`GetPhysicallyInstalledSystemMemory` uses SMBios to grab the physical
memory size which can lead to unecessary allocation and inacurate
representation of the total memory. Using `System_Basic_Information`
help to retrieve the physical memory which is not reserved for the
kernel/tables. This aligns better with the linux side as `/proc/meminfo`
does the same thing.
`GetProcessMemoryInfo` is implemented using `NtQueryInformationProcess`
with `ProcessVmCounters` to obtain `VM_COUNTERS`. The structs, enum
definitions are found in `winternl.h` or `ntddk.h` in the latest WDK.
This should give the same results as using `K32GetProcessMemoryInfo`
* Fix GetFileInformationByHandle compile error
The wrapper function was mistakenly referencing ntdll.zig when the actual function is declared in kernel32.zig.
* delete GetFileInformationByHandle since it's not used by the stdlib
This function is unused, and the current implementation contains a few footguns:
- The current wrapper treats all possible errors as unexpected, even likely ones like BUFFER_OVERFLOW (which is returned if the size of the out_buffer is too small to contain all the variable-length members of the requested info, which the user may not actually care about)
- Each caller may need to handle errors differently, different errors might be possible depending on the FILE_INFORMATION_CLASS, etc, and making a wrapper that handles all of those different use-cases nicely seems like it'd be more trouble than it's worth (FILE_INFORMATION_CLASS has 76 different possible values)
If a wrapper for NtQueryInformationFile is wanted, then it should probably have wrapper functions per-use-case, like how QueryObjectName wraps NtQueryObject for the `ObjectNameInformation` class
This error means that there *was* a file in this location on the file
system, but it was deleted. However, the OS is not finished with the
deletion operation, and so this CreateFile call has failed. There is not
really a sane way to handle this other than retrying the creation after
the OS finishes the deletion.
- 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)
This fixes a bug in std.net caused during the introduction of
meta.assumeSentinel due to the unfortunate semantics of mem.span()
This leaves only 3 remaining uses of meta.assumeSentinel() in the
standard library, each of which could be a simple @ptrCast([*:0]T, foo)
instead. I think this function should likely be removed.
windows: add RtlCaptureContext, RtlLookupFunctionEntry, RtlVirtualUnwind and supporting types
windows: fix alignment of CONTEXT structs to match winnt.h as required by RtlCaptureContext (fxsave instr)
windows aarch64: fix __chkstk being defined twice if libc is not linked on msvc
Co-authored-by: Jakub Konka <kubkon@jakubkonka.com>
- Add .StaticInitializer to ValueRenderLocation to indicate that the emitted values
must be constant expressions (no function calls, struct casting).
- Add new path for special float types (nan, inf) that works in constant expressions
- Implement windows.teb() using a syscall for .stage2_c because x64 MSVC
doesn't support any kind of inline asm
The name of the game here is to avoid CreateProcessW calls at all costs,
and only ever try calling it when we have a real candidate for execution.
Secondarily, we want to minimize the number of syscalls used when checking
for each PATHEXT-appended version of the app name.
An overview of the technique used:
- Open the search directory for iteration (either cwd or a path from PATH)
- Use NtQueryDirectoryFile with a wildcard filename of `<app name>*` to
check if anything that could possibly match either the unappended version
of the app name or any of the versions with a PATHEXT value appended exists.
- If the wildcard NtQueryDirectoryFile call found nothing, we can exit early
without needing to use PATHEXT at all.
This allows us to use a <open dir, NtQueryDirectoryFile, close dir> sequence
for any directory that doesn't contain any possible matches, instead of having
to use a separate look up for each individual filename combination (unappended +
each PATHEXT appended). For directories where the wildcard *does* match something,
we only need to do a maximum of <number of supported PATHEXT extensions> more
NtQueryDirectoryFile calls.
---
In addition, we now only evaluate the extensions in PATHEXT that we know we can handle (.COM, .EXE, .BAT, .CMD) and ignore the rest.
---
This commit also makes two edge cases match Windows behavior:
- If an app name has the extension .exe and it is attempted to be executed, that is now treated as unrecoverable and InvalidExe is immediately returned no matter where the .exe is (cwd or in the PATH). This matches the behavior of the Windows cmd.exe.
- If the app name contains more than just a filename (e.g. it has path separators), then it is excluded from PATH searching and only does a cwd search. This matches the behavior of Windows cmd.exe.
There are still a few occurrences of "stage1" in the standard library
and self-hosted compiler source, however, these instances need a bit
more careful inspection to ensure no breakage.
Ran into this when using a program that uses CreateFileMapping and then trying to call `std.fs.createFile` on the mapped file. More info can be found here:
https://stackoverflow.com/questions/41844842/when-error-1224-error-user-mapped-file-occurs
Before:
```
error.Unexpected NTSTATUS=0xc0000243
C:\Users\Ryan\Programming\Zig\zig\lib\std\os\windows.zig:138:40: 0x7ff74e957466 in OpenFile (test.exe.obj)
else => return unexpectedStatus(rc),
^
```
After:
```
FAIL (AccessDenied)
C:\Users\Ryan\Programming\Zig\zig\lib\std\os\windows.zig:137:30: 0x7ff7f5b776ea in OpenFile (test.exe.obj)
.USER_MAPPED_FILE => return error.AccessDenied,
^
```
