As reported in sunfishcode/is-terminal#18, there are situations where
`GetFileInformationByHandleEx` can write a file name length that is
longer than the provided buffer. To avoid deferencing memory past the
end of the buffer, use a bounds-checked function to form a slice to
the buffer and handle the out-of-bounds case.
This ports the fix from sunfishcode/is-terminal#19 to std's `is_terminal`
implementation.
Windows: Quote more batch file arguments
Make sure to always quote batch file arguments that contain command prompt special characters.
Additionally add `/d` command line parameter to disable any autorun scripts that may change the way variable expansion works. This makes it more consistent across systems and may help avoid surprises.
## Background Info
[`CreateProcess`](https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-createprocessw) with the `lpApplicationName` set can only be used to run `.exe` files and not script files such as `.bat`. However, for historical reasons, we do have special handling so that `.bat` files will be correctly run with `cmd.exe` as the application.
In Windows, command line arguments are passed as a single string (not an array). Applications can parse this string however they like but most follow the standard MSVC C/C++ convention. But `cmd.exe` uses different argument parsing rules to other Windows programs (because it emulates old DOS). This PR aims to help smooth over some of the differences.
r? libs
".. since this instant was created" is inaccurate and misleading,
consider the following case:
let i1 = Instant::now(); // i1 is created at T1
let i2 = i1 + Duration::from_nanos(0); // i2 is "created" at T2
i2.elapsed(); // at T3
Per the current description, `elapsed()` at T3 should return T3 - T2?
Therefore removes the "was created" in the description of
{Instant,SystemTime}::elapsed(). And since these types represent times,
it's OK to use prepostions with them, e.g. "since this instant".
Rename atomic 'as_mut_ptr' to 'as_ptr' to match Cell (ref #66893)
Originally discussed in https://github.com/rust-lang/rust/issues/66893#issuecomment-1419198623
~~This uses #107706 as a base to avoid a merge conflict once that gets rolled up (so disregard const changes in the diff until it does)~~ all merged & rebased
`@rustbot` label +T-libs-api
r? m-ou-se
Make sure to quote batch file arguments that contain command prompt special characters.
Additionally add `/d` command line parameter to disable any commands that may change the way variable expansion works.
Moving `create_dir_all` out of `ui-fulldeps` is complicated by the fact it sets the current directory. This means it can't be a unit test. Instead, move it to its own integration test.
docs: wrong naming convention in struct keyword doc
Noticed that the naming convention mentioned is not the right one.
As far as I know, PacalCase is the naming convention used for structs names. PacalCase is not the same as camelCase
Explain the default panic hook better
This changes the documentation of `std::panic::set_hook` and `take_hook` to explain how the default panic hook works. In particular the fact that `take_hook` registers the default hook, rather than no hook at all, was missing from the docs.
I also reworded a few things for clarity.
This changes the documentation of `std::panic::set_hook` and `take_hook` to better explain how the default panic hook works. In particular the fact that `take_hook` registers the default hook, rather than no hook at all, was missing from the docs.
Optimize `LazyLock` size
The initialization function was unnecessarily stored separately from the data to be initialized. Since both cannot exist at the same time, a `union` can be used, with the `Once` acting as discriminant. This unfortunately requires some extra methods on `Once` so that `Drop` can be implemented correctly and efficiently.
`@rustbot` label +T-libs +A-atomic
Update the minimum external LLVM to 14
With this change, we'll have stable support for LLVM 14 through 16 (pending release).
For reference, the previous increase to LLVM 13 was #100460.
Added another error to be processed in fallback
This pull request addresses the problem of Rust not being able to read file/directory metadata because the current user doesn't have permission to read the file and are thus inaccessible.
One particular example is `System Volume Information`. But any example can be made by having a file/directory, which the current user can't access even though the system does allow to view the metadata, which is handled by the fallback.
The fallback exists to get the metadata but it was limited to one error type. Having added ERROR_ACCESS_DENIED per Chris Denton's suggestion, file/directory properties are now properly read.
