what would be the answer to this question? Explain why every process will execute at least one system call during its execution?

i believe it is because all processes do something with stdin/stdout and in order to access those it has to do a system call

I would've said that it's because every process calls exit(), either implicitly or explicitly. But I can see it being related to stdin/out/err too. Would have been nice to get the sample answers to the past exams, it's much more helpful when you can actually check your work.

ANONYMOUS wrote: I would personally say exit would apply better because technically you can just make a program that does nothing and so doesn't use I/O but I/O is still a good answer. I know how you feel, but according to research, it is linked to better exam performance (although students have lower confidence entering the exam). Because students discuss their understanding with others and search harder for the answers, it reinforces concepts and the answers to the questions stay in their mind longer. So, Amitava isn't doing it to be mean.

Does every process use the exit() system call to terminate?

look up "_start()" for more info otherwise https://en.cppreference.com/w/c/program/exit

ANONYMOUS wrote: Each process starts with three open file descriptors, stdin, stdout, stderr - these will require system calls to open.