On 08/15, Eric W. Biederman wrote: > > File handles can be requested to send sigio and sigurg > to processes. By tracking the destination processes > using struct pid instead of pid_t we make the interface > safe from all potential pid wrap around problems. As I can see, this patch adds 2 user visible changes. I am not arguing, but probably it makes sense to document this. Before this patch, fcntl(F_GETOWN) returns the same pid that was given to fcntl(F_SETOWN). Now it returns 0 if there were no process/group with such a pid when F_SETOWN was called. The second change is good (I'd say this is bugfix). It is not possible anymore to send the signal to not yet created processes via fcntl(F_SETOWN, last_pid + a_little), or hit a problem with pid re-use. Oleg.
