RE: open() vs open64() (Was: Re: MCH3601 error (Bob Cozzi))

Right, but the question was concerning the read() function not open64(). My
point was that read() (the same read() function) works with both forms of
the open() and open64() functions.

-Bob Cozzi
www.RPGxTools.com
If everything is under control, you are going too slow.
- Mario Andretti


-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Chris Wolcott
Sent: Wednesday, July 06, 2005 9:09 PM
To: rpg400-l@xxxxxxxxxxxx
Subject: open() vs open64() (Was: Re: MCH3601 error (Bob Cozzi))

The 64 bit versions are specifically for reading files over 4GB.  Using
the standard 32 bit C APIs, you can not open a 4GB+ file.  In 'C' you
need to specify 'SYSIFCOPT(*IFS64IO)' on the create command to get the
64 bit APIs.  (*IFSIO gets you the 'standard' 32 bit APIs.)

> The APIs are prototype don the rpgiv.com website.
> http://www.rpgiv.com/downloads/
> 
> The directly link to the page you want is:
>
http://www.rpgiv.com/cgi-rpg/viewsrc?FILE=QCPYSRC&LIB=RPGLAB&MBR=IFSPROT
OS
> 
> Read and Write use either "handle" to read the data. You have, what
about
> a
> 2GB "limit" on the data you read at once, but that doesn't mean you
can't
> read multiple times to get all the data.
> Scott K. would know this stuff best, but I don't think it matters
which
> open() or open64() you use when reading the file. I always use
open64()
> since it is actually 'faster' according to IBMers.