Date: Wed, 12 May 2010 20:38:25 +0200 From: Gary Jennejohn <gljennjohn@googlemail.com> To: Knowledge Seeker <knoseeker@googlemail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: utimes(2): changing the birth time Message-ID: <20100512203825.1db158db@ernst.jennejohn.org> In-Reply-To: <AANLkTimzR-yTu6S5C49bojmGvGrQ1wQRvcjhKcrlJTg-@mail.gmail.com> References: <AANLkTimzR-yTu6S5C49bojmGvGrQ1wQRvcjhKcrlJTg-@mail.gmail.com>
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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 actual > 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 the > 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. vfs_syscalls.c:setutimes() explicitly checks 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." -- Gary Jennejohn
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