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Old 12-11-2009, 10:40 PM
Ratnam Tatavarty
Default calling crash from another program (or vice versa)

It is possible that some uber debugger has done it in his local build, but
expect, from my experience, also seems to be lot of work put up for the
non-debug things while getting it to work. I liked pykdump.so better and

does the job with minimal effort. And you always have either quick script
or a standard library of commands while debugging.


On Fri, Dec 11, 2009 at 3:29 PM, James Washer <washer@trlp.com> wrote:

Often, I'd like to be able to run one crash command, massage the data

produced, and run follow up commands using the massaged data

A (possibly crazy) example, run the mount command, collect the

superblocks addresses, for each super_block, get the s_inodes list head,

traverse each list head to the inode, for each inode, find it's i_data

(address_space) and get the number of pages.. Now.. sum these up and

print a table of filesystem mounts points and the number of cached pages

for each... Perhaps, I'd even traverse the struct pages to provide a

count of clean and dirty pages for each file system.

I do do this by hand. (i.e. mount > mount.file; perlscript mount.file >

crash-script-step-1, then, back in crash I do ". crash-script-step-1 >

data-file-2; and repeat with more massaging).. This is gross, prone to

error, and not terribly fast.

I'd love to start crash as a child of perl and either use expect (which

is a bit of a hack) or better yet, have some machine interface to crash

(ala gdbmi)...

I know.. it's open source, I should write it myself. I just don't want

to reinvent the wheel, if someone else already has done something like


Perhaps I need to learn sial. But what little sial I've looked at seems

a bit low level for my needs.

Has anyone had much luck using expect with crash?


*- jim


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