Re: Commpage, Copy on Write
Re: Commpage, Copy on Write
- Subject: Re: Commpage, Copy on Write
- From: Shashi Rao <email@hidden>
- Date: Sat, 18 Mar 2006 20:31:41 -0800
* Mike Smith <email@hidden> [2006-03-18 13:23:32-0800]:
|
| On Mar 18, 2006, at 12:41 PM, Shashi Rao wrote:
|
| >Why can't I write to the commpage on my G5 running Tiger? Does it
| >not have COW semantics?
|
| Obviously, no.
|
| Communication via the commpage is one-way (kernel -> global userspace).
How do I breakpoint a child process in the commpage then? How does
gdb get away with it? (Does it?) Is there a reason the kernel
engineers decided to not allow COW on these pages?
Thanks,
Shashi
--
Shashi Rao
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