fix checking of syscall rvals

1 files changed, 17 insertions, 6 deletions

diff --git a/src/main.c b/src/main.c
index 48a1a49..1718ca2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1080,7 +1080,7 @@ shutdown_task (void *cls)
   }
   if (0 < cancel_button.cancelbuttonfd)
   {
-    close (cancel_button.cancelbuttonfd);
+    GNUNET_break (0 == close (cancel_button.cancelbuttonfd));
     cancel_button.cancelbuttonfd = open ("/sys/class/gpio/unexport",
                                          O_WRONLY);
     if (0 > cancel_button.cancelbuttonfd)
@@ -1088,10 +1088,19 @@ shutdown_task (void *cls)
       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                   "Unable to open /gpio/unexport for cancel button\n");
     }
-    (void) ! write (cancel_button.cancelbuttonfd,
-                    "23",
-                    2);
-    close (cancel_button.cancelbuttonfd);
+    else
+    {
+      if (2 != write (cancel_button.cancelbuttonfd,
+                      "23",
+                      2))
+      {
+        GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
+                                  "write",
+                                  "/sys/class/gpio/unexport");
+
+      }
+      GNUNET_break (0 == close (cancel_button.cancelbuttonfd));
+    }
   }
   /* free the allocated productes read from config file */
   if (NULL != products)
@@ -1845,7 +1854,9 @@ cancel_button_pressed (void *cls)
     return;
   }
 
-  lseek (cancel_button.cancelbuttonfd, 0, SEEK_SET);
+  GNUNET_break (0 == lseek (cancel_button.cancelbuttonfd,
+                            0,
+                            SEEK_SET));
   /* This point should only be reached  when a order is pending, because
    * the scheduler read file gets added in the function "launch_payment".
    * But anyway safe check, else do nothing */