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The GNU C Library

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1.2.3 Berkeley Unix

The GNU C library defines facilities from some versions of Unix which are not formally standardized, specifically from the 4.2 BSD, 4.3 BSD, and 4.4 BSD Unix systems (also known as Berkeley Unix) and from SunOS (a popular 4.2 BSD derivative that includes some Unix System V functionality). These systems support most of the ISO C and POSIX facilities, and 4.4 BSD and newer releases of SunOS in fact support them all.

The BSD facilities include symbolic links (see section 14.5 Symbolic Links), the select function (see section 13.8 Waiting for Input or Output), the BSD signal functions (see section 24.10 BSD Signal Handling), and sockets (see section 16. Sockets).

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