1 files changed, 9 insertions, 3 deletions
diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index b089432..0710ac7 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -3413,12 +3413,18 @@ lin_thread_get_thread_signals (sigset_t *set)
   sigemptyset (set);
 
   restart = get_signo ("__pthread_sig_restart");
+  cancel = get_signo ("__pthread_sig_cancel");
+
+  /* LinuxThreads normally uses the first two RT signals, but in some legacy
+     cases may use SIGUSR1/SIGUSR2.  NPTL always uses RT signals, but does
+     not provide any way for the debugger to query the signal numbers -
+     fortunately they don't change!  */
+
   if (restart == 0)
-    return;
+    restart = __SIGRTMIN;
 
-  cancel = get_signo ("__pthread_sig_cancel");
   if (cancel == 0)
-    return;
+    cancel = __SIGRTMIN + 1;
 
   sigaddset (set, restart);
   sigaddset (set, cancel);