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| author | garhve <git@garhve.com> | 2022-12-20 11:04:25 +0800 |
|---|---|---|
| committer | garhve <git@garhve.com> | 2022-12-20 11:04:25 +0800 |
| commit | 369d11587339ce74f8ebc76f2607fe55545eaf7d (patch) | |
| tree | 4b25c6f7e3aca08a90b25950f4f8e4430c4294bc /rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/getrandom/lib.rs.html | |
| parent | 0f1b6d015243e55a38b1c1b7e8af66668e4e794d (diff) | |
Build small project following the book
Diffstat (limited to 'rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/getrandom/lib.rs.html')
| -rw-r--r-- | rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/getrandom/lib.rs.html | 585 |
1 files changed, 585 insertions, 0 deletions
diff --git a/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/getrandom/lib.rs.html b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/getrandom/lib.rs.html new file mode 100644 index 0000000..1ee8d19 --- /dev/null +++ b/rust/theBook/chapter-2-guessing-game/guessing_game/target/doc/src/getrandom/lib.rs.html @@ -0,0 +1,585 @@ +<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/pico/.local/share/cargo/registry/src/github.com-1ecc6299db9ec823/getrandom-0.2.8/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" 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href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../getrandom/index.html"> + <img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre 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your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +</span><span class="doccomment">//! Interface to the operating system's random number generator. +//! +//! # Supported targets +//! +//! | Target | Target Triple | Implementation +//! | ----------------- | ------------------ | -------------- +//! | Linux, Android | `*‑linux‑*` | [`getrandom`][1] system call if available, otherwise [`/dev/urandom`][2] after successfully polling `/dev/random` +//! | Windows | `*‑windows‑*` | [`BCryptGenRandom`] +//! | macOS | `*‑apple‑darwin` | [`getentropy`][3] if available, otherwise [`/dev/random`][4] (identical to `/dev/urandom`) +//! | iOS | `*‑apple‑ios` | [`SecRandomCopyBytes`] +//! | FreeBSD | `*‑freebsd` | [`getrandom`][5] if available, otherwise [`kern.arandom`][6] +//! | OpenBSD | `*‑openbsd` | [`getentropy`][7] +//! | NetBSD | `*‑netbsd` | [`kern.arandom`][8] +//! | Dragonfly BSD | `*‑dragonfly` | [`getrandom`][9] if available, otherwise [`/dev/random`][10] +//! | Solaris, illumos | `*‑solaris`, `*‑illumos` | [`getrandom`][11] if available, otherwise [`/dev/random`][12] +//! | Fuchsia OS | `*‑fuchsia` | [`cprng_draw`] +//! | Redox | `*‑redox` | `/dev/urandom` +//! | Haiku | `*‑haiku` | `/dev/random` (identical to `/dev/urandom`) +//! | Hermit | `x86_64-*-hermit` | [`RDRAND`] +//! | SGX | `x86_64‑*‑sgx` | [`RDRAND`] +//! | VxWorks | `*‑wrs‑vxworks‑*` | `randABytes` after checking entropy pool initialization with `randSecure` +//! | ESP-IDF | `*‑espidf` | [`esp_fill_random`] +//! | Emscripten | `*‑emscripten` | `/dev/random` (identical to `/dev/urandom`) +//! | WASI | `wasm32‑wasi` | [`random_get`] +//! | Web Browser and Node.js | `wasm32‑*‑unknown` | [`Crypto.getRandomValues`] if available, then [`crypto.randomFillSync`] if on Node.js, see [WebAssembly support] +//! | SOLID | `*-kmc-solid_*` | `SOLID_RNG_SampleRandomBytes` +//! | Nintendo 3DS | `armv6k-nintendo-3ds` | [`getrandom`][1] +//! +//! There is no blanket implementation on `unix` targets that reads from +//! `/dev/urandom`. This ensures all supported targets are using the recommended +//! interface and respect maximum buffer sizes. +//! +//! Pull Requests that add support for new targets to `getrandom` are always welcome. +//! +//! ## Unsupported targets +//! +//! By default, `getrandom` will not compile on unsupported targets, but certain +//! features allow a user to select a "fallback" implementation if no supported +//! implementation exists. +//! +//! All of the below mechanisms only affect unsupported +//! targets. Supported targets will _always_ use their supported implementations. +//! This prevents a crate from overriding a secure source of randomness +//! (either accidentally or intentionally). +//! +//! ### RDRAND on x86 +//! +//! *If the `rdrand` Cargo feature is enabled*, `getrandom` will fallback to using +//! the [`RDRAND`] instruction to get randomness on `no_std` `x86`/`x86_64` +//! targets. This feature has no effect on other CPU architectures. +//! +//! ### WebAssembly support +//! +//! This crate fully supports the +//! [`wasm32-wasi`](https://github.com/CraneStation/wasi) and +//! [`wasm32-unknown-emscripten`](https://www.hellorust.com/setup/emscripten/) +//! targets. However, the `wasm32-unknown-unknown` target (i.e. the target used +//! by `wasm-pack`) is not automatically +//! supported since, from the target name alone, we cannot deduce which +//! JavaScript interface is in use (or if JavaScript is available at all). +//! +//! Instead, *if the `js` Cargo feature is enabled*, this crate will assume +//! that you are building for an environment containing JavaScript, and will +//! call the appropriate methods. Both web browser (main window and Web Workers) +//! and Node.js environments are supported, invoking the methods +//! [described above](#supported-targets) using the [`wasm-bindgen`] toolchain. +//! +//! To enable the `js` Cargo feature, add the following to the `dependencies` +//! section in your `Cargo.toml` file: +//! ```toml +//! [dependencies] +//! getrandom = { version = "0.2", features = ["js"] } +//! ``` +//! +//! This can be done even if `getrandom` is not a direct dependency. Cargo +//! allows crates to enable features for indirect dependencies. +//! +//! This feature should only be enabled for binary, test, or benchmark crates. +//! Library crates should generally not enable this feature, leaving such a +//! decision to *users* of their library. Also, libraries should not introduce +//! their own `js` features *just* to enable `getrandom`'s `js` feature. +//! +//! This feature has no effect on targets other than `wasm32-unknown-unknown`. +//! +//! #### Node.js ES module support +//! +//! Node.js supports both [CommonJS modules] and [ES modules]. Due to +//! limitations in wasm-bindgen's [`module`] support, we cannot directly +//! support ES Modules running on Node.js. However, on Node v15 and later, the +//! module author can add a simple shim to support the Web Cryptography API: +//! ```js +//! import { webcrypto } from 'node:crypto' +//! globalThis.crypto = webcrypto +//! ``` +//! This crate will then use the provided `webcrypto` implementation. +//! +//! ### Custom implementations +//! +//! The [`register_custom_getrandom!`] macro allows a user to mark their own +//! function as the backing implementation for [`getrandom`]. See the macro's +//! documentation for more information about writing and registering your own +//! custom implementations. +//! +//! Note that registering a custom implementation only has an effect on targets +//! that would otherwise not compile. Any supported targets (including those +//! using `rdrand` and `js` Cargo features) continue using their normal +//! implementations even if a function is registered. +//! +//! ## Early boot +//! +//! Sometimes, early in the boot process, the OS has not collected enough +//! entropy to securely seed its RNG. This is especially common on virtual +//! machines, where standard "random" events are hard to come by. +//! +//! Some operating system interfaces always block until the RNG is securely +//! seeded. This can take anywhere from a few seconds to more than a minute. +//! A few (Linux, NetBSD and Solaris) offer a choice between blocking and +//! getting an error; in these cases, we always choose to block. +//! +//! On Linux (when the `getrandom` system call is not available), reading from +//! `/dev/urandom` never blocks, even when the OS hasn't collected enough +//! entropy yet. To avoid returning low-entropy bytes, we first poll +//! `/dev/random` and only switch to `/dev/urandom` once this has succeeded. +//! +//! On OpenBSD, this kind of entropy accounting isn't available, and on +//! NetBSD, blocking on it is discouraged. On these platforms, nonblocking +//! interfaces are used, even when reliable entropy may not be available. +//! On the platforms where it is used, the reliability of entropy accounting +//! itself isn't free from controversy. This library provides randomness +//! sourced according to the platform's best practices, but each platform has +//! its own limits on the grade of randomness it can promise in environments +//! with few sources of entropy. +//! +//! ## Error handling +//! +//! We always choose failure over returning known insecure "random" bytes. In +//! general, on supported platforms, failure is highly unlikely, though not +//! impossible. If an error does occur, then it is likely that it will occur +//! on every call to `getrandom`, hence after the first successful call one +//! can be reasonably confident that no errors will occur. +//! +//! [1]: http://man7.org/linux/man-pages/man2/getrandom.2.html +//! [2]: http://man7.org/linux/man-pages/man4/urandom.4.html +//! [3]: https://www.unix.com/man-page/mojave/2/getentropy/ +//! [4]: https://www.unix.com/man-page/mojave/4/random/ +//! [5]: https://www.freebsd.org/cgi/man.cgi?query=getrandom&manpath=FreeBSD+12.0-stable +//! [6]: https://www.freebsd.org/cgi/man.cgi?query=random&sektion=4 +//! [7]: https://man.openbsd.org/getentropy.2 +//! [8]: https://man.netbsd.org/sysctl.7 +//! [9]: https://leaf.dragonflybsd.org/cgi/web-man?command=getrandom +//! [10]: https://leaf.dragonflybsd.org/cgi/web-man?command=random&section=4 +//! [11]: https://docs.oracle.com/cd/E88353_01/html/E37841/getrandom-2.html +//! [12]: https://docs.oracle.com/cd/E86824_01/html/E54777/random-7d.html +//! +//! [`BCryptGenRandom`]: https://docs.microsoft.com/en-us/windows/win32/api/bcrypt/nf-bcrypt-bcryptgenrandom +//! [`Crypto.getRandomValues`]: https://www.w3.org/TR/WebCryptoAPI/#Crypto-method-getRandomValues +//! [`RDRAND`]: https://software.intel.com/en-us/articles/intel-digital-random-number-generator-drng-software-implementation-guide +//! [`SecRandomCopyBytes`]: https://developer.apple.com/documentation/security/1399291-secrandomcopybytes?language=objc +//! [`cprng_draw`]: https://fuchsia.dev/fuchsia-src/zircon/syscalls/cprng_draw +//! [`crypto.randomFillSync`]: https://nodejs.org/api/crypto.html#cryptorandomfillsyncbuffer-offset-size +//! [`esp_fill_random`]: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/random.html#_CPPv415esp_fill_randomPv6size_t +//! [`random_get`]: https://github.com/WebAssembly/WASI/blob/main/phases/snapshot/docs.md#-random_getbuf-pointeru8-buf_len-size---errno +//! [WebAssembly support]: #webassembly-support +//! [`wasm-bindgen`]: https://github.com/rustwasm/wasm-bindgen +//! [`module`]: https://rustwasm.github.io/wasm-bindgen/reference/attributes/on-js-imports/module.html +//! [CommonJS modules]: https://nodejs.org/api/modules.html +//! [ES modules]: https://nodejs.org/api/esm.html + +</span><span class="attribute">#![doc( + html_logo_url = <span class="string">"https://www.rust-lang.org/logos/rust-logo-128x128-blk.png"</span>, + html_favicon_url = <span class="string">"https://www.rust-lang.org/favicon.ico"</span>, + html_root_url = <span class="string">"https://docs.rs/getrandom/0.2.8" +</span>)] +#![no_std] +#![warn(rust_2018_idioms, unused_lifetimes, missing_docs)] +#![cfg_attr(docsrs, feature(doc_cfg))] + +#[macro_use] +</span><span class="kw">extern crate </span>cfg_if; + +<span class="kw">mod </span>error; +<span class="kw">mod </span>util; +<span class="comment">// To prevent a breaking change when targets are added, we always export the +// register_custom_getrandom macro, so old Custom RNG crates continue to build. +</span><span class="attribute">#[cfg(feature = <span class="string">"custom"</span>)] +</span><span class="kw">mod </span>custom; +<span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] +</span><span class="kw">mod </span>error_impls; + +<span class="kw">pub use </span><span class="kw">crate</span>::error::Error; + +<span class="comment">// System-specific implementations. +// +// These should all provide getrandom_inner with the same signature as getrandom. +</span><span class="macro">cfg_if! </span>{ + <span class="kw">if </span><span class="attribute">#[cfg(any(target_os = <span class="string">"emscripten"</span>, target_os = <span class="string">"haiku"</span>, + target_os = <span class="string">"redox"</span>))] </span>{ + <span class="kw">mod </span>util_libc; + <span class="attribute">#[path = <span class="string">"use_file.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(any(target_os = <span class="string">"android"</span>, target_os = <span class="string">"linux"</span>))] </span>{ + <span class="kw">mod </span>util_libc; + <span class="kw">mod </span>use_file; + <span class="attribute">#[path = <span class="string">"linux_android.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(any(target_os = <span class="string">"illumos"</span>, target_os = <span class="string">"solaris"</span>))] </span>{ + <span class="kw">mod </span>util_libc; + <span class="kw">mod </span>use_file; + <span class="attribute">#[path = <span class="string">"solaris_illumos.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(any(target_os = <span class="string">"freebsd"</span>, target_os = <span class="string">"netbsd"</span>))] </span>{ + <span class="kw">mod </span>util_libc; + <span class="attribute">#[path = <span class="string">"bsd_arandom.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(target_os = <span class="string">"dragonfly"</span>)] </span>{ + <span class="kw">mod </span>util_libc; + <span class="kw">mod </span>use_file; + <span class="attribute">#[path = <span class="string">"dragonfly.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(target_os = <span class="string">"fuchsia"</span>)] </span>{ + <span class="attribute">#[path = <span class="string">"fuchsia.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(target_os = <span class="string">"ios"</span>)] </span>{ + <span class="attribute">#[path = <span class="string">"ios.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(target_os = <span class="string">"macos"</span>)] </span>{ + <span class="kw">mod </span>util_libc; + <span class="kw">mod </span>use_file; + <span class="attribute">#[path = <span class="string">"macos.