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Meaning of SYSTEM CALL

 
WordNet Dictionary
 
 Definition: 
[n]  an instruction that interrupts the program being executed and passes control to the supervisor
 
 Synonyms: supervisor call instruction
 
 See Also: call

 

 

Computing Dictionary
 
 Definition: 

The mechanism used by an application program to request service from the operating system. System calls often use a special machine code instruction which causes the processor to change mode (e.g. to "supervisor mode" or "protected mode"). This allows the OS to perform restricted actions such as accessing hardware devices or the memory management unit.

 

 

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