[PATCH] dnotify documentation update

From: Stephen Rothwell <sfr@canb.auug.org.au>

Fix the dnotify documentation and code example to reflect reality.

Documentation/dnotify.txt

@@ -32,7 +32,8 @@ file descriptor associated with the directory in which the event occurred.
 
 Preferably the application will choose one of the real time signals
 (SIGRTMIN + <n>) so that the notifications may be queued.  This is
-especially important if DN_MULTISHOT is specified.
+especially important if DN_MULTISHOT is specified.  Note that SIGRTMIN
+is often blocked, so it is better to use (at least) SIGRTMIN + 1.
 
 Implementation expectations (features and bugs :-))
 ---------------------------
@@ -78,10 +79,10 @@ Example
 		act.sa_sigaction = handler;
 		sigemptyset(&act.sa_mask);
 		act.sa_flags = SA_SIGINFO;
-		sigaction(SIGRTMIN, &act, NULL);
+		sigaction(SIGRTMIN + 1, &act, NULL);
 		
 		fd = open(".", O_RDONLY);
-		fcntl(fd, F_SETSIG, SIGRTMIN);
+		fcntl(fd, F_SETSIG, SIGRTMIN + 1);
 		fcntl(fd, F_NOTIFY, DN_MODIFY|DN_CREATE|DN_MULTISHOT);
 		/* we will now be notified if any of the files
 		   in "." is modified or new files are created */