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Which of the following system call is more powerful (in waiting mechanism) than wait system call?

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Which of the following system call is more powerful (in waiting mechanism) than wait system call?

(a) waitp

(b) waitpid

(c) kill

(d) run

I had been asked this question in an online interview.

My question comes from Process Control Basics in chapter System Programming II – Process Control & Unix System Performance of Unix

1 Answer

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Right choice is (b) waitpid

Easy explanation: wait system call suffers from a number of limitations. It blocks until a child dies and if a parent spawns several children, wait returns the moment one of them dies. Wait also can’t handle process group. For these reasons, the waitpid system call is used.

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