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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- #include <u.h>
- #include <libc.h>
- #include <fcall.h>
- #include <thread.h>
- #include <9p.h>
- #include <auth.h>
- static void postproc(void*);
- void
- _postmountsrv(Srv *s, char *name, char *mtpt, int flag)
- {
- int fd[2];
- if(!s->nopipe){
- 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);
- if(_forker == nil)
- sysfatal("no forker");
- _forker(postproc, s, RFNAMEG);
- /*
- * 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);
- }
- if(mtpt){
- if(amount(s->srvfd, mtpt, flag, "") == -1)
- sysfatal("mount %s: %r", mtpt);
- }else
- close(s->srvfd);
- }
- static void
- postproc(void *v)
- {
- Srv *s;
- s = v;
- if(!s->leavefdsopen){
- rfork(RFNOTEG);
- rendezvous(0, 0);
- close(s->srvfd);
- }
- srv(s);
- }
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