Problem on capturing system Shutdown Post: 302847623

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Top Forums Programming Problem on capturing system Shutdown Post 302847623 by hakermania on Tuesday 27th of August 2013 12:57:16 PM

08-27-2013

Registered User

Problem on capturing system Shutdown

I am having exactly the same problem with Application Cleanup during Linux Shutdown but the thread is old and closed. The only difference is that I use sigaction() instead of signal(), which is recommended, as far as I know.

This is my code:

Code:

#include <stdio.h>
#include <signal.h>
#include <unistd.h>

void handler(int signal)
{
    FILE *out=fopen("test.txt","at");
    if (out)
    {
        fprintf(out,"got %d\n",signal);
        fclose(out);
    }
}

int main()
{
    struct sigaction sigIntHandler;

    sigIntHandler.sa_handler = handler;
    sigemptyset(&sigIntHandler.sa_mask);
    sigIntHandler.sa_flags = 0;

    sigaction(SIGINT, &sigIntHandler, NULL);
    sigaction(SIGTERM, &sigIntHandler, NULL);
    sigaction(SIGHUP, &sigIntHandler, NULL);
    sigaction(SIGQUIT, &sigIntHandler, NULL);
    while(1)
        sleep(30);
}

And this is some usage that shows that it is working:

Code:

$ rm -rf test.txt
$ ./signal_handling_test &
[1] 3599
$ kill -s SIGTERM 3599
$ cat test.txt
got 15

If I normally shutdown or log out then the process is killed without the clean up taking place.

I am running under Ubuntu 13.04.

hakermania

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LEARN ABOUT LINUX

sigpending

SIGPENDING(2)						     Linux Programmer's Manual						     SIGPENDING(2)

NAME

       sigpending - examine pending signals

SYNOPSIS

       #include <signal.h>

       int sigpending(sigset_t *set);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       sigpending(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE

DESCRIPTION

       sigpending() returns the set of signals that are pending for delivery to the calling thread (i.e., the signals which have been raised while
       blocked).  The mask of pending signals is returned in set.

RETURN VALUE

       sigpending() returns 0 on success and -1 on error.

ERRORS

       EFAULT set points to memory which is not a valid part of the process address space.

CONFORMING TO

       POSIX.1-2001.

NOTES

       See sigsetops(3) for details on manipulating signal sets.

       The set of signals that is pending for a thread is the union of the set of signals that is pending for that thread and the set  of  signals
       that is pending for the process as a whole; see signal(7).

       A child created via fork(2) initially has an empty pending signal set; the pending signal set is preserved across an execve(2).

BUGS

       In  versions of glibc up to and including 2.2.1, there is a bug in the wrapper function for sigpending() which means that information about
       pending real-time signals is not correctly returned.

SEE ALSO

       kill(2), sigaction(2), signal(2), sigprocmask(2), sigsuspend(2), sigsetops(3), signal(7)

COLOPHON

       This page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2008-10-04							     SIGPENDING(2)