Hi Kandan..
> I want to track pages of a mmap file that has been written to,
> using a segv handler.
>
> What I want to know is whether the modifications to the mmap file
> will be guaranteed to be unaffected by the interruption of the signal
> handler, i.e. would the resultant changes in the mmap file be as if
> the mmap file had write access set.
I think yes, it would be unaffected. AFAIK, what you hook here is user
space handler, while the fault handler in kernel space itself is still
working as usual
But...what I don't understand is, why do you make the relevant pages in
read/write mode while you mmap the file in read only mode? If I
understand correctly about mmap internal, this will fail the write
operation.
>From mprotect manual:
"
ERRORS
..................
EACCES The memory cannot be given the specified access. This can
happen, for example, if you mmap(2) a file to which you have read-
only access, then ask mprotect to mark it PROT_WRITE."
I hope i explain it correctly. CMIIW, guys.
regards,
Mulyadi
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