- (stevesk) add mysignal() wrapper and use it for the protocol 2

SIGCHLD handler.

ChangeLog

@@ -29,6 +29,8 @@
  - (djm) Update several bits for new optional reverse lookup stuff. I 
    think I got them all.
  - (djm) Makefile.in fixes
+ - (stevesk) add mysignal() wrapper and use it for the protocol 2
+   SIGCHLD handler.
 
 20010103
  - (bal) Cygwin clean up by Corinna Vinschen <vinschen@redhat.com>

misc.c

@@ -27,6 +27,7 @@
 #include "includes.h"
 RCSID("$OpenBSD: util.c,v 1.6 2000/10/27 07:32:19 markus Exp $");
 
+#include "misc.h"
 #include "ssh.h"
 #include "log.h"
 
@@ -95,3 +96,25 @@ strdelim(char **s)
 
 	return (old);
 }
+
+mysig_t
+mysignal(int sig, mysig_t act)
+{
+#ifdef HAVE_SIGACTION
+	struct sigaction sa, osa;
+
+	if (sigaction(sig, 0, &osa) == -1)
+		return (mysig_t) -1;
+	if (osa.sa_handler != act) {
+		memset(&sa, 0, sizeof sa);
+		sigemptyset(&sa.sa_mask);
+		sa.sa_flags = 0;
+		sa.sa_handler = act;
+		if (sigaction(sig, &sa, 0) == -1)
+			return (mysig_t) -1;
+	}
+	return (osa.sa_handler);
+#else
+	return (signal(sig, act));
+#endif
+}

misc.h

@@ -19,3 +19,7 @@ char	*strdelim(char **s);
 
 /* set filedescriptor to non-blocking */
 void	set_nonblock(int fd);
+
+/* wrapper for signal interface */
+typedef void (*mysig_t)(int);
+mysig_t mysignal(int sig, mysig_t act);

serverloop.c

@@ -110,7 +110,7 @@ sigchld_handler2(int sig)
 	int save_errno = errno;
 	debug("Received SIGCHLD.");
 	child_terminated = 1;
-	signal(SIGCHLD, sigchld_handler2);
+	mysignal(SIGCHLD, sigchld_handler2);
 	errno = save_errno;
 }
 
@@ -639,7 +639,7 @@ server_loop2(void)
 
 	debug("Entering interactive session for SSH2.");
 
-	signal(SIGCHLD, sigchld_handler2);
+	mysignal(SIGCHLD, sigchld_handler2);
 	signal(SIGPIPE, SIG_IGN);
 	child_terminated = 0;
 	connection_in = packet_get_connection_in();