122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
#include <u.h>
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#include <lib9.h>
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#include <9P2000.h>
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#include <thread.h>
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#include <9p.h>
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#include <auth.h>
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static void postproc(void*);
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void
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_postmountsrv(Srv *s, char *name, char *mtpt, int flag)
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{
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int fd[2];
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if(!s->nopipe){
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if(pipe(fd) < 0)
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sysfatal("pipe: %r");
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s->infd = s->outfd = fd[1];
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s->srvfd = fd[0];
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}
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if(name)
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if(postfd(name, s->srvfd) < 0)
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sysfatal("postfd %s: %r", name);
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if(_forker == nil)
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sysfatal("no forker");
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_forker(postproc, s, RFNAMEG);
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/*
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* Normally the server is posting as the last thing it does
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* before exiting, so the correct thing to do is drop into
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* a different fd space and close the 9P server half of the
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* pipe before trying to mount the kernel half. This way,
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* if the file server dies, we don't have a ref to the 9P server
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* half of the pipe. Then killing the other procs will drop
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* all the refs on the 9P server half, and the mount will fail.
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* Otherwise the mount hangs forever.
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*
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* Libthread in general and acme win in particular make
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* it hard to make this fd bookkeeping work out properly,
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* so leaveinfdopen is a flag that win sets to opt out of this
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* safety net.
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*/
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if(!s->leavefdsopen){
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rfork(RFFDG);
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rendezvous(0, 0);
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close(s->infd);
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if(s->infd != s->outfd)
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close(s->outfd);
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}
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if(mtpt){
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if(amount(s->srvfd, mtpt, flag, "") == -1)
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sysfatal("mount %s: %r", mtpt);
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}else
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close(s->srvfd);
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}
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void
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_postsharesrv(Srv *s, char *name, char *mtpt, char *desc)
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{
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int fd[2];
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if(!s->nopipe){
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if(pipe(fd) < 0)
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sysfatal("pipe: %r");
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s->infd = s->outfd = fd[1];
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s->srvfd = fd[0];
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}
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if(name)
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if(postfd(name, s->srvfd) < 0)
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sysfatal("postfd %s: %r", name);
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if(_forker == nil)
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sysfatal("no forker");
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_forker(postproc, s, RFNAMEG);
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/*
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* Normally the server is posting as the last thing it does
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* before exiting, so the correct thing to do is drop into
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* a different fd space and close the 9P server half of the
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* pipe before trying to mount the kernel half. This way,
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* if the file server dies, we don't have a ref to the 9P server
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* half of the pipe. Then killing the other procs will drop
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* all the refs on the 9P server half, and the mount will fail.
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* Otherwise the mount hangs forever.
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*
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* Libthread in general and acme win in particular make
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* it hard to make this fd bookkeeping work out properly,
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* so leaveinfdopen is a flag that win sets to opt out of this
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* safety net.
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*/
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if(!s->leavefdsopen){
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rfork(RFFDG);
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rendezvous(0, 0);
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close(s->infd);
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if(s->infd != s->outfd)
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close(s->outfd);
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}
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if(mtpt){
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if(sharefd(mtpt, desc, s->srvfd) < 0)
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sysfatal("sharefd %s: %r", mtpt);
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}else
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close(s->srvfd);
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}
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static void
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postproc(void *v)
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{
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Srv *s;
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s = v;
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if(!s->leavefdsopen){
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rfork(RFNOTEG);
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rendezvous(0, 0);
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close(s->srvfd);
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}
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srv(s);
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}
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