1 2277c5d7 2004-03-21 devnull #include <u.h>
 2 2277c5d7 2004-03-21 devnull #include <libc.h>
 3 2277c5d7 2004-03-21 devnull #include <fcall.h>
 4 2277c5d7 2004-03-21 devnull #include <thread.h>
 5 2277c5d7 2004-03-21 devnull #include <9p.h>
 6 2277c5d7 2004-03-21 devnull #include "post.h"
 7 2277c5d7 2004-03-21 devnull 
 8 2277c5d7 2004-03-21 devnull Postcrud*
 9 2277c5d7 2004-03-21 devnull _post1(Srv *s, char *name, char *mtpt, int flag)
10 2277c5d7 2004-03-21 devnull {
11 2277c5d7 2004-03-21 devnull 	Postcrud *p;
12 2277c5d7 2004-03-21 devnull 
13 2277c5d7 2004-03-21 devnull 	p = emalloc9p(sizeof *p);
14 2277c5d7 2004-03-21 devnull 	if(!s->nopipe){
15 2277c5d7 2004-03-21 devnull 		if(pipe(p->fd) < 0)
16 2277c5d7 2004-03-21 devnull 			sysfatal("pipe: %r");
17 2277c5d7 2004-03-21 devnull 		s->infd = s->outfd = p->fd[1];
18 2277c5d7 2004-03-21 devnull 		s->srvfd = p->fd[0];
19 2277c5d7 2004-03-21 devnull 	}
20 2277c5d7 2004-03-21 devnull 	if(name)
21 2277c5d7 2004-03-21 devnull 		if(postfd(name, s->srvfd) < 0)
22 2277c5d7 2004-03-21 devnull 			sysfatal("postfd %s: %r", name);
23 2277c5d7 2004-03-21 devnull 	p->s = s;
24 2277c5d7 2004-03-21 devnull 	p->mtpt = mtpt;
25 2277c5d7 2004-03-21 devnull 	p->flag = flag;
26 2277c5d7 2004-03-21 devnull 	return p;
27 2277c5d7 2004-03-21 devnull }
28 2277c5d7 2004-03-21 devnull 
29 2277c5d7 2004-03-21 devnull void
30 2277c5d7 2004-03-21 devnull _post2(void *v)
31 2277c5d7 2004-03-21 devnull {
32 2277c5d7 2004-03-21 devnull 	Srv *s;
33 2277c5d7 2004-03-21 devnull 
34 2277c5d7 2004-03-21 devnull 	s = v;
35 2277c5d7 2004-03-21 devnull 	if(!s->leavefdsopen){
36 5c8a0421 2004-12-26 devnull 		rfork(RFNOTEG);
37 2277c5d7 2004-03-21 devnull 		rendezvous((ulong)s, 0);
38 2277c5d7 2004-03-21 devnull 		close(s->srvfd);
39 2277c5d7 2004-03-21 devnull 	}
40 2277c5d7 2004-03-21 devnull 	srv(s);
41 2277c5d7 2004-03-21 devnull }
42 2277c5d7 2004-03-21 devnull 
43 2277c5d7 2004-03-21 devnull void
44 2277c5d7 2004-03-21 devnull _post3(Postcrud *p)
45 2277c5d7 2004-03-21 devnull {
46 2277c5d7 2004-03-21 devnull 	/*
47 2277c5d7 2004-03-21 devnull 	 * Normally the server is posting as the last thing it does
48 2277c5d7 2004-03-21 devnull 	 * before exiting, so the correct thing to do is drop into
49 2277c5d7 2004-03-21 devnull 	 * a different fd space and close the 9P server half of the
50 2277c5d7 2004-03-21 devnull 	 * pipe before trying to mount the kernel half.  This way,
51 2277c5d7 2004-03-21 devnull 	 * if the file server dies, we don't have a ref to the 9P server
52 2277c5d7 2004-03-21 devnull 	 * half of the pipe.  Then killing the other procs will drop
53 2277c5d7 2004-03-21 devnull 	 * all the refs on the 9P server half, and the mount will fail.
54 2277c5d7 2004-03-21 devnull 	 * Otherwise the mount hangs forever.
55 2277c5d7 2004-03-21 devnull 	 *
56 2277c5d7 2004-03-21 devnull 	 * Libthread in general and acme win in particular make
57 2277c5d7 2004-03-21 devnull 	 * it hard to make this fd bookkeeping work out properly,
58 2277c5d7 2004-03-21 devnull 	 * so leaveinfdopen is a flag that win sets to opt out of this
59 2277c5d7 2004-03-21 devnull 	 * safety net.
60 2277c5d7 2004-03-21 devnull 	 */
61 2277c5d7 2004-03-21 devnull 	if(!p->s->leavefdsopen){
62 2277c5d7 2004-03-21 devnull 		rfork(RFFDG);
63 2277c5d7 2004-03-21 devnull 		rendezvous((ulong)p->s, 0);
64 2277c5d7 2004-03-21 devnull 		close(p->s->infd);
65 2277c5d7 2004-03-21 devnull 		if(p->s->infd != p->s->outfd)
66 2277c5d7 2004-03-21 devnull 			close(p->s->outfd);
67 2277c5d7 2004-03-21 devnull 	}
68 2277c5d7 2004-03-21 devnull 
69 9bddce0e 2006-06-26 devnull #if 0
70 2277c5d7 2004-03-21 devnull 	if(p->mtpt){
71 2277c5d7 2004-03-21 devnull 		if(amount(p->s->srvfd, p->mtpt, p->flag, "") == -1)
72 2277c5d7 2004-03-21 devnull 			sysfatal("mount %s: %r", p->mtpt);
73 2277c5d7 2004-03-21 devnull 	}else
74 9bddce0e 2006-06-26 devnull #endif
75 2277c5d7 2004-03-21 devnull 		close(p->s->srvfd);
76 2277c5d7 2004-03-21 devnull 	free(p);
77 2277c5d7 2004-03-21 devnull }