[PATCH v2 2/6] util/oslib-win32: Add a helper to get the Windows version

[Bin Meng <bmeng.cn@gmail.com>]

From: Bin Meng <bin.meng@windriver.com>

This adds a helper to get the Windows version via the RtlGetVersion
call, for QEMU codes to determine the Windows version at run-time.

Signed-off-by: Xuzhou Cheng <xuzhou.cheng@windriver.com>
Signed-off-by: Bin Meng <bin.meng@windriver.com>
---

(no changes since v1)

 include/sysemu/os-win32.h |  2 ++
 util/oslib-win32.c        | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/sysemu/os-win32.h b/include/sysemu/os-win32.h
index edc3b38a57..1e324026a4 100644
--- a/include/sysemu/os-win32.h
+++ b/include/sysemu/os-win32.h
@@ -204,6 +204,8 @@ ssize_t qemu_recv_wrap(int sockfd, void *buf, size_t len, int flags);
 ssize_t qemu_recvfrom_wrap(int sockfd, void *buf, size_t len, int flags,
                            struct sockaddr *addr, socklen_t *addrlen);
 
+void os_get_win_version(RTL_OSVERSIONINFOEXW *info);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index 5723d3eb4c..6d2387b9ff 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -547,3 +547,18 @@ int qemu_msync(void *addr, size_t length, int fd)
      */
     return qemu_fdatasync(fd);
 }
+
+void os_get_win_version(RTL_OSVERSIONINFOEXW *info)
+{
+    typedef LONG (WINAPI *rtl_get_version_t)(PRTL_OSVERSIONINFOEXW);
+
+    /* RtlGetVersion is available starting with Windows 2000 */
+    HMODULE module = GetModuleHandle("ntdll");
+    PVOID fun = GetProcAddress(module, "RtlGetVersion");
+    rtl_get_version_t rtl_get_version = (rtl_get_version_t)fun;
+
+    info->dwOSVersionInfoSize = sizeof(RTL_OSVERSIONINFOEXW);
+    rtl_get_version(info);
+
+    return;
+}
-- 
2.34.1