On Sat, 17 Nov 2001, Rock Gordon wrote:
> Hi,
>
> I've written a modest filesystem for fun, it works
> pretty ok, but when I try to execute binaries from it,
> bash says "cannot execute binary file" ... If I copy
> the same binary elsewhere, it executes perfectly.
>
> Does anybody have any clue ?
Yes
keep in mind taht the kernel do demand paging of the text (code) in our
executable, meaning that a page of code is not loaded into the procs
memory spce (and thus phys mem) until the proc actually tries to exec the
code page. This is one manifestation of the funny term "page fault"!
I do belive that the current kernel uses mmap to map in the exec file text
segment. (Even if I can hear the ice cracking under my feet, never
actually looked at the code handling execs) but if you strace anexec that
uses shared libs you'll note that the sh.libs are mmaped into the process
space. (also note the MMAP_EXEC flag in the mmap(2) man page).
TJ
>
> Regards,
> Rock
>
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-- _________________________________________________________________________Terje Eggestad terje.eggestad@scali.no Scali Scalable Linux Systems http://www.scali.com
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