Re: [rfa] gdbserver signal handling

[Daniel Jacobowitz <drow at mvista dot com>]

On Thu, Feb 28, 2002 at 02:29:43PM -0500, Andrew Cagney wrote:
> >>I suspect there is a difference between not including defs.h and 
> >>unnecessarily duplicating common code.  My memory was that the signal 
> >>enums were to be moved to their own header file (so things like 
> >>gdbserver could include them).
> >>
> >>This gdb/gdbserver/signals.c looks largely like a copy of big chunks of 
> >>gdb/signals.c and other similar code.  I don't know that gdb developers 
> >>want to take on responsability for maintaining such duplication.
> >>
> >>Again, I think this can be cleaned up properly, but after the 5.2 branch 
> >>goes through.
> >
> >
> >What do you consider "properly", then?  For one minor thing, GDB wants
> >the conversion functions to return an `enum target_signal' whereas
> >gdbserver has no need to include "signals.h" in every file and only
> >wants an `int' back to send to the remote client.
> 
> I don't understand.  Presumably any file that needs to use one of the 
> signal conversion routines would include "signals.h" and get both the 
> enum and the function signature.  Beyond that, I don't think anyone is 
> going to notice if the code assigning the result to an int.  (I'm still 
> working on a -Wassign-enum flag for GCC :-^).

I'd rather have left the enum as opaque in gdbserver; nothing cares.  I
guess it doesn't matter at all.

> >Since you seem to strongly prefer sharing it, though, I suppose I could
> >do this instead:
> >  - create a new directory (``common''?) for files with well-defined
> >interfaces.
> >  - Move signals.c in there.   Create signals.h in there.
> >  - Add that directory to the search paths for both GDB and gdbserver.
> >
> >This would probably mean picking up the big signal to name conversion
> >table in gdbserver, which I wanted to avoid but no one else seemed
> >concerned about.
> 
> Not to long ago I suggested splitting up utils.c into smaller more 
> independant files and a directory (gdb/utils/).
> 
> We could do similar to signals.c.  We could even split the string 
> functions off from the conversion functions so that gdbserver didn't get 
> bloated by them.
> 
> However, not in the next three days :-)

OK, sounds good to me.  I'll discuss exactly where to split the files
after we branch.

> >Meanwhile?  Just leave signal handling in gdbserver crippled for the
> >upcoming branch?  OK, I guess.
> 
> Yes.  It isn't as bad as it sounds though.  The problem has always been 
> there so we're not exactly fixing a regression.  Besides, the next 
> release is only 22 weeks away.

My motivation to finish this before release was that this was the only
remaining set of tests which gdbserver should have been able to pass
and could not after my rewrite; it'll be built on a lot more platforms
now, and probably used more.  It didn't pass particularly many of
them beforehand.  This isn't terribly important to me, since I'm only
responsible for two distributions of GDB and both of them have patch
application mechanisms (:-)), but I suspect we'll see it reported
pretty frequently over the next 22 weeks.

I agree that the patch isn't ideal; but if a proper fix goes in the
mainline can we put this on the branch?

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer