diff --git a/configure.ac b/configure.ac
index 5ee5a04..9c7c47f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -54,6 +54,9 @@ AC_PROG_CC
 AC_PROG_INSTALL
 AC_PROG_MAKE_SET
 
+# Checks for operating system services and capabilities.
+AC_SYS_LARGEFILE
+
 # Checks for header files.
 AC_HEADER_DIRENT
 AC_CHECK_HEADERS([fcntl.h malloc.h stdlib.h string.h unistd.h])
diff --git a/lib/sysfs_attr.c b/lib/sysfs_attr.c
index ccf829f..8d2d0fc 100644
--- a/lib/sysfs_attr.c
+++ b/lib/sysfs_attr.c
@@ -179,6 +179,7 @@ int sysfs_read_attribute(struct sysfs_attribute *sysattr)
 			return 0;
 		}
 		free(sysattr->value);
+		sysattr->value = NULL;
 	}
 	sysattr->len = length;
 	close(fd);
@@ -255,7 +256,7 @@ int sysfs_write_attribute(struct sysfs_attribute *sysattr,
 		 * restore the old value if one available
 		 */
 		if (sysattr->method & SYSFS_METHOD_SHOW) {
-			length = write(fd, sysattr->value, sysattr->len);
+			(void)write(fd, sysattr->value, sysattr->len);
 			close(fd);
 			return -1;
 		}
@@ -629,7 +630,7 @@ struct dlist *get_dev_attributes_list(void *dev)
 				else
 					add_attribute(dev, file_path);
 			} else
-				attr = add_attribute(dev, file_path);
+				add_attribute(dev, file_path);
 		}
 	}
 	closedir(dir);
diff --git a/test/dlist_test.c b/test/dlist_test.c
index e7f3d1e..a5365b6 100644
--- a/test/dlist_test.c
+++ b/test/dlist_test.c
@@ -68,7 +68,8 @@ int main (void)
   Dlist *list;
   Simple *s1,*s2,*s3,*stemp;
   Complex *c1,*c2,*c3, *c4, *ctemp, *cfound;
-  while(1)
+  int count = 10;
+  while(count--)
     {
 	s1=simple_maker(1,"one");
 	s2=simple_maker(2,"two");