From 10dcd5d0da23ca2ceaba373cc7c366f80587516f Mon Sep 17 00:00:00 2001
From: Chris Green <greenc@fnal.gov>
Date: Mon, 27 Nov 2023 11:42:56 -0600
Subject: [PATCH] Reenable RT signals after custom signal handler is installed

---
 art/Utilities/UnixSignalHandlers.cc | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/art/Utilities/UnixSignalHandlers.cc b/art/Utilities/UnixSignalHandlers.cc
index e9fd69ff9..4ffba808e 100644
--- a/art/Utilities/UnixSignalHandlers.cc
+++ b/art/Utilities/UnixSignalHandlers.cc
@@ -76,7 +76,7 @@ namespace art {
 
 #ifdef __linux__
     void
-    disableRTSigs()
+    tweakRTSigs_(int how)
     {
       sigset_t myset;
       abort_on_error(sigemptyset(&myset));
@@ -87,7 +87,7 @@ namespace art {
         abort_on_error(sigaddset(&myset, num));
         abort_on_error(sigaction(num, &tmpact, nullptr));
       }
-      abort_on_error(pthread_sigmask(SIG_BLOCK, &myset, 0));
+      abort_on_error(pthread_sigmask(how, &myset, 0));
     }
 #endif // __linux__
 
@@ -105,9 +105,12 @@ namespace art {
       sigset_t oldset;
       disableAllSigs(&oldset);
 #ifdef __linux__
-      disableRTSigs();
+      tweakRTSigs_(SIG_BLOCK);
 #endif // __linux__
       installSig(signum, func);
+#ifdef __linux__
+      tweakRTSigs_(SIG_UNBLOCK);
+#endif // __linux__
       reenableSigs(&oldset);
     }