Solution suggested by Chris Denton https://github.com/nushell/nushell/issues/6857#issuecomment-1426847135
Use associated items of `char` instead of freestanding items in `core::char`
The associated functions and constants on `char` have been stable since 1.52 and the freestanding items have soft-deprecated since 1.62 (https://github.com/rust-lang/rust/pull/95566). This PR ~~marks them as "deprecated in future", similar to the integer and floating point modules (`core::{i32, f32}` etc)~~ replaces all uses of `core::char::*` with `char::*` to prepare for future deprecation of `core::char::*`.
Stop at the first `NULL` argument when iterating `argv`
Some C commandline parsers (e.g. GLib and Qt) are replacing already handled arguments in `argv` with `NULL` and move them to the end. That means that `argc` might be bigger than the actual number of non-`NULL` pointers in `argv` at this point.
To handle this we simply stop iterating at the first `NULL` argument.
`argv` is also guaranteed to be `NULL`-terminated so any non-`NULL` arguments after the first `NULL` can safely be ignored.
Fixes https://github.com/rust-lang/rust/issues/105999
Use `__wasilibc_get_environ()` to read the environment variable list
from wasi-libc instead of using `environ`. `environ` is a global
variable which effectively requires wasi-libc to initialize the
environment variables eagerly, and `__wasilibc_get_environ()` is
specifically designed to be an alternative that lets wasi-libc
intiailize its environment variables lazily.
This should have the side effect of fixing at least some of the cases
of #107635.
Stabilize feature `cstr_from_bytes_until_nul`
This PR seeks to stabilize `cstr_from_bytes_until_nul`.
Partially addresses #95027
This function has only been on nightly for about 10 months, but I think it is simple enough that there isn't harm discussing stabilization. It has also had at least a handful of mentions on both the user forum and the discord, so it seems like it's already in use or at least known.
This needs FCP still.
Comment on potential discussion points:
- eventual conversion of `CStr` to be a single thin pointer: this function will still be useful to provide a safe way to create a `CStr` after this change.
- should this return a length too, to address concerns about the `CStr` change? I don't see it as being particularly useful, and it seems less ergonomic (i.e. returning `Result<(&CStr, usize), FromBytesUntilNulError>`). I think users that also need this length without the additional `strlen` call are likely better off using a combination of other methods, but this is up for discussion
- `CString::from_vec_until_nul`: this is also useful, but it doesn't even have a nightly implementation merged yet. I propose feature gating that separately, as opposed to blocking this `CStr` implementation on that
Possible alternatives:
A user can use `from_bytes_with_nul` on a slice up to `my_slice[..my_slice.iter().find(|c| c == 0).unwrap()]`. However; that is significantly less ergonomic, and is a bit more work for the compiler to optimize compared the direct `memchr` call that this wraps.
## New stable API
```rs
// both in core::ffi
pub struct FromBytesUntilNulError(());
impl CStr {
pub const fn from_bytes_until_nul(
bytes: &[u8]
) -> Result<&CStr, FromBytesUntilNulError>
}
```
cc ```@ericseppanen``` original author, ```@Mark-Simulacrum``` original reviewer, ```@m-ou-se``` brought up some issues on the thin pointer CStr
```@rustbot``` modify labels: +T-libs-api +needs-fcp
Clarify wording on f64::round() and f32::round()
"Round half-way cases" is a little confusing (it's a 'garden path sentence' as it's not immediately clear whether round is an adjective or verb).
Make this sentence longer and clearer.
"Round half-way cases" is a little confusing (it's a 'garden path
sentence' as it's not immediately clear whether round is an adjective
or verb).
Make this sentence longer and clearer.
Replace unwrap with ? in TcpListener doc
The example in TcpListener doc returns `std::io::Result<()>` but the code inside the function uses `unwrap()` instead of `?`.
Bump bootstrap compiler to 1.68
This also changes our stage0.json to include the rustc component for the rustfmt pinned nightly toolchain, which is currently necessary due to rustfmt dynamically linking to that toolchain's librustc_driver and libstd.
r? `@pietroalbini`
bootstrap: cleanup the list of extra check cfgs
This PR performs some cleanups on the `EXTRA_CHECK_CFGS` list in bootstrap.
