Date: Wed, 12 May 2010 23:25:25 +0400 From: pluknet <pluknet@gmail.com> To: gljennjohn@googlemail.com Cc: freebsd-hackers@freebsd.org, Knowledge Seeker <knoseeker@googlemail.com> Subject: Re: utimes(2): changing the birth time Message-ID: <AANLkTim7Cf6nznLJgZQj-vxQtC5ec-cx-uLe8fGHbsRN@mail.gmail.com> In-Reply-To: <20100512203825.1db158db@ernst.jennejohn.org> References: <AANLkTimzR-yTu6S5C49bojmGvGrQ1wQRvcjhKcrlJTg-@mail.gmail.com> <20100512203825.1db158db@ernst.jennejohn.org>
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On 12 May 2010 22:38, Gary Jennejohn <gljennjohn@googlemail.com> wrote: > On Wed, 12 May 2010 17:53:38 +0000 > Knowledge Seeker <knoseeker@googlemail.com> wrote: > >> Hi, >> Is there a way to set birth time to a value greater(newer) than the actu= al >> birth time (not in the future, but not the current time)? >> The man page utimes(2) says that is only possible to change to an older >> value. >> >> I saw a way to do this by opening a new file, coping the data, setting t= he >> other attributes, then calling utimes 2 times to set the birth and the >> modification time. >> >> Is there a way to change it without creating a new file? >> > > Not with the current code. =A0vfs_syscalls.c:setutimes() explicitly check= s > that the new time is less than va_birthtime. > > Interestingly enough, there's code in the routine to handle what this > comment in utimes(2) mentions, but it's not implemented yet. > > "Ideally a new system call will be added that allows the setting of all > three times at once." > btw, there's a paper someone can find something interesting at. http://www.usenix.org/events/bsdcon03/tech/full_papers/mckusick/mckusick_ht= ml/ --=20 wbr, pluknet
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