[petsc-users] Help with PETSc signal handling

[Mark Adams]

PETSc's signal handler is for segvs, etc. I don't know the details but I
don't think we care about external signals.




On Tue, Nov 7, 2017 at 7:17 AM, Gard Spreemann <gspr at nonempty.org> wrote:

> Hello list,
>
> I seem to be misunderstanding how to install a signal handler with
> PETSc. If I send the USR1 signal to a program with the below code, it
> exits with a non-zero exit code as if no signal handler were
> intalled. I'd appreciate if someone could shed some light on the
> matter.
>
> ***
>
> #include <stdio.h>
> #include <signal.h>
> #include <unistd.h>
> #include <string.h>
> #include <petscmat.h>
> #include <petscsys.h>
>
> PetscErrorCode handler(int signum, void * ctx)
> {
>   if (signum == SIGUSR1)
>   {
>     *((sig_atomic_t *) ctx) = 1;
>   }
>   return 0;
> }
>
>
> int main(int argc, char ** argv)
> {
>   printf("I am %lu, hear me roar.\n", getpid());
>
>   PetscInitialize(&argc, &argv, NULL, NULL);
>
>   sig_atomic_t flag = 0;
>   PetscErrorCode err;
>   err = PetscPopSignalHandler(); CHKERRQ(err);
>   err = PetscPushSignalHandler(handler, (void *)&flag); CHKERRQ(err);
>
>   for (int i = 0; i < 20; i++)
>   {
>     printf("I'm awake. Did anything happen?\n");
>     if (flag)
>     {
>       printf("YES!\n");
>       return 0;
>     }
>     else
>       printf("No...\n");
>
>     err = PetscSleep(5); CHKERRQ(err);
>   }
>
>   PetscFinalize();
>   return 0;
> }
>
>
> ***
>
>
> Best regards,
> Gard Spreemann
>
>
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