Centralize logic for restoring errno in signal handlers.

Presently, we rely on each individual signal handler to save the
initial value of errno and then restore it before returning if
needed.  This is easily forgotten and, if missed, often goes
undetected for a long time.

In commit 3b00fdba9f, we introduced a wrapper signal handler
function that checks whether MyProcPid matches getpid().  This
commit moves the aforementioned errno restoration code from the
individual signal handlers to the new wrapper handler so that we no
longer need to worry about missing it.

Reviewed-by: Andres Freund, Noah Misch
Discussion: https://postgr.es/m/20231121212008.GA3742740%40nathanxps13

1 files changed, 0 insertions, 4 deletions

diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 2c3099f76f1..c9ce380f0f1 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -1410,12 +1410,8 @@ AutoVacWorkerFailed(void)
 static void
 avl_sigusr2_handler(SIGNAL_ARGS)
 {
-	int			save_errno = errno;
-
 	got_SIGUSR2 = true;
 	SetLatch(MyLatch);
-
-	errno = save_errno;
 }