Re: Core dumps & restarting
H. Peter Anvin (hpa@transmeta.com)
29 Oct 1996 19:27:30 GMT
Followup to: <Pine.LNX.3.95.961028193059.22451A-100000@xeo.net>
By author: psychos@xeo.net
In newsgroup: linux.dev.kernel
>
> On Mon, 28 Oct 1996, Eduardo Diaz Comellas wrote:
>
> > Hi!
> >
> > I was wandering how to stop a process, reboot the machine, and
> > restart that process. Is there a way to provoke a program to dump
> > itself, and restart it after the reboot?
> >
> > Maybe we can define a new executable format for it to work ;-)
> >
> > Cheers!
>
> This would be practically impossible as you'd have to load the program
> into the exact same memory space or all of its pointers would be bad...
> Memory fragmentation issues would make it very hard to get any program to
> occupy the exact same space it did before.
>
Not at all. All the pointers are referring to virtual memory, which
is customized for each process anyway. You can force a process to
dump core by sending it a SIGQUIT; you can then use gdb to restart it,
or use a program called "undump" to turn it into an executable.
However, the program will have lost all file descriptors, so it needs
to be written to accommodate that.
-hpa
--
Not speaking for Transmeta in any shape, way, or form.