3b0d35f94b
use PIDFD_GET_INFO ioctl when available
This way using pidfd_spawnp won't have to rely on procfs, avoiding an unpleasant edge-case where the child is spawned but we can't get the pid. And pidfd.{try_}wait will be able to return the exit status even after a process has been reaped. At least on newer kernels.
Tracking issue: https://github.com/rust-lang/rust/issues/82971
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