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Fix file_base::append for both create/open for windows stream_file. #1500

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Fix file_base::append for both create/open for windows stream_file. #1500

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16 changes: 12 additions & 4 deletions asio/include/asio/detail/impl/win_iocp_file_service.ipp
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,7 @@ asio::error_code win_iocp_file_service::open(
if ((open_flags & file_base::sync_all_on_write) != 0)
flags |= FILE_FLAG_WRITE_THROUGH;

impl.offset_ = 0;
HANDLE handle = ::CreateFileA(path, access, share, 0, disposition, flags, 0);
if (handle != INVALID_HANDLE_VALUE)
{
Expand All @@ -110,10 +111,18 @@ asio::error_code win_iocp_file_service::open(
return ec;
}
}
else if ((open_flags & file_base::append) != 0)
}
if (disposition == OPEN_ALWAYS || disposition == OPEN_EXISTING)
{
if ((open_flags & file_base::append) != 0)
{
if (::SetFilePointer(handle, 0, 0, FILE_END)
== INVALID_SET_FILE_POINTER)
LARGE_INTEGER distance, new_offset;
distance.QuadPart = 0;
if (::SetFilePointerEx(handle, distance, &new_offset, FILE_END))
{
impl.offset_ = static_cast<uint64_t>(new_offset.QuadPart);
}
else
{
DWORD last_error = ::GetLastError();
::CloseHandle(handle);
Expand All @@ -127,7 +136,6 @@ asio::error_code win_iocp_file_service::open(
handle_service_.assign(impl, handle, ec);
if (ec)
::CloseHandle(handle);
impl.offset_ = 0;
ASIO_ERROR_LOCATION(ec);
return ec;
}
Expand Down