C POSIX library

{{Short description|C language standard library specifically for POSIX systems}}

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. On the other hand, the 5 headers that were added to the C standard library with C11, were not likewise included in subsequent revisions of POSIX.

It may be included in any C++ project, however the C++ standard library may have its own implementation of certain features, such as rather than , rather than , or rather than .

C POSIX library header files

class="wikitable sortable" ! Header file!! Description !! First released !! C Standard
{{tag\|aio.h\|open}}	Asynchronous input and output	Issue 5
{{tag\|arpa/inet.h\|open}}	Functions for manipulating numeric IP addresses (part of Berkeley sockets)	Issue 6
{{tag\|assert.h\|open}}	Verify assumptions	Issue 1	ANSI (89)
{{tag\|complex.h\|open}}	Complex Arithmetic, see C mathematical functions	Issue 6	C99
{{tag\|cpio.h\|open}}	Magic numbers for the cpio archive format	Issue 3
{{tag\|ctype.h\|open}} \|Character types \|Issue 1 \|ANSI (89)
{{tag\|dirent.h\|open}}	Allows the opening and listing of directories	Issue 2
{{tag\|dlfcn.h\|open}}	Dynamic linking	Issue 5
{{tag\|errno.h\|open}}	Retrieving Error Number	Issue 1	ANSI (89)
{{tag\|fcntl.h\|open}}	File opening, locking and other operations	Issue 1
{{tag\|fenv.h\|open}}	Floating-Point Environment (FPE), see C mathematical functions	Issue 6	C99
{{tag\|float.h\|open}}	Floating-point types, see C data types	Issue 4	ANSI (89)
{{tag\|fmtmsg.h\|open}}	Message display structures	Issue 4
{{tag\|fnmatch.h\|open}}	Filename matching	Issue 4
{{tag\|ftw.h\|open}}	File tree traversal	Issue 1
{{tag\|glob.h\|open}}	Pathname "globbing" (pattern-matching)	Issue 4
{{tag\|grp.h\|open}}	User group information and control	Issue 1
{{tag\|iconv.h\|open}}	Codeset conversion facility	Issue 4
{{tag\|inttypes.h\|open}}	Fixed sized integer types, see C data types	Issue 5	C99
{{tag\|iso646.h\|open}}	Alternative spellings, see C alternative tokens	Issue 5	NA1 (95)
{{tag\|langinfo.h\|open}}	Language information constants – builds on C localization functions	Issue 2
{{tag\|libgen.h\|open}}	Pathname manipulation	Issue 4
{{tag\|limits.h\|open}}	Implementation-defined constants, see C data types	Issue 1	ANSI (89)
{{tag\|locale.h\|open}}	Category macros, see C localization functions	Issue 3	ANSI (89)
{{tag\|math.h\|open}}	Mathematical declarations, see C mathematical functions	Issue 1	ANSI (89)
{{tag\|monetary.h\|open}}	String formatting of monetary units	Issue 4
{{tag\|mqueue.h\|open}}	Message queue	Issue 5
{{tag\|ndbm.h\|open}}	NDBM database operations	Issue 4
{{tag\|net/if.h\|open}}	Listing of local network interfaces	Issue 6
{{tag\|netdb.h\|open}}	Translating protocol and host names into numeric addresses (part of Berkeley sockets)	Issue 6
{{tag\|netinet/in.h\|open}}	Defines Internet protocol and address family (part of Berkeley sockets)	Issue 6
{{tag\|netinet/tcp.h\|open}}	Additional TCP control options (part of Berkeley sockets)	Issue 6
{{tag\|nl_types.h\|open}}	Localization message catalog functions	Issue 2
{{tag\|poll.h\|open}}	Asynchronous file descriptor multiplexing	Issue 4
{{tag\|pthread.h\|open}}	Defines an API for creating and manipulating POSIX threads	Issue 5
{{tag\|pwd.h\|open}}	passwd (user information) access and control	Issue 1
{{anchor\|regex\|regex.h}}{{tag\|regex.h\|open}}	Regular expression matching	Issue 4
{{tag\|sched.h\|open}}	Execution scheduling	Issue 5
{{tag\|search.h\|open}}	Search tables	Issue 1
{{tag\|semaphore.h\|open}}	POSIX semaphores	Issue 5
{{tag\|setjmp.h\|open}}	Stack environment declarations	Issue 1	ANSI (89)
{{tag\|signal.h\|open}}	Signals, see C signal handling	Issue 1	ANSI (89)
