X-Git-Url: http://git.annexia.org/?a=blobdiff_plain;f=daemon%2Fzero.c;h=4d06505260379d8adcecb6d31f2319c5169e0ef7;hb=214babb060d9e85e72bad4633310a9b4a5fcb9dd;hp=9c803d8cb3f4e8806e58c0b04c290939a50aa085;hpb=a7b73d4a1e09f12b2002083618056f0c823c1dcf;p=libguestfs.git

diff --git a/daemon/zero.c b/daemon/zero.c
index 9c803d8..4d06505 100644
--- a/daemon/zero.c
+++ b/daemon/zero.c
@@ -28,13 +28,11 @@
 #include "actions.h"
 
 int
-do_zero (char *device)
+do_zero (const char *device)
 {
   int fd, i;
   char buf[4096];
 
-  IS_DEVICE (device, -1);
-
   fd = open (device, O_WRONLY);
   if (fd == -1) {
     reply_with_perror ("%s", device);
@@ -44,9 +42,16 @@ do_zero (char *device)
   memset (buf, 0, sizeof buf);
 
   for (i = 0; i < 32; ++i)
-    (void) write (fd, buf, sizeof buf);
-
-  close (fd);
+    if (write (fd, buf, sizeof buf) != sizeof buf) {
+      reply_with_perror ("write: %s", device);
+      close (fd);
+      return -1;
+    }
+
+  if (close (fd) == -1) {
+    reply_with_perror ("close: %s", device);
+    return -1;
+  }
 
   return 0;
 }