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|
//! `rustix` provides efficient memory-safe and [I/O-safe] wrappers to
//! POSIX-like, Unix-like, Linux, and Winsock syscall-like APIs, with
//! configurable backends.
//!
//! With rustix, you can write code like this:
//!
//! ```
//! # #[cfg(feature = "net")]
//! # fn read(sock: std::net::TcpStream, buf: &mut [u8]) -> std::io::Result<()> {
//! # use rustix::net::RecvFlags;
//! let nread: usize = rustix::net::recv(&sock, buf, RecvFlags::PEEK)?;
//! # let _ = nread;
//! # Ok(())
//! # }
//! ```
//!
//! instead of like this:
//!
//! ```
//! # #[cfg(feature = "net")]
//! # fn read(sock: std::net::TcpStream, buf: &mut [u8]) -> std::io::Result<()> {
//! # #[cfg(unix)]
//! # use std::os::unix::io::AsRawFd;
//! # #[cfg(target_os = "wasi")]
//! # use std::os::wasi::io::AsRawFd;
//! # #[cfg(windows)]
//! # use windows_sys::Win32::Networking::WinSock as libc;
//! # #[cfg(windows)]
//! # use std::os::windows::io::AsRawSocket;
//! # const MSG_PEEK: i32 = libc::MSG_PEEK;
//! let nread: usize = unsafe {
//! #[cfg(any(unix, target_os = "wasi"))]
//! let raw = sock.as_raw_fd();
//! #[cfg(windows)]
//! let raw = sock.as_raw_socket();
//! match libc::recv(
//! raw as _,
//! buf.as_mut_ptr().cast(),
//! buf.len().try_into().unwrap_or(i32::MAX as _),
//! MSG_PEEK,
//! ) {
//! -1 => return Err(std::io::Error::last_os_error()),
//! nread => nread as usize,
//! }
//! };
//! # let _ = nread;
//! # Ok(())
//! # }
//! ```
//!
//! rustix's APIs perform the following tasks:
//! - Error values are translated to [`Result`]s.
//! - Buffers are passed as Rust slices.
//! - Out-parameters are presented as return values.
//! - Path arguments use [`Arg`], so they accept any string type.
//! - File descriptors are passed and returned via [`AsFd`] and [`OwnedFd`]
//! instead of bare integers, ensuring I/O safety.
//! - Constants use `enum`s and [`bitflags`] types, and enable [support for
//! externally defined flags].
//! - Multiplexed functions (eg. `fcntl`, `ioctl`, etc.) are de-multiplexed.
//! - Variadic functions (eg. `openat`, etc.) are presented as non-variadic.
//! - Functions that return strings automatically allocate sufficient memory
//! and retry the syscall as needed to determine the needed length.
//! - Functions and types which need `l` prefixes or `64` suffixes to enable
//! large-file support (LFS) are used automatically. File sizes and offsets
//! are always presented as `u64` and `i64`.
//! - Behaviors that depend on the sizes of C types like `long` are hidden.
//! - In some places, more human-friendly and less historical-accident names
//! are used (and documentation aliases are used so that the original names
//! can still be searched for).
//! - Provide y2038 compatibility, on platforms which support this.
//! - Correct selected platform bugs, such as behavioral differences when
//! running under seccomp.
//!
//! Things they don't do include:
//! - Detecting whether functions are supported at runtime, except in specific
//! cases where new interfaces need to be detected to support y2038 and LFS.
//! - Hiding significant differences between platforms.
//! - Restricting ambient authorities.
//! - Imposing sandboxing features such as filesystem path or network address
//! sandboxing.
//!
//! See [`cap-std`], [`system-interface`], and [`io-streams`] for libraries
//! which do hide significant differences between platforms, and [`cap-std`]
//! which does perform sandboxing and restricts ambient authorities.
//!
//! [`cap-std`]: https://crates.io/crates/cap-std
//! [`system-interface`]: https://crates.io/crates/system-interface
//! [`io-streams`]: https://crates.io/crates/io-streams
//! [`getrandom`]: https://crates.io/crates/getrandom
//! [`bitflags`]: https://crates.io/crates/bitflags
//! [`AsFd`]: https://doc.rust-lang.org/stable/std/os/fd/trait.AsFd.html
//! [`OwnedFd`]: https://doc.rust-lang.org/stable/std/os/fd/struct.OwnedFd.html
//! [I/O-safe]: https://github.com/rust-lang/rfcs/blob/master/text/3128-io-safety.md
//! [`Result`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html
//! [`Arg`]: https://docs.rs/rustix/*/rustix/path/trait.Arg.html
//! [support for externally defined flags]: https://docs.rs/bitflags/*/bitflags/#externally-defined-flags
#![deny(missing_docs)]
#![allow(stable_features)]
#![cfg_attr(linux_raw, deny(unsafe_code))]
#![cfg_attr(rustc_attrs, feature(rustc_attrs))]
#![cfg_attr(doc_cfg, feature(doc_cfg))]
#![cfg_attr(all(wasi_ext, target_os = "wasi", feature = "std"), feature(wasi_ext))]
#![cfg_attr(core_ffi_c, feature(core_ffi_c))]
#![cfg_attr(core_c_str, feature(core_c_str))]
#![cfg_attr(all(feature = "alloc", alloc_c_string), feature(alloc_c_string))]
#![cfg_attr(all(feature = "alloc", alloc_ffi), feature(alloc_ffi))]
#![cfg_attr(not(feature = "std"), no_std)]
#![cfg_attr(feature = "rustc-dep-of-std", feature(ip))]
#![cfg_attr(feature = "rustc-dep-of-std", allow(internal_features))]
#![cfg_attr(
any(feature = "rustc-dep-of-std", core_intrinsics),
feature(core_intrinsics)
)]
#![cfg_attr(asm_experimental_arch, feature(asm_experimental_arch))]
#![cfg_attr(not(feature = "all-apis"), allow(dead_code))]
// It is common in Linux and libc APIs for types to vary between platforms.
