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

Header File	Description
<cpio.h>	Magic numbers for the cpio archive format.
<dirent.h>	Allows the opening and listing of directories.
<fcntl.h>	File opening, locking and other operations.
<grp.h>	User group information and control.
<pthread.h>	Defines an API for creating and manipulating POSIX threads.
<pwd.h>	passwd (user information) access and control.
<sys/ipc.h>	Inter-process communication (IPC).
<sys/msg.h>	POSIX message queues.
<sys/sem.h>	POSIX semaphores.
<sys/stat.h>	File information (stat et al.).
<sys/time.h>	Time and date functions and structures.
<sys/types.h>	Various data types used elsewhere.
<sys/utsname.h>	uname and related structures.
<sys/wait.h>	Status of terminated child processes (see wait)
<tar.h>	Magic numbers for the tar archive format.
<termios.h>	Allows terminal I/O interfaces.
<unistd.h>	Various essential POSIX functions and constants.
<utime.h>	inode access and modification times.

^{[verification needed]}

References

Gallmeister, Bill (January 1, 1995), POSIX.4 Programmers Guide: Programming for the Real World (1st ed.), O'Reilly Media, p. 564, ISBN 1-56592-074-0