This change weakens the descriptions of the
`{as,into,from}_raw_{fd,handle,socket}` descriptions from saying that
they *do* express ownership relations to say that they are *typically used*
in ways that express ownership relations. This needed needed since, for
example, std's own [`RawFd`] implements `{As,From,Into}Fd` without any of
the ownership relationships.
This adds proper `# Safety` comments to `from_raw_{fd,handle,socket}`,
adds the requirement that raw handles be not opened with the
`FILE_FLAG_OVERLAPPED` flag, and merges the `OwnedHandle::from_raw_handle`
comment into the main `FromRawHandle::from_raw_handle` comment.
And, this changes `HandleOrNull` and `HandleOrInvalid` to not implement
`FromRawHandle`, since they are intended for limited use in FFI situations,
and not for generic use, and they have constraints that are stronger than
the those of `FromRawHandle`.
[`RawFd`]: https://doc.rust-lang.org/stable/std/os/unix/io/type.RawFd.html
Change Termination::report return type to ExitCode
Related to https://github.com/rust-lang/rust/issues/43301
The goal of this change is to minimize the forward compatibility risks in stabilizing Termination. By using the opaque type `ExitCode` instead of an `i32` we leave room for us to evolve the API over time to provide what cross-platform consistency we can / minimize footguns when working with exit codes, where as stabilizing on `i32` would limit what changes we could make in the future in how we represent and construct exit codes.
kmc-solid: Increase the default stack size
This PR increases the default minimum stack size on the [`*-kmc-solid_*`](https://doc.rust-lang.org/nightly/rustc/platform-support/kmc-solid.html) Tier 3 targets to 64KiB (Arm) and 128KiB (AArch64).
This value was chosen as a middle ground between supporting a relatively complex program (e.g., an application using a full-fledged off-the-shelf web server framework) with no additional configuration and minimizing resource consumption for the embedded platform that doesn't support lazily-allocated pages nor over-commitment (i.e., wasted stack spaces are wasted physical memory). If the need arises, the users can always set the `RUST_MIN_STACK` environmental variable to override the default stack size or use the platform API directly.
Errors from pthread_sigmask(3) were handled using cvt(), which expects a
return value of -1 on error and uses errno.
However, pthread_sigmask(3) returns 0 on success and an error number
otherwise.
Fix it by replacing cvt() with cvt_nz().
kmc-solid: Inherit the calling task's base priority in `Thread::new`
This PR fixes the initial priority calculation of spawned threads on the [`*-kmc-solid_*`](https://doc.rust-lang.org/nightly/rustc/platform-support/kmc-solid.html) Tier 3 targets.
Fixes a spawned task (an RTOS object on top of which threads are implemented for this target; unrelated to async tasks) getting an unexpectedly higher priority if it's spawned by a task whose priority is temporarily boosted by a priority-protection mutex.
unix: Use metadata for `DirEntry::file_type` fallback
When `DirEntry::file_type` fails to match a known `d_type`, we should
fall back to `DirEntry::metadata` instead of a bare `lstat`, because
this is faster and more reliable on targets with `fstatat`.
Fixes a spawned task getting an unexpectedly higher priority if it's
spawned by a task whose priority is temporarily boosted by a priority-
protection mutex.
When `DirEntry::file_type` fails to match a known `d_type`, we should
fall back to `DirEntry::metadata` instead of a bare `lstat`, because
this is faster and more reliable on targets with `fstatat`.
fs: Don't copy d_name from struct dirent
The dirent returned from readdir() is only guaranteed to be valid for
d_reclen bytes on common platforms. Since we copy the name separately
anyway, we can copy everything except d_name into DirEntry::entry.
Fixes#93384.
Move unstable is_{arch}_feature_detected! macros to std::arch
These macros are unstable, except for `is_x86_feature_detected` which is still exported from the crate root for backwards-compatibility.
This should unblock the stabilization of `is_aarch64_feature_detected`.
r? ```@m-ou-se```
The dirent returned from readdir() is only guaranteed to be valid for
d_reclen bytes on common platforms. Since we copy the name separately
anyway, we can copy everything except d_name into DirEntry::entry.
Fixes#93384.
kmc-solid: Implement `net::FileDesc::duplicate`
This PR implements `std::sys::solid::net::FileDesc::duplicate`, which was accidentally left out when this target was added by #86191.
Bump libc and fix remove_dir_all on Fuchsia after CVE fix
With the previous `is_dir` impl, we would attempt to unlink
a directory in the None branch, but Fuchsia supports returning
ENOTEMPTY from unlinkat() without the AT_REMOVEDIR flag because
we don't currently differentiate unlinking files and directories
by default.
On the Fuchsia side I've opened https://fxbug.dev/92273 to discuss
whether this is the correct behavior, but it doesn't seem like
addressing the error code is necessary to make our tests happy.
Depends on https://github.com/rust-lang/libc/pull/2654 since we
apparently haven't needed to reference DT_UNKNOWN before this.
With the previous `is_dir` impl, we would attempt to unlink
a directory in the None branch, but Fuchsia supports returning
ENOTEMPTY from unlinkat() without the AT_REMOVEDIR flag because
we don't currently differentiate unlinking files and directories
by default.
On the Fuchsia side I've opened https://fxbug.dev/92273 to discuss
whether this is the correct behavior, but it doesn't seem like
addressing the error code is necessary to make our tests happy.
Updates std's libc crate to include DT_UNKNOWN for Fuchsia.
Avoid double panics when using `TempDir` in tests
`TempDir` could panic on drop if `remove_dir_all` returns an error. If this happens while already panicking, the test process would abort and therefore not show the test results.
This PR tries to avoid such double panics.
Add os::unix::net::SocketAddr::from_path
Creates a new SocketAddr from a path, supports both regular paths and
abstract namespaces.
Note that `SocketAddr::from_abstract_namespace` could be removed after this as `SocketAddr::unix` also supports abstract namespaces.
Updates #65275
Unblocks https://github.com/tokio-rs/mio/issues/1527
r? `@m-ou-se`
With the addition of `sock_accept()` to snapshot1, simple networking via
a passed `TcpListener` is possible. This patch implements the basics to
make a simple server work.
Signed-off-by: Harald Hoyer <harald@profian.com>
Define c_char using cfg_if rather than repeating 40-line cfg
Libstd has a 40-line cfg that defines the targets on which `c_char` is unsigned, and then repeats the same cfg with `not(…)` for the targets on which `c_char` is signed.
This PR replaces it with a `cfg_if!` in which an `else` takes care of the signed case.
I confirmed that `x.py doc library/std` inlines the type alias because c_char_definition is not a publicly accessible path:
Make available the remaining float intrinsics that require runtime support
from a platform's libm, and thus cannot be included in a no-deps libcore,
by exposing them through a sealed trait, `std::simd::StdFloat`.
We might use the trait approach a bit more in the future, or maybe not.
Ideally, this trait doesn't stick around, even if so.
If we don't need to intermesh it with std, it can be used as a crate,
but currently that is somewhat uncertain.
The creation of libc::sockaddr_un is a safe operation, no need for it to
be unsafe.
This also uses the more performant copy_nonoverlapping instead of an
iterator.
Following up on #88564, this adds documentation explaining why
`BorrowedFd::to_owned` returns another `BorrowedFd` rather than an
`OwnedFd`. And similar for `BorrowedHandle` and `BorrowedSocket`.
