摘要：
Every process has six or more IDs associated with it. These are shown in Figure 4.5. Figure 4.5. User IDs and group IDs associated with each process real user ID real group IDwho we really areeffective user ID effective group ID supplementary group IDsused for file access perm... 阅读全文
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Most files on a UNIX system are either regular files or directories, but there are additional types of files. The types are:Regular file. The most common type of file, which contains data of some form. There is no distinction to the UNIX kernel whether this data is text or binary. Any interpretation 阅读全文
摘要：
'Restrict'PointersOneofthenewfeaturesintherecentlyapprovedCstandardC99,istherestrictpointerqualifier.Thisqualifiercanbeappliedtoadatapointertoindicatethat,duringthescopeofthatpointerdeclaration,alldataaccessedthroughitwillbeaccessedonlythroughthatpointerbutnotthroughanyotherpointer.The'r 阅读全文