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List:       uclinux-dev
Subject:    [uClinux-dev] Problem with interrupted nanosleep on MCF5329
From:       "Rottengatter, Peter" <Peter.Rottengatter () inteq ! com>
Date:       2007-08-27 15:27:00
Message-ID: 4244373FF2155241B4AEDE42D89F665DE006BB () MSGCELMBX ! ent ! bhicorp ! com
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Hi folx,

I'm trying to nanosleep on this MCF5329 board running 2.6.17. Ordinarily
I'd expect nanosleep to return 0 or -1 only, in the latter case setting
errno (that's what the man-page says). However, in this case it returns
-516, errno is 2 afterwards.

I need to handle signals during waiting. So I use the straight-forward
technique (async_act ist the global variable that is written to in the
signal handler)

   request.tv_sec  = seconds;
   request.tv_nsec = 0;

   while ((error=nanosleep (& request, & remain)) != 0)
      {
printf("returned:%d/%d\n",error,errno);
        if (errno != EINTR)
          {
             break;
           }
        switch (async_act)
          {
           ...
           }
        memcpy (& request, & remain, sizeof (struct timespec));
       }

which works on all sorts of platforms except this one. It waits OK as
long as no signal arrives. But a signal causes nanosleep to return with
value -516, which is documented nowhere. Is this a bug? Where in the
kernel code should I look for it?

Apologies for the footer, I cannot suppress it.

Regards

Peter Rottengatter
Baker Hughes INTEQ
Baker Hughes INTEQ GmbH
Baker-Hughes-Strasse 1, D - 29221 Celle
Tel.: +49 5141 203 0, Fax: +49 5141 203 296
Sitz der Gesellschaft: Celle, Amtsgericht Lueneburg HRB 100845
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Hans-Werner Hesse

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