Re: Re: Strange Linux behaviour with blocking syscalls and stop signals+SIGCONT

["Michael Kerrisk" <michael.kerrisk@gmx.net>]

Von: Ulrich Drepper <drepper@redhat.com>

> sem_wait() is another case.  Here the EINTR handling is exposed to the
> programmer.  Currently, as I understand it, even SA_RESTART handlers
> cause EINTR to be returned.  

Yes, this is true for sem_wait().

> Yes, this usually correct but it  might
> disrupt existing code.
> 
> This is why I'd caution anybody who thinks about changing something in
> this area.  *I* could live with it, I can fix and recompile all the code
> I use.  But others aren't that lucky.

Yes; this is why I'm only proposing to change EINTR to ERESTARTNOHAND
at the moment.  The only userspace visible change that I think
this will bring about is in the stop+SIGCONT case.  Changing EINTR
to ERESTARTSYS is likely to have more impact on userland (though 
it still strikes me as a desirable gola to have all system calls 
restartable via SA_RESTART).

Cheers,

Michael
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