Github issue #11: Use sig_atomic_t within signal handlers.

The variables "discoveryFlags" and "finished" should use the
data type "sig_atomic_t" within pmfind and pmsleep respectively.

src/include/pcp/impl.h

@@ -1489,7 +1489,7 @@ extern void *__pmLock_libpcp;			/* symbol exposure */
 extern int __pmDiscoverServicesWithOptions(const char *,
 					   const char *,
 					   const char *,
-					   const volatile unsigned *,
+					   const volatile sig_atomic_t *,
 					   char ***);
 
 

src/libpcp/src/discovery.c

@@ -161,7 +161,7 @@ int
 __pmDiscoverServicesWithOptions(const char *service,
 				const char *mechanism,
 				const char *optionsString,
-				const volatile unsigned *flags,
+				const volatile sig_atomic_t *flags,
 				char ***urls)
 {
     __pmServiceDiscoveryOptions	options;

src/libpcp/src/internal.h

@@ -257,7 +257,7 @@ typedef struct {
 } __pmServiceInfo;
 
 typedef struct {
-    const volatile unsigned	*flags;		/* Service discovery flags */
+    const volatile sig_atomic_t	*flags;		/* Service discovery flags */
     struct timeval		timeout;	/* Global timeout period */
     volatile int		timedOut;	/* Global timeout occurred */
     int				resolve;	/* Resolve discovered addresses */

src/pmfind/pmfind.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2014 Red Hat.
+ * Copyright (c) 2013-2015 Red Hat.
  * 
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -18,7 +18,7 @@
 static int	quiet;
 static char	*mechanism;
 static char	*options;
-static unsigned	discoveryFlags;
+static volatile sig_atomic_t discoveryFlags;
 
 static int override(int, pmOptions *);
 

src/pmsleep/pmsleep.c

@@ -15,9 +15,10 @@
 
 #include "pmapi.h"
 #include "impl.h"
+#include <signal.h>
 #include <sys/wait.h>
 
-static int finished;
+static volatile sig_atomic_t finished;
 
 static void
 sigterm(int sig)