System calls
The C subroutine library depends on a handful of subroutine calls for operating system services.
If you use the C library on a system that complies with the POSIX.1 standard (also known as IEEE 1003.1), most of these subroutines are supplied with your operating system.
If some of these subroutines are not provided with your systemin the extreme case, if you are developing software for a bare board system, without an OSyou will at least need to provide do-nothing stubs (or subroutines with minimal functionality). Providing such stubs allows your programs to link with the subroutines in libc.a.
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