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

--- a/sys/src/9/port/devpipe.c

+++ b/sys/src/9/port/devpipe.c

@@ -14,6 +14,7 @@

 	Pipe	*next;

 	int	ref;

 	ulong	path;

+	long	perm;

 	Queue	*q[2];

 	int	qref[2];

 };

@@ -80,6 +81,7 @@

 	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 @@

 		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 @@

 		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 @@

 	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 @@

 	pipewrite,

 	pipebwrite,

 	devremove,

-	devwstat,

+	pipewstat,

 };

-- 

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