C POSIX library

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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.

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It may be included in any C++ project, however the C++ standard library may have its own implementation of certain features, such as <regex> rather than <regex.h>, <thread> rather than <pthread.h>, or <semaphore> rather than <semaphore.h>.

C POSIX library header files

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

See also

References

Further reading