Hi all,

How can I get a D program to detect something a keyboard interrupt so I shut things down in a specific way?

On Monday, 10 May 2021 at 23:20:47 UTC, Tim wrote:

import core.sys.posix.signal; then you can use the same functions as C to set signal handlers.

On Monday, 10 May 2021 at 23:31:11 UTC, Adam D. Ruppe wrote:

I can't find that in the docs, nor in dpldocs. Can you help out with this?

On Monday, 10 May 2021 at 23:35:06 UTC, Tim wrote:

dpldocs.info/signal it comes up as the second result.

The C function you call from there (on linux anyway) is sigaction. A little copy/paste out of my terminal.d:

      // I check this flag in my loop to see if an interruption happened
      // then i can cleanly exit from there.
       __gshared bool interrupted;

      // the interrupt handler just sets the flag
       extern(C)
       void interruptSignalHandler(int sigNumber) nothrow {
               interrupted = true;
       }

       // then this code registers the handler with the system
       import core.sys.posix.signal;
       sigaction_t n;
       n.sa_handler = &interruptSignalHandler;
       sigaction(SIGINT, &n, &oldSigIntr); // third arg can also be null if you don't care about the old one

On Monday, 10 May 2021 at 23:55:18 UTC, Adam D. Ruppe wrote:

      // I check this flag in my loop to see if an interruption happened
      // then i can cleanly exit from there.
       __gshared bool interrupted;

      // the interrupt handler just sets the flag
       extern(C)
       void interruptSignalHandler(int sigNumber) nothrow {
               interrupted = true;
       }

       // then this code registers the handler with the system
       import core.sys.posix.signal;
       sigaction_t n;
       n.sa_handler = &interruptSignalHandler;
       sigaction(SIGINT, &n, &oldSigIntr); // third arg can also be null if you don't care about the old one

I don't know why I didn't find that. I was searching for the full name, maybe too specific? Thanks anyways, this is super helpful. I wish it was documented better though :(

So why use sigaction and not signal? From what I can tell signal is the C way of doing things

On Tuesday, 11 May 2021 at 06:44:57 UTC, Tim wrote:

Use sigaction(), signal() has problems. See this stackoverflow 1 question explains the details

On Tuesday, 11 May 2021 at 06:59:10 UTC, Patrick Schluter wrote:

Thanks a lot!