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Support interface attributes as pseudoroots. This makes things like

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"pseudo-root audiobus*" possible.
This commit is contained in:
pooka 2010-05-01 22:17:58 +00:00
parent bb702d3252
commit 194e1c80bc
1 changed files with 42 additions and 2 deletions
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44
usr.bin/config/sem.c
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@ -1,4 +1,4 @@
/* $NetBSD: sem.c,v 1.35 2010/04/30 20:47:18 pooka Exp $ */
/* $NetBSD: sem.c,v 1.36 2010/05/01 22:17:58 pooka Exp $ */
/*
* Copyright (c) 1992, 1993
@ -1410,17 +1410,57 @@ deldev(const char *name)
void
addpseudoroot(const char *name)
{
char buf[NAMESIZE];
int unit;
struct attr *attr;
struct devi *i;
struct deva *iba;
struct devbase *ib;
fprintf(stderr, "WARNING: pseudo-root is an experimental feature\n");
if (split(name, strlen(name), buf, sizeof(buf), &unit)) {
cfgerror("invalid pseudo-root name `%s'", name);
return;
}
/*
* Assume given pseudoroot is an interface attribute. If it
* is, do stunts. If it isn't, try a device next.
*/
attr = ht_lookup(attrtab, intern(buf));
if (attr && attr->a_iattr) {
struct devbase *fakedev;
char fakename[NAMESIZE];
/*
* here we cheat a bit: create a fake devbase with the
* interface attribute and instantiate it. quick, cheap,
* dirty & bad for you, much like the stuff in the fridge.
* and, it works, since the pseudoroot device is not included
* in ioconf, just used by config to make sure we start from
* the right place.
*/
snprintf(fakename, sizeof(fakename), "%sattrs", buf);
fakedev = getdevbase(intern(fakename));
fakedev->d_isdef = 1;
fakedev->d_ispseudo = 0;
fakedev->d_attrs = newnv(NULL, NULL, attr, 0, NULL);
defdevattach(NULL, fakedev, NULL, NULL);
if (unit == STAR)
snprintf(buf, sizeof(buf), "%s*", fakename);
else
snprintf(buf, sizeof(buf), "%s%d", fakename, unit);
name = buf;
}
/* ok, everything should be set up, so instantiate a fake device */
i = getdevi(name);
if (i == NULL)
return;
ib = i->i_base;
iba = ib->d_ahead; /* XXX: take the first for now, revisit later */
iba = ib->d_ahead;
i->i_atdeva = iba;
i->i_cfflags = 0;