[Linux-streams] Clone diver #2

[Gary Schumacher]

 

First of all I want to thank everybody that responded to my question last Fri.  I implement

your suggestions this weekend and how have a clone driver up and running! 

 

The next problem that I am trying to solve is a failure of a putmsg on this clone driver. 

I can open and do an ioctl to the driver but when I try to do a putmsg I get a "Function

not implemented" error message.  Using the debugging capabilities in streams did not

help me find the cause.  Being new to streams I would appreciate some suggestions before I

have pulled all of my hair out ;)

 

 

The code slice:

 

    fd1 = open ("/dev/swi", O_RDWR);
    if (fd1 < 0) {
        perror("/dev/swi");
        close (fd1);
    }

    /*---------------------
     * Set up stats request
     *---------------------*/

 

    (void) memset ((char *) &req, '\0', sizeof (req));
    req.dl_primitive = DL_GET_STATISTICS_REQ;

 

    ctlbuf.maxlen = 0;
    ctlbuf.len = sizeof (req);
    ctlbuf.buf = (char *) &req;

 

    if (putmsg (fd1, &ctlbuf, NULL, 0) < 0) {
        perror("putmsg");
        exit (-1);
    }

 

 

The resulti (with my debug messages):

 

 

PLSM3:/sw# ./swi_stats
swiopen entered: rq=0xc33bb200, devp=0xc33bfde4, dev_t=0xfb00000 flag=0x2, sflag=0x2, credp=0xc33bfdb0
swiopen: major=251, minor=0
swiopen:  minor dev = 0
swiopen: major=231, minor=0
swiopen: Device open
swiwput: db_type = 0x86 wq=0xc33bb2dc, mp=0xc3bf38e0
swiwput1 : db_type = 0x86 wq=0xc33bb2dc, mp=0xc3bf38e0
asw.c #1799: Queue pointer is NULL
NULL q, mp or q_next in putnext: called from file sw.c #1799
sswiclose: entered
swiclose: successful close cp= 0xc3ccd5a0
swi_stats: put failed
putmsg: Function not implemented

 

 

The "queue pointer is NULL" is the result of a FLUSH and I think that it is not a problem.  I am trying

to find the cause of the "putmsg: Function not implemented" message.  Any ideas?

 

Thanks
Gary

 

 

 

static struct module_info swiminfo = {
    0,                                  /* mi_idnum */ 
    SWINAME,                    /* mi_idname */
    SWIMINPSZ,                  /* mi_minpsz */
    SWIMAXPSZ,                  /* mi_maxpsz */
    SWIHIWAT,                   /* mi_hiwat     */
    SWILOWAT,                   /* mi_lowat */
};

 

static struct qinit swirinit = {
    swirput,                    /* qi_putp */
    swirsrv,                    /* qi_srvp */
    swiopen,                    /* qi_qopen */
    swiclose,                   /* qi_qclose */
    NULL,                       /* qi_qadmin */
    &swiminfo,                  /* qi_minfo */
    NULL,                       /* qi_mstat */
};

 

static struct qinit swiwinit = {
    swiwput,                    /* qi_putp */
    swiwsrv,                    /* qi_srvp */
    NULL,                       /* qi_qopen */
    NULL,                       /* qi_qclose */
    NULL,                       /* qi_qadmin */
    &swiminfo,                  /* qi_minfo */
    NULL,                       /* qi_mstat */
};

 

static struct streamtab swiinfo = {
    &swirinit,                  /* st_rdinit */
    &swiwinit,                  /* st_wrinit */
    NULL,                       /* st_muxrinit */
    NULL,                       /* st_muxwrinit */
};

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