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POSIGINT signal()/sigaction in C++
 

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  1. POSIGINT signal()/sigaction in C++
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    <p>So here is my code:</p> <pre><code>void sigHandle(int sig) { signal(SIGINT, sigHandle); //Is this line necessairy? cout&lt;&lt;"Signal: "&lt;&lt;sig&lt;&lt;endl; } int main(){ signal(SIGINT, sigHandle); while(true){ //Supposed to loop until user exits. //rest of my code } } </code></pre> <p>Now it is my understanding of signal() that when the SIGINT command (Ctrl+C right?) is received my function sigHandle should be called with an integer value of 2 (the SIGINT number), the method should run and the program should <strong>NOT</strong> exit. </p> <p>All I would like to do is just print the signal number and move on, however after printing out "Signal: 2" it exits. </p> <p>(Eventually I'm supposed to handle the first 32 interrupts but I figured Ctrl+C would be the most difficult so I'm starting here.) </p> <p>In main if I do <strong>signal(SIGINT, SIG_IGN);</strong> it ignores the signal correctly and doesn't exit but I now have no way of knowing if I recieved the SIGINT interrupt. </p> <p>Earlier I was playing around with the sigaction struct but I could not find any real comprehensive documentation on it so I decided to go with just "raw" signal handling. </p> <p>This was my sigaction code (same problem as above):</p> <pre><code>struct sigaction action; action.sa_handler = sigHandle; sigemptyset(&amp;action.sa_mask); action.sa_flags = 0; sigaction(SIGINT, &amp;action, 0); </code></pre> <p>Thanks for your help!</p> <h1>EDIT</h1> <p>OK SO After many many many hours of scowering through man pages and the internet I have happened across a (very) ghetto solution involving saving the stack pre-infinite loop then when the interrupt comes, doing what I need to do, then re-setting the stack back to where it was and calling the sigrelse() command to re-set any states that might have been changed and not re-loaded.</p> <p>I understand that this is not the most elegant/efficient/or even socially acceptable solution to this problem but it works and as far as I can tell I am not leaking any memory anywhere so it's all good...</p> <p>I am still looking for a solution to this problem and I view my stack re-setting shenanigins as only a temporary fix...</p> <p>Thanks!</p>
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      1. VTUpMod
    1. CO`signal(2)` use is deprecated, you should be using `sigaction(2)`. Consult your local [man page](http://linux.die.net/man/2/signal).
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      1. USSam Miller
 

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