Re: strange disk activity [tail -f]
Konstantin Olchanski (olchansk@mpsdaq.ags.bnl.gov)
5 Apr 1996 23:56:17 GMT
In article <199604020857.JAA16902@sable.ox.ac.uk>, Malcolm Beattie <mbeattie@sable.ox.ac.uk> writes:
> Ingo Molnar writes:
> > might be a stupid question, but is there no way doing event based reads
> > on files [selects and/or blocking reads at the end of the file] ?
>
> There was an extension to FFS for "watchdogs" which allowed user-mode
> programs to "guard" files and directories.
The SGI Irix has a similar facility,
called 'fam' (filesystem alteration monitor).
User-mode programs use an ioctl() to register their
interest in a file and then read kernel messages (such
as "files was changed", "file was deleted", etc...) from
/dev/imon.
C.O.