differences between "PROGRAM" and "RUN" (RUN+) (version 089)

differences between "PROGRAM" and "RUN" (RUN+) (version 089)

[Mark Ryden]

Hello,

from man udev (of last version,089):

PROGRAM
Call external program. This key is valid if the program returns
  successful. The environment variables of udev are also available
	to the program.The string returned by the program may be
	additionally matched with the RESULT key in the same or
	any later rule.

RUN
  Add a program to the list of programs to be executed for
	a specific device.
	
Can anyone please elaborate a little on the differences between "PROGRAM" and
"RUN" (RUN+) ?

Are the environment variables of udev available when
using "run"?
When must we use RUN (RUN+) and when must we use PROGRAM ?
Are there cases when using RUN or PROGRAN  is both OK?


Regaes,
Mark


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Re: differences between "PROGRAM" and "RUN" (RUN+) (version 089)

[Kay Sievers]

On Mon, Apr 10, 2006 at 05:12:01PM +0300, Mark Ryden wrote:
> from man udev (of last version,089):
> 
> PROGRAM
> Call external program. This key is valid if the program returns
>   successful. The environment variables of udev are also available
> 	to the program.The string returned by the program may be
> 	additionally matched with the RESULT key in the same or
> 	any later rule.
> 
> RUN
>   Add a program to the list of programs to be executed for
> 	a specific device.
> 	
> Can anyone please elaborate a little on the differences between "PROGRAM" and
> "RUN" (RUN+) ?
> 
> Are the environment variables of udev available when
> using "run"?
> When must we use RUN (RUN+) and when must we use PROGRAM ?
> Are there cases when using RUN or PROGRAN  is both OK?

PROGRAM runs before the device node is created and usually used to return a
string to name a node. RUN is a list of programs to be executed after all
node processing. While PROGRAM is executed not all variables are
available.

Kay


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