On Thu, May 04, 2006 at 09:48:09PM +0200, Michael Kerrisk wrote: > > > > I just wrote a test case for "r+m", which seems to indicate that you > > > > are correct; an "r+m" file is read() not mmaped. > > > > > > Have you written a test program that verifies (presumably via > > > monitoring via 'strace') how 'm' changes the behaviour of stdio > > > with respect to the use of mmap()? > > Erm, yes, thats what I'm talking about (and is strace exactly what I > > did). But I'm not sure if I understand you .. I verified that all 3 > > routines mmap() a file if "m" is given (and it is read-only), and do > > not mmap() it if "m" is not given (or if it is not read-only). > > > > I include now the test program :) > > Yes, but did you verify: > > -- which file is being mmap()ed? (There might be many other > unrelated mmap() calls going on.) Yes; note that it only happens after you fread() for the first time.
> -- whether the behaviour changes if 'm' is removed from the fopen()? > (the strace output shd be different). Yes: > > routines mmap() a file if "m" is given (and it is read-only), and do > > not mmap() it if "m" is not given (or if it is not read-only). Justin -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
