daemon: Move useful is_zero function to header file.

[libguestfs.git] / daemon / daemon.h

diff --git a/daemon/daemon.h b/daemon/daemon.h
index 79f41ae..b4f99a8 100644 (file)
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -1,5 +1,5 @@
 /* libguestfs - the guestfsd daemon
- * Copyright (C) 2009 Red Hat Inc.
+ * Copyright (C) 2009-2011 Red Hat Inc.
  *
  * 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
@@ -36,7 +36,7 @@ extern int verbose;
 extern int autosync_umount;
 
 extern const char *sysroot;
-extern int sysroot_len;
+extern size_t sysroot_len;
 
 extern char *sysroot_path (const char *path);
 
@@ -128,6 +128,9 @@ extern struct optgroup optgroups[];
 /* Use this as a replacement for sync(2). */
 extern int sync_disks (void);
 
+/*-- in ext2.c --*/
+extern int e2prog (char *name); /* Massive hack for RHEL 5. */
+
 /*-- in lvm.c --*/
 extern int lv_canonical (const char *device, char **ret);
 
@@ -171,6 +174,41 @@ extern void reply (xdrproc_t xdrp, char *ret);
  */
 extern void notify_progress (uint64_t position, uint64_t total);
 
+/* Pulse mode progress messages.
+ *
+ * Call pulse_mode_start to start sending progress messages.
+ *
+ * Call pulse_mode_end along the ordinary exit path (ie. before a
+ * reply message is sent).
+ *
+ * Call pulse_mode_cancel along all error paths *before* any reply is
+ * sent.  pulse_mode_cancel does not modify errno, so it is safe to
+ * call it before reply_with_perror.
+ *
+ * Pulse mode and ordinary notify_progress must not be mixed.
+ */
+extern void pulse_mode_start (void);
+extern void pulse_mode_end (void);
+extern void pulse_mode_cancel (void);
+
+/* Return true iff the buffer is all zero bytes.
+ *
+ * Note that gcc is smart enough to optimize this properly:
+ * http://stackoverflow.com/questions/1493936/faster-means-of-checking-for-an-empty-buffer-in-c/1493989#1493989
+ */
+static inline int
+is_zero (const char *buffer, size_t size)
+{
+  size_t i;
+
+  for (i = 0; i < size; ++i) {
+    if (buffer[i] != 0)
+      return 0;
+  }
+
+  return 1;
+}
+
 /* Helper for functions that need a root filesystem mounted.
  * NB. Cannot be used for FileIn functions.
  */