[Forwarding email since somehow the ast-developers@ list has issues
with postings from Olga's address... ;-( ]
---------- Forwarded message ----------
From: ольга крыжановская <olga.kryzhanov...@gmail.com>
Date: Wed, Aug 29, 2012 at 7:36 AM
Subject: Fwd: Per thread open(), stat(), rename() and so on, and *at() API
To: Roland Mainz <roland.ma...@nrubsig.org>
Wenn du wach bist schick es bitte nochmal an
ast-developers@research.att.com. Meine mail ist im spam-filter
hangengeblieben.
---------- Forwarded message ----------
From: ольга крыжановская <olga.kryzhanov...@gmail.com>
Date: Wed, Aug 29, 2012 at 6:54 AM
Subject: Per thread open(), stat(), rename() and so on, and *at() API
To: Glenn Fowler <g...@research.att.com>, David Korn
<d...@research.att.com>, Phong Vo <k...@research.att.com>
Cc: ast-developers@research.att.com
Glenn, I have an alternative for your per thread open(), stat(),
rename() and so on API plans:
Instead of creating AST wrapper code for open(), stat(), rename() and
so we could use the following macros, defined in <ast/fcntl.h>:
------------------cutme------------------------
#define unlink(path)
unlinkat(AST_GET_CURRENT_THREAD_CWD_FD(), (path), 0)
#define rmdir(path)
unlinkat(AST_GET_CURRENT_THREAD_CWD_FD(),
(path), AT_REMOVEDIR)
#define chown(path, uid,
gid) fchownat(AST_GET_CURRENT_THREAD_CWD_FD(), (path), (uid), (gid),
0)
#define lchown(path, uid, gid)
fchownat(AST_GET_CURRENT_THREAD_CWD_FD(), (path), (uid), (gid),
AT_SYMLINK_NOFOLLOW)
#define stat(path, sb) fstatat(AST_GET_CURRENT_THREAD_CWD_FD(),
(path), (sb), 0)
#define lstat(path, sb) fstatat(AST_GET_CURRENT_THREAD_CWD_FD(),
(path), (sb), AT_SYMLINK_NOFOLLOW)
#define rename(oldname,
newname) renameat(AST_GET_CURRENT_THREAD_CWD_FD(), (oldname),
AST_GET_CURRENT_THREAD_CWD_FD(), (newname))
#define access(path,
amode) faccessat(AST_GET_CURRENT_THREAD_CWD_FD(), (path), (amode), 0)
#define eaccess(path,
amode) faccessat(AST_GET_CURRENT_THREAD_CWD_FD(), (path), (amode),
AT_EACCESS)
#define mkdir(path, amode) mkdirat(AST_GET_CURRENT_THREAD_CWD_FD(),
(path), (amode))
#define mkfifo(path, amode)
mkfifoat(AST_GET_CURRENT_THREAD_CWD_FD(),
(path), (amode))
#define mknod(path, amode,
adev) mknodat(AST_GET_CURRENT_THREAD_CWD_FD(), (path), (amode),
(adev))
#define readlink(path, buf,
bufsize) readlinkat(AST_GET_CURRENT_THREAD_CWD_FD(), (path), (buf),
(bufsize))
#define symlink(oldpath, newpath) symlinkat((oldpath),
AST_GET_CURRENT_THREAD_CWD_FD(), (newpath))
------------------cutme------------------------
AST_GET_CURRENT_THREAD_CWD_FD() would be defined to be a preprocessor
macro, which will be a function returning the current thread's cwd fd;
if there is none allocated for this thread yet it will be done by
within that function, using open(".", O_search).
However, consumers of the <ast/fcntl.h> header are _free_ to redefine
this macro, for example src/cmd/ksh93/include/defs.h could define
AST_GET_CURRENT_THREAD_CWD_FD() as
#define AST_GET_CURRENT_THREAD_CWD_FD() (shp->pwdfd)
This would, at least, save the function call overhead, and finally
make use of (shp->pwdfd) as it was intended.
What do you think? It would make things easier for you to implement,
i.e. you only have to implement the per thread
AST_GET_CURRENT_THREAD_CWD_FD(), and applications are free to use the
*at() API if they wish to.
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 /\/\
`--` `--`
--
__ . . __
(o.\ \/ /.o) roland.ma...@nrubsig.org
\__\/\/__/ MPEG specialist, C&&JAVA&&Sun&&Unix programmer
/O /==\ O\ TEL +49 641 3992797
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