{{tag\|spawn.h\|open}}	Process spawning	Issue 6
{{tag\|stdarg.h\|open}}	Handle Variable Argument List	Issue 4	ANSI (89)
{{tag\|stdbool.h\|open}}	Boolean type and values, see C data types	Issue 6	C99
{{tag\|stddef.h\|open}}	Standard type definitions, see C data types	Issue 4	ANSI (89)
{{tag\|stdint.h\|open}}	Integer types, see C data types	Issue 6	C99
{{tag\|stdio.h\|open}}	Standard buffered input/output, see C file input/output	Issue 1	ANSI (89)
{{tag\|stdlib.h\|open}}	Standard library definitions, see C standard library	Issue 3	ANSI (89)
{{tag\|string.h\|open}}	Several String Operations, see C string handling	Issue 1	ANSI (89)
{{tag\|strings.h\|open}}	Case-insensitive string comparisons	Issue 4
{{tag\|stropts.h\|open}}	Stream manipulation, including ioctl	Issue 4
{{tag\|sys/ipc.h\|open}}	Inter-process communication (IPC)	Issue 2
{{tag\|sys/mman.h\|open}}	Memory management, including POSIX shared memory and memory mapped files	Issue 4
{{tag\|sys/msg.h\|open}}	POSIX message queues	Issue 2
{{tag\|sys/resource.h\|open}}	Resource usage, priorities, and limiting	Issue 4
{{tag\|sys/select.h\|open}}	Synchronous I/O multiplexing	Issue 6
{{tag\|sys/sem.h\|open}}	XSI (SysV style) semaphores	Issue 2
{{tag\|sys/shm.h\|open}}	XSI (SysV style) shared memory	Issue 2
{{tag\|sys/socket.h\|open}}	Main Berkeley sockets header	Issue 6
{{tag\|sys/stat.h\|open}}	File information (stat et al.)	Issue 1
{{tag\|sys/statvfs.h\|open}}	File System information	Issue 4
{{tag\|sys/time.h\|open}}	Time and date functions and structures	Issue 4
{{tag\|sys/times.h\|open}}	File access and modification times	Issue 1
{{tag\|sys/types.h\|open}}	Various data types used elsewhere	Issue 1
{{tag\|sys/uio.h\|open}}	Vectored I/O operations	Issue 4
{{tag\|sys/un.h\|open}}	Unix domain sockets	Issue 6
{{tag\|sys/utsname.h\|open}}	Operating system information, including uname	Issue 1
{{tag\|sys/wait.h\|open}}	Status of terminated child processes (see wait)	Issue 3
{{tag\|syslog.h\|open}}	System error logging	Issue 4
{{tag\|tar.h\|open}}	Magic numbers for the tar archive format	Issue 3
{{tag\|termios.h\|open}}	Allows terminal I/O interfaces	Issue 3
{{tag\|tgmath.h\|open}}	Type-Generic Macros, see C mathematical functions	Issue 6	C99
{{tag\|time.h\|open}}	Type-Generic Macros, see C date and time functions	Issue 1	ANSI (89)
{{tag\|trace.h\|open}}	Tracing of runtime behavior (DEPRECATED)	Issue 6
{{tag\|ulimit.h\|open}}	Resource limiting (DEPRECATED in favor of )	Issue 1
{{tag\|unistd.h\|open}}	Various essential POSIX functions and constants	Issue 1
{{tag\|utime.h\|open}}	inode access and modification times	Issue 3
{{tag\|utmpx.h\|open}}	User accounting database functions	Issue 4
{{tag\|wchar.h\|open}}	Wide-Character Handling, see C string handling	Issue 4	NA1 (95)
{{tag\|wctype.h\|open}}	Wide-Character Classification and Mapping Utilities, see C character classification	Issue 5	NA1 (95)
{{tag\|wordexp.h\|open}}	Word-expansion like the shell would perform	Issue 4

References

[http://www.opengroup.org/onlinepubs/9699919799/idx/head.html Official List of headers in the POSIX library on opengroup.org]
{{Cite web |url=http://www.space.unibe.ch/comp_doc/c_manual/C/FUNCTIONS/funcref.htm |title=Lists headers in the POSIX library |access-date=November 6, 2007 |archive-url=https://web.archive.org/web/20100724201155/http://www.space.unibe.ch/comp_doc/c_manual/C/FUNCTIONS/funcref.htm |archive-date=July 24, 2010 |url-status=dead |df=mdy-all }}
[http://www.cs.utah.edu/flux/oskit/html/oskit-wwwch20.html Description of the posix library from the Flux OSKit]

C POSIX library

C POSIX library header files

See also

References

Further reading