On Sat, 27 Oct 2007, Marc Lehmann wrote: > > Please provide some code to illustrate one exact problem you have. > > // assume there is an open epoll set that listens for events on fd 5 > if (fork () = 0) > { > close (5); > // fd 5 is now removed from the epoll set of the parent. > _exit (0); > }
Hmmm ... what? I assume you know that: 1) A file descriptor is a userspace view/handle of a kernel object 2) The kernel object has a use-count for as many file descriptors that have been handed out to userspace 3) A close() decreases the internal counter by one 4) The kernel object gets effectively closed when the internal counter goes to zero 5) A fork() acts as a dup() on the file descriptors by hence bumping up its internal counter 6) Epoll removes the file from the set, when the *kernel* object gets closed (internal use-count goes to zero) With that in mind, how can the code snippet above trigger a removal from the epoll set? - Davide - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/