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{{Short description|C (programming language) standard library specifically for POSIX systems}}{{C POSIX library}}The C POSIX library is a specification of a C standard library for POSIX systems. It was developed at the same time as the ANSI C standard. Some effort was made to make POSIX compatible with standard C; POSIX includes additional functions to those introduced in standard C.

C POSIX library header files

{| class="wikitable sortable"! Header file!! Description !! First released

aio.h		Asynchronous I/O>Asynchronous input and output	Issue 5

arpa/inet.h		IP addresses (part of Berkeley sockets) >| Issue 6

assert.h		| Issue 1

complex.h		C mathematical functions >| Issue 6

cpio.h		File format#Magic number>Magic numbers for the cpio archive format	Issue 3

{{tag>ctype.h|open}}|Character types|Issue 1

dirent.h		directory (file systems)>directories	Issue 2

dlfcn.h		Dynamic linker>Dynamic linking	Issue 5

errno.h		| Issue 1

fcntl.h		File locking>locking and other operations	Issue 1

fenv.h		C mathematical functions >| Issue 6

float.h		C data types >| Issue 4

fmtmsg.h		| Issue 4

fnmatch.h		| Issue 4

ftw.h		| Issue 1

glob.h		Glob (programming)>"globbing" (pattern-matching)	Issue 4

grp.h		Group identifier (Unix)>group information and control	Issue 1

iconv	>open}}'''	Character encoding	conversion facility >| Issue 4

inttypes.h		C data types >| Issue 5

iso646.h		C alternative tokens >| Issue 5

langinfo.h		C localization functions >| Issue 2

libgen.h		| Issue 4

limits.h		C data types >| Issue 1

locale.h		C localization functions >| Issue 3

math.h		C mathematical functions >| Issue 1

monetary.h		| Issue 4

mqueue.h		Message queue >| Issue 5

ndbm.h		NDBM database operations >| Issue 4

net/if.h		| Issue 6

netdb.h		Berkeley sockets) >| Issue 6

netinet/in.h		Berkeley sockets) >| Issue 6

netinet/tcp.h		Transmission Control Protocol>TCP control options (part of Berkeley sockets)	Issue 6

nl_types.h		| Issue 2

poll.h		Asynchronous I/O>Asynchronous file descriptor multiplexing	Issue 4

pthread.h		POSIX threads >| Issue 5

pwd.h		Passwd (file)>passwd (user information) access and control	Issue 1

regex	regex.h		Regular expression matching >| Issue 4

sched.h		| Issue 5

search.h		| Issue 1

semaphore.h		Semaphore (programming)>semaphores	Issue 5

setjmp.h		| Issue 1

signal.h		C signal handling >| Issue 1

spawn.h		Spawn (computing)>spawning	Issue 6

stdarg.h		| Issue 4

stdbool.h		C data types >| Issue 6

stddef.h		C data types >| Issue 4

stdint.h		C data types >| Issue 6

stdio.h		C file input/output >| Issue 1

stdlib.h		C standard library >| Issue 3

string.h		C string handling >| Issue 1

strings.h		| Issue 4

stropts.h		ioctl >| Issue 4

sys/ipc.h		Inter-process communication (IPC) >| Issue 2

sys/mman.h		Shared memory (interprocess communication)>shared memory and memory mapped files	Issue 4

sys/msg.h		message queues >| Issue 2

sys/resource.h		| Issue 4

sys/select.h		Select (Unix)>Synchronous I/O multiplexing	Issue 6

sys/sem.h		Unix System V>SysV style) Semaphore (programming)	>| Issue 2

sys/shm.h		Unix System V>SysV style) Shared memory (interprocess communication)	>| Issue 2

sys/socket.h		Berkeley sockets header >| Issue 6

sys/stat.h		stat (Unix)>stat et al.)	Issue 1

sys/statvfs.h		| Issue 4

sys/time.h		| Issue 4

sys/times.h		| Issue 1

sys/types.h		| Issue 1

sys/uio.h		Vectored I/O operations >| Issue 4

sys/un.h		Unix domain sockets >| Issue 6

sys/utsname.h		uname >| Issue 1

sys/wait.h		wait (operating system)>wait)	Issue 3

syslog.h		syslog>System error logging	Issue 4

tar.h		File format#Magic number>Magic numbers for the tar (file format)	archive format >| Issue 3

termios.h		Serial port>terminal I/O interfaces	Issue 3

tgmath.h		C mathematical functions >| Issue 6

time.h		C date and time functions >| Issue 1

trace.h		| Issue 6

ulimit.h		| Issue 1

unistd.h		| Issue 1

utime.h		inode access and modification times >| Issue 3

utmpx.h		| Issue 4

wchar.h		C string handling >| Issue 4

wctype.h		C character classification >| Issue 5

wordexp.h		Unix shell>shell would perform	Issue 4

References

• Official List of headers in the POSIX library on opengroup.org
• WEB,weblink Lists headers in the POSIX library, November 6, 2007,weblink" title="web.archive.org/web/20100724201155weblink">weblink July 24, 2010, dead, mdy-all,
• Description of the posix library from the Flux OSKit

Further reading

• {{citation| last = Gallmeister| first = Bill| date = January 1, 1995| title = POSIX.4 Programmers Guide: Programming for the Real World| edition = 1st| publisher = O'Reilly Media| isbn = 1-56592-074-0| url =weblink

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