NetApp Interview Question Software Engineer / Developers
0of 0 votesSystem call? What happens in low level.
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System call? What happens in low level.
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The below sequence of operations will occur.
- Madhu July 21, 20151. In kernel, each system call is identified by a number.
2. When system call is called, first it calls the C lib wrapper function. This function place all the required information in the CPU registers. i.e. in case of ARM, R7 is placed with the system call id no.
3. After this, Software interrupt (SWI) is generated to switch the context from user to kernel space.
4. Now the process is in kernel mode, trap handler is called, system_call() to handle this.
5. Trap handler copied all the information from CPU register to kernel stack. It validates the information. It gets the required system call routine from sys_call_table().
6. After serving the actual system call, control is returned back to trap handler, and from there to user space.