#![allow(clippy::unnecessary_cast)]
// It is common in Linux and libc APIs for types to vary between platforms.
#![allow(clippy::useless_conversion)]
// Redox and WASI have enough differences that it isn't worth precisely
// conditionalizing all the `use`s for them. Similar for if we don't have
// "all-apis".
#![cfg_attr(
any(target_os = "redox", target_os = "wasi", not(feature = "all-apis")),
allow(unused_imports)
)]
#[cfg(all(feature = "alloc", not(feature = "rustc-dep-of-std")))]
extern crate alloc;
// Use `static_assertions` macros if we have them, or a polyfill otherwise.
#[cfg(all(test, static_assertions))]
#[macro_use]
#[allow(unused_imports)]
extern crate static_assertions;
#[cfg(all(test, not(static_assertions)))]
#[macro_use]
#[allow(unused_imports)]
mod static_assertions;
// Internal utilities.
mod buffer;
#[cfg(not(windows))]
#[macro_use]
pub(crate) mod cstr;
#[macro_use]
pub(crate) mod utils;
// Polyfill for `std` in `no_std` builds.
#[cfg_attr(feature = "std", path = "maybe_polyfill/std/mod.rs")]
#[cfg_attr(not(feature = "std"), path = "maybe_polyfill/no_std/mod.rs")]
pub(crate) mod maybe_polyfill;
#[cfg(test)]
#[macro_use]
pub(crate) mod check_types;
#[macro_use]
pub(crate) mod bitcast;
// linux_raw: Weak symbols are used by the use-libc-auxv feature for
// glibc 2.15 support.
//
// libc: Weak symbols are used to call various functions available in some
// versions of libc and not others.
#[cfg(any(
all(linux_raw, feature = "use-libc-auxv"),
all(libc, not(any(windows, target_os = "espidf", target_os = "wasi")))
))]
#[macro_use]
mod weak;
// Pick the backend implementation to use.
#[cfg_attr(libc, path = "backend/libc/mod.rs")]
#[cfg_attr(linux_raw, path = "backend/linux_raw/mod.rs")]
#[cfg_attr(wasi, path = "backend/wasi/mod.rs")]
mod backend;
/// Export the `*Fd` types and traits that are used in rustix's public API.
///
/// Users can use this to avoid needing to import anything else to use the same
/// versions of these types and traits.
pub mod fd {
use super::backend;
// Re-export `AsSocket` etc. too, as users can't implement `AsFd` etc. on
// Windows due to them having blanket impls on Windows, so users must
// implement `AsSocket` etc.
#[cfg(windows)]
pub use backend::fd::{AsRawSocket, AsSocket, FromRawSocket, IntoRawSocket};
pub use backend::fd::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd};
}
// The public API modules.
#[cfg(feature = "event")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "event")))]
pub mod event;
#[cfg(not(windows))]
pub mod ffi;
#[cfg(not(windows))]
#[cfg(feature = "fs")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "fs")))]
pub mod fs;
pub mod io;
#[cfg(linux_kernel)]
#[cfg(feature = "io_uring")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "io_uring")))]
pub mod io_uring;
pub mod ioctl;
#[cfg(not(any(windows, target_os = "espidf", target_os = "vita", target_os = "wasi")))]
#[cfg(feature = "mm")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "mm")))]
pub mod mm;
#[cfg(linux_kernel)]
#[cfg(feature = "mount")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "mount")))]
pub mod mount;
#[cfg(not(any(target_os = "redox", target_os = "wasi")))]
#[cfg(feature = "net")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "net")))]
pub mod net;
#[cfg(not(any(windows, target_os = "espidf")))]
#[cfg(feature = "param")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "param")))]
pub mod param;
#[cfg(not(windows))]
#[cfg(any(feature = "fs", feature = "mount", feature = "net"))]
#[cfg_attr(
doc_cfg,
doc(cfg(any(feature = "fs", feature = "mount", feature = "net")))
)]
pub mod path;
#[cfg(feature = "pipe")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "pipe")))]
#[cfg(not(any(windows, target_os = "wasi")))]
pub mod pipe;
#[cfg(not(windows))]
#[cfg(feature = "process")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "process")))]
pub mod process;
#[cfg(feature = "procfs")]
#[cfg(linux_kernel)]
#[cfg_attr(doc_cfg, doc(cfg(feature = "procfs")))]
pub mod procfs;
#[cfg(not(windows))]
#[cfg(not(target_os = "wasi"))]
#[cfg(feature = "pty")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "pty")))]
pub mod pty;
#[cfg(not(windows))]
#[cfg(feature = "rand")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "rand")))]
pub mod rand;
#[cfg(not(any(
windows,
target_os = "android",
target_os = "espidf",
target_os = "vita",
target_os = "wasi"
)))]
#[cfg(feature = "shm")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "shm")))]
pub mod shm;
#[cfg(not(windows))]
#[cfg(feature = "stdio")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "stdio")))]
pub mod stdio;
#[cfg(feature = "system")]
#[cfg(not(any(windows, target_os = "wasi")))]
#[cfg_attr(doc_cfg, doc(cfg(feature = "system")))]
pub mod system;
#[cfg(not(any(windows, target_os = "vita")))]
#[cfg(feature = "termios")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "termios")))]
pub mod termios;
#[cfg(not(windows))]
#[cfg(feature = "thread")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "thread")))]
pub mod thread;
#[cfg(not(any(windows, target_os = "espidf")))]
#[cfg(feature = "time")]
#[cfg_attr(doc_cfg, doc(cfg(feature = "time")))]
pub mod time;
// "runtime" is also a public API module, but it's only for libc-like users.
#[cfg(not(windows))]
#[cfg(feature = "runtime")]
#[cfg(linux_raw)]
#[cfg_attr(not(document_experimental_runtime_api), doc(hidden))]
#[cfg_attr(doc_cfg, doc(cfg(feature = "runtime")))]
pub mod runtime;
// Temporarily provide some mount functions for use in the fs module for
// backwards compatibility.
#[cfg(linux_kernel)]
#[cfg(all(feature = "fs", not(feature = "mount")))]
pub(crate) mod mount;
// Declare "fs" as a non-public module if "fs" isn't enabled but we need it for
// reading procfs.
#[cfg(not(windows))]
#[cfg(not(feature = "fs"))]
#[cfg(all(
linux_raw,
not(feature = "use-libc-auxv"),
not(feature = "use-explicitly-provided-auxv"),
any(
feature = "param",
feature = "process",
feature = "runtime",
feature = "time",
target_arch = "x86",
)
))]
#[cfg_attr(doc_cfg, doc(cfg(feature = "fs")))]
pub(crate) mod fs;
// Similarly, declare `path` as a non-public module if needed.
#[cfg(not(windows))]
#[cfg(not(any(feature = "fs", feature = "mount", feature = "net")))]
#[cfg(all(
linux_raw,
not(feature = "use-libc-auxv"),
not(feature = "use-explicitly-provided-auxv"),
any(
feature = "param",
feature = "process",
feature = "runtime",
feature = "time",
target_arch = "x86",
)
))]
pub(crate) mod path;
// Private modules used by multiple public modules.
#[cfg(not(any(windows, target_os = "espidf")))]
#[cfg(any(feature = "thread", feature = "time", target_arch = "x86"))]
mod clockid;
#[cfg(not(any(windows, target_os = "wasi")))]
#[cfg(any(
feature = "procfs",
feature = "process",
feature = "runtime",
feature = "termios",
feature = "thread",
all(bsd, feature = "event"),
all(linux_kernel, feature = "net")
))]
mod pid;
#[cfg(any(feature = "process", feature = "thread"))]
#[cfg(linux_kernel)]
mod prctl;
#[cfg(not(any(windows, target_os = "espidf", target_os = "wasi")))]
#[cfg(any(feature = "process", feature = "runtime", all(bsd, feature = "event")))]
mod signal;
#[cfg(not(windows))]
#[cfg(any(
feature = "fs",
feature = "process",
feature = "runtime",
feature = "thread",
feature = "time",
all(
linux_raw,
not(feature = "use-libc-auxv"),
not(feature = "use-explicitly-provided-auxv"),
any(
feature = "param",
feature = "process",
feature = "runtime",
feature = "time",
target_arch = "x86",
)
)
))]
mod timespec;
#[cfg(not(any(windows, target_os = "wasi")))]
#[cfg(any(
feature = "fs",
feature = "process",
feature = "thread",
all(
linux_raw,
not(feature = "use-libc-auxv"),
not(feature = "use-explicitly-provided-auxv"),
any(
feature = "param",
feature = "runtime",
feature = "time",
target_arch = "x86",
)
),
all(linux_kernel, feature = "net")
))]
mod ugid;
|
