Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!ames!lll-winken!uunet!odi!indirect!benson
From: benson@odi.com (Benson Margulies)
Newsgroups: gnu.gdb.bug
Subject: GDB and the shell and sunos 4 and cetra.
Message-ID: <379@odi.ODI.COM>
Date: 5 Jun 89 19:31:33 GMT
Sender: news@odi.com
Reply-To: <benson@odi.com>
Distribution: gnu
Organization: Object Design Inc., Burlington, MA
Lines: 21

Under SunOS 4, execing a dynamically linked object from inside a
process that has done a ptrace(PTRACE_TRACE_ME) results in an extra
breakpoint intended to let the debugger keep up with the linker.

/bin/csh is dynamically linked.

So gdb's code that depends on a shell to take care of redirection and
the like hits this breakpoint if one tries to use /bin/csh so as to
get ~ expansion.

I'd like to get gdb to actually work with dynamic linking some day.
It can't be done so long as gdb uses the trick of execing the shell to
get redirects and the like, unless gdb examined the shell to see if it
was dynamic, and if so expected one bogus breakpoint for free.

Is anyone else interested in using bourne-again-shell code to
put the redirects and such inline?

--benson

Benson I. Margulies