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devpipe: import pipe wstat() support to change permissions (import from sources)

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This commit is contained in:
cinap_lenrek 2012-12-04 10:40:08 +01:00
parent 98bd636424
commit b142e2a308
1 changed files with 36 additions and 4 deletions
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40
sys/src/9/port/devpipe.c
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@ -14,6 +14,7 @@ struct Pipe
Pipe *next;
int ref;
ulong path;
long perm;
Queue *q[2];
int qref[2];
};
@ -80,6 +81,7 @@ pipeattach(char *spec)
lock(&pipealloc);
p->path = ++pipealloc.path;
unlock(&pipealloc);
p->perm = pipedir[Qdata0].perm;
mkqid(&c->qid, NETQID(2*p->path, Qdir), 0, QTDIR);
c->aux = p;
@ -116,7 +118,7 @@ pipegen(Chan *c, char*, Dirtab *tab, int ntab, int i, Dir *dp)
break;
}
mkqid(&q, NETQID(NETID(c->qid.path), tab->qid.path), 0, QTFILE);
devdir(c, q, tab->name, len, eve, tab->perm, dp);
devdir(c, q, tab->name, len, eve, p->perm, dp);
return 1;
}
@ -161,10 +163,10 @@ pipestat(Chan *c, uchar *db, int n)
devdir(c, c->qid, ".", 0, eve, DMDIR|0555, &dir);
break;
case Qdata0:
devdir(c, c->qid, "data", qlen(p->q[0]), eve, 0600, &dir);
devdir(c, c->qid, "data", qlen(p->q[0]), eve, p->perm, &dir);
break;
case Qdata1:
devdir(c, c->qid, "data1", qlen(p->q[1]), eve, 0600, &dir);
devdir(c, c->qid, "data1", qlen(p->q[1]), eve, p->perm, &dir);
break;
default:
panic("pipestat");
@ -175,6 +177,36 @@ pipestat(Chan *c, uchar *db, int n)
return n;
}
static int
pipewstat(Chan* c, uchar* db, int n)
{
int m;
Dir *dir;
Pipe *p;
p = c->aux;
if(strcmp(up->user, eve) != 0)
error(Eperm);
if(NETTYPE(c->qid.path) == Qdir)
error(Eisdir);
dir = smalloc(sizeof(Dir)+n);
if(waserror()){
free(dir);
nexterror();
}
m = convM2D(db, n, &dir[0], (char*)&dir[1]);
if(m == 0)
error(Eshortstat);
if(!emptystr(dir[0].uid))
error("can't change owner");
if(dir[0].mode != ~0UL)
p->perm = dir[0].mode;
poperror();
free(dir);
return m;
}
/*
* if the stream doesn't exist, create it
*/
@ -387,5 +419,5 @@ Dev pipedevtab = {
pipewrite,
pipebwrite,
devremove,
devwstat,
pipewstat,
};