Answer Posted / kumar babu

• User process executes a syscall open a file.
• User process links to a c runtime library for open and
sets up the needed parameters in registers.
• A software trap is executed now and the operation switches
to the kernel mode.
- The kernel looks up the syscall vector to call "open"
- The kernel tables are modified to open the file.
- Return to the point of call with exit status.
• Return to the user process with value and status.
• The user process may resume now with modified status on
file or abort on error with exit status.

what are different ways the context switch happens from user to kernel space or vice-versa ?

2565

What are system calls used for process management in linux?

1047

I would like to know whether Simado and Setu products are they EPBX or not ?

2321

Explain process management system calls in linux?

996