Question

Unix

Consider the following statements, then select one of the answers below: The (signal) function shown below registers "sig_handler()" as the signal handler function for the SIGKILL signal, without the complexity of using sigaction(). When the SIGKILL signal is sent to a process running this code, by a user typing "kill -KILL <pid>" where the correct process ID is used for pid> to target the process, sig_handler) will be executed. signal(SIGKILL, sig_handler); The statements about the line of code are entirely correct. The statements about the line of code are only partially correct. The statements about the line of code are entirely incorrect.

Answer 1

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option 3 :
The statements about the line of code are entirely incorrect.

As per my knowledge, the Reason is :

• There are 2 signals which cannot be intercepted and handled, and they are SIGKILL and SIGSTOP.
• SIGKILLsignal is a signal which kills the Process immediately without any clean up.
• SIGKILL'svalue is 9. hence the command to invoke SIGKILL is 'kill -9 <pid>'. In the given statement, its mentioned as 'kill -KILL <pid>' ,which is incorrect.
• when SIGKILL signal is sent to the process, then sig_handler() won't be executed, as SIGKILL cannot be caught, handled or ignored.

Hence the given statement is incorrect entirely.