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.