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lib9p: add "authok" flag to Srv struct

We want to implement "none" attaches for hjfs,
but only if the 9p-"channel" ran a successfull
authentication before, to prevent anonymous
remote mounts as "none".

Add a flag to the Srv struct for this.

--- a/sys/include/9p.h

+++ b/sys/include/9p.h

@@ -233,6 +233,7 @@

 	Ref	rref;	/* requests in flight */

 	int	spid;	/* pid of srv() caller */

+	int	authok;	/* auth was done on this channel (for none) */

 	void	(*forker)(void (*)(void*), void*, int);

 	void	(*free)(Srv*);

--- a/sys/src/lib9p/listen.c

+++ b/sys/src/lib9p/listen.c

@@ -30,6 +30,7 @@

 	memset(&s->sref, 0, sizeof(s->sref));

 	memset(&s->rref, 0, sizeof(s->rref));

 	s->spid = 0;

+	s->authok = 0;

 	s->free = nil;

 	if(s->forker == nil)

-- 

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