In article <Mar.15.12.47.54.1992.3590@dartagnan.rutgers.edu> hedrick@dartagnan.rutgers.edu (Charles Hedrick) writes:
quoted text
>I've been trying out gdb, from tsx-11.  It's not entirely easy to
>install it, as I had to figure out what libg.a is supposed to be,
>and I had to remember to use cc1-g from the 1.40 distribution.
>But I've got something that mostly works.  However when I try
>to step through a call to localtime, I get
>
>  Bad things happen: nonexistent page error in do_no_page
>  Segmentation fault
>
>This is the version of localtime from the BSD ctime.c, which is
>in the libc I put out on athos.rutgers.edu a couple of weeks ago.

The "bad things" error is a message that happens when the memory manager
gets a request for a page not in the users process-space, which
shouldn't be possible (as those errors should be trapped by the
segmentation handler).  However, ptrace() does some mucking around with
the memory, and it had a bug (now fixed, I hope) that is probably the
reason for this.  I'm happy most of it seems to work, though. 

                Linus