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 SUNOS

siginterrupt

siginterrupt(3C)					   Standard C Library Functions 					  siginterrupt(3C)

NAME

       siginterrupt - allow signals to interrupt functions

SYNOPSIS

       #include <signal.h>

       int siginterrupt(int sig, int flag);

DESCRIPTION

       The  siginterrupt()  function  changes  the restart behavior when a function is interrupted by the specified signal. The function siginter-
       rupt(sig, flag) has an effect as if implemented as:

       siginterrupt(int sig, int flag) {
	    int ret;
	    struct sigaction act;
	    (void) sigaction(sig, NULL, &act);
	    if (flag)
		 act.sa_flags &=  SA_RESTART;
	    else
		 act.sa_flags |= SA_RESTART;
	    ret = sigaction(sig, &act, NULL);
	    return ret;
       }

RETURN VALUES

       Upon successful completion, siginterrupt() returns 0. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The siginterrupt() function will fail if:

       EINVAL	       The sig argument is not a valid signal number.

USAGE

       The siginterrupt() function supports programs written to historical system interfaces. A standard-conforming application, when being  writ-
       ten or rewritten, should use sigaction(2) with the SA_RESTART flag instead of siginterrupt().

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       sigaction(2), signal.h(3HEAD), attributes(5), standards(5)

SunOS 5.10							    1 Sep 2003							  siginterrupt(3C)