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(target_os = <span class="string">"openbsd"</span>)] </span>{ + <span class="kw">mod </span>util_libc; + <span class="attribute">#[path = <span class="string">"openbsd.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(target_os = <span class="string">"wasi"</span>)] </span>{ + <span class="attribute">#[path = <span class="string">"wasi.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(all(target_arch = <span class="string">"x86_64"</span>, target_os = <span class="string">"hermit"</span>))] </span>{ + <span class="attribute">#[path = <span class="string">"rdrand.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(target_os = <span class="string">"vxworks"</span>)] </span>{ + <span class="kw">mod </span>util_libc; + <span class="attribute">#[path = <span class="string">"vxworks.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(target_os = <span class="string">"solid_asp3"</span>)] </span>{ + <span class="attribute">#[path = <span class="string">"solid.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(target_os = <span class="string">"espidf"</span>)] </span>{ + <span class="attribute">#[path = <span class="string">"espidf.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(windows)] </span>{ + <span class="attribute">#[path = <span class="string">"windows.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(all(target_arch = <span class="string">"x86_64"</span>, target_env = <span class="string">"sgx"</span>))] </span>{ + <span class="attribute">#[path = <span class="string">"rdrand.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(all(feature = <span class="string">"rdrand"</span>, + any(target_arch = <span class="string">"x86_64"</span>, target_arch = <span class="string">"x86"</span>)))] </span>{ + <span class="attribute">#[path = <span class="string">"rdrand.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(all(feature = <span class="string">"js"</span>, + target_arch = <span class="string">"wasm32"</span>, target_os = <span class="string">"unknown"</span>))] </span>{ + <span class="attribute">#[path = <span class="string">"js.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(all(target_os = <span class="string">"horizon"</span>, target_arch = <span class="string">"arm"</span>))] </span>{ + <span class="comment">// We check for target_arch = "arm" because the Nintendo Switch also + // uses Horizon OS (it is aarch64). + </span><span class="kw">mod </span>util_libc; + <span class="attribute">#[path = <span class="string">"3ds.rs"</span>] </span><span class="kw">mod </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(feature = <span class="string">"custom"</span>)] </span>{ + <span class="kw">use </span>custom <span class="kw">as </span>imp; + } <span class="kw">else if </span><span class="attribute">#[cfg(all(target_arch = <span class="string">"wasm32"</span>, target_os = <span class="string">"unknown"</span>))] </span>{ + <span class="macro">compile_error!</span>(<span class="string">"the wasm32-unknown-unknown target is not supported by \ + default, you may need to enable the \"js\" feature. \ + For more information see: \ + https://docs.rs/getrandom/#webassembly-support"</span>); + } <span class="kw">else </span>{ + <span class="macro">compile_error!</span>(<span class="string">"target is not supported, for more information see: \ + https://docs.rs/getrandom/#unsupported-targets"</span>); + } +} + +<span class="doccomment">/// Fill `dest` with random bytes from the system's preferred random number +/// source. +/// +/// This function returns an error on any failure, including partial reads. We +/// make no guarantees regarding the contents of `dest` on error. If `dest` is +/// empty, `getrandom` immediately returns success, making no calls to the +/// underlying operating system. +/// +/// Blocking is possible, at least during early boot; see module documentation. +/// +/// In general, `getrandom` will be fast enough for interactive usage, though +/// significantly slower than a user-space CSPRNG; for the latter consider +/// [`rand::thread_rng`](https://docs.rs/rand/*/rand/fn.thread_rng.html). +</span><span class="kw">pub fn </span>getrandom(dest: <span class="kw-2">&mut </span>[u8]) -> <span class="prelude-ty">Result</span><(), Error> { + <span class="kw">if </span>dest.is_empty() { + <span class="kw">return </span><span class="prelude-val">Ok</span>(()); + } + imp::getrandom_inner(dest) +} +</code></pre></div> +</section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="getrandom" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)" ></div></body></html>
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