sndio module

Index: qemu-options.hx
--- qemu-options.hx.orig
+++ qemu-options.hx
@@ -767,6 +767,9 @@ DEF("audiodev", HAS_ARG, QEMU_OPTION_audiodev,
     "-audiodev sdl,id=id[,prop[=value][,...]]\n"
     "                in|out.buffer-count= number of buffers\n"
 #endif
+#ifdef CONFIG_AUDIO_SNDIO
+    "-audiodev sndio,id=id[,prop[=value][,...]]\n"
+#endif
 #ifdef CONFIG_SPICE
     "-audiodev spice,id=id[,prop[=value][,...]]\n"
 #endif
@@ -932,6 +935,19 @@ SRST
 
     ``in|out.buffer-count=count``
         Sets the count of the buffers.
+
+``-audiodev sndio,id=id[,prop[=value][,...]]``
+    Creates a backend using SNDIO. This backend is available on
+    OpenBSD and most other Unix-like systems.
+
+    Sndio specific options are:
+
+    ``in|out.dev=device``
+        Specify the sndio device to use for input and/or output. Default
+        is ``default``.
+
+    ``in|out.latency=usecs``
+        Sets the desired period length in microseconds.
 
 ``-audiodev spice,id=id[,prop[=value][,...]]``
     Creates a backend that sends audio through SPICE. This backend
