Re: What does 'udevtrigger' & 'udevsettle' stand for?!

[Bryan Kadzban <bryan@kadzban.is-a-geek.net>]

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Aaron Griffin wrote:
> Yeah, but there is a fine line there.  I mean, why don't all unix 
> tools read from stdin only, and force 'cat' usage to read files?

Because you would do this:

whatever-prog </path/to/file

or this:

</path/to/file whatever-prog

, not this:

cat /path/to/file | whatever-prog

, and the file-reading would be done by whatever-prog, not by both cat
and whatever-prog.  (whatever-prog would still have to read() from stdin
if you used a pipe; the only difference is where stdin comes from.)  ;-P

(See also the "useless use of cat" page [1].)

> Neither udevtrigger nor udevsettle have any use case outside of 
> initializing udevd.

If you assume that udevd starts up every time the uevent files need to
be poked, that'd be true.  But I don't believe that's the case: I've
poked all the uevent files many times, while doing testing of various
udev versions and rule packages.  udevd was already running; restarting
it would be a pain. (Especially if I'm currently inside a chroot, though
that doesn't usually happen.)

I'd agree that most people don't find much use in having udevtrigger be
separate, but some do.  And udevsettle is used in some cases without
udevtrigger but while udevd is up (for instance, after repartitioning,
to wait for the new hdXY or sdXY devices to show up).

[1] http://laku19.adsl.netsonic.fi/~era/unix/award.html

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