POSIX defines application programming interfaces (APIs), along with command line shells and utility interfaces, for software compatibility (portability) with variants of Unix and other operating systems.

2009年11月23日 · Released in 1988, POSIX is a group of IEEE standards that define the API, shell, and utility interfaces for an operating system. Although aimed at UNIX-like systems, the standards can apply to any compatible operating system.

2025年3月19日 · POSIX stands for Portable Operating System Interface. It’s a family of standards specified by IEEE for maintaining compatibility among operating systems. Therefore, any software that conforms to POSIX standards should be compatible with other operating systems that adhere to the POSIX standards.

POSIX is derived mostly from various versions of the Unix operating system. The library facilities specified by the POSIX standards are a superset of those required by ISO C; POSIX specifies additional features for ISO C functions, as well as specifying new additional functions.

IEEE Std 1003.1, 2016 Edition, IEEE Standard for Information Technology - Portable Operating System Interface (POSIX), includes IEEE Std 1003.1-2008, IEEE Std 1003.1-2008/Cor 1-2013, and IEEE Std 1003.1-2008/Cor 2-2016

POSIX.1-2017 defines a standard operating system interface and environment, including a command interpreter (or "shell"), and common utility programs to support applications portability at the source code level.

An API is available to catch signals, wait for signals, mask signals, etc. See signal(7) for a general description of the signal mechanism

2024年1月19日 · The POSIX API (Application Programming Interface) is one of the most important parts of the POSIX standard, which defines the programming interfaces provided by operating systems. This includes file management, process and thread management, and timing and communication.

2023年11月1日 · Analyze your OS interactions and identify the POSIX APIs needed. Focus on essentials like files, processes, signals, threads. Refer to manuals like Beej‘s Guide to POSIX for usage details. Test on multiple POSIX OSes like Linux, macOS, Solaris. Let‘s walk through an example program using POSIX APIs for process creation and file operations:

POSIX defines various tools interfaces, commands and APIs for UNIX-like operating systems and others. The following are considered to be within the scope of POSIX standardization: System interface (functions, macros and external variables)