Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!elroy.jpl.nasa.gov!decwrl!pa.dec.com!news
From: reising@colsw3.enet.dec.com (new to Ultrix)
Newsgroups: comp.os.os9
Subject: Re: open() + sharable file = no disk
Keywords: Sharable, open
Message-ID: <1991Jun12.150304.23170@pa.dec.com>
Date: 12 Jun 91 15:03:04 GMT
References: <1991Jun11.012640.904@tkou02.enet.dec.com> <43@kilroy.chi.il.us>
Sender: news@pa.dec.com (News)
Reply-To: Reising@colsw3.enet.dec.com
Distribution: usa
Organization: Digital Equipment Corporation
Lines: 43

In article <43@kilroy.chi.il.us>, ekuns@kilroy.chi.il.us (Eddie Kuns) writes:
|>From: ekuns@kilroy.chi.il.us (Eddie Kuns)
|>Subject: Re: open() + sharable file = no disk
|>Date: Wed, 12 Jun 91 04:49:47 GMT-12303291:44

|>
|>zambotti@wpowz.enet.dec.com (Walter Zambotti DEC) writes:
|>
|>#include <modes.h>
|>
|>    ....
|>
|>        /* open the active file in non-sharable mode, read-write */
|>        activepath = open(NGROUPS, S_IREAD | S_IWRITE | S_ISHARE);
|>        if (activepath == 0)
----------------->       ^^^-- should it be (activepath < 0) /* or == -1 */ ?


|>        {       printf("readactive: can't open active file\n");
|>                exit(0);
|>        }
|>
|>And this code works.  (Other processes who open the file sleep until
|>this process closes the file.  They then awaken and can open the file.)
|>
|>I also use the Dev Sys RAM Disk, and haven't noticed any weird behavior
|>with it.  (The file I open above is not on the RAM disk.)
|>
|>My suggestion:  If you're not using Carl Kreider's C library, you should
|>get it.  It may fix the above problem; it is much more capable,
|>faster, and smaller.
|>
 /jr

--
######################################################################
    Josef Reisinger    (Software Quality never goes out of style...)
    Digital Equipment Corporation    
    D-5000 Koeln
    Stolberger Strasse

reisinger@col01.enet.dec.com                   ! VAX/VMS via USA
...unido!decum!col01.enet!reisinger            ! VAX/VMS in EUROPE
######################################################################