From: Bodo Stroesser <bstroesser@fujitsu-siemens.com>

If a SIGWINCH comes in, while winch_thread() isn't waiting
in wait(), winch_thread could miss signals.
It isn't very probable, that anyone will see this causing
trouble, as it would need a very special timing, that a
missed SIGWINCH results in a wrong window size.

So, this is a minor problem. But why not fix, as it can
be done so easy?

Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
---


diff -puN arch/um/drivers/chan_user.c~fix-winch_thread arch/um/drivers/chan_user.c
--- linux-2.6.12-rc4/arch/um/drivers/chan_user.c~fix-winch_thread	2005-05-18 20:53:32.000000000 +0200
+++ linux-2.6.12-rc4-root/arch/um/drivers/chan_user.c	2005-05-18 21:16:55.000000000 +0200
@@ -98,13 +98,14 @@ static int winch_thread(void *arg)
 
 	signal(SIGWINCH, winch_handler);
 	sigfillset(&sigs);
-	sigdelset(&sigs, SIGWINCH);
-	/* Block anything else than SIGWINCH. */
+	/* Block all signals possible. */
 	if(sigprocmask(SIG_SETMASK, &sigs, NULL) < 0){
 		printk("winch_thread : sigprocmask failed, errno = %d\n", 
 		       errno);
 		exit(1);
 	}
+	/* In sigsuspend(), block anything else than SIGWINCH. */
+	sigdelset(&sigs, SIGWINCH);
 
 	if(setsid() < 0){
 		printk("winch_thread : setsid failed, errno = %d\n", errno);
@@ -129,7 +130,7 @@ static int winch_thread(void *arg)
 	while(1){
 		/* This will be interrupted by SIGWINCH only, since other signals
 		 * are blocked.*/
-		pause();
+		sigsuspend(&sigs);
 
 		count = os_write_file(pipe_fd, &c, sizeof(c));
 		if(count != sizeof(c))
_