-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 According to Corinna Vinschen on 12/8/2005 3:30 AM: > > Hey, cool idea! There's no definition of O_DIRECT in Cygwin so far, but > this sounds like a worthwhile extension, at least for disk and tape > devices, but maybe also for files. This won't be in the next Cygwin > version 1.5.19, probably, but I'll certainly implement that for 1.5.20.
Another cool flag is newer Linux's O_NOATIME, which inhibits updating the access time. In particular, coreutils CVS has already added a -noatime option to dd (a nop unless the system supports it), and is considering moving to using O_NOATIME on directories for ls and other traversal routines, since POSIX allows ls to not change directory atime during traversal, and since listing directories is effectively a read-only operation that doesn't really need to write to disk just to update the directory atimes. If Windows FILE_FLAG_BACKUP_SEMANTICS can be used to avoid touching the atime, then this flag seems useful to implement for the 1.5.20 timeframe. While we are talking about wishes, Solaris and newer glibc provide the *at family of functions (such as openat); the cool thing about these functions is that they provide the ability to make directory traversal reentrant since with fd-relative semantics you no longer need to call chdir(). See for example http://lists.gnu.org/archive/html/bug-gnulib/2005-11/msg00042.html. - -- Life is short - so eat dessert first! Eric Blake [EMAIL PROTECTED] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (Cygwin) Comment: Public key at home.comcast.net/~ericblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFDmEEm84KuGfSFAYARAsd0AJ43Lun2yfiMdFHKXWt4Rq9bHwZV/ACfSn8O XXKWh5FBRn/V2BbLl+82NsU= =CzeF -----END PGP SIGNATURE----- -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
