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The Linux kernel provides several interfaces to user-space applications that are used for different purposes and that have different properties by design. API and the “kernel internal” API. API, which allows programs in user space to access system resources and services of the Linux kernel.
APIs of other systems implementing the POSIX API also provide additional features not defined in POSIX. At the same time, Linux kernel developers have historically been conservative and meticulous about introducing new system calls. Much available free and open-source software is written for the POSIX API.