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  1.  Home
  2. RPG400-L
  3. August 2003

RE: IFS file in use

> Not that I've done that much with the IFS, but the way I read the
> manuals/Redbooks, if you want an exclusive lock, you need to add x'10'
> (exclusive use) to openflags to get the behavior you want.

Actually, that's not correct.

O_EXCL means "exclusively create."  You specify O_CREAT+O_EXCL when you
want open() to return an error if there's already a file by that name.
This way, you never accidentally change or overwrite an existing file.

Instead, Aaron probably wants to use the O_SHARE_xxx flags on the open()
call.  They are described here:
http://publib.boulder.ibm.com/iseries/v5r2/ic2924/info/apis/open.htm#HDROPNFLAG

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