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Fix file_base::append on windows #1567

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Fix file_base::append on windows #1567

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11 changes: 5 additions & 6 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 @@ -67,6 +67,8 @@ asio::error_code win_iocp_file_service::open(
access = GENERIC_WRITE;
else if ((open_flags & file_base::read_write) != 0)
access = GENERIC_READ | GENERIC_WRITE;
else if ((open_flags & file_base::append) != 0)
access = GENERIC_WRITE;

DWORD share = FILE_SHARE_READ | FILE_SHARE_WRITE;

Expand All @@ -82,6 +84,8 @@ asio::error_code win_iocp_file_service::open(
{
if ((open_flags & file_base::truncate) != 0)
disposition = TRUNCATE_EXISTING;
else if ((open_flags & file_base::append) != 0)
disposition = OPEN_ALWAYS;
else
disposition = OPEN_EXISTING;
}
Expand Down Expand Up @@ -111,17 +115,12 @@ asio::error_code win_iocp_file_service::open(
return ec;
}
}
}
if (disposition == OPEN_ALWAYS || disposition == OPEN_EXISTING)
{
if ((open_flags & file_base::append) != 0)
else if ((open_flags & file_base::append) != 0)
{
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();
Expand Down