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Top Forums Programming Perl: trap signal 'exit': why I am not able to have it work?? Post 303006347 by Don Cragun on Tuesday 31st of October 2017 05:12:01 PM
Old 10-31-2017
It looks like the $SIG(signal_number) function in perl sets a signal catching function for the signal specified by signal_number. Since no such signal is every received by perl, that signal handler is never invoked.

As I said, I'm not fluent in perl, but it is obvious that the mechanism you're using is not designed to work that way in perl. You need to either find another way to do it in perl or extend perl to do what you want. Just making up a new signal name isn't going to magically make perl guess that a should send itself a signal (that the underlying operating system doesn't provide) before it is terminated by some other signal or by the user exiting the code perl is running.

Or, maybe you could convert your perl script to a shell script and use the shell command language's trap command to do what you want?
 

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pause(2)							   System Calls 							  pause(2)

NAME
pause - suspend process until signal SYNOPSIS
#include <unistd.h> int pause(void); DESCRIPTION
The pause() function suspends the calling process until it receives a signal. The signal must be one that is not currently set to be ignored by the calling process. If the signal causes termination of the calling process, pause() does not return. If the signal is caught by the calling process and control is returned from the signal-catching function (see signal(3C)), the calling process resumes execution from the point of suspension. RETURN VALUES
Since pause() suspends thread execution indefinitely unless interrupted by a signal, there is no successful completion return value. If interrupted, it returns -1 and sets errno to indicate the error. ERRORS
The pause() function will fail if: EINTR A signal is caught by the calling process and control is returned from the signal-catching function. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ SEE ALSO
alarm(2), kill(2), signal(3C), wait(3C), attributes(5), standards(5) SunOS 5.10 28 Dec 1996 pause(2)
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