Re: Expect fails to recognize regexp

[Elena Zannoni <ezannoni at redhat dot com>]

Add

exp_internal 1
and
exp_internal 0

around the particualar send/expect interaction, then you will exacly
see in the output what expect think it matched.

That's the only way I know of making sense of stuff like this.

Elena



Corinna Vinschen writes:
 > Hi,
 > 
 > I'm trying to fix an error in the testsuite lib but I'm stuck at one
 > point.  For some mysterious reason, I can't get a regexp right.
 > 
 > Ok, the original preoblem I'm trying to solve is, that in lib/gdb.exp,
 > proc rerun_to_main() the procedure doesn't take into account, that
 > some targets never actually exit, but instead are programatically
 > trapped in some _exit function.
 > 
 > This means that rerun_to_main() must be able to manage the situation
 > that gdb not just reruns, but first asks 
 > 
 >   The program being debugged has been started already.
 >   Start it from the beginning? (y or n)
 > 
 > What I did was adding the following patch to gdb.exp:
 > 
 > Index: lib/gdb.exp
 > ===================================================================
 > RCS file: /cvs/src/src/gdb/testsuite/lib/gdb.exp,v
 > retrieving revision 1.26
 > diff -u -p -r1.26 gdb.exp
 > --- lib/gdb.exp	13 Sep 2002 17:20:11 -0000	1.26
 > +++ lib/gdb.exp	13 Sep 2002 17:59:35 -0000
 > @@ -1685,6 +1685,10 @@ proc rerun_to_main {} {
 >    } else {
 >      send_gdb "run\n"
 >      gdb_expect {
 > +      -re "The program .* has been started already.*y or n. $" {
 > +	  send_gdb "y\n"
 > +	  exp_continue
 > +      }
 >        -re "Starting program.*$gdb_prompt $"\
 >  	      {pass "rerun to main" ; return 0}
 >        -re "$gdb_prompt $"\
 > 
 > but it doesn't work!  I tried various... uhm... variations of the
 > expression, include simple stuff as
 > 
 > 	-re "The program.*"
 > 
 > or moving the -re back and forth in the gdb_expect expression but to
 > no avail.  The result in gdb.log was always the same:
 > 
 >   (gdb) PASS: gdb.base/ena-dis-br.exp: continue until exit at no stop
 >   run^M 
 >   The program being debugged has been started already.^M
 >   Start it from the beginning? (y or n) FAIL: gdb.base/ena-dis-br.exp:
 >   (timeout) rerun to main
 > 
 > As you can see, there's no 'y' in the log so expect didn't recognize
 > the expression at all.
 > 
 > Does anybody have an idea what's going on here?
 > 
 > Corinna
 > 
 > -- 
 > Corinna Vinschen
 > Cygwin Developer
 > Red Hat, Inc.
 > mailto:vinschen@redhat.com