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 ULTRIX

shutdown

shutdown(8) System Manager's Manual shutdown(8)

Name
shutdown - close down the system at a given time

Syntax
/etc/shutdown [ -k ] [ -r ] [ -h ] [ -o ] time [ warning-message ... ]

Description
The command provides an automated shutdown procedure that a superuser can use to notify users when the system is shutting down.

The time is the time at which will bring the system down. It may be the word `now', indicating an immediate shutdown, or specify a future
time in one of two formats: + number or hour : min. The first form brings the system down in number minutes. The second brings the system
down at the time of day indicated, using a 24-hour clock format.

At intervals which get shorter as shutdown nears, warning messages are displayed at the terminals of all users on the system. Warning mes-
sages are also sent to users who are logged in to a remote system that has mounted a file system or directory from the local system using
NFS. Five minutes before shutdown, or immediately if shutdown is timed for less than five minutes, logins are disabled by creating and
writing a message there. If this file exists when a user attempts to log in, prints its contents and exits. The file is removed just
before exits.

At shutdown time, a message is written in the file This message contains the time of shutdown, who ran shutdown, and the reason. Then, a
terminate signal is sent at to bring the system to single-user state.

If the or options are used, then executes or avoids shutting the system down (respectively). The option is for use by only. It indicates
to that it is being called by and not to return to the user.

You should place the time of the shutdown and the warning message in Use the message to inform the users about when the system will be back
up and why it is going down.

Restrictions
You can kill the system only between now and 23:59, if you use the absolute time for shutdown.

Files
Tells login not to let anyone log in

Log file for successful shutdowns

See Also
login(1), wall(1), halt(8), opser(8), reboot(8), rwalld(8c)

shutdown(8)