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system call

   Also found in: Dictionary/thesaurus, Acronyms, Wikipedia 0.01 sec.
system call [′sis·təm ‚kȯl]
(computer science)
supervisor call
(operating system, programming)system call - 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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In the active analysis we scan system call traces so we can detect a malicious program during its execution and this method compensate the defect found in the inactive analysis so we have a completer robust system for virus detection.
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The results of Watson's research entitled "Exploiting Concurrency Vulnerabilities in System Call Wrappers" show how concurrency can be used to bypass security protections applied by so-called syscall wrappers.
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JMI's C EXECUTIVE provides a comprehensive basic kernel, while PSX extends the system call library with an additional set of POSIX system calls.
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