[PATCH spice-common 1/2] marshaller: learn to describe fd passing in messages

[Marc-André Lureau <marcandre.lureau@xxxxxxxxx>]

The marshaller can't serialize fd in memory stream. Instead, append the
fd to the marshaller structure. The marshaller user is responsible for
sending the fd when the message is sent. The fd to send can be retrieved
with spice_marshaller_get_fd().

Note: only a single fd is supported with this API, supporting multiple
fd is left for the future if it becomes necessary.

Signed-off-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxx>
---
 common/marshaller.c | 24 ++++++++++++++++++++++++
 common/marshaller.h |  3 +++
 2 files changed, 27 insertions(+)

diff --git a/common/marshaller.c b/common/marshaller.c
index cedb321..c967371 100644
--- a/common/marshaller.c
+++ b/common/marshaller.c
@@ -19,11 +19,14 @@
 #include <config.h>
 #endif
 
+#include "log.h"
 #include "marshaller.h"
 #include "mem.h"
 #include <string.h>
 #include <stdlib.h>
 #include <assert.h>
+#include <unistd.h>
+#include <stdio.h>
 
 #ifdef WORDS_BIGENDIAN
 #define write_int8(ptr,v) (*((int8_t *)(ptr)) = v)
@@ -84,6 +87,7 @@ struct SpiceMarshaller {
     MarshallerItem *items;
 
     MarshallerItem static_items[N_STATIC_ITEMS];
+    int fd;
 };
 
 struct SpiceMarshallerData {
@@ -111,6 +115,7 @@ static void spice_marshaller_init(SpiceMarshaller *m,
     m->n_items = 0;
     m->items_size = N_STATIC_ITEMS;
     m->items = m->static_items;
+    m->fd = -1;
 }
 
 SpiceMarshaller *spice_marshaller_new(void)
@@ -613,3 +618,22 @@ void *spice_marshaller_add_int8(SpiceMarshaller *m, int8_t v)
     write_int8(ptr, v);
     return (void *)ptr;
 }
+
+void spice_marshaller_add_fd(SpiceMarshaller *m, int fd)
+{
+    spice_assert(m->fd == -1);
+
+    m->fd = dup(fd);
+    if (m->fd == -1) {
+        perror("dup");
+    }
+}
+
+int spice_marshaller_get_fd(SpiceMarshaller *m)
+{
+    int fd = m->fd;
+
+    m->fd = -1;
+
+    return fd;
+}
diff --git a/common/marshaller.h b/common/marshaller.h
index e19c0f6..b698b69 100644
--- a/common/marshaller.h
+++ b/common/marshaller.h
@@ -66,6 +66,9 @@ void *spice_marshaller_add_int8(SpiceMarshaller *m, int8_t v);
 
 void  spice_marshaller_set_uint32(SpiceMarshaller *m, void *ref, uint32_t v);
 
+void  spice_marshaller_add_fd(SpiceMarshaller *m, int fd);
+int   spice_marshaller_get_fd(SpiceMarshaller *m);
+
 SPICE_END_DECLS
 
 #endif
-- 
2.5.0

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