[PATCH] Make task directories in /proc pollable

This has been a requested feature for a long time [1][2]. /proc/ and /proc//task/ will show POLLIN | POLLRDNORM when the is dead and POLLIN | POLLRDNORM | POLLERR when is dead and reaped. The ability to tell whether the task exists given an fd isn't new -- readdir can do it. The ability to

[PATCH] Make task directories in /proc pollable

This has been a requested feature for a long time [1][2]. /proc/pid and /proc/tgid/task/pid will show POLLIN | POLLRDNORM when the pid is dead and POLLIN | POLLRDNORM | POLLERR when pid is dead and reaped. The ability to tell whether the task exists given an fd isn't new -- readdir can do it.