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- #include <u.h>
- #include <libc.h>
- #include <fcall.h>
- #include <thread.h>
- #include <9p.h>
- #include <auth.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(p->mtpt){
- if(amount(p->s->srvfd, p->mtpt, p->flag, "") == -1)
- sysfatal("mount %s: %r", p->mtpt);
- }else
- close(p->s->srvfd);
- free(p);
- }
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