UGC NET Computer Science December 2019 | Question 81

Question 81

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Which of the following methods are used to pass any number of parameters to the operating system through system calls?

1. 1. Registers
2. 2. Block or table in main memory
3. 3. Stack
4. 4. Block in main memory and stack

Answer : 4. Block in main memory and stack

Explanation

System Call Parameter Passing
Often, more information is required than simply identity of desired system call
Exact type and amount of information vary according to OS and call

Three general methods used to pass parameters to the OS

1. Simplest: pass the parameters in registers
2. In some cases, may be more parameters than registers. Parameters stored in a block, or table, in memory, and address of block passed as a parameter in a register. This approach taken by Linux and Solaris
3. Parameters placed, or pushed, onto the stack by the program and popped off the stack by the operating system

Block and stack methods do not limit the number or length of parameters being passed

So, option 4 is correct answer

Please go to page number 17 of below attached PDF for more details:

Reference : OPERATING SYSTEMS Lecture Notes

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