Hi all, I implemented a module that sends signals to user space using kobject_uevent() when some conditions happen. That step is working. When the signal is sent, a sysfs attribute is also changed (switch from 0 to 1 or vice-versa). This means that the corresponding file under /sys/ has its contents modified as well (using "_name"_show(struct subsystem *subsys, char *page) function) . The user space when receives the signal (sent by kobject_uevent()) it tries to read the file under /sys (that was changed to 1 when the signal was sent), but the value is always 0. IMHO there is a sync problem, because when user space gets the signal and it reads the file under /sys, the value set to 1 (notify moment) could be changed back to 0 (read moment) later. So is there any way to send a signal and guarantee that the attribute will be read by user space before being changed by subsequent actions? Is sysfs_notify() a possible solution for that? BR, Mauricio Lin. _______________________________________________________ Novidade no Yahoo! Mail: receba alertas de novas mensagens no seu celular. Registre seu aparelho agora! http://br.mobile.yahoo.com/mailalertas/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
