lib9p: added functions for devshr
This commit is contained in:
parent
c08f86254e
commit
abe6ead0ff
4 changed files with 85 additions and 0 deletions
|
@ -216,9 +216,12 @@ struct Srv {
|
|||
void srv(Srv*);
|
||||
void postmountsrv(Srv*, char*, char*, int);
|
||||
void _postmountsrv(Srv*, char*, char*, int);
|
||||
void postsharesrv(Srv*, char*, char*, char*, char*);
|
||||
void _postsharesrv(Srv*, char*, char*, char*, char*);
|
||||
void listensrv(Srv*, char*);
|
||||
void _listensrv(Srv*, char*);
|
||||
int postfd(char*, int);
|
||||
int sharefd(char*, char*, char*, int);
|
||||
int chatty9p;
|
||||
void respond(Req*, char*);
|
||||
void responderror(Req*);
|
||||
|
|
|
@ -56,6 +56,56 @@ _postmountsrv(Srv *s, char *name, char *mtpt, int flag)
|
|||
close(s->srvfd);
|
||||
}
|
||||
|
||||
void
|
||||
_postsharesrv(Srv *s, char *name, char *mtpt, char *desc, char *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(sharefd(mtpt, desc, flag, s->srvfd) < 0)
|
||||
sysfatal("sharefd %s: %r", mtpt);
|
||||
}else
|
||||
close(s->srvfd);
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
postproc(void *v)
|
||||
{
|
||||
|
|
|
@ -32,3 +32,9 @@ postmountsrv(Srv *s, char *name, char *mtpt, int flag)
|
|||
_postmountsrv(s, name, mtpt, flag);
|
||||
}
|
||||
|
||||
void
|
||||
postsharesrv(Srv *s, char *name, char *mtpt, char *desc, char *flag)
|
||||
{
|
||||
_forker = rforker;
|
||||
_postsharesrv(s, name, mtpt, desc, flag);
|
||||
}
|
||||
|
|
|
@ -851,3 +851,29 @@ postfd(char *name, int pfd)
|
|||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
sharefd(char *name, char *desc, char *flags, int pfd)
|
||||
{
|
||||
int fd;
|
||||
char buf[80];
|
||||
|
||||
snprint(buf, sizeof buf, "#σc/%s", name);
|
||||
if(chatty9p)
|
||||
fprint(2, "sharefd %s\n", buf);
|
||||
fd = create(buf, OWRITE, 0600);
|
||||
if(fd < 0){
|
||||
if(chatty9p)
|
||||
fprint(2, "create fails: %r\n");
|
||||
return -1;
|
||||
}
|
||||
if(fprint(fd, "%s %d %s\n", flags, pfd, desc) < 0){
|
||||
if(chatty9p)
|
||||
fprint(2, "write fails: %r\n");
|
||||
close(fd);
|
||||
return -1;
|
||||
}
|
||||
close(fd);
|
||||
if(chatty9p)
|
||||
fprint(2, "sharefd successful\n");
|
||||
return 0;
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue