Re: core files

Michael Elizabeth Chastain (
Wed, 30 Dec 1998 13:54:36 -0600

Hi Albert,

> These aren't the only ways.

That's probably true.

> I think it would be good to let a crash dump handler open a device file
> to get control. Before dumping core, the kernel checks for a crash dump
> handler running with the same UID. If one is found, the dying process
> sleeps and the crash dump handler is asked to respond.

That would remove process invocation from the kernel path.

You could do a lot of *this* in user space by having a library function
set the default value for all signals, or just SIGSEGV, to a function
that uses some kind of IPC, such as writing to a fifo whose name includes
the uid. I wonder if it's possible to use preloading to inject that
snippet of code into an existing executable without relinking it and
without touching libc.

Michael Elizabeth Chastain
"love without fear"

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