From 93b35c69998398e962bff84f3e5006afa122fbde Mon Sep 17 00:00:00 2001
From: Ryan Liptak <squeek502@hotmail.com>
Date: Wed, 8 Mar 2023 01:18:33 -0800
Subject: os.isCygwinPty: Fix a bug, replace kernel32 call, and optimize

- Fixes the first few code units of the name being omitted (it was using `@sizeOf(FILE_NAME_INFO)` as the start of the name bytes, but that includes the length of the dummy [1]u16 field and padding; instead the start should be the offset of the dummy [1]u16 field)
- Replaces kernel32.GetFileInformationByHandleEx call with ntdll.NtQueryInformationFile
  + Contributes towards #1840
- Checks that the handle is a named pipe first before querying and checking the name, which is a much faster call than NtQueryInformationFile (this was about a 10x speedup in my probably-not-so-good/take-it-with-a-grain-of-salt benchmarking)
---
 lib/std/os/windows.zig       | 23 +++++++++++++++++++++++
 lib/std/os/windows/ntdll.zig |  9 +++++++++
 2 files changed, 32 insertions(+)

(limited to 'lib/std/os')

diff --git a/lib/std/os/windows.zig b/lib/std/os/windows.zig
index b63fdb9f92..23aa378e9e 100644
--- a/lib/std/os/windows.zig
+++ b/lib/std/os/windows.zig
@@ -2472,6 +2472,29 @@ pub const FILE_INFORMATION_CLASS = enum(c_int) {
     FileMaximumInformation,
 };
 
+pub const FILE_FS_DEVICE_INFORMATION = extern struct {
+    DeviceType: DEVICE_TYPE,
+    Characteristics: ULONG,
+};
+
+pub const FS_INFORMATION_CLASS = enum(c_int) {
+    FileFsVolumeInformation = 1,
+    FileFsLabelInformation,
+    FileFsSizeInformation,
+    FileFsDeviceInformation,
+    FileFsAttributeInformation,
+    FileFsControlInformation,
+    FileFsFullSizeInformation,
+    FileFsObjectIdInformation,
+    FileFsDriverPathInformation,
+    FileFsVolumeFlagsInformation,
+    FileFsSectorSizeInformation,
+    FileFsDataCopyInformation,
+    FileFsMetadataSizeInformation,
+    FileFsFullSizeInformationEx,
+    FileFsMaximumInformation,
+};
+
 pub const OVERLAPPED = extern struct {
     Internal: ULONG_PTR,
     InternalHigh: ULONG_PTR,
diff --git a/lib/std/os/windows/ntdll.zig b/lib/std/os/windows/ntdll.zig
index 8c5260c1bc..58cba356a2 100644
--- a/lib/std/os/windows/ntdll.zig
+++ b/lib/std/os/windows/ntdll.zig
@@ -18,6 +18,7 @@ const IO_STATUS_BLOCK = windows.IO_STATUS_BLOCK;
 const LARGE_INTEGER = windows.LARGE_INTEGER;
 const OBJECT_INFORMATION_CLASS = windows.OBJECT_INFORMATION_CLASS;
 const FILE_INFORMATION_CLASS = windows.FILE_INFORMATION_CLASS;
+const FS_INFORMATION_CLASS = windows.FS_INFORMATION_CLASS;
 const UNICODE_STRING = windows.UNICODE_STRING;
 const RTL_OSVERSIONINFOW = windows.RTL_OSVERSIONINFOW;
 const FILE_BASIC_INFORMATION = windows.FILE_BASIC_INFORMATION;
@@ -232,6 +233,14 @@ pub extern "ntdll" fn NtQueryObject(
     ReturnLength: ?*ULONG,
 ) callconv(WINAPI) NTSTATUS;
 
+pub extern "ntdll" fn NtQueryVolumeInformationFile(
+    FileHandle: HANDLE,
+    IoStatusBlock: *IO_STATUS_BLOCK,
+    FsInformation: *anyopaque,
+    Length: ULONG,
+    FsInformationClass: FS_INFORMATION_CLASS,
+) callconv(WINAPI) NTSTATUS;
+
 pub extern "ntdll" fn RtlWakeAddressAll(
     Address: ?*const anyopaque,
 ) callconv(WINAPI) void;
-- 
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