr_init()

yes

pthread_once()

yes

pthread_self()

yes

pthread_setcancelstate()

yes

pthread_setcanceltype()

yes

pthread_setspecific()

yes

pthread_sigmask()

yes

pthread_testcancel()

yes

POSIX_THREADS_EXT

Enable this option group with CONFIG_POSIX_THREADS_EXT.

POSIX_THREADS_EXT

API

Supported

pthread_attr_getguardsize()

yes

pthread_attr_setguardsize()

yes

pthread_mutexattr_gettype()

yes

pthread_mutexattr_settype()

yes

POSIX_TIMERS

Enable this option group with CONFIG_POSIX_TIMERS.

POSIX_TIMERS

API

Supported

clock_getres()

yes

clock_gettime()

yes

clock_settime()

yes

nanosleep()

yes

timer_create()

yes

timer_delete()

yes

timer_gettime()

yes

timer_getoverrun()

yes

timer_settime()

yes

XSI_SYSTEM_LOGGING

Enable this option group with CONFIG_XSI_SYSTEM_LOGGING.

XSI_SYSTEM_LOGGING

API

Supported

closelog()

yes

openlog()

yes

setlogmask()

yes

syslog()

yes

XSI_THREADS_EXT

The XSI_THREADS_EXT option group is required because it provides functions to control a thread’s stack. This is considered useful for any real-time application.

Enable this option group with CONFIG_XSI_THREADS_EXT.

XSI_THREADS_EXT

API

Supported

pthread_attr_getstack()

yes

pthread_attr_setstack()

yes

pthread_getconcurrency()

yes

pthread_setconcurrency()

yes

POSIX Options

_POSIX_ASYNCHRONOUS_IO

Functions part of the _POSIX_ASYNCHRONOUS_IO Option are not implemented in Zephyr but are provided so that conformant applications can still link. These functions will fail, setting errno to ENOSYS†.

Enable this option with CONFIG_POSIX_ASYNCHRONOUS_IO.

_POSIX_ASYNCHRONOUS_IO

API

Supported

aio_cancel()

yes †

aio_error()

yes †

aio_fsync()

yes †

aio_read()

yes †

aio_return()

yes †

aio_suspend()

yes †

aio_write()

yes †

lio_listio()

yes †

_POSIX_CPUTIME

Enable this option with CONFIG_POSIX_CPUTIME.

_POSIX_CPUTIME

API

Supported

CLOCK_PROCESS_CPUTIME_ID

yes

_POSIX_FSYNC

Enable this option with CONFIG_POSIX_FSYNC.

_POSIX_FSYNC

API

Supported

fsync()

yes

_POSIX_IPV6

Internet Protocol Version 6 is supported.

For more information, please refer to Networking.

Enable this option with CONFIG_POSIX_IPV6.

_POSIX_MEMLOCK

Zephyr’s Demand Paging API does not yet support pinning or unpinning all virtual memory regions. The functions below are expected to fail and set errno to ENOSYS †.

Enable this option with CONFIG_POSIX_MEMLOCK.

_POSIX_MEMLOCK

API

Supported

mlockall()

yes

munlockall()

yes

_POSIX_MEMLOCK_RANGE

Enable this option with CONFIG_POSIX_MEMLOCK_RANGE.

_POSIX_MEMLOCK_RANGE

API

Supported

mlock()

yes

munlock()

yes

_POSIX_MESSAGE_PASSING

Enable this option with CONFIG_POSIX_MESSAGE_PASSING.

_POSIX_MESSAGE_PASSING

API

Supported

mq_close()

yes

mq_getattr()

yes

mq_notify()

yes

mq_open()

yes

mq_receive()

yes

mq_send()

yes

mq_setattr()

yes

mq_unlink()

yes

_POSIX_MONOTONIC_CLOCK

Enable this option with CONFIG_POSIX_MONOTONIC_CLOCK.

_POSIX_MONOTONIC_CLOCK

API

Supported

CLOCK_MONOTONIC

yes

_POSIX_PRIORITY_SCHEDULING

As processes are not yet supported in Zephyr, the functions sched_rr_get_interval(), sched_setparam(), and sched_setscheduler() are expected to fail setting errno to ENOSYS†.

Enable this option with CONFIG_POSIX_PRIORITY_SCHEDULING.

_POSIX_PRIORITY_SCHEDULING

API

Supported

sched_get_priority_max()

yes

sched_get_priority_min()

yes

sched_getparam()

yes

sched_getscheduler()

yes

sched_rr_get_interval()

yes †

sched_setparam()

yes †

sched_setscheduler()

yes †

sched_yield()

yes

_POSIX_RAW_SOCKETS

Raw sockets are supported.

For more information, please refer to CONFIG_NET_SOCKETS_PACKET.

Enable this option with CONFIG_POSIX_RAW_SOCKETS.

_POSIX_READER_WRITER_LOCKS

Enable this option with CONFIG_POSIX_READER_WRITER_LOCKS.

