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Implement __wasi_fd_fdstat_get for Windows.

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This commit fully implements `__wasi_fd_fdstat_get` on Windows so that
the descriptor flags can be determined.

It does this by calling into `NtQueryInformationFile` (safe to call from
user mode) to get the open mode and access of the underlying OS handle.

`NtQueryInformationFile` isn't included in the `winapi` crate, so it is
manually being linked against.

This commit also fixes several bugs on Windows:

* Ignore `__WASI_FDFLAG_NONBLOCK` by not setting `FILE_FLAG_OVERLAPPED`
  on file handles (the POSIX behavior for `O_NONBLOCK` on files).
* Use `FILE_FLAG_WRITE_THROUGH` for the `__WASI_FDFLAG_?SYNC` flags.
* `__WASI_FDFLAG_APPEND` should disallow `FILE_WRITE_DATA` access to
  force append-only on write operations.
* Use `GENERIC_READ` and `GENERIC_WRITE` access flags.  The
  latter is required when opening a file for truncation.
This commit is contained in:
Peter Huene
2019-11-12 16:41:54 -08:00
committed by Jakub Konka
parent 3e7bc745a2
commit 0cf54ffeba
11 changed files with 245 additions and 172 deletions
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4
crates/wasi-common/src/sys/windows/fdentry_impl.rs
View File

@@ -53,13 +53,13 @@ pub(crate) unsafe fn determine_type_and_access_rights<Handle: AsRawHandle>(
wasi::__wasi_rights_t,
wasi::__wasi_rights_t,
)> {
use winx::file::{get_file_access_mode, AccessMode};
use winx::file::{query_access_information, AccessMode};
let (file_type, mut rights_base, rights_inheriting) = determine_type_rights(handle)?;
match file_type {
wasi::__WASI_FILETYPE_DIRECTORY | wasi::__WASI_FILETYPE_REGULAR_FILE => {
let mode = get_file_access_mode(handle.as_raw_handle())?;
let mode = query_access_information(handle.as_raw_handle())?;
if mode.contains(AccessMode::FILE_GENERIC_READ) {
rights_base |= wasi::__WASI_RIGHTS_FD_READ;
}