Fix new poll() code for helper pipe. Removed CPU-spin.

CHANGELOG

@@ -1,3 +1,9 @@
+version 2.75
+            Fix reversion on 2.74 which caused 100% CPU use when a 
+	    dhcp-script is configured. Thanks to Adrian Davey for
+	    reporting the bug and testing the fix.
+
+	
 version 2.74
             Fix reversion in 2.73 where --conf-file would attempt to
 	    read the default file, rather than no file.

debian/changelog

@@ -1,3 +1,9 @@
+dnsmasq (2.75-1) unstable; urgency=low
+
+   * New upstream. (closes: #794095)
+	
+ -- Simon Kelley <simon@thekelleys.org.uk>  Thur, 30 Jul 2015 20:58:31 +0000
+
 dnsmasq (2.74-1) unstable; urgency=low
 
    * New upstream. (LP: #1468611)

src/dnsmasq.c

@@ -1025,7 +1025,7 @@ int main (int argc, char **argv)
 #endif
 
 #  ifdef HAVE_SCRIPT
-      if (daemon->helperfd != -1 && poll_check(daemon->helperfd, POLLIN))
+      if (daemon->helperfd != -1 && poll_check(daemon->helperfd, POLLOUT))
 	helper_write();
 #  endif
 #endif