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There are _____ signals that are generated from the keyboard.

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There are _____ signals that are generated from the keyboard.

(a) 2

(b) 3

(c) 1

(d) 5

This question was addressed to me in semester exam.

The doubt is from Process Control System Calls in portion System Programming II – Process Control & Unix System Performance of Unix

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Correct choice is (b) 3

The explanation is: There are 3 signals that have their origin in the keyboard and all these three signals affect the foreground job. For example, ctrl-c generates the SIGINT signal (terminates the process), ctrl-\ generates the SIGQUIT signal which directs a process to produce a core dump, ctrl-z sends SIGSTOP to all the processes of foreground process group.

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