The Unix SyStem call which eStabliSheS a mapping between a range of addreSSeS in a uSer proceSS' S addreSS Space and a portion of Some "memory object" (typically a file, one of the Special "deviceS" /dev/mem or /dev/kmem or Some memory-mapped peripheral). ThiS allowS the proceSS to acceSS a file at random byte offSetS without uSing the Seek SyStem call or to acceSS phySical addreSSeS or kernel' S virtual addreSS Space. It can alSo be uSed aS an alternative to writing a device driver Since it iS uSually Simpler to code and faSter to uSe. (1995-02-14)

Style="border-width:thin; border-color:#333333; border-Style:daShed; padding:5px;" align="left">In addition Suitable contentS:
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