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Maxim Konovalov
f9f4abe8c9
fdcopy() skips plain kqueues and close-on-fork descriptors when it
copies the table into the child. Check that dup(2) in the child still
returns the lowest unused descriptor, both when the skipped descriptor
is the lowest free slot and when it sits above an existing hole.
Test cases:
kqueue_no_hole a plain kqueue is the lowest descriptor; the
child's dup() reuses its slot
kqueue_two two adjacent plain kqueues; the child's dup()
returns the lower one
kqueue_above_hole a plain kqueue sits above a closed descriptor;
the child's dup() returns the hole
kqueue_cponfork a KQUEUE_CPONFORK kqueue is copied; the child's
dup() returns the next slot
clofork_no_hole an O_CLOFORK descriptor is the lowest one; the
child's dup() reuses its slot
clofork_above_hole an O_CLOFORK descriptor sits above a closed
descriptor; the child's dup() returns the hole
Without 99a58803f9, kqueue_no_hole, kqueue_two and
clofork_above_hole fail.
PR: 300234
Reviewed by: kib
MFC after: 1 week
MFC with: 99a58803f9
Co-authored-by: Claude Code Opus 5.5
Differential Revision: https://reviews.freebsd.org/D61124