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.

C POSIX library header files[edit]

Note this table does not include the header files defined by the ISO C standard.

Header File Description First Released
<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 Assumptions  ??
<complex.h> Complex Arithmetic, see C mathematical functions  ??
<cpio.h> Magic numbers for the cpio archive format. Issue 3
<dirent.h> Allows the opening and listing of directories. Issue 2
<dlfcn.h> Dynamic linking Issue 5
<errno.h> Retrieving Error Number  ??
<fcntl.h> File opening, locking and other operations. Issue 1
<fenv.h> Floating-Point Environment, see C mathematical functions  ??
<float.h> Floating Types, see C data types  ??
<fmtmsg.h> Message display structures Issue 4
<fnmatch.h> Filename matching Issue 4
<ftw.h> File tree traversal Issue 1
<glob.h> Pathname "globbing" (pattern-matching) Issue 4
<grp.h> User group information and control. Issue 1
<iconv.h> Codeset conversion facility Issue 4
<inttypes.h> Fixed Size Integer Types, see C data types  ??
<iso646.h> Alternative Spellings, see C alternative tokens  ??
<langinfo.h> Language information constants. Build on C localization functions Issue 2
<libgen.h> Pathname manipulation Issue 4
<limits.h> Implementation-Defined Constants, see C data types  ??
<locale.h> Category Macros, see C localization functions  ??
<math.h> Mathematical Declarations, see C mathematical functions  ??
<monetary.h> String formatting of monetary units Issue 4
<mqueue.h> Message queue Issue 5
<ndbm.h> NDBM database operations Issue 4
<net/if.h> Listing of local network interfaces Issue 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 functions Issue 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 control. Issue 1
<regex.h> Regular expression matching Issue 4
<sched.h> Execution scheduling Issue 5
<search.h> Search tables Issue 1
<semaphore.h> POSIX semaphores Issue 5
<setjmp.h> Stack Environment Declarations  ??
<signal.h> Signals, see C signal handling  ??
<spawn.h> Process spawning Issue 6
<stdarg.h> Handle Variable Argument List  ??
<stdbool.h> Boolean Type and Values, see C data types  ??
<stddef.h> Standard Type Definitions, see C data types  ??
<stdint.h> Integer Types, see C data types  ??
<stdio.h> Standard Buffered Input/Oupt, see C file input/output  ??
<stdlib.h> Standard Library Definitions, see C standard library  ??
<string.h> Several String Operations, see C string handling  ??
<strings.h> Case-insensitive string comparisons Issue 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 limiting Issue 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 Berkley sockets header Issue 6
<sys/stat.h> File information (stat et al.). Issue 1
<sys/statvfs.h> File System information Issue 4
<sys/time.h> Time and date functions and structures. Issue 4
<sys/times.h> File access and modification times Issue 1
<sys/types.h> Various data types used elsewhere. Issue 1
<sys/uio.h> Vectored I/O operations Issue 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 format. Issue 3
<termios.h> Allows terminal I/O interfaces. Issue 3
<tgmath.h> Type-Generic Macros, see C mathematical functions  ??
<time.h> Type-Generic Macros, see C date and time functions  ??
<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 constants. Issue 1
<utime.h> inode access and modification times. Issue 3
<utmpx.h> user accounting database functions Issue 4
<wchar.h> Wide-Character Handling, see C string handling  ??
<wctype.h> Wide-Character Classification and Mapping Utilities, see C character classification  ??
<wordexp.h> Word-expansion like the shell would perform Issue 4


Further reading[edit]