How to write to the middle of a swap file?

Hi,

   I am playing with 2.4S6. I want to replace
something in a swap file by something else of the same
length. I supposed in UFS, it is gonna be like this:

lseek(fd, offset, SEEK_SET);
write(fd, buf, len);

   I find that there is storeWrite function that seems
to be able to do these two steps. So I do

storeWrite(entry->mem_obj->swapout.sio, buf, len,
offset, NULL);

   However, I find that instead of writing to where I
want it to be, it goes to the end of the file. Why is
that? I run gdb with it many times but I still can't
figure it out. The return value from lseek inside
diskHandleWrite seems right, too. However, it still
appends to the end of the file. Can anyone help me on
this?

Thanks in advance.
Yee Man

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Received on Thu Jul 04 2002 - 23:13:17 MDT