um: Preserve errno within signal handler

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We rely on errno to determine whether a syscall has failed, so we
need to ensure that accessing errno is async-signal-safe. Currently,
we preserve the errno in sig_handler_common(), but it doesn't cover
every possible case. Let's do it in hard_handler() instead, which
is the signal handler we actually register.

Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20260106001228.1531146-2-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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Tiwei Bie 2026-01-06 08:12:27 +08:00 • committed by Johannes Berg

parent 0f61b1860c

commit f68b2d5a90

1 changed files with 3 additions and 3 deletions

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arch/um/os-Linux/signal.c

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