_POSIX_READER_WRITER_LOCKS

API

Supported

pthread_rwlock_destroy()

yes

pthread_rwlock_init()

yes

pthread_rwlock_rdlock()

yes

pthread_rwlock_tryrdlock()

yes

pthread_rwlock_trywrlock()

yes

pthread_rwlock_unlock()

yes

pthread_rwlock_wrlock()

yes

pthread_rwlockattr_destroy()

yes

pthread_rwlockattr_getpshared()

yes

pthread_rwlockattr_init()

yes

pthread_rwlockattr_setpshared()

yes

_POSIX_SHARED_MEMORY_OBJECTS

Enable this option with CONFIG_POSIX_SHARED_MEMORY_OBJECTS.

_POSIX_SHARED_MEMORY_OBJECTS

API

Supported

mmap()

yes

munmap()

yes

shm_open()

yes

shm_unlink()

yes

_POSIX_SYNCHRONIZED_IO

Enable this option with CONFIG_POSIX_SYNCHRONIZED_IO.

_POSIX_SYNCHRONIZED_IO

API

Supported

fdatasync()

yes

fsync()

yes

msync()

yes

_POSIX_THREAD_ATTR_STACKADDR

Enable this option with CONFIG_POSIX_THREAD_ATTR_STACKADDR.

_POSIX_THREAD_ATTR_STACKADDR

API

Supported

pthread_attr_getstackaddr()

yes

pthread_attr_setstackaddr()

yes

_POSIX_THREAD_ATTR_STACKSIZE

Enable this option with CONFIG_POSIX_THREAD_ATTR_STACKSIZE.

_POSIX_THREAD_ATTR_STACKSIZE

API

Supported

pthread_attr_getstacksize()

yes

pthread_attr_setstacksize()

yes

_POSIX_THREAD_CPUTIME

Enable this option with CONFIG_POSIX_THREAD_CPUTIME.

_POSIX_THREAD_CPUTIME

API

Supported

CLOCK_THREAD_CPUTIME_ID

yes

pthread_getcpuclockid()

yes

_POSIX_THREAD_PRIO_INHERIT

Enable this option with CONFIG_POSIX_THREAD_PRIO_INHERIT.

_POSIX_THREAD_PRIO_INHERIT

API

Supported

pthread_mutexattr_getprotocol()

yes

pthread_mutexattr_setprotocol()

yes

_POSIX_THREAD_PRIO_PROTECT

Enable this option with CONFIG_POSIX_THREAD_PRIO_PROTECT.

_POSIX_THREAD_PRIO_PROTECT

API

Supported

pthread_mutex_getprioceiling()

yes

pthread_mutex_setprioceiling()

yes

pthread_mutexattr_getprioceiling()

yes

pthread_mutexattr_getprotocol()

yes

pthread_mutexattr_setprioceiling()

yes

pthread_mutexattr_setprotocol()

yes

_POSIX_THREAD_PRIORITY_SCHEDULING

Enable this option with CONFIG_POSIX_THREAD_PRIORITY_SCHEDULING.

_POSIX_THREAD_PRIORITY_SCHEDULING

API

Supported

pthread_attr_getinheritsched()

yes

pthread_attr_getschedpolicy()

yes

pthread_attr_getscope()

yes

pthread_attr_setinheritsched()

yes

pthread_attr_setschedpolicy()

yes

pthread_attr_setscope()

yes

pthread_getschedparam()

yes

pthread_setschedparam()

yes

pthread_setschedprio()

yes

_POSIX_THREAD_SAFE_FUNCTIONS

Enable this option with CONFIG_POSIX_THREAD_SAFE_FUNCTIONS.

_POSIX_THREAD_SAFE_FUNCTIONS

API

Supported

asctime_r()

yes

ctime_r()

yes (UTC timezone only)

flockfile()

ftrylockfile()

funlockfile()

getc_unlocked()

getchar_unlocked()

getgrgid_r()

yes †

getgrnam_r()

yes †

getpwnam_r()

yes †

getpwuid_r()

yes †

gmtime_r()

yes

localtime_r()

yes (UTC timezone only)

putc_unlocked()

putchar_unlocked()

rand_r()

yes

readdir_r()

yes

strerror_r()

yes

strtok_r()

yes

_POSIX_TIMEOUTS

Enable this option with CONFIG_POSIX_TIMEOUTS.

_POSIX_TIMEOUTS

API

Supported

mq_timedreceive()

yes

mq_timedsend()

yes

pthread_mutex_timedlock()

yes

pthread_rwlock_timedrdlock()

yes

pthread_rwlock_timedwrlock()

yes

sem_timedwait()

yes

posix_trace_timedgetnext_event()

_XOPEN_STREAMS

With the exception of ioctl(), functions in the _XOPEN_STREAMS option group are not implemented in Zephyr but are provided so that conformant applications can still link. Unimplemented functions in this option group will fail, setting errno to ENOSYS †.

Enable this option with CONFIG_XOPEN_STREAMS.

_XOPEN_STREAMS

API

Supported

fattach()

yes †

fdetach()

yes †

getmsg()

yes †

getpmsg()

yes †

ioctl()

yes

isastream()

yes †

putmsg()

yes †

putpmsg()

yes †