Rethinking race-free process signaling
Rethinking race-free process signaling
Posted Apr 5, 2019 18:32 UTC (Fri) by pbonzini (subscriber, #60935)In reply to: Rethinking race-free process signaling by jgg
Parent article: Rethinking race-free process signaling
It can double fork and when the parent exits the child is reparented to init (or to the subreaper if it exists). init is very quick at reaping zombies, and that can cause PID reuse.
Posted Apr 19, 2019 18:12 UTC (Fri)
by mixi (guest, #131542)
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It could exit in the grandchild, which would cause the grandchild to be reaped by init, but won't have any effect on the child's PID.
Rethinking race-free process signaling
It can't make the kernel reuse the original child's PID, as it will hang around as zombie process until the creator executes any of the wait* functions.