Re: [OT] Question about nanosleep

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

walt wrote:
> This question began when my gnome desktop on a linux amd64 machine started
> behaving badly while the same gnome packages on an x86 machine work perfectly.
>
> While poking around for clues I noticed that a configure script fails on the
> amd64 machine but works perfectly on the x86.  I'm not sure if this is the
> cause of my gnome malfunction, but here is the failing 'configure' code:
>
> $ cat conftest.c
>         #include <errno.h>
>         #include <limits.h>
>         #include <signal.h>
>         #include <sys/time.h>
>         #include <time.h>
>         #include <unistd.h>
>         #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
> /* watch for linewrap! */
>         #define TYPE_MAXIMUM(t)           ((t) (! TYPE_SIGNED (t)
> ? (t) -1                : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
>
>         static void
>         check_for_SIGALRM (int sig)
>         {
>           if (sig != SIGALRM)
>             _exit (1);
>         }
>
>         int
>         main ()
>         {
>           static struct timespec ts_sleep;
>           static struct timespec ts_remaining;
>           static struct sigaction act;
>           if (! nanosleep)
>             return 1;
>           act.sa_handler = check_for_SIGALRM;
>           sigemptyset (&act.sa_mask);
>           sigaction (SIGALRM, &act, NULL);
>           ts_sleep.tv_sec = 0;
>           ts_sleep.tv_nsec = 1;
>           alarm (1);
>           if (nanosleep (&ts_sleep, NULL) != 0)
>             return 1;
>           ts_sleep.tv_sec = TYPE_MAXIMUM (time_t);
>           ts_sleep.tv_nsec = 999999999;
>           alarm (1);
>           if (nanosleep (&ts_sleep, &ts_remaining) == -1 && errno == EINTR
>               && TYPE_MAXIMUM (time_t) - 10 < ts_remaining.tv_sec)
>             return 0;
>           return 119;
>         }
>
> I compiled the code on DragonFly-HEAD for comparison and I was surpised to see
> that nanosleep apparently doesn't work on DragonFly:  the program returns 119,
> just like on my misbehaving linux amd64 machine.
>
> Can someone give me the big picture here?  Does DragonFly implement nanosleep,
> and if not, why not?

Yes, it does.  There was just a bug in its code for signals.  Fixed in 
55d25c8782a76b25372313a908dff0a66d6ff342.

cheers
  simon

--
  <3 the future  +++  RENT this banner advert  +++   ASCII Ribbon   /"\
  rock the past  +++  space for low €€€ NOW!1  +++     Campaign     \ /
Party Enjoy Relax   |   http://dragonflybsd.org      Against  HTML   \
Dude 2c 2 the max   !   http://golden-apple.biz       Mail + News   / \