any locking/critical regions will have to use aso
because libast itself does not require -l*thread*
On Thu, 16 Aug 2012 16:11:16 +0200 =?KOI8-R?B?z8zYx8Egy9LZ1sHOz9fTy8HR?= wrote:
> Glenn, is the general plan of putting a openat() emulation into libast
> acceptable for you? I found that Roland wrote one in 2004 with threads
> in mind, and that it only needs polishing and testing. If you agree to
> take it I can spend some time this evening on it.
> Olga
> On Thu, Aug 16, 2012 at 1:20 AM, Glenn Fowler <g...@research.att.com> wrote:
> >
> > On Thu, 16 Aug 2012 01:09:29 +0200 =?KOI8-R?B?z8zYx8Egy9LZ1sHOz9fTy8HR?=
> > wrote:
> >> Glenn, have you ever considered putting an openat(), fstatat(),
> >> mkfifoat() emulation into libast, if the base operating system does
> >> not have such calls? I have been trying more tests with the at() apis
> >> but I am not happy to trash much of libshell with lots of #ifdef
> >> AT_CWD tests if there is a better option.
> >
> >> AFAIK a lot of the at() calls can be emulated by using
> >> /dev/fd/${dirfd}/${path} or /proc/${pid}/fd/${dirfd}/${path}. I just
> >> do not know, are there cases where /dev/fd or /proc/${pid}/fd are not
> >> available (chroot environments?)?
> >
> > there are a lot of systems with lame or no /proc
> > and it will be hard to work around systems with no O_search
> >
> > but let me think a bit on that
> > if we didn't have to worry about dir fd's across exec (probably rare right
> > now)
> > we might be able to cache emulated open(O_search) paths with <dev,ino> keys
> > on systems that don't support /dev/fd/<FD>/<PATH> pr
> > /proc/<PID>/fd/<FD>/<PATH>
> >> Olga
> >> --
> >> , _ _ ,
> >> { \/`o;====- Olga Kryzhanovska -====;o`\/ }
> >> .----'-/`-/ olga.kryzhanov...@gmail.com \-`\-'----.
> >> `'-..-| / http://twitter.com/fleyta \ |-..-'`
> >> /\/\ Solaris/BSD//C/C++ programmer /\/\
> >> `--` `--`
> >
> --
> , _ _ ,
> { \/`o;====- Olga Kryzhanovska -====;o`\/ }
> .----'-/`-/ olga.kryzhanov...@gmail.com \-`\-'----.
> `'-..-| / http://twitter.com/fleyta \ |-..-'`
> /\/\ Solaris/BSD//C/C++ programmer /\/\
> `--` `--`
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