Jon Masters <jonmasters@xxxxxxxxx> writes: > On Wed, 29 Dec 2004 03:50:49 +0100, Maurizio Monge > <maurizio.monge@xxxxxxxxx> wrote: > >> It could be useful in the following case: suppose a server running as >> root opens /dev/mem and would like to allow a client to access a small >> portion of /dev/mem. It cannot pass to the client the whole file >> descriptor to /dev/mem! > > Why not have the second process told which region to open and go from > there? It's not actually that common for something to want to do what > you're describing anyway :-). > > If you want to implement this, what do you want to pass across to the > second process anyway - remember that a random pointer is useless > outside of the process within which it lives and you already decided > passing fd's was a bad idea. So what's left now? System V shared memory might be sufficient. -- Ed L Cashin <ecashin@xxxxxxxxxx> -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
