Re: Connector - how to start?

[Paul Collins <paul@briny.ondioline.org>]

Evgeniy Polyakov <johnpol@2ka.mipt.ru> writes:

> On Sat, Apr 15, 2006 at 12:50:46PM +0200, Libor Vanek (libor.vanek@gmail.com) wrote:
>> Hi
>
> Hello.
>
>> > Why do you want to send big messages over netlink?
>> > Netlink is fast but not faster than char device for example, or read
>> > from mapped area, although it is much more convenient to use.
>> >
>> > Well, I can increase CONNECTOR_MAX_MSG_SIZE to maximum allowed 64k, if
>> > there is really strong justification.
>> 
>> I need to send messages containing several (1 to 3) file names. And
>> "MAXPATHLEN" is 1024b (usually it's much less but I can't rely on
>> that).
>
> $ touch `perl -e 'print "A"x1024'`
> touch: cannot touch
> `AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA':
> File name too long
>
> Only 255 is allowed in my system.

There are two limits though, the component length limit (NAME_MAX),
and the overall length limit (PATH_MAX).  For example:

$ mkdir -p `perl -e 'print "A"x255'`/`perl -e 'print "B"x255'`/`perl -e 'print "C"x255'`/`perl -e 'print "D"x255'`

works fine here.

However, with 256 I get "File name too long", as you did.

-- 
Dag vijandelijk luchtschip de huismeester is dood