Re: Using a UUID to name an IFS file

[Scott Klement <midrange-l@xxxxxxxxxxxxxxxx>]

Hi Rob,


> Ok, two people mentioned tmpnam(), and they're from different companies 
> therefore it's probably not some custom code internal to that shop. 


Did you really think I'd suggest code that's internal to my shop? 
(Unless, of course, I posted it)

> 1 - What is tmpnam()?  Where is some documentation?

Actually, there are two tmpnam() APIs, both provided by IBM and part of 
the ILE C/C++ runtime library and documented in the "ILE C/C++ Run-time 
Library Functions" manual in the Information Center.

There's a tmpnam() procedure for IFS filenames that comes up with a new, 
unique name that's in the root file system.  Here's an example of that:

     H BNDDIR('QC2LE')

     D tmpnam          PR              *   extproc('_C_IFS_tmpnam')
     D   string                      39A   options(*omit)
     d filename        s             40A   varying

     C                   eval      filename = %str(tmpnam(*omit))

Then, there's a different one for traditional lib/objects:

     H BNDDIR('QC2LE')

     D tmpnam          PR              *   extproc('tmpnam')
     D   string                      39A   options(*omit)

     d filename        s             40A   varying

      /free

           filename = %str(tmpnam(*OMIT));

Note that the IFS one has a different EXTPROC() from the non-IFS one.  I 
suspect you want my first example (the IFS one).

> 2 - What I am doing is generating a temporary file in the IFS and then 
> sending it off with SNDEMAIL.  Would tmpnam() be applicable for that? 
> Keeping in mind that SNDEMAIL isn't necessarily "instantaneous".

Yes, tmpnam() guarantees that there's no other file with the same name 
(at the time it's called) on your system. So it's ideally suited to 
stuff that needs the QtmmSendMail() API like SNDEMAIL.