program makes a system call, explain how the mode bit changes to Supervisor mode. b) When we want to return from a Service Routine to the User program which executed the system call, explain how we restore the old condition codes of th
a) When a User
b) When we want to return from a Service Routine to the User program which executed the system call, explain how we restore the old condition codes of that User program.
Summary
The unrestricted mode is referred to as manager mode or kernel mode, and the restrained one is known as user mode.
The working device runs In kernel mode or supervisor mode, it is covered from person tampering with the aid of the hardware while compiler and editors run in user mode.
If a user desires to write a new compiler and replace the provided one she can do it, but she isn’t always unfastened to write down her very own clock interrupt handler, that is part of the working system and is generally included through hardware towards tries by using users to modify it.
User modes does now not allow operations like writes to random reminiscence, to guard programs from one another while the manager mode allow such operation as the operating gadget wishes such sort of stuff.
Categories Windows Unix
Process control CreateProcess()
ExitProcess()
WaitForSingleObject() fork()
Exit()
Wait()
Device manipulation SetConsoleMode()
ReadConsole()
WriteConsole() loctl()
Read()
Write()
File manipulation CreateFile()
ReadFile()
WriteFile()
CloseHandle() Open()
Read()
Write()
Close!)
Information maintanence GetCurrentProcessID()
SetTimer()
Sleep() getpid()
Alarm()
Sleep()
Communication CreatePipe()
CreateFileMapping()
MapViewOfFile() Pipe()
Shm_open()
Mmap()
Protection SetFileSecurity()
InitlializeSecurityDescriptor()
SetSecurityDescriptorGroup ()
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