Path: utzoo!attcan!uunet!husc6!bloom-beacon!mit-eddie!ll-xn!ames!pasteur!ucbvax!UBVMSC.CC.BUFFALO.EDU!ACSCCRA
From: ACSCCRA@UBVMSC.CC.BUFFALO.EDU ("Curtis R. Anderson")
Newsgroups: comp.os.vms
Subject: RE: Querry on interactive /batch users .
Message-ID: <8805241903.AA14925@ucbvax.Berkeley.EDU>
Date: 23 May 88 14:48:00 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 20

>EASY QUESTION:
> 
> Does any one know of a fucntion, system service, or anything that may be
>called from a high level langauge (Pascal, C) that would do the same as
>VMS's $ SHOW USERS <user_name> ?
> I would like to check if a user is signed on (interactive or batch)
>without doing LIB$SPAWN('$ SHOW USERS auser')
> Is there a simpler  way??

Sure.  Use LIB$GETJPI, passing JPI$_USERNAME as the first parameter, and -1 for
the initial PID.  Make sure the PID is in a variable so the call can change it.
Insure you have a descriptor ready to receive at least 12 characters.  Don't
forget turning on WORLD privilege. 

See the entry for LIB$GETJPI in the Run-time Library Routines reference
for exact order of parameters.  I think you need three or four parameters.

  --Curtis

Batteries not included.