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Martin Vogel
e775c7f511
macOS answers ESRCH to setpgid and getpgid for our own unreaped child from
the moment it starts to exit, before waitid can report it. a5c7ae97 accepted
a child that had already exited, probed with waitid(WNOHANG|WNOWAIT); in the
window before the child is reapable that probe said "not exited", and the
spawn was reported as SPAWN_FAILED errno 3. macos-15-intel CI kept hitting it
in a different Git-backed fixture on each run; with the new diagnostics it
named itself: `git config --local core.protectNTFS false`, outcome=5 errno=3.
A child of ours that setpgid/getpgid cannot find is not running: it has
exited or is exiting. The parent now waits until it is reapable (WNOWAIT
leaves it for the supervision, which reaps it with its real exit status);
the wait ends with the child's exit. EACCES/EPERM keep the group check.
A test seam makes the parent observe the exiting state (ESRCH, not yet
reapable): subprocess_run_child_exiting_at_group_check is SPAWN_FAILED
without this change and exit status 3 with it.
Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>