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Re: SKIP_LUN on internet sockets? [message #50416]

Mon, 02 October 2006 14:04

news.verizon.net
Messages: 47
Registered: August 2003

Member

Wayne Landsman wrote:
>
> % SKIP_LUN: Operation is invalid on a socket. Unit: 100, File:

My own followup. I've discovered that SKIP_LUN also cannot be used on
a Unix pipe.

% SKIP_LUN: Operation is invalid on a pipe. Unit: 108, File:
<uncompress>

So it seems that SKIP_LUN cannot be used in the precisely the cases
where it would be useful - an internet socket and a Unix pipe.
These are the cases where to advance the file pointer, one must
currently read data into a a dummy IDL variable.

SKIP_LUN can be used on a file opened with /COMPRESS but it is no
faster than POINT_LUN.
And for a regular file, SKIP_LUN is much, much slower than POINT_LUN.

So probably the documenation for SKIP_LUN should simply read "Do not
use" (except for skipping text with the /LINES keyword).

--Wayne

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