nieh@nnn.crd.ge.com (09/21/89)
I have an ASCII file which is owned by me. I constantly update the file. Some of my colleagues will aceess (read-only) this file regularly. How do I detect who and when the file gets accessed ? It is a very primitive bulletin board. I don't want to build programs to manage this file. Thanks, -- Ko-Haw Nieh General Electric Company | nieh@crd.ge.com Corporate Research and Development | uunet!crd.ge.com!nieh P.O BOX 8, K1-ES224 | FAX : 518-387-7258 Schenectady, NY 12301 | TEL : 518-387-7431
maart@cs.vu.nl (Maarten Litmaath) (09/22/89)
nieh@nnn.crd.ge.com writes:
\I have an ASCII file which is owned by me. I constantly update the file.
\Some of my colleagues will aceess (read-only) this file regularly.
\How do I detect who and when the file gets accessed ?
\It is a very primitive bulletin board. I don't want to build programs
\to manage this file.
One simple program is enough. You let it register the user before accessing
the file. In order to make it impossible to bypass the program, you make it
setuid and you chmod 600 the ASCII file.
One problem: to prevent race conditions when updating the user register,
you have to use some locking mechanism.
--
creat(2) shouldn't have been create(2): |Maarten Litmaath @ VU Amsterdam:
it shouldn't have existed at all. |maart@cs.vu.nl, mcvax!botter!maartgwyn@smoke.BRL.MIL (Doug Gwyn) (09/22/89)
In article <3322@solo10.cs.vu.nl> maart@cs.vu.nl (Maarten Litmaath) writes: >One problem: to prevent race conditions when updating the user register, >you have to use some locking mechanism. Not if it is opened in append mode and a log entry is done with a single, small write.
cpcahil@virtech.UUCP (Conor P. Cahill) (09/22/89)
In article <NIEH.89Sep21095615@nnn.crd.ge.com>, nieh@nnn.crd.ge.com writes: > How do I detect who and when the file gets accessed ? You can't detect who, and you can only detect the last time the file was accessed. The only way to do it is to write your own program that controls access to the file and have the program log who is using it. -- +-----------------------------------------------------------------------+ | Conor P. Cahill uunet!virtech!cpcahil 703-430-9247 ! | Virtual Technologies Inc., P. O. Box 876, Sterling, VA 22170 | +-----------------------------------------------------------------------+
pcf@galadriel.bt.co.uk (Pete French) (09/22/89)
From article <NIEH.89Sep21095615@nnn.crd.ge.com>, by nieh@nnn.crd.ge.com: > > I have an ASCII file which is owned by me. I constantly update the file. > Some of my colleagues will aceess (read-only) this file regularly. > How do I detect who and when the file gets accessed ? A program called 'feel' wil do this for you - its kindd of the opposite of 'touch'. I have used this several times. But BSD dont appear to have it (man feel doesnt give anything here). Last time I saw it was a VAX 11-750 running 32V. -Pete. -- -Pete French. | "She stares at the screen, British Telecom Research Labs. | At the little words of green, Martlesham Heath, East Anglia. | Tries to remember what to do next." All my own thoughts (of course) | -N.M.A.