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lib9p: get rid of Srv.nopipe and Srv.leavefdsopen hacks

it is unclear how Srv.nopipe flag should work inside
postmountserv(). if a server wants to serve on stdio
descriptors, he can just call srv() after initializing
Srv.infd and Srv.outfd.

The Srv.leavefdsopen hack can be removed now that acme
win has been fixed.

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

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

@@ -215,9 +215,7 @@

 	int		infd;

 	int		outfd;

-	int		nopipe;

 	int		srvfd;

-	int		leavefdsopen;	/* magic for acme win */

 	char*	keyspec;

 /* below is implementation-specific; don't use */

--- a/sys/man/2/9p

+++ b/sys/man/2/9p

@@ -59,7 +59,6 @@

 	int		infd;

 	int		outfd;

 	int		srvfd;

-	int		nopipe;

 } Srv;

 .fi

 .PP

@@ -175,10 +174,7 @@

 .IR srv .

 They do the following:

 .IP

-If

-.IB s -> nopipe

-is zero (the common case),

-initialize

+Initialize

 .IB s -> infd

 and

 .IB s -> outfd

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

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

@@ -12,12 +12,11 @@

 {

 	int fd[2];

-	if(!s->nopipe){

-		if(pipe(fd) < 0)

-			sysfatal("pipe: %r");

-		s->infd = s->outfd = fd[1];

-		s->srvfd = fd[0];

-	}

+	if(pipe(fd) < 0)

+		sysfatal("pipe: %r");

+	s->infd = s->outfd = fd[1];

+	s->srvfd = fd[0];

+

 	if(name)

 		if(postfd(name, s->srvfd) < 0)

 			sysfatal("postfd %s: %r", name);

@@ -24,30 +23,11 @@

 	if(_forker == nil)

 		sysfatal("no forker");

-	_forker(postproc, s, RFNAMEG);

+	_forker(postproc, s, RFNAMEG|RFFDG|RFNOTEG);

-	/*

-	 * Normally the server is posting as the last thing it does

-	 * before exiting, so the correct thing to do is drop into

-	 * a different fd space and close the 9P server half of the

-	 * pipe before trying to mount the kernel half.  This way,

-	 * if the file server dies, we don't have a ref to the 9P server

-	 * half of the pipe.  Then killing the other procs will drop

-	 * all the refs on the 9P server half, and the mount will fail.

-	 * Otherwise the mount hangs forever.

-	 *

-	 * Libthread in general and acme win in particular make

-	 * it hard to make this fd bookkeeping work out properly,

-	 * so leaveinfdopen is a flag that win sets to opt out of this

-	 * safety net.

-	 */

-	if(!s->leavefdsopen){

-		rfork(RFFDG);

-		rendezvous(0, 0);

-		close(s->infd);

-		if(s->infd != s->outfd)

-			close(s->outfd);

-	}

+	close(s->infd);

+	if(s->infd != s->outfd)

+		close(s->outfd);

 	if(mtpt){

 		if(amount(s->srvfd, mtpt, flag, "") == -1)

@@ -61,12 +41,11 @@

 {

 	int fd[2];

-	if(!s->nopipe){

-		if(pipe(fd) < 0)

-			sysfatal("pipe: %r");

-		s->infd = s->outfd = fd[1];

-		s->srvfd = fd[0];

-	}

+	if(pipe(fd) < 0)

+		sysfatal("pipe: %r");

+	s->infd = s->outfd = fd[1];

+	s->srvfd = fd[0];

+

 	if(name)

 		if(postfd(name, s->srvfd) < 0)

 			sysfatal("postfd %s: %r", name);

@@ -73,30 +52,11 @@

 	if(_forker == nil)

 		sysfatal("no forker");

-	_forker(postproc, s, RFNAMEG);

+	_forker(postproc, s, RFNAMEG|RFFDG|RFNOTEG);

-	/*

-	 * Normally the server is posting as the last thing it does

-	 * before exiting, so the correct thing to do is drop into

-	 * a different fd space and close the 9P server half of the

-	 * pipe before trying to mount the kernel half.  This way,

-	 * if the file server dies, we don't have a ref to the 9P server

-	 * half of the pipe.  Then killing the other procs will drop

-	 * all the refs on the 9P server half, and the mount will fail.

-	 * Otherwise the mount hangs forever.

-	 *

-	 * Libthread in general and acme win in particular make

-	 * it hard to make this fd bookkeeping work out properly,

-	 * so leaveinfdopen is a flag that win sets to opt out of this

-	 * safety net.

-	 */

-	if(!s->leavefdsopen){

-		rfork(RFFDG);

-		rendezvous(0, 0);

-		close(s->infd);

-		if(s->infd != s->outfd)

-			close(s->outfd);

-	}

+	close(s->infd);

+	if(s->infd != s->outfd)

+		close(s->outfd);

 	if(mtpt){

 		if(sharefd(mtpt, desc, s->srvfd) < 0)

@@ -112,10 +72,6 @@

 	Srv *s;

 	s = v;

-	if(!s->leavefdsopen){

-		rfork(RFNOTEG);

-		rendezvous(0, 0);

-		close(s->srvfd);

-	}

+	close(s->srvfd);

 	srv(s);

 }

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

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

@@ -158,7 +158,7 @@

 		usage();

 	if(chatty9p)

-		fprint(2, "ramsrv.nopipe %d srvname %s mtpt %s\n", fs.nopipe, srvname, mtpt);

+		fprint(2, "srvname %s mtpt %s\n", srvname, mtpt);

 	if(addr == nil && srvname == nil && mtpt == nil)

 		sysfatal("must specify -a, -s, or -m option");

 	if(addr)