- `target_os=watchos`: no longer relevant because there are now proper targets `*-apple-watchos`
- `target_arch=nvptx64`: target `nvptx64-nvidia-cuda` makes it useless
- `target_arch=le32`: target was removed (https://github.com/rust-lang/rust/pull/45041)
- `release`: was removed from rustfmt (https://github.com/rust-lang/rustfmt/pull/5375 and https://github.com/rust-lang/rustfmt/pull/5449)
- `dont_compile_me`: was removed from stdarch (https://github.com/rust-lang/stdarch/pull/1308)
Also made some external cfg exception mode clear and only activated for rustc and rustc tools (as to not have the Standard Library unintentionally depend on them).
library/std/sys_common: Define MIN_ALIGN for m68k-unknown-linux-gnu
This PR adds the missing definition of MIN_ALIGN for the m68k-unknown-linux target.
Disable `linux_ext` in wasm32 and fortanix rustdoc builds.
The `std::os::unix` module is stubbed out when building docs for these target platforms. The introduction of Linux-specific extension traits caused `std::os::net` to depend on sub-modules of `std::os::unix`, which broke rustdoc for the `wasm32-unknown-unknown` target.
Adding an additional `#[cfg]` guard solves that rustdoc failure by not declaring `linux_ext` on targets with a stubbed `std::os::unix`.
Fixes#105467
Replace libc::{type} with crate::ffi::{type}
Replace libc::{type} imports with crate::ffi::{type} outside of `std::sys` and `std::os`.
Signed-off-by: Ayush Singh <ayushsingh1325@gmail.com>
Stabilize the const_socketaddr feature
Stabilizes `#![feature(const_socketaddr)]`. Tracking issue: #82485Closes#82485
This has been unstably const for over a year now. And the code change simplifying the constness of the `new` constructors has been in stable Rust since 1.64 (a bit over a full release cycle). I'm not aware of any blockers to this stabilization.
Avoid __cxa_thread_atexit_impl on Emscripten
- Fixes https://github.com/rust-lang/rust/issues/91628.
- Fixes https://github.com/emscripten-core/emscripten/issues/15722.
See discussion in both issues.
The TL;DR is that weak linkage causes LLVM to produce broken Wasm, presumably due to pointer mismatch. The code is casting a void pointer to a function pointer with specific signature, but Wasm is very strict about function pointer compatibility, so the resulting code is invalid.
Ideally LLVM should catch this earlier in the process rather than emit invalid Wasm, but it currently doesn't and this is an easy and valid fix, given that Emcripten doesn't have `__cxa_thread_atexit_impl` these days anyway.
Unfortunately, I can't add a regression test as even after looking into this issue for a long time, I couldn't reproduce it with any minimal Rust example, only with extracted LLVM IR or on a large project involving Rust + C++.
Do not use box syntax in `std`
See #94970 and #49733. About half of the `box` instances in `std` do not even need to allocate, the other half can simply be replaced with `Box::new`.
`@rustbot` label +T-libs
r? rust-lang/libs
Add note about absolute paths to Path::join
The note already exists on `PathBuf::push`, but I think it is good to have it on `Path::join` as well since it can cause issues if you are not careful with your input.
Fix the stability attributes for `std::os::fd`.
As `@bjorn3` pointed out [here], I used the wrong stability attribute in #98368 when making `std::os::fd` public. I set it to Rust 1.63, which was when io-safety was stabilized, but it should be Rust 1.66, which was when `std::os::fd` was stabilized.
[here]: https://github.com/rust-lang/rust/pull/98368#discussion_r1063721420
As @bjorn3 pointed out [here], I used the wrong stability attribute in #98368
when making `std::os::fd` public. I set it to Rust 1.63, which was when
io-safety was stabilized, but it should be Rust 1.66, which was when
`std::os::fd` was stabilized.
[here]: https://github.com/rust-lang/rust/pull/98368#discussion_r1063721420
Remove various double spaces in the libraries.
I was just pretty bothered by this when reading the source for a function, and was suggested to check if this happened elsewhere.
