Did you see,
 
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/ceea3190/2.2.5.69
.1 

which says (in part),
 "z/OS UNIX considerations--IMS supports only applications that use the
POSIX(ON) run-time option from a single thread."

You don't say, but I *assume* you are not running under USS. In which case,
the statement at:
 
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/ceea3190/1.2.44.1

that says,
 "You can specify POSIX(ON) for both DB2R and IMS applications."
probably prevails.

"P S" <[email protected]> wrote in message
news:<[email protected]>...
> In reading various LE and IMS documentation, I've come to the
> [conc][de]lusion that invoking a set of C functions that require
> POSIX(ON) won't be that hard under IMS (as opposed to, say, CICS,
> where it basically doesn't work without a lot of undocumented
> environmental setup).
> 
> Anyone done this? Any surprises/gotchas you can share? I see that
> specifying the POSIX(ON) is different for IMS, but that's documented.
> 
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