C POSIX library - AbsoluteAstronomy.com

The C POSIX library is a specification of a C standard library

C standard library

The C Standard Library is the standard library for the programming language C, as specified in the ANSI C standard.. It was developed at the same time as the C POSIX library, which is basically a superset of it...

for POSIX

POSIX

POSIX , an acronym for "Portable Operating System Interface", is a family of standards specified by the IEEE for maintaining compatibility between operating systems...

systems. It was developed at the same time as the ANSI C

ANSI C

ANSI C refers to the family of successive standards published by the American National Standards Institute for the C programming language. Software developers writing in C are encouraged to conform to the standards, as doing so aids portability between compilers.-History and outlook:The first...

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

	Magic numbers for the cpio Cpio cpio is a general file archiver utility and its associated file format. It is primarily installed on Unix-like computer operating systems. The software utility was originally intended as a tape archiving program as part of the Programmer's Workbench , and has been a component of virtually every... archive format.
<dirent.h Dirent.h dirent.h is the header in the C POSIX library for the C programming language that contains constructs that facilitate directory traversing. The function is not part of the C standard, but is considered "pseudo-standard" and is usually portable between platforms.- Member functions :- Member... >	Allows the opening and listing of directories Directory (file systems) In computing, a folder, directory, catalog, or drawer, is a virtual container originally derived from an earlier Object-oriented programming concept by the same name within a digital file system, in which groups of computer files and other folders can be kept and organized.A typical file system may... .
<fcntl.h Fcntl.h fcntl.h is the header in the C POSIX library for the C programming language that contains constructs that refer to file control, e.g. opening a file, retrieving and changing the permissions of file, locking a file for edit, etc.- Member constants :... >	File opening, locking File locking File locking is a mechanism that restricts access to a computer file by allowing only one user or process access at any specific time. Systems implement locking to prevent the classic interceding update scenario .... and other operations.
	User group Group identifier (Unix) In Unix-like systems, multiple users can be categorized into groups. POSIX and conventional Unix file system permissions are organized into three classes, user, group, and others. The use of groups allows additional abilities to be delegated in an organized fashion, such as access to disks,... information and control.
	Defines an API for creating and manipulating POSIX POSIX POSIX , an acronym for "Portable Operating System Interface", is a family of standards specified by the IEEE for maintaining compatibility between operating systems... threads.
	passwd Passwd (file) In Unix-like operating systems the /etc/passwd file is a text-based database of information about users that may login to the system or other operating system user identities that own running processes.... (user information) access and control.
	Inter-process communication Inter-process communication In computing, Inter-process communication is a set of methods for the exchange of data among multiple threads in one or more processes. Processes may be running on one or more computers connected by a network. IPC methods are divided into methods for message passing, synchronization, shared... (IPC).
	POSIX message queue Message queue In computer science, message queues and mailboxes are software-engineering components used for interprocess communication, or for inter-thread communication within the same process. They use a queue for messaging – the passing of control or of content... s.
	POSIX semaphore Semaphore (programming) In computer science, a semaphore is a variable or abstract data type that provides a simple but useful abstraction for controlling access by multiple processes to a common resource in a parallel programming environment.... s.
<sys/stat.h Sys/stat.h ' is the header in the C POSIX library for the C programming language that contains constructs that facilitate getting information about files attributes.- Member functions :- Member constants :... >	File information (stat Stat (Unix) stat is a Unix system call that returns useful data about a file inode. The semantics of stat vary between operating systems. As an example, the Unix command ls uses it to retrieve information on : time of last modification , time of last status change and time of last access .-stat functions and... et al.).
	Time and date functions and structures.
	Various data types used elsewhere.
	uname Uname uname is a software program in Unix and Unix-like computer operating systems that prints the name, version and other details about the current machine and the operating system running on it... and related structures.
	Status of terminated child processes (see wait Wait (operating system) In modern computer operating systems, a process may wait on another process to complete its execution. In most systems, a parent process can create an independently executing child process. The parent process may then issue a wait system call, which suspends the execution of the parent process... )
	Magic numbers for the tar Tar (file format) In computing, tar is both a file format and the name of a program used to handle such files... archive format.
	Allows terminal I/O Serial port In computing, a serial port is a serial communication physical interface through which information transfers in or out one bit at a time... interfaces.
<unistd.h Unistd.h In the C and C++ programming languages, unistd.h is the name of the header file that provides access to the POSIX operating system API. It is defined by the POSIX.1 standard, the base of the Single Unix Specification, and should therefore be available in any conforming operating system/compiler .On... >	Various essential POSIX functions and constants.
<utime.h Utime.h utime.h is the header in the C POSIX library for the C programming language that facilitates the setting of file access and modification times.-Member functions:int utime... >	inode Inode In computing, an inode is a data structure on a traditional Unix-style file system such as UFS. An inode stores all the information about a regular file, directory, or other file system object, except its data and name.... access and modification times.

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