Inthisbook,IdescribetheLinuxprogramminginterface—thesystemcalls,libraryfunctions,andotherlow-levelinterfacesprovidedbyLinux,afreeimplementationoftheUNIXoperatingsystem.Theseinterfacesareused,directlyorindirectly,byeveryprogramthatrunsonLinux.Theyallowapplicationstoperformtaskssuchasf