Stop probing for statx unless necessary
As is the current toy program:
fn main() -> std::io::Result<()> {
use std::fs;
let metadata = fs::metadata("foo.txt")?;
assert!(!metadata.is_dir());
Ok(())
}
... observed under strace will issue:
[snip]
statx(0, NULL, AT_STATX_SYNC_AS_STAT, STATX_ALL, NULL) = -1 EFAULT (Bad address) statx(AT_FDCWD, "foo.txt", AT_STATX_SYNC_AS_STAT, STATX_ALL, {stx_mask=STATX_ALL|STATX_MNT_ID, stx_attributes=0, stx_mode=S_IFREG|0644, stx_size=0, ...}) = 0
While statx is not necessarily always present, checking for it can be delayed to the first error condition. Said condition may very well never happen, in which case the check got avoided altogether.
Note this is still suboptimal as there still will be programs issuing it, but bulk of the problem is removed.
Tested by forbidding the syscall for the binary and observing it correctly falls back to newfstatat.
While here tidy up the commentary, in particular by denoting some problems with the current approach.
[LSDA] Take ttype_index into account when taking unwind action
If `cs_action != 0`, we should check the `ttype_index` field in action record. If `ttype_index == 0`, a clean up action is taken; otherwise catch action is taken.
This can fix unwind failure on AIX which uses LLVM's libunwind by default. IIUC, rust's LSDA is borrowed from c++ and I'm assuming itanium-cxx-abi https://itanium-cxx-abi.github.io/cxx-abi/exceptions.pdf should be followed, so the fix follows what libcxxabi does. See ec48682ce9/libcxxabi/src/cxa_personality.cpp (L152) for use of `ttype_index`.
- Fixes https://github.com/rust-lang/rust/issues/91628.
- Fixes https://github.com/emscripten-core/emscripten/issues/15722.
See discussion in both issues.
The TL;DR is that weak linkage causes LLVM to produce broken Wasm, presumably due to pointer mismatch. The code is casting a void pointer to a function pointer with specific signature, but Wasm is very strict about function pointer compatibility, so the resulting code is invalid.
Ideally LLVM should catch this earlier in the process rather than emit invalid Wasm, but it currently doesn't and this is an easy and valid fix, given that Emcripten doesn't have `__cxa_thread_atexit_impl` these days anyway.
Unfortunately, I can't add a regression test as even after looking into this issue for a long time, I couldn't reproduce it with any minimal Rust example, only with extracted LLVM IR or on a large project involving Rust + C++.
r? @alexcrichton
std tests: use __OsLocalKeyInner from realstd
This is basically the same as https://github.com/rust-lang/rust/pull/100201, but for __OsLocalKeyInner:
Some std tests are failing in Miri on Windows because [this static](a377893da2/library/std/src/sys/windows/thread_local_key.rs (L234-L239)) is getting duplicated, and Miri does not handle that properly -- Miri does not support this magic `.CRT$XLB` linker section, but instead just looks up this particular hard-coded static in the standard library. This PR lets the test suite use the std static instead of having its own copy.
Fixes https://github.com/rust-lang/miri/issues/2754
r? `@thomcc`
As is the current toy program:
fn main() -> std::io::Result<()> {
use std::fs;
let metadata = fs::metadata("foo.txt")?;
assert!(!metadata.is_dir());
Ok(())
}
... observed under strace will issue:
[snip]
statx(0, NULL, AT_STATX_SYNC_AS_STAT, STATX_ALL, NULL) = -1 EFAULT (Bad address)
statx(AT_FDCWD, "foo.txt", AT_STATX_SYNC_AS_STAT, STATX_ALL, {stx_mask=STATX_ALL|STATX_MNT_ID, stx_attributes=0, stx_mode=S_IFREG|0644, stx_size=0, ...}) = 0
While statx is not necessarily always present, checking for it can be
delayed to the first error condition. Said condition may very well never
happen, in which case the check got avoided altogether.
Note this is still suboptimal as there still will be programs issuing
it, but bulk of the problem is removed.
Tested by forbidding the syscall for the binary and observing it
correctly falls back to newfstatat.
While here tidy up the commentary, in particular by denoting some
problems with the current approach.
