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On 2005.08.13 17:08:17 +0000, Hans Petter Selasky wrote:
| > Cloning devices are supported on NetBSD - e.g. /dev/bpf or /dev/ptmx
| > are such cloning devices.  The nodes in /dev are not created indeed, but
| > actual nodes are rarely needed anyway.
|=20
| Are you sure that this cloning process is dynamic. To me it looks very mu=
ch=20
| like bpf sets up "n" fixed units:

Not on 3.0+.

| # ls /dev/bpf*
| /dev/bpf0 /dev/bpf1 /dev/bpf2 /dev/bpf3 /dev/bpf4 /dev/bpf5 /dev/bpf6 /de=
v/bpf7
|=20
| crw-------  1 root  wheel  23, 0 Aug 12 14:42 /dev/bpf0
| crw-------  1 root  wheel  23, 1 Aug 12 14:42 /dev/bpf1
| crw-------  1 root  wheel  23, 2 Aug 12 14:42 /dev/bpf2
| crw-------  1 root  wheel  23, 3 Aug 12 14:42 /dev/bpf3
| crw-------  1 root  wheel  23, 4 Aug 12 14:42 /dev/bpf4
| crw-------  1 root  wheel  23, 5 Aug 12 14:42 /dev/bpf5
| crw-------  1 root  wheel  23, 6 Aug 12 14:42 /dev/bpf6
| crw-------  1 root  wheel  23, 7 Aug 12 14:42 /dev/bpf7

proton> ls /dev/bpf*                                                       =
 [~]
/dev/bpf   /dev/bpf0@
proton> ls -l /dev/bpf0                                                    =
 [~]
lrwx------  1 root  wheel  3 Jun 18 02:27 /dev/bpf0@ -> bpf

| When I look at the source code I find the following:
|=20
| int
| bpfopen(dev, flag, mode, p)
|         dev_t dev;
|         int flag;
|         int mode;
|         struct proc *p;
| {
|         struct bpf_d *d;
|=20
|         if (minor(dev) >=3D NBPFILTER)
|                 return (ENXIO);
|         /*
|          * Each minor can be opened by only one process.  If the requested
|          * minor is in use, return EBUSY.
|          */
|         d =3D &bpf_dtab[minor(dev)];
|                       ^^^^^^ does "specfs" assign minor=20
|                              when one opens "/dev/bpf" ?
|=20
|         if (!D_ISFREE(d))
|                 return (EBUSY);

int
bpfopen(dev, flag, mode, p)
        dev_t dev;
        int flag;
        int mode;
        struct proc *p;
{
        struct bpf_d *d;
        struct file *fp;
        int error, fd;

        /* falloc() will use the descriptor for us. */
        if ((error =3D falloc(p, &fp, &fd)) !=3D 0)
                return error;

        d =3D malloc(sizeof(*d), M_DEVBUF, M_WAITOK);
        (void)memset(d, 0, sizeof(*d));
        d->bd_bufsize =3D bpf_bufsize;
        d->bd_seesent =3D 1;
        d->bd_pid =3D p->p_pid;
        callout_init(&d->bd_callout);

        simple_lock(&bpf_slock);
        LIST_INSERT_HEAD(&bpf_list, d, bd_list);
        simple_unlock(&bpf_slock);

        return fdclone(p, fp, fd, flag, &bpf_fileops, d);
	       ^^^^^^^
}

| To me it looks that one has to open /dev/bpfN.
|=20
| # cat /dev/bpf
| cat: /dev/bpf: No such file or directory

proton# cat /dev/bpf                                                       =
 [~]
cat: /dev/bpf: Invalid argument

| Maybe it has got something to do with the version I am using:

Yes. :)

		-- Rui Paulo

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