On 2012-02-24 09:07:40 (+0200), Kosta Zertsekel <zertsekel@xxxxxxxxx> wrote: > >> > Imagine a driver which only one app can use at a time (perhaps a serial > >> > port). The kernel will take a lock when the user space app open()s the > >> > device node and release it when it close()s. > >> > If the app segfaults in between the open() and close() the lock will > >> > still get released. The kernel always cleans up open files for stopped > >> > processes, regardless of how they stop. During this cleanup the kernel > >> > will close() the device node, and as a result the driver will release > >> > the lock. > > Can you please point to some code in Linux Kernel that does the job? In kernel/exit.c, look at do_exit(). It cleans up a process after it's terminated (for whatever reason). It does a lot of cleanup, but through exit_files() -> put_files_struct() -> close_files() it ends up iterating over all open file descriptors and closing them. What's done for each close depends on what the process had open. Normal files will just be closed, or a TCP socket might be closed, or if a device node was opened the corresponding drivers close() function will be called. Regards, Kristof _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
