Date: 07 Jul 1999 10:10:19 +0300 From: Ville-Pertti Keinonen <will@iki.fi> To: zzhang@cs.binghamton.edu (Zhihui Zhang) Cc: hackers@freebsd.org Subject: Re: Overwrite an executable file that is running Message-ID: <86pv25q6jo.fsf@not.demophon.com> In-Reply-To: zzhang@cs.binghamton.edu's message of "7 Jul 1999 05:11:56 %2B0300" References: <Pine.GSO.3.96.990706215025.18513A-100000@sol.cs.binghamton.edu>
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zzhang@cs.binghamton.edu (Zhihui Zhang) writes:
> For a big executable file that is being run by the OS, all its contents
> may not be loaded into the memory. At the same time, the developer gets
> impatient and wants to create a new version of the same file. He could
> modify the makefile to output the new version to a different file name,
> but this is tedious. This new version should not overwrite the older
> verion of the file being run. My question is how FreeBSD prevents this
> from happening? Can anyone point out for me where in the source code this
It is prevented by not allowing it. A file cannot simultaneously be
executing and opened for writing.
To find the relevant bits in the sources, try:
grep ETXTBSY /sys/kern/*
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