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mysqld: ignore SIGHUP sent by the kernel

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SIGHUP causes debug info in the error log and reload of
logs/privileges/tables/etc. The server should only do it when
a user intentionally sends SUGHUP, not when a parent terminal gets
disconnected or something.

In particular, not ignoring kernel SIGHUP causes FLUSH PRIVILEGES
at some random point during non-systemd Debian upgrades (Debian
restarts mysqld, debian-start script runs mysql_upgrade in the background,
postinit script ends and kernel sends SIGHUP to all background processes
it has started). And during mysql_upgrade privilege tables aren't
necessarily ready to be reloaded.
This commit is contained in:
Sergei Golubchik
2018-12-07 13:05:34 +01:00
parent 97dbb3562b
commit 07e9b13898
6 changed files with 23 additions and 7 deletions
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cmake/os/WindowsCache.cmake
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@@ -153,6 +153,7 @@ SET(HAVE_SIGSET CACHE INTERNAL "")
SET(HAVE_SIGTERM 1 CACHE INTERNAL "")
SET(HAVE_SIGTHREADMASK CACHE INTERNAL "")
SET(HAVE_SIGWAIT CACHE INTERNAL "")
SET(HAVE_SIGWAITINFO CACHE INTERNAL "")
SET(HAVE_SIZEOF_CHARP TRUE CACHE INTERNAL "")
SET(SIZEOF_CHARP ${CMAKE_SIZEOF_VOID_P} CACHE INTERNAL "")
SET(HAVE_SIZEOF_IN6_ADDR TRUE CACHE INTERNAL "")