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authorMichael Roth <mdroth@linux.vnet.ibm.com>2012-01-20 19:01:30 -0600
committerMichael Roth <mdroth@linux.vnet.ibm.com>2012-02-23 15:43:49 -0600
commit7868e26e5930f49ca942311885776b938dcf3b77 (patch)
treed1fad8cd6f57209d7812d55dd5fe13d2460a05df /Makefile.objs
parentd8ca685acbd06b5cccd9fcd7866ded1f453b8311 (diff)
qemu-ga: add initial win32 support
This adds a win32 channel implementation that makes qemu-ga functional on Windows using virtio-serial (unix-listen/isa-serial not currently implemented). Unlike with the posix implementation, we do not use GIOChannel for the following reasons: - glib calls stat() on an fd to check whether S_IFCHR is set, which is the case for virtio-serial on win32. Because of that, a one-time check to determine whether the channel is readable is done by making a call to PeekConsoleInput(), which reports the underlying handle is not a valid console handle, and thus we can never read from the channel. - if one goes as far as to "trick" glib into thinking it is a normal file descripter, the buffering is done in such a way that data written to the output stream will subsequently result in that same data being read back as if it were input, causing an error loop. furthermore, a forced flush of the channel only moves the data into a secondary buffer managed by glib, so there's no way to prevent output from getting read back as input. The implementation here ties into the glib main loop by implementing a custom GSource that continually submits asynchronous/overlapped I/O to fill an GAChannel-managed read buffer, and tells glib to poll the corresponding event handle for a completion whenever there is no data/RPC in the read buffer to notify the main application about.
Diffstat (limited to 'Makefile.objs')
-rw-r--r--Makefile.objs2
1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile.objs b/Makefile.objs
index 39c7f4ef74..67deac8067 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -426,7 +426,7 @@ common-obj-y += qmp.o hmp.o
qga-nested-y = commands.o guest-agent-command-state.o
qga-nested-$(CONFIG_POSIX) += commands-posix.o channel-posix.o
-qga-nested-$(CONFIG_WIN32) += commands-win32.o
+qga-nested-$(CONFIG_WIN32) += commands-win32.o channel-win32.o
qga-obj-y = $(addprefix qga/, $(qga-nested-y))
qga-obj-y += qemu-ga.o module.o
qga-obj-$(CONFIG_WIN32) += oslib-win32.o