From 857b02e37f3bd6d5390711521e2dd021beca3a3c Mon Sep 17 00:00:00 2001
From: Damien Miller <djm@mindrot.org>
Date: Fri, 24 Sep 2010 22:02:56 +1000
Subject: [PATCH]    - djm@cvs.openbsd.org 2010/09/20 04:41:47      [ssh.c]    
  install a SIGCHLD handler to reap expiried child process; ok markus@

---
 ChangeLog |  3 +++
 ssh.c     | 21 ++++++++++++++++++++-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index f8596098d..f9e0f6c09 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -12,6 +12,9 @@
    - jmc@cvs.openbsd.org 2010/09/19 21:30:05
      [sftp.1]
      more wacky macro fixing;
+   - djm@cvs.openbsd.org 2010/09/20 04:41:47
+     [ssh.c]
+     install a SIGCHLD handler to reap expiried child process; ok markus@
 
 20100910
  - (dtucker) [openbsd-compat/port-linux.c] Check is_selinux_enabled for exact
diff --git a/ssh.c b/ssh.c
index 70c71bc00..20de28a64 100644
--- a/ssh.c
+++ b/ssh.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssh.c,v 1.351 2010/09/02 16:08:39 markus Exp $ */
+/* $OpenBSD: ssh.c,v 1.352 2010/09/20 04:41:47 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -50,6 +50,7 @@
 #include <sys/ioctl.h>
 #include <sys/param.h>
 #include <sys/socket.h>
+#include <sys/wait.h>
 
 #include <ctype.h>
 #include <errno.h>
@@ -210,6 +211,7 @@ usage(void)
 static int ssh_session(void);
 static int ssh_session2(void);
 static void load_public_identity_files(void);
+static void main_sigchld_handler(int);
 
 /* from muxclient.c */
 void muxclient(const char *);
@@ -877,6 +879,7 @@ main(int ac, char **av)
 	    tilde_expand_filename(options.user_hostfile2, original_real_uid);
 
 	signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
+	signal(SIGCHLD, main_sigchld_handler);
 
 	/* Log into the remote system.  Never returns if the login fails. */
 	ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
@@ -1545,3 +1548,19 @@ load_public_identity_files(void)
 	bzero(pwdir, strlen(pwdir));
 	xfree(pwdir);
 }
+
+static void
+main_sigchld_handler(int sig)
+{
+	int save_errno = errno;
+	pid_t pid;
+	int status;
+
+	while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
+	    (pid < 0 && errno == EINTR))
+		;
+
+	signal(sig, main_sigchld_handler);
+	errno = save_errno;
+}
+