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Date:      Fri, 14 Dec 2012 12:32:31 +0100
From:      "C. P. Ghost" <cpghost@cordula.ws>
To:        freebsd-questions@freebsd.org
Cc:        Jack Mc Lauren <jack.mclauren@yahoo.com>
Subject:   Re: Listen to file changes
Message-ID:  <CADGWnjUc=r=N9TwkSrG%2BAVx0bLuRjxAuK5GCCBXwijF01yyiYQ@mail.gmail.com>
In-Reply-To: <50CB08BD.2060302@qeng-ho.org>
References:  <1355478343.11175.YahooMailNeo@web160106.mail.bf1.yahoo.com> <20121214113457.970f6759.freebsd@edvax.de> <50CB08BD.2060302@qeng-ho.org>

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On Fri, Dec 14, 2012 at 12:08 PM, Arthur Chance <freebsd@qeng-ho.org> wrote:
> On 12/14/12 10:34, Polytropon wrote:
>>
>> On Fri, 14 Dec 2012 01:45:43 -0800 (PST), Jack Mc Lauren wrote:
>>>
>>> Hi all
>>> I want to monitor files access and change time. How can I
>>> listen to specific file or directory to monitor ? I'm coding with c.
>>
>>
>> If I remember correctly, what you're searching for does already
>> exist: FAM - the File Alteration Monitor. It's in the ports
>> collection (/usr/ports/devel/fam). There are also C++ and
>> Ruby bindings, maybe you can also interface with C...
>>
>> For C: Maybe using readdir() et al. could be useful? Also see
>> "man 5 inode", "man 5 dir" and "man 3 readdir" for more info.
>> And struct ufs2_dinode in /usr/include/ufs/ufs/dinode.h should
>> have the information you need to parse for; maybe also check
>> the FILE type in /usr/include/stdio.h for access flags.
>
> See also kevent(2) and the EVFILT_VNODE system filter.

Exactly. Check out how "tail -f" works in
/usr/src/usr.bin/tail/forward.c

-cpghost.

-- 
Cordula's Web. http://www.cordula.ws/



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