From: Xuzhou Cheng <xuzhou.ch...@windriver.com> The combination of GENERIC_WRITE and FILE_SHARE_READ options does not allow the same file to be opened again by CreateFile() from another QEMU process with the same options when the previous QEMU process still holds the file handle openned.
As per [1] we should add FILE_SHARE_WRITE to the share mode to allow such use case. This change makes the behavior be consisten with the POSIX platforms. [1] https://docs.microsoft.com/en-us/windows/win32/fileio/creating-and-opening-files Signed-off-by: Xuzhou Cheng <xuzhou.ch...@windriver.com> Signed-off-by: Bin Meng <bin.m...@windriver.com> --- chardev/char-file.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/chardev/char-file.c b/chardev/char-file.c index 2fd80707e5..66385211eb 100644 --- a/chardev/char-file.c +++ b/chardev/char-file.c @@ -60,8 +60,8 @@ static void qmp_chardev_open_file(Chardev *chr, flags = CREATE_ALWAYS; } - out = CreateFile(file->out, accessmode, FILE_SHARE_READ, NULL, flags, - FILE_ATTRIBUTE_NORMAL, NULL); + out = CreateFile(file->out, accessmode, FILE_SHARE_READ | FILE_SHARE_WRITE, + NULL, flags, FILE_ATTRIBUTE_NORMAL, NULL); if (out == INVALID_HANDLE_VALUE) { error_setg(errp, "open %s failed", file->out); return; -- 2.34.1
