$NetBSD: patch-ad,v 1.4 2025/04/29 09:10:51 tnn Exp $

--- lib/sighandle.c.orig	2003-10-05 03:49:29.000000000 +0000
+++ lib/sighandle.c
@@ -56,7 +56,7 @@ char *malloc();
 
 /* Define linked list of signal handlers structure */
 struct SIG_hlist {
-	RETSIGTYPE		(*handler)();
+	RETSIGTYPE		(*handler)(int);
 	struct SIG_hlist	*next;
 };
 
@@ -204,8 +204,10 @@ static RETSIGTYPE SIG_handle (int sig)
 	this = SIG_handlers[sig];
 	while (this != (struct SIG_hlist *) NULL)
 	{
-		(*this->handler)(sig);
+		/* handler may free this (and thus clobber this->next) */
+		struct SIG_hlist *current = this;
 		this = this->next;
+		(*current->handler)(sig);
 	}
 	SIG_endCrSect();
 
@@ -220,7 +222,7 @@ static RETSIGTYPE SIG_handle (int sig)
  * restoration later.
  */
 
-int SIG_register(int sig, RETSIGTYPE (*fn)())
+int SIG_register(int sig, RETSIGTYPE (*fn)(int))
 {
 	int			val;
 	struct SIG_hlist	*this;