From: ts <decoux@...>
Date: 2004-05-25T17:53:15+09:00
Subject: Re: compiling mmap?

>>>>> "B" == Brian Feldman <green@FreeBSD.org> writes:

B> Looks like Darwin does not automatically translate PROT_WRITE into
B> PROT_READ | PROT_WRITE.  The concept of write-only memory regions in
B> userland programs is pretty strange... disassemble the instruction
B> currently executing and it's probably a RMW instruction.  Allowing
B> the user to specify PROT_WRITE alone probably shouldn't happen in
B> Ruby.

 Well, not really the patch that have given in [ruby-talk:101215] was
 precisely to have PROT_READ | PROT_WRITE in this case.

 Actually I don't see the difference between the 2 test, except that the
 second add the flag O_TRUNC when the file is opened.


Guy Decoux