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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