epoll workaround for linux java?

[Roman Divacky]

On Mon, Jan 17, 2011 at 01:24:43PM +0100, Alexander Leidinger wrote:
> Quoting Andrew Gallatin <gallatin at cs.duke.edu> (from Sun, 16 Jan 2011  
> 16:31:17 -0500):
> 
> >Hi,
> >
> >I'm trying to run SageTV, which is a commercial, closed source
> >linux media server on -current.  It is a Java based application
> >that uses "native" linux JNI libs for accessing video tuner
> >cards, so unfortunately I must run the Linux JVM, and not
> >a native JVM.
> >
> >I've installed the default linux_base-f10, and the
> >linux-sun-jdk-1.6.0.22.
> >
> >When I start the application, it semi-works, but the
> >clients cannot connect.  Using kdump && linux-ktrace,
> >I think I've narrowed the problem to:
> >
> >
> >  9613 java     CALL  linux_epoll_create
> >  9613 java     RET   linux_epoll_create -1 errno 78 Function not 
> >  implemented
> >  9613 java     CALL  gettimeofday(0x513c9ea0,0)
> >  9613 java     RET   gettimeofday 0
> >  9613 java     CALL  gettimeofday(0x513c9eb4,0)
> >  9613 java     RET   gettimeofday 0
> >  9613 java     CALL  write(0x4,0x513c7cb0,0x78)
> >  9613 java     GIO   fd 4 wrote 120 bytes
> >       "Sun 1/16 12:05:57.648 [MiniUIServer at 14b5f4a] MiniUI  
> >ServerSocket died from:java.io.IOException: Function not impleme\
> >        nted"
> >
> >
> >I've done some googling, and it appears that epoll support
> >was worked on as a SOC project in 2007 by rdivacky.  Eg:
> >http://p4db.freebsd.org/fileLogView.cgi?FSPC=//depot/projects/soc2007/rdivacky/linux_epoll/sys/compat/linux/linux_epoll.c
> >Were there problems with this code?
> 
> AFAIR it's not complete... Roman (CCed)?

the epoll itself basically worked but it didnt work over fork, ie. it was
useless

I dont have time nor motivation to finish that :( noone else
seems to have picked that work up, sorry