Handle SIGPIPE and SIGCHLD.

ndhc/ifchd.c

@@ -285,7 +285,6 @@ static void setup_signals_ifch(void)
 {
     sigset_t mask;
     sigemptyset(&mask);
-    // XXX: Do we need to change SIGPIPE?
     sigaddset(&mask, SIGPIPE);
     sigaddset(&mask, SIGUSR1);
     sigaddset(&mask, SIGUSR2);
@@ -323,7 +322,8 @@ static void signal_dispatch(void)
             exit(EXIT_SUCCESS);
             break;
         case SIGPIPE:
-            // XXX: Handle SIGPIPE.
+            log_line("ndhc-ifch: IPC pipe closed.  Exiting.");
+            exit(EXIT_SUCCESS);
             break;
         default:
             break;

ndhc/ndhc.c

@@ -145,9 +145,18 @@ static void signal_dispatch(void)
         case SIGUSR2:
             force_release_action(&cs);
             break;
+        case SIGPIPE:
+            log_line("ndhc-master: IPC pipe closed.  Exiting.");
+            exit(EXIT_SUCCESS);
+            break;
+        case SIGCHLD:
+            log_line("ndhc-master: Subprocess terminated unexpectedly.  Exiting.");
+            exit(EXIT_FAILURE);
+            break;
         case SIGTERM:
             log_line("Received SIGTERM.  Exiting gracefully.");
             exit(EXIT_SUCCESS);
+            break;
         default:
             break;
     }

ndhc/sys.c

@@ -47,6 +47,8 @@ void setup_signals_ndhc(struct client_state_t *cs)
     sigemptyset(&mask);
     sigaddset(&mask, SIGUSR1);
     sigaddset(&mask, SIGUSR2);
+    sigaddset(&mask, SIGCHLD);
+    sigaddset(&mask, SIGPIPE);
     sigaddset(&mask, SIGTERM);
     if (sigprocmask(SIG_BLOCK, &mask, NULL) < 0)
         suicide("sigprocmask failed");