C++ || Snippet – How To Override The Default Signal Handler (CTRL-C)

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The following is sample code which demonstrates the use of the “signal” function call on Unix based systems.

Signals are interrupts delivered to a process by the operating system which can terminate a program prematurely. You can generate interrupts by pressing Ctrl+C. The “signal” function call receives two arguments. The first argument is an integer which represents the signal number, and the second argument is a pointer to the user defined signal handling function.

The following program catches the “SIGINT” signal number using the signal() function.


QUICK NOTES:
The highlighted lines are sections of interest to look out for.

The code is heavily commented, so no further insight is necessary. If you have any questions, feel free to leave a comment below.

The following is sample output:

Please press CTRL-C

^C Haha I have 10 lives!
^C Haha I have 9 lives!
^C Haha I have 8 lives!
^C Haha I have 7 lives!
^C Haha I have 6 lives!
^C Haha I have 5 lives!
^C Haha I have 4 lives!
^C Haha I have 3 lives!
^C Haha I have 2 lives!
^C Haha I have 1 lives!
^C ** Ahh you got me...

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