[PATCH v4 05/32] qemu-sockets: introduce socket_address_parse_named_fd()

[Vladimir Sementsov-Ogievskiy]

Add function that transforms named fd inside SocketAddress structure
into number representation. This way it may be then used in a context
where current monitor is not available.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 include/qemu/sockets.h | 14 ++++++++++++++
 util/qemu-sockets.c    | 19 +++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/include/qemu/sockets.h b/include/qemu/sockets.h
index 7d1f813576..1f4f18a44a 100644
--- a/include/qemu/sockets.h
+++ b/include/qemu/sockets.h
@@ -111,4 +111,18 @@ SocketAddress *socket_remote_address(int fd, Error **errp);
  */
 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr);
 
+/**
+ * socket_address_parse_named_fd:
+ *
+ * Modify @addr, replacing named fd by corresponding number.
+ *
+ * Parsing named fd (by sockget_get_fd) is not possible in context where
+ * current monitor is not available. So, SocketAddress user may first call
+ * socket_parse_named_fd() to parse named fd in advance, and then pass @addr to
+ * the context where monitor is not available.
+ *
+ * Return 0 on success.
+ */
+int socket_address_parse_named_fd(SocketAddress *addr, Error **errp);
+
 #endif /* QEMU_SOCKETS_H */
diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
index 2463c49773..86316b6314 100644
--- a/util/qemu-sockets.c
+++ b/util/qemu-sockets.c
@@ -1141,6 +1141,25 @@ static int socket_get_fd(const char *fdstr, Error **errp)
     return fd;
 }
 
+int socket_address_parse_named_fd(SocketAddress *addr, Error **errp)
+{
+    int fd;
+
+    if (addr->type != SOCKET_ADDRESS_TYPE_FD) {
+        return 0;
+    }
+
+    fd = socket_get_fd(addr->u.fd.str, errp);
+    if (fd < 0) {
+        return fd;
+    }
+
+    g_free(addr->u.fd.str);
+    addr->u.fd.str = g_strdup_printf("%d", fd);
+
+    return 0;
+}
+
 int socket_connect(SocketAddress *addr, Error **errp)
 {
     int fd;
-- 
2.29.2