gdb/146: Make "target xxx" command interruptible.

[ac131313@cygnus.com]

>Number:         146
>Category:       gdb
>Synopsis:       Make "target xxx" command interruptible.
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Fri Jul 06 20:18:02 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     ac131313@cygnus.com
>Release:        unknown-1.0
>Organization:
>Environment:

>Description:
Make "target xxx" command interruptible.

As things become async this becomes possible.  A target would start
the connect and then return control to the event loop.  A cntrl-c
would notify the target that the operation is to be abandoned and the
target code could respond.
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: