Added state snapshot support for QemuD.

With this patch, both modem and sensor functionality are correctly
restored when a state snapshot is loaded. This was not the case
previously because communication with either of these services is
done using the qemud daemon, which did not support snapshots.

The boot-properties and charpipe services have no specific save/load
functionality yet, since the framework itself should be reviewed
first. Adding support for bootproperties should not be difficult
though, and charpipe may not need it.

For a description of the high-level process for saving and loading,
consult section IV "State snapshots" in docs/ANDROID-QEMUD.TXT.

Change-Id: I5b06d88b911ca096e78060163174904c48a01c66

1 files changed, 16 insertions, 0 deletions

diff --git a/savevm.c b/savevm.c
index 458e31d..8f0d8f1 100644
--- a/savevm.c
+++ b/savevm.c
@@ -724,6 +724,22 @@ int   qemu_get_struct(QEMUFile*  f, const QField*  fields, void*  s)
     return 0;
 }
 
+/* write a float to file */
+void qemu_put_float(QEMUFile *f, float v)
+{
+    uint8_t *bytes = (uint8_t*) &v;
+    qemu_put_buffer(f, bytes, sizeof(float));
+}
+
+/* read a float from file */
+float qemu_get_float(QEMUFile *f)
+{
+    uint8_t bytes[sizeof(float)];
+    qemu_get_buffer(f, bytes, sizeof(float));
+
+    return *((float*) bytes);
+}
+
 typedef struct SaveStateEntry {
     char idstr[256];
     int instance_id;