Merge remote-tracking branch 'origin/upstream'platform-tools-35.0.1sdk-releasebusytown-mac-infra-release

22 files changed, 1060 insertions, 0 deletions

diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
new file mode 100644
index 0000000..93cb0b8
--- /dev/null
+++ b/.cargo_vcs_info.json
@@ -0,0 +1,6 @@
+{
+  "git": {
+    "sha1": "529718762b1f752ccc894de5380d3aa10889733d"
+  },
+  "path_in_vcs": ""
+}
\ No newline at end of file
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..98e44ee
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..dffb299
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,68 @@
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  schedule:
+    - cron: '5 21 * * 5'
+  workflow_dispatch:
+
+name: CI
+
+jobs:
+  test:
+    name: Test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        rust: [stable, nightly, '1.56']
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install toolchain
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.rust }}
+      - name: Setup cache
+        uses: Swatinem/rust-cache@v2
+      - name: Test (no features)
+        run: cargo test --no-default-features
+      - name: Test (all features)
+        run: cargo test --all-features
+
+
+  wasi:
+    name: Test WASI
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install toolchain
+        uses: dtolnay/rust-toolchain@nightly
+        with:
+          targets: wasm32-wasi
+      - name: Install wasmtime
+        run: |
+          curl https://wasmtime.dev/install.sh -sSf | bash
+          echo "$HOME/.wasmtime/bin" >> $GITHUB_PATH
+      - name: Test (no features)
+        run: CARGO_TARGET_WASM32_WASI_RUNNER=wasmtime cargo test --target wasm32-wasi --no-default-features
+      - name: Test (all features)
+        run: CARGO_TARGET_WASM32_WASI_RUNNER=wasmtime cargo test --target wasm32-wasi --all-features
+
+
+  lints:
+    name: Rustfmt & Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+      - name: Check formatting
+        run: cargo fmt --check
+      - name: Check clippy
+        run: cargo clippy -- -D warnings
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a9d37c5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+target
+Cargo.lock
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..1dcde4e
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,44 @@
+// This file is generated by cargo_embargo.
+// Do not modify this file as changes will be overridden on upgrade.
+
+// TODO: Add license.
+rust_test {
+    name: "errno_test_src_lib",
+    host_supported: true,
+    crate_name: "errno",
+    cargo_env_compat: true,
+    cargo_pkg_version: "0.3.8",
+    srcs: ["src/lib.rs"],
+    test_suites: ["general-tests"],
+    auto_gen_config: true,
+    test_options: {
+        unit_test: true,
+    },
+    edition: "2018",
+    features: [
+        "default",
+        "std",
+    ],
+    rustlibs: ["liblibc"],
+}
+
+rust_library {
+    name: "liberrno",
+    host_supported: true,
+    crate_name: "errno",
+    cargo_env_compat: true,
+    cargo_pkg_version: "0.3.8",
+    srcs: ["src/lib.rs"],
+    edition: "2018",
+    features: [
+        "default",
+        "std",
+    ],
+    rustlibs: ["liblibc"],
+    apex_available: [
+        "//apex_available:platform",
+        "//apex_available:anyapex",
+    ],
+    product_available: true,
+    vendor_available: true,
+}
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..e3add31
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,96 @@
+# [Unreleased]
+
+# [0.3.8] - 2023-11-27
+
+- Update to windows-sys 0.52.
+  [#91](https://github.com/lambda-fairy/rust-errno/pull/91)
+
+- Update minimum Rust version to 1.56
+  [#91](https://github.com/lambda-fairy/rust-errno/pull/91)
+
+# [0.3.7] - 2023-11-15
+
+- Fix `to_string()` handling for unknown error codes
+  [#88](https://github.com/lambda-fairy/rust-errno/pull/88)
+
+# [0.3.6] - 2023-11-07
+
+- Add support for tvOS and watchOS
+  [#84](https://github.com/lambda-fairy/rust-errno/pull/84)
+
+- Added support for vita target
+  [#86](https://github.com/lambda-fairy/rust-errno/pull/86)
+
+# [0.3.5] - 2023-10-08
+
+- Use __errno_location on DragonFly BSD
+  [#82](https://github.com/lambda-fairy/rust-errno/pull/82)
+
+# [0.3.4] - 2023-10-01
+
+- Add GNU/Hurd support
+  [#80](https://github.com/lambda-fairy/rust-errno/pull/80)
+
+# [0.3.3] - 2023-08-28
+
+- Disable "libc/std" in no-std configurations.
+  [#77](https://github.com/lambda-fairy/rust-errno/pull/77)
+
+- Bump errno-dragonfly to 0.1.2
+  [#75](https://github.com/lambda-fairy/rust-errno/pull/75)
+
+- Support for the ESP-IDF framework
+  [#74](https://github.com/lambda-fairy/rust-errno/pull/74)
+
+# [0.3.2] - 2023-07-30
+
+- Fix build on Hermit
+  [#73](https://github.com/lambda-fairy/rust-errno/pull/73)
+
+- Add support for QNX Neutrino
+  [#72](https://github.com/lambda-fairy/rust-errno/pull/72)
+
+# [0.3.1] - 2023-04-08
+
+- Correct link name on redox
+  [#69](https://github.com/lambda-fairy/rust-errno/pull/69)
+
+- Update windows-sys requirement from 0.45 to 0.48
+  [#70](https://github.com/lambda-fairy/rust-errno/pull/70)
+
+# [0.3.0] - 2023-02-12
+
+- Add haiku support
+  [#42](https://github.com/lambda-fairy/rust-errno/pull/42)
+
+- Add AIX support
+  [#54](https://github.com/lambda-fairy/rust-errno/pull/54)
+
+- Add formatting with `#![no_std]`
+  [#44](https://github.com/lambda-fairy/rust-errno/pull/44)
+
+- Switch from `winapi` to `windows-sys` [#55](https://github.com/lambda-fairy/rust-errno/pull/55)
+
+- Update minimum Rust version to 1.48
+  [#48](https://github.com/lambda-fairy/rust-errno/pull/48) [#55](https://github.com/lambda-fairy/rust-errno/pull/55)
+
+- Upgrade to Rust 2018 edition [#59](https://github.com/lambda-fairy/rust-errno/pull/59)
+
+- wasm32-wasi: Use `__errno_location` instead of `feature(thread_local)`. [#66](https://github.com/lambda-fairy/rust-errno/pull/66)
+
+# [0.2.8] - 2021-10-27
+
+- Optionally support no_std
+  [#31](https://github.com/lambda-fairy/rust-errno/pull/31)
+
+[Unreleased]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.8...HEAD
+[0.3.8]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.7...v0.3.8
+[0.3.7]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.6...v0.3.7
+[0.3.6]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.5...v0.3.6
+[0.3.5]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.4...v0.3.5
+[0.3.4]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.3...v0.3.4
+[0.3.3]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.2...v0.3.3
+[0.3.2]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.1...v0.3.2
+[0.3.1]: https://github.com/lambda-fairy/rust-errno/compare/v0.3.0...v0.3.1
+[0.3.0]: https://github.com/lambda-fairy/rust-errno/compare/v0.2.8...v0.3.0
+[0.2.8]: https://github.com/lambda-fairy/rust-errno/compare/v0.2.7...v0.2.8
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..e1d0bf5
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,49 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+rust-version = "1.56"
+name = "errno"
+version = "0.3.8"
+authors = ["Chris Wong <lambda.fairy@gmail.com>"]
+description = "Cross-platform interface to the `errno` variable."
+documentation = "https://docs.rs/errno"
+readme = "README.md"
+categories = [
+    "no-std",
+    "os",
+]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/lambda-fairy/rust-errno"
+
+[features]
+default = ["std"]
+std = ["libc/std"]
+
+[target."cfg(target_os=\"hermit\")".dependencies.libc]
+version = "0.2"
+default-features = false
+
+[target."cfg(target_os=\"wasi\")".dependencies.libc]
+version = "0.2"
+default-features = false
+
+[target."cfg(unix)".dependencies.libc]
+version = "0.2"
+default-features = false
+
+[target."cfg(windows)".dependencies.windows-sys]
+version = "0.52"
+features = [
+    "Win32_Foundation",
+    "Win32_System_Diagnostics_Debug",
+]
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
new file mode 100644
index 0000000..956f251
--- /dev/null
+++ b/Cargo.toml.orig
@@ -0,0 +1,33 @@
+[package]
+
+name = "errno"
+version = "0.3.8"
+authors = ["Chris Wong <lambda.fairy@gmail.com>"]
+
+license = "MIT OR Apache-2.0"
+edition = "2018"
+documentation = "https://docs.rs/errno"
+repository = "https://github.com/lambda-fairy/rust-errno"
+description = "Cross-platform interface to the `errno` variable."
+categories = ["no-std", "os"]
+rust-version = "1.56"
+
+[target.'cfg(unix)'.dependencies]
+libc = { version = "0.2", default-features = false }
+
+[target.'cfg(windows)'.dependencies.windows-sys]
+version = "0.52"
+features = [
+  "Win32_Foundation",
+  "Win32_System_Diagnostics_Debug",
+]
+
+[target.'cfg(target_os="wasi")'.dependencies]
+libc = { version = "0.2", default-features = false }
+
+[target.'cfg(target_os="hermit")'.dependencies]
+libc = { version = "0.2", default-features = false }
+
+[features]
+default = ["std"]
+std = ["libc/std"]
diff --git a/LICENSE b/LICENSE
new file mode 120000
index 0000000..6b579aa
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1 @@
+LICENSE-APACHE
\ No newline at end of file
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..16fe87b
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+   "License" shall mean the terms and conditions for use, reproduction,
+   and distribution as defined by Sections 1 through 9 of this document.
+
+   "Licensor" shall mean the copyright owner or entity authorized by
+   the copyright owner that is granting the License.
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+   "Legal Entity" shall mean the union of the acting entity and all
+   other entities that control, are controlled by, or are under common
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+   direction or management of such entity, whether by contract or
+   otherwise, or (ii) ownership of fifty percent (50%) or more of the
+   outstanding shares, or (iii) beneficial ownership of such entity.
+
+   "You" (or "Your") shall mean an individual or Legal Entity
+   exercising permissions granted by this License.
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+   "Source" form shall mean the preferred form for making modifications,
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+   "Object" form shall mean any form resulting from mechanical
+   transformation or translation of a Source form, including but
+   not limited to compiled object code, generated documentation,
+   and conversions to other media types.
+
+   "Work" shall mean the work of authorship, whether in Source or
+   Object form, made available under the License, as indicated by a
+   copyright notice that is included in or attached to the work
+   (an example is provided in the Appendix below).
+
+   "Derivative Works" shall mean any work, whether in Source or Object
+   form, that is based on (or derived from) the Work and for which the
+   editorial revisions, annotations, elaborations, or other modifications
+   represent, as a whole, an original work of authorship. For the purposes
+   of this License, Derivative Works shall not include works that remain
+   separable from, or merely link (or bind by name) to the interfaces of,
+   the Work and Derivative Works thereof.
+
+   "Contribution" shall mean any work of authorship, including
+   the original version of the Work and any modifications or additions
+   to that Work or Derivative Works thereof, that is intentionally
+   submitted to Licensor for inclusion in the Work by the copyright owner
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+   means any form of electronic, verbal, or written communication sent
+   to the Licensor or its representatives, including but not limited to
+   communication on electronic mailing lists, source code control systems,
+   and issue tracking systems that are managed by, or on behalf of, the
+   Licensor for the purpose of discussing and improving the Work, but
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+   designated in writing by the copyright owner as "Not a Contribution."
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+   "Contributor" shall mean Licensor and any individual or Legal Entity
+   on behalf of whom a Contribution has been received by Licensor and
+   subsequently incorporated within the Work.
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+2. Grant of Copyright License. Subject to the terms and conditions of
+   this License, each Contributor hereby grants to You a perpetual,
+   worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+   copyright license to reproduce, prepare Derivative Works of,
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+3. Grant of Patent License. Subject to the terms and conditions of
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+   worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+   (except as stated in this section) patent license to make, have made,
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+   institute patent litigation against any entity (including a
+   cross-claim or counterclaim in a lawsuit) alleging that the Work
+   or a Contribution incorporated within the Work constitutes direct
+   or contributory patent infringement, then any patent licenses
+   granted to You under this License for that Work shall terminate
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+4. Redistribution. You may reproduce and distribute copies of the
+   Work or Derivative Works thereof in any medium, with or without
+   modifications, and in Source or Object form, provided that You
+   meet the following conditions:
+
+   (a) You must give any other recipients of the Work or
+       Derivative Works a copy of this License; and
+
+   (b) You must cause any modified files to carry prominent notices
+       stating that You changed the files; and
+
+   (c) You must retain, in the Source form of any Derivative Works
+       that You distribute, all copyright, patent, trademark, and
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+       excluding those notices that do not pertain to any part of
+       the Derivative Works; and
+
+   (d) If the Work includes a "NOTICE" text file as part of its
+       distribution, then any Derivative Works that You distribute must
+       include a readable copy of the attribution notices contained
+       within such NOTICE file, excluding those notices that do not
+       pertain to any part of the Derivative Works, in at least one
+       of the following places: within a NOTICE text file distributed
+       as part of the Derivative Works; within the Source form or
+       documentation, if provided along with the Derivative Works; or,
+       within a display generated by the Derivative Works, if and
+       wherever such third-party notices normally appear. The contents
+       of the NOTICE file are for informational purposes only and
+       do not modify the License. You may add Your own attribution
+       notices within Derivative Works that You distribute, alongside
+       or as an addendum to the NOTICE text from the Work, provided
+       that such additional attribution notices cannot be construed
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+
+   You may add Your own copyright statement to Your modifications and
+   may provide additional or different license terms and conditions
+   for use, reproduction, or distribution of Your modifications, or
+   for any such Derivative Works as a whole, provided Your use,
+   reproduction, and distribution of the Work otherwise complies with
+   the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
+   this License, without any additional terms or conditions.
+   Notwithstanding the above, nothing herein shall supersede or modify
+   the terms of any separate license agreement you may have executed
+   with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+   names, trademarks, service marks, or product names of the Licensor,
+   except as required for reasonable and customary use in describing the
+   origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or
+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+   implied, including, without limitation, any warranties or conditions
+   of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+   PARTICULAR PURPOSE. You are solely responsible for determining the
+   appropriateness of using or redistributing the Work and assume any
+   risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
+   incidental, or consequential damages of any character arising as a
+   result of this License or out of the use or inability to use the
+   Work (including but not limited to damages for loss of goodwill,
+   work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses), even if such Contributor
+   has been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability. While redistributing
+   the Work or Derivative Works thereof, You may choose to offer,
+   and charge a fee for, acceptance of support, warranty, indemnity,
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+   License. However, in accepting such obligations, You may act only
+   on Your own behalf and on Your sole responsibility, not on behalf
+   of any other Contributor, and only if You agree to indemnify,
+   defend, and hold each Contributor harmless for any liability
+   incurred by, or claims asserted against, such Contributor by reason
+   of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+   To apply the Apache License to your work, attach the following
+   boilerplate notice, with the fields enclosed by brackets "[]"
+   replaced with your own identifying information. (Don't include
+   the brackets!)  The text should be enclosed in the appropriate
+   comment syntax for the file format. We also recommend that a
+   file or class name and description of purpose be included on the
+   same "printed page" as the copyright notice for easier
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+
+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..66b6578
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2014 Chris Wong
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..fc1a1c6
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,21 @@
+name: "errno"
+description: "Cross-platform interface to the `errno` variable."
+third_party {
+  identifier {
+    type: "crates.io"
+    value: "errno"
+  }
+  identifier {
+    type: "Archive"
+    value: "https://static.crates.io/crates/errno/errno-0.3.8.crate"
+    primary_source: true
+  }
+  version: "0.3.8"
+  # Dual-licensed, using the least restrictive per go/thirdpartylicenses#same.
+  license_type: NOTICE
+  last_upgrade_date {
+    year: 2024
+    month: 3
+    day: 20
+  }
+}
diff --git a/MODULE_LICENSE_APACHE2 b/MODULE_LICENSE_APACHE2
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/MODULE_LICENSE_APACHE2
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..697f117
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1,7 @@
+# Bug component: 688011
+include platform/prebuilts/rust:main:/OWNERS
+
+dextero@google.com
+vill@google.com
+nputikhin@google.com
+istvannador@google.com
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..6a9a42c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,62 @@
+# errno [![CI](https://github.com/lambda-fairy/rust-errno/actions/workflows/main.yml/badge.svg)](https://github.com/lambda-fairy/rust-errno/actions/workflows/main.yml) [![Cargo](https://img.shields.io/crates/v/errno.svg)](https://crates.io/crates/errno)
+
+Cross-platform interface to the [`errno`][errno] variable. Works on Rust 1.56 or newer.
+
+Documentation is available at <https://docs.rs/errno>.
+
+[errno]: https://en.wikipedia.org/wiki/Errno.h
+
+
+## Dependency
+
+Add to your `Cargo.toml`:
+
+```toml
+[dependencies]
+errno = "*"
+```
+
+
+## Comparison with `std::io::Error`
+
+The standard library provides [`Error::last_os_error`][last_os_error] which fetches `errno` in the same way.
+
+This crate provides these