| 1 | //! `rustix` provides efficient memory-safe and [I/O-safe] wrappers to |
| 2 | //! POSIX-like, Unix-like, Linux, and Winsock2 syscall-like APIs, with |
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| 3 | //! configurable backends. |
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| 4 | //! |
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| 5 | //! With rustix, you can write code like this: |
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| 6 | //! |
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| 7 | //! ``` |
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| 8 | //! # #[cfg (feature = "net" )] |
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| 9 | //! # fn read(sock: std::net::TcpStream, buf: &mut [u8]) -> std::io::Result<()> { |
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| 10 | //! # use rustix::net::RecvFlags; |
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| 11 | //! let nread: usize = rustix::net::recv(&sock, buf, RecvFlags::PEEK)?; |
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| 12 | //! # let _ = nread; |
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| 13 | //! # Ok(()) |
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| 14 | //! # } |
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| 15 | //! ``` |
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| 16 | //! |
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| 17 | //! instead of like this: |
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| 18 | //! |
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| 19 | //! ``` |
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| 20 | //! # #[cfg (feature = "net" )] |
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| 21 | //! # fn read(sock: std::net::TcpStream, buf: &mut [u8]) -> std::io::Result<()> { |
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| 22 | //! # #[cfg (unix)] |
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| 23 | //! # use std::os::unix::io::AsRawFd; |
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| 24 | //! # #[cfg (target_os = "wasi" )] |
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| 25 | //! # use std::os::wasi::io::AsRawFd; |
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| 26 | //! # #[cfg (windows)] |
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| 27 | //! # use windows_sys::Win32::Networking::WinSock as libc; |
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| 28 | //! # #[cfg (windows)] |
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| 29 | //! # use std::os::windows::io::AsRawSocket; |
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| 30 | //! # const MSG_PEEK: i32 = libc::MSG_PEEK; |
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| 31 | //! let nread: usize = unsafe { |
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| 32 | //! #[cfg (any(unix, target_os = "wasi" ))] |
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| 33 | //! let raw = sock.as_raw_fd(); |
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| 34 | //! #[cfg (windows)] |
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| 35 | //! let raw = sock.as_raw_socket(); |
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| 36 | //! match libc::recv( |
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| 37 | //! raw as _, |
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| 38 | //! buf.as_mut_ptr().cast(), |
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| 39 | //! buf.len().try_into().unwrap_or(i32::MAX as _), |
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| 40 | //! MSG_PEEK, |
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| 41 | //! ) { |
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| 42 | //! -1 => return Err(std::io::Error::last_os_error()), |
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| 43 | //! nread => nread as usize, |
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| 44 | //! } |
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| 45 | //! }; |
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| 46 | //! # let _ = nread; |
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| 47 | //! # Ok(()) |
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| 48 | //! # } |
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| 49 | //! ``` |
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| 50 | //! |
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| 51 | //! rustix's APIs perform the following tasks: |
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| 52 | //! - Error values are translated to [`Result`]s. |
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| 53 | //! - Buffers are passed as Rust slices. |
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| 54 | //! - Out-parameters are presented as return values. |
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| 55 | //! - Path arguments use [`Arg`], so they accept any string type. |
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| 56 | //! - File descriptors are passed and returned via [`AsFd`] and [`OwnedFd`] |
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| 57 | //! instead of bare integers, ensuring I/O safety. |
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| 58 | //! - Constants use `enum`s and [`bitflags`] types, and enable [support for |
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| 59 | //! externally defined flags]. |
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| 60 | //! - Multiplexed functions (eg. `fcntl`, `ioctl`, etc.) are de-multiplexed. |
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| 61 | //! - Variadic functions (eg. `openat`, etc.) are presented as non-variadic. |
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| 62 | //! - Functions that return strings automatically allocate sufficient memory |
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| 63 | //! and retry the syscall as needed to determine the needed length. |
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| 64 | //! - Functions and types which need `l` prefixes or `64` suffixes to enable |
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| 65 | //! large-file support (LFS) are used automatically. File sizes and offsets |
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| 66 | //! are always presented as `u64` and `i64`. |
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| 67 | //! - Behaviors that depend on the sizes of C types like `long` are hidden. |
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| 68 | //! - In some places, more human-friendly and less historical-accident names |
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| 69 | //! are used (and documentation aliases are used so that the original names |
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| 70 | //! can still be searched for). |
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| 71 | //! - Provide y2038 compatibility, on platforms which support this. |
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| 72 | //! - Correct selected platform bugs, such as behavioral differences when |
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| 73 | //! running under seccomp. |
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| 74 | //! |
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| 75 | //! Things they don't do include: |
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| 76 | //! - Detecting whether functions are supported at runtime, except in specific |
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| 77 | //! cases where new interfaces need to be detected to support y2038 and LFS. |
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| 78 | //! - Hiding significant differences between platforms. |
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| 79 | //! - Restricting ambient authorities. |
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| 80 | //! - Imposing sandboxing features such as filesystem path or network address |
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| 81 | //! sandboxing. |
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| 82 | //! |
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| 83 | //! See [`cap-std`], [`system-interface`], and [`io-streams`] for libraries |
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| 84 | //! which do hide significant differences between platforms, and [`cap-std`] |
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| 85 | //! which does perform sandboxing and restricts ambient authorities. |
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| 86 | //! |
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| 87 | //! [`cap-std`]: https://crates.io/crates/cap-std |
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| 88 | //! [`system-interface`]: https://crates.io/crates/system-interface |
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| 89 | //! [`io-streams`]: https://crates.io/crates/io-streams |
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| 90 | //! [`getrandom`]: https://crates.io/crates/getrandom |
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| 91 | //! [`bitflags`]: https://crates.io/crates/bitflags |
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| 92 | //! [`AsFd`]: https://doc.rust-lang.org/stable/std/os/fd/trait.AsFd.html |
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| 93 | //! [`OwnedFd`]: https://doc.rust-lang.org/stable/std/os/fd/struct.OwnedFd.html |
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| 94 | //! [I/O-safe]: https://github.com/rust-lang/rfcs/blob/master/text/3128-io-safety.md |
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| 95 | //! [`Result`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html |
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| 96 | //! [`Arg`]: https://docs.rs/rustix/*/rustix/path/trait.Arg.html |
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| 97 | //! [support for externally defined flags]: https://docs.rs/bitflags/latest/bitflags/#externally-defined-flags |
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| 98 | |
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| 99 | #![deny (missing_docs)] |
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| 100 | #![allow (stable_features)] |
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| 101 | #![cfg_attr (linux_raw, deny(unsafe_code))] |
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| 102 | #![cfg_attr (rustc_attrs, feature(rustc_attrs))] |
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| 103 | #![cfg_attr (doc_cfg, feature(doc_cfg))] |
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| 104 | #![cfg_attr (all(wasi_ext, target_os = "wasi" , feature = "std" ), feature(wasi_ext))] |
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| 105 | #![cfg_attr (core_ffi_c, feature(core_ffi_c))] |
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| 106 | #![cfg_attr (core_c_str, feature(core_c_str))] |
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| 107 | #![cfg_attr (all(feature = "alloc" , alloc_c_string), feature(alloc_c_string))] |
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| 108 | #![cfg_attr (all(feature = "alloc" , alloc_ffi), feature(alloc_ffi))] |
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| 109 | #![cfg_attr (not(feature = "std" ), no_std)] |
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| 110 | #![cfg_attr (feature = "rustc-dep-of-std" , feature(ip))] |
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| 111 | #![cfg_attr (feature = "rustc-dep-of-std" , allow(internal_features))] |
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| 112 | #![cfg_attr ( |
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| 113 | any(feature = "rustc-dep-of-std" , core_intrinsics), |
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| 114 | feature(core_intrinsics) |
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| 115 | )] |
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| 116 | #![cfg_attr (asm_experimental_arch, feature(asm_experimental_arch))] |
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| 117 | #![cfg_attr (not(feature = "all-apis" ), allow(dead_code))] |
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| 118 | // It is common in linux and libc APIs for types to vary between platforms. |
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| 119 | #![allow (clippy::unnecessary_cast)] |
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| 120 | // It is common in linux and libc APIs for types to vary between platforms. |
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| 121 | #![allow (clippy::useless_conversion)] |
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| 122 | // Redox and WASI have enough differences that it isn't worth precisely |
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| 123 | // conditionalizing all the `use`s for them. |
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| 124 | #![cfg_attr (any(target_os = "redox" , target_os = "wasi" ), allow(unused_imports))] |
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| 125 | |
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| 126 | #[cfg (all(feature = "alloc" , not(feature = "rustc-dep-of-std" )))] |
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| 127 | extern crate alloc; |
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| 128 | |
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| 129 | // Use `static_assertions` macros if we have them, or a polyfill otherwise. |
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| 130 | #[cfg (all(test, static_assertions))] |
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| 131 | #[macro_use ] |
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| 132 | #[allow (unused_imports)] |
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| 133 | extern crate static_assertions; |
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| 134 | #[cfg (all(test, not(static_assertions)))] |
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| 135 | #[macro_use ] |
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| 136 | #[allow (unused_imports)] |
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| 137 | mod static_assertions; |
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| 138 | |
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| 139 | // Internal utilities. |
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| 140 | #[cfg (not(windows))] |
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| 141 | #[macro_use ] |
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| 142 | pub(crate) mod cstr; |
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| 143 | #[macro_use ] |
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| 144 | pub(crate) mod utils; |
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| 145 | // Polyfill for `std` in `no_std` builds. |
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| 146 | #[cfg_attr (feature = "std" , path = "maybe_polyfill/std/mod.rs" )] |
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| 147 | #[cfg_attr (not(feature = "std" ), path = "maybe_polyfill/no_std/mod.rs" )] |
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| 148 | pub(crate) mod maybe_polyfill; |
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| 149 | #[cfg (test)] |
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| 150 | #[macro_use ] |
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| 151 | pub(crate) mod check_types; |
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| 152 | #[macro_use ] |
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| 153 | pub(crate) mod bitcast; |
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| 154 | |
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| 155 | // linux_raw: Weak symbols are used by the use-libc-auxv feature for |
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| 156 | // glibc 2.15 support. |
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| 157 | // |
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| 158 | // libc: Weak symbols are used to call various functions available in some |
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| 159 | // versions of libc and not others. |
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| 160 | #[cfg (any( |
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| 161 | all(linux_raw, feature = "use-libc-auxv" ), |
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| 162 | all(libc, not(any(windows, target_os = "espidf" , target_os = "wasi" ))) |
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| 163 | ))] |
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| 164 | #[macro_use ] |
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| 165 | mod weak; |
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| 166 | |
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| 167 | // Pick the backend implementation to use. |
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| 168 | #[cfg_attr (libc, path = "backend/libc/mod.rs" )] |
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| 169 | #[cfg_attr (linux_raw, path = "backend/linux_raw/mod.rs" )] |
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| 170 | #[cfg_attr (wasi, path = "backend/wasi/mod.rs" )] |
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| 171 | mod backend; |
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| 172 | |
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| 173 | /// Export the `*Fd` types and traits that are used in rustix's public API. |
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| 174 | /// |
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| 175 | /// Users can use this to avoid needing to import anything else to use the same |
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| 176 | /// versions of these types and traits. |
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| 177 | pub mod fd { |
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| 178 | use super::backend; |
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| 179 | |
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| 180 | // Re-export `AsSocket` etc. too, as users can't implement `AsFd` etc. on |
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| 181 | // Windows due to them having blanket impls on Windows, so users must |
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| 182 | // implement `AsSocket` etc. |
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| 183 | #[cfg (windows)] |
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| 184 | pub use backend::fd::{AsRawSocket, AsSocket, FromRawSocket, IntoRawSocket}; |
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| 185 | |
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| 186 | pub use backend::fd::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd}; |
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| 187 | } |
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| 188 | |
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| 189 | // The public API modules. |
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| 190 | #[cfg (feature = "event" )] |
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| 191 | #[cfg_attr (doc_cfg, doc(cfg(feature = "event" )))] |
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| 192 | pub mod event; |
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| 193 | #[cfg (not(windows))] |
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| 194 | pub mod ffi; |
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| 195 | #[cfg (not(windows))] |
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| 196 | #[cfg (feature = "fs" )] |
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| 197 | #[cfg_attr (doc_cfg, doc(cfg(feature = "fs" )))] |
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| 198 | pub mod fs; |
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| 199 | pub mod io; |
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| 200 | #[cfg (linux_kernel)] |
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| 201 | #[cfg (feature = "io_uring" )] |
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| 202 | #[cfg_attr (doc_cfg, doc(cfg(feature = "io_uring" )))] |
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| 203 | pub mod io_uring; |
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| 204 | pub mod ioctl; |
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| 205 | #[cfg (not(any(windows, target_os = "espidf" , target_os = "wasi" )))] |
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| 206 | #[cfg (feature = "mm" )] |
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| 207 | #[cfg_attr (doc_cfg, doc(cfg(feature = "mm" )))] |
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| 208 | pub mod mm; |
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| 209 | #[cfg (linux_kernel)] |
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| 210 | #[cfg (feature = "mount" )] |
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| 211 | #[cfg_attr (doc_cfg, doc(cfg(feature = "mount" )))] |
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| 212 | pub mod mount; |
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| 213 | #[cfg (not(any(target_os = "redox" , target_os = "wasi" )))] |
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| 214 | #[cfg (feature = "net" )] |
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| 215 | #[cfg_attr (doc_cfg, doc(cfg(feature = "net" )))] |
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| 216 | pub mod net; |
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| 217 | #[cfg (not(any(windows, target_os = "espidf" )))] |
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| 218 | #[cfg (feature = "param" )] |
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| 219 | #[cfg_attr (doc_cfg, doc(cfg(feature = "param" )))] |
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| 220 | pub mod param; |
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| 221 | #[cfg (not(windows))] |
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| 222 | #[cfg (any(feature = "fs" , feature = "mount" , feature = "net" ))] |
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| 223 | #[cfg_attr ( |
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| 224 | doc_cfg, |
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| 225 | doc(cfg(any(feature = "fs" , feature = "mount" , feature = "net" ))) |
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| 226 | )] |
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| 227 | pub mod path; |
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| 228 | #[cfg (feature = "pipe" )] |
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| 229 | #[cfg_attr (doc_cfg, doc(cfg(feature = "pipe" )))] |
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| 230 | #[cfg (not(any(windows, target_os = "wasi" )))] |
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| 231 | pub mod pipe; |
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| 232 | #[cfg (not(windows))] |
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| 233 | #[cfg (feature = "process" )] |
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| 234 | #[cfg_attr (doc_cfg, doc(cfg(feature = "process" )))] |
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| 235 | pub mod process; |
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| 236 | #[cfg (feature = "procfs" )] |
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| 237 | #[cfg (linux_kernel)] |
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| 238 | #[cfg_attr (doc_cfg, doc(cfg(feature = "procfs" )))] |
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| 239 | pub mod procfs; |
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| 240 | #[cfg (not(windows))] |
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| 241 | #[cfg (not(target_os = "wasi" ))] |
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| 242 | #[cfg (feature = "pty" )] |
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| 243 | #[cfg_attr (doc_cfg, doc(cfg(feature = "pty" )))] |
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| 244 | pub mod pty; |
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| 245 | #[cfg (not(windows))] |
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| 246 | #[cfg (feature = "rand" )] |
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| 247 | #[cfg_attr (doc_cfg, doc(cfg(feature = "rand" )))] |
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| 248 | pub mod rand; |
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| 249 | #[cfg (not(any( |
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| 250 | windows, |
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| 251 | target_os = "android" , |
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| 252 | target_os = "espidf" , |
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| 253 | target_os = "wasi" |
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| 254 | )))] |
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| 255 | #[cfg (feature = "shm" )] |
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| 256 | #[cfg_attr (doc_cfg, doc(cfg(feature = "shm" )))] |
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| 257 | pub mod shm; |
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| 258 | #[cfg (not(windows))] |
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| 259 | #[cfg (feature = "stdio" )] |
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| 260 | #[cfg_attr (doc_cfg, doc(cfg(feature = "stdio" )))] |
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| 261 | pub mod stdio; |
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| 262 | #[cfg (feature = "system" )] |
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| 263 | #[cfg (not(any(windows, target_os = "wasi" )))] |
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| 264 | #[cfg_attr (doc_cfg, doc(cfg(feature = "system" )))] |
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| 265 | pub mod system; |
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| 266 | #[cfg (not(windows))] |
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| 267 | #[cfg (feature = "termios" )] |
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| 268 | #[cfg_attr (doc_cfg, doc(cfg(feature = "termios" )))] |
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| 269 | pub mod termios; |
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| 270 | #[cfg (not(windows))] |
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| 271 | #[cfg (feature = "thread" )] |
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| 272 | #[cfg_attr (doc_cfg, doc(cfg(feature = "thread" )))] |
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| 273 | pub mod thread; |
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| 274 | #[cfg (not(any(windows, target_os = "espidf" )))] |
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| 275 | #[cfg (feature = "time" )] |
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| 276 | #[cfg_attr (doc_cfg, doc(cfg(feature = "time" )))] |
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| 277 | pub mod time; |
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| 278 | |
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| 279 | // "runtime" is also a public API module, but it's only for libc-like users. |
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| 280 | #[cfg (not(windows))] |
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| 281 | #[cfg (feature = "runtime" )] |
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| 282 | #[cfg (linux_raw)] |
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| 283 | #[cfg_attr (not(document_experimental_runtime_api), doc(hidden))] |
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| 284 | #[cfg_attr (doc_cfg, doc(cfg(feature = "runtime" )))] |
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| 285 | pub mod runtime; |
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| 286 | |
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| 287 | // Temporarily provide some mount functions for use in the fs module for |
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| 288 | // backwards compatibility. |
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| 289 | #[cfg (linux_kernel)] |
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| 290 | #[cfg (all(feature = "fs" , not(feature = "mount" )))] |
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| 291 | pub(crate) mod mount; |
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| 292 | |
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| 293 | // Declare "fs" as a non-public module if "fs" isn't enabled but we need it for |
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| 294 | // reading procfs. |
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| 295 | #[cfg (not(windows))] |
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| 296 | #[cfg (not(feature = "fs" ))] |
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| 297 | #[cfg (all( |
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| 298 | linux_raw, |
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| 299 | not(feature = "use-libc-auxv" ), |
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| 300 | not(feature = "use-explicitly-provided-auxv" ), |
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| 301 | any( |
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| 302 | feature = "param" , |
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| 303 | feature = "runtime" , |
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| 304 | feature = "time" , |
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| 305 | target_arch = "x86" , |
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| 306 | ) |
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| 307 | ))] |
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| 308 | #[cfg_attr (doc_cfg, doc(cfg(feature = "fs" )))] |
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| 309 | pub(crate) mod fs; |
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| 310 | |
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| 311 | // Similarly, declare `path` as a non-public module if needed. |
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| 312 | #[cfg (not(windows))] |
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| 313 | #[cfg (not(any(feature = "fs" , feature = "mount" , feature = "net" )))] |
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| 314 | #[cfg (all( |
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| 315 | linux_raw, |
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| 316 | not(feature = "use-libc-auxv" ), |
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| 317 | not(feature = "use-explicitly-provided-auxv" ), |
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| 318 | any( |
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| 319 | feature = "param" , |
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| 320 | feature = "runtime" , |
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| 321 | feature = "time" , |
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| 322 | target_arch = "x86" , |
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| 323 | ) |
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| 324 | ))] |
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| 325 | pub(crate) mod path; |
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| 326 | |
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| 327 | // Private modules used by multiple public modules. |
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| 328 | #[cfg (not(any(windows, target_os = "espidf" )))] |
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| 329 | #[cfg (any(feature = "thread" , feature = "time" , target_arch = "x86" ))] |
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| 330 | mod clockid; |
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| 331 | #[cfg (not(any(windows, target_os = "wasi" )))] |
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| 332 | #[cfg (any( |
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| 333 | feature = "procfs" , |
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| 334 | feature = "process" , |
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| 335 | feature = "runtime" , |
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| 336 | feature = "termios" , |
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| 337 | feature = "thread" , |
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| 338 | all(bsd, feature = "event" ), |
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| 339 | all(linux_kernel, feature = "net" ) |
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| 340 | ))] |
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| 341 | mod pid; |
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| 342 | #[cfg (any(feature = "process" , feature = "thread" ))] |
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| 343 | #[cfg (linux_kernel)] |
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| 344 | mod prctl; |
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| 345 | #[cfg (not(any(windows, target_os = "espidf" , target_os = "wasi" )))] |
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| 346 | #[cfg (any(feature = "process" , feature = "runtime" , all(bsd, feature = "event" )))] |
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| 347 | mod signal; |
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| 348 | #[cfg (not(windows))] |
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| 349 | #[cfg (any( |
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| 350 | feature = "fs" , |
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| 351 | feature = "runtime" , |
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| 352 | feature = "thread" , |
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| 353 | feature = "time" , |
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| 354 | all( |
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| 355 | linux_raw, |
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| 356 | not(feature = "use-libc-auxv" ), |
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| 357 | not(feature = "use-explicitly-provided-auxv" ), |
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| 358 | any( |
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| 359 | feature = "param" , |
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| 360 | feature = "runtime" , |
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| 361 | feature = "time" , |
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| 362 | target_arch = "x86" , |
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| 363 | ) |
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| 364 | ) |
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| 365 | ))] |
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| 366 | mod timespec; |
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| 367 | #[cfg (not(any(windows, target_os = "wasi" )))] |
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| 368 | #[cfg (any( |
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| 369 | feature = "fs" , |
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| 370 | feature = "process" , |
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| 371 | feature = "thread" , |
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| 372 | all( |
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| 373 | linux_raw, |
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| 374 | not(feature = "use-libc-auxv" ), |
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| 375 | not(feature = "use-explicitly-provided-auxv" ), |
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| 376 | any( |
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| 377 | feature = "param" , |
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| 378 | feature = "runtime" , |
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| 379 | feature = "time" , |
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| 380 | target_arch = "x86" , |
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| 381 | ) |
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| 382 | ), |
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| 383 | all(linux_kernel, feature = "net" ) |
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| 384 | ))] |
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| 385 | mod ugid; |
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| 386 | |
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