lib9p: Remove postmountsrv (#505)

src/lib9p/_post.c

@@ -1,77 +0,0 @@
-#include <u.h>
-#include <libc.h>
-#include <fcall.h>
-#include <thread.h>
-#include <9p.h>
-#include "post.h"
-
-Postcrud*
-_post1(Srv *s, char *name, char *mtpt, int flag)
-{
-	Postcrud *p;
-
-	p = emalloc9p(sizeof *p);
-	if(!s->nopipe){
-		if(pipe(p->fd) < 0)
-			sysfatal("pipe: %r");
-		s->infd = s->outfd = p->fd[1];
-		s->srvfd = p->fd[0];
-	}
-	if(name)
-		if(postfd(name, s->srvfd) < 0)
-			sysfatal("postfd %s: %r", name);
-	p->s = s;
-	p->mtpt = mtpt;
-	p->flag = flag;
-	return p;
-}
-
-void
-_post2(void *v)
-{
-	Srv *s;
-
-	s = v;
-	if(!s->leavefdsopen){
-		rfork(RFNOTEG);
-		rendezvous((ulong)s, 0);
-		close(s->srvfd);
-	}
-	srv(s);
-}
-
-void
-_post3(Postcrud *p)
-{
-	/*
-	 * 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(!p->s->leavefdsopen){
-		rfork(RFFDG);
-		rendezvous((ulong)p->s, 0);
-		close(p->s->infd);
-		if(p->s->infd != p->s->outfd)
-			close(p->s->outfd);
-	}
-
-#if 0
-	if(p->mtpt){
-		if(amount(p->s->srvfd, p->mtpt, p->flag, "") == -1)
-			sysfatal("mount %s: %r", p->mtpt);
-	}else
-#endif
-		close(p->s->srvfd);
-	free(p);
-}

src/lib9p/post.c

@@ -1,23 +0,0 @@
-#include <u.h>
-#include <libc.h>
-#include <fcall.h>
-#include <thread.h>
-#include <9p.h>
-#include "post.h"
-
-void
-postmountsrv(Srv *s, char *name, char *mtpt, int flag)
-{
-	Postcrud *p;
-
-	p = _post1(s, name, mtpt, flag);
-	switch(rfork(RFPROC|RFNOTEG|RFNAMEG|RFMEM)){
-	case -1:
-		sysfatal("rfork: %r");
-	case 0:
-		_post2(s);
-		exits(nil);
-	default:
-		_post3(p);
-	}
-}

src/lib9p/post.h

@@ -1,13 +0,0 @@
-typedef struct Postcrud Postcrud;
-struct Postcrud
-{
-	int fd[2];
-	Srv *s;
-	char *name;
-	char *mtpt;
-	int flag;
-};
-
-Postcrud *_post1(Srv*, char*, char*, int);
-void _post2(void*);
-void _post3(Postcrud*);