int32_t
netifwstat(Netif *nif, Chan *c, uint8_t *db, int32_t n)
{
Proc *up = externup();
Dir *dir;
Netfile *f;
int l;
f = nif->f[NETID(c->qid.path)];
if(f == 0)
error(Enonexist);
if(netown(f, up->user, OWRITE) < 0)
error(Eperm);
dir = smalloc(sizeof(Dir)+n);
l = convM2D(db, n, &dir[0], (char*)&dir[1]);
if(l == 0){
free(dir);
error(Eshortstat);
}
if(!emptystr(dir[0].uid))
strncpy(f->owner, dir[0].uid, KNAMELEN);
if(dir[0].mode != (uint32_t)~0UL)
f->mode = dir[0].mode;
free(dir);
return l;
}
int netifwstat(struct ether *nif, struct chan *c, uint8_t * db, int n)
{
struct dir *dir;
struct netfile *f;
int m;
f = nif->f[NETID(c->qid.path)];
if (f == 0) {
set_errno(ENOENT);
error(Enonexist);
}
if (netown(f, current->user, OWRITE) < 0)
error(Eperm);
dir = kzmalloc(sizeof(struct dir) + n, 0);
m = convM2D(db, n, &dir[0], (char *)&dir[1]);
if (m == 0) {
kfree(dir);
error(Eshortstat);
}
if (!emptystr(dir[0].uid))
strncpy(f->owner, dir[0].uid, KNAMELEN);
if (dir[0].mode != ~0UL)
f->mode = dir[0].mode;
kfree(dir);
return m;
}
/*
* Increment the reference count of a network device.
* If id < 0, return an unused ether device.
*/
static int openfile(struct ether *nif, int id)
{
ERRSTACK(1);
struct netfile *f, **fp, **efp;
if (id >= 0) {
f = nif->f[id];
if (f == 0)
error(Enodev);
qlock(&f->qlock);
qreopen(f->in);
f->inuse++;
qunlock(&f->qlock);
return id;
}
qlock(&nif->qlock);
if (waserror()) {
qunlock(&nif->qlock);
nexterror();
}
efp = &nif->f[nif->nfile];
for (fp = nif->f; fp < efp; fp++) {
f = *fp;
if (f == 0) {
f = kzmalloc(sizeof(struct netfile), 0);
if (f == 0)
exhausted("memory");
/* since we lock before netifinit (if we ever call that...) */
qlock_init(&f->qlock);
f->in = qopen(nif->limit, Qmsg, 0, 0);
if (f->in == NULL) {
kfree(f);
exhausted("memory");
}
*fp = f;
qlock(&f->qlock);
} else {
qlock(&f->qlock);
if (f->inuse) {
qunlock(&f->qlock);
continue;
}
}
f->inuse = 1;
qreopen(f->in);
netown(f, current->user, 0);
qunlock(&f->qlock);
qunlock(&nif->qlock);
poperror();
return fp - nif->f;
}
error(Enodev);
return -1; /* not reached */
}
/*
* Increment the reference count of a network device.
* If id < 0, return an unused ether device.
*/
static int
openfile(Netif *nif, int id)
{
Proc *up = externup();
Netfile *f, **fp, **efp;
if(id >= 0){
f = nif->f[id];
if(f == 0)
error(Enodev);
qlock(&f->q);
qreopen(f->iq);
f->inuse++;
qunlock(&f->q);
return id;
}
qlock(&nif->q);
if(waserror()){
qunlock(&nif->q);
nexterror();
}
efp = &nif->f[nif->nfile];
for(fp = nif->f; fp < efp; fp++){
f = *fp;
if(f == 0){
f = malloc(sizeof(Netfile));
if(f == 0)
exhausted("memory");
f->iq = qopen(nif->limit, Qmsg, 0, 0);
if(f->iq == nil){
free(f);
exhausted("memory");
}
*fp = f;
qlock(&f->q);
} else {
qlock(&f->q);
if(f->inuse){
qunlock(&f->q);
continue;
}
}
f->inuse = 1;
qreopen(f->iq);
netown(f, up->user, 0);
qunlock(&f->q);
qunlock(&nif->q);
poperror();
return fp - nif->f;
}
error(Enodev);
return -1; /* not reached */
}
Chan*
netifopen(Netif *nif, Chan *c, int omode)
{
Proc *up = externup();
int id;
Netfile *f;
id = 0;
if(c->qid.type & QTDIR){
if(omode != OREAD)
error(Eperm);
} else {
switch(NETTYPE(c->qid.path)){
case Ndataqid:
case Nctlqid:
id = NETID(c->qid.path);
openfile(nif, id);
break;
case Ncloneqid:
id = openfile(nif, -1);
c->qid.path = NETQID(id, Nctlqid);
break;
default:
if(omode != OREAD)
error(Ebadarg);
}
switch(NETTYPE(c->qid.path)){
case Ndataqid:
case Nctlqid:
f = nif->f[id];
if(netown(f, up->user, omode&7) < 0){
netifclose(nif, c);
error(Eperm);
}
break;
}
}
c->mode = openmode(omode);
c->flag |= COPEN;
c->offset = 0;
c->iounit = qiomaxatomic;
return c;
}
struct chan *netifopen(struct ether *nif, struct chan *c, int omode)
{
int id;
struct netfile *f;
id = 0;
if (c->qid.type & QTDIR) {
if (!IS_RDONLY(omode))
error(Eperm);
} else {
switch (NETTYPE(c->qid.path)) {
case Ndataqid:
case Nctlqid:
id = NETID(c->qid.path);
openfile(nif, id);
break;
case Ncloneqid:
id = openfile(nif, -1);
c->qid.path = NETQID(id, Nctlqid);
break;
default:
if (!IS_RDONLY(omode))
error(Ebadarg);
}
switch (NETTYPE(c->qid.path)) {
case Ndataqid:
case Nctlqid:
f = nif->f[id];
if (netown(f, current->user, omode & 7) < 0)
error(Eperm);
break;
}
}
c->mode = openmode(omode);
c->flag |= COPEN;
c->offset = 0;
c->iounit = qiomaxatomic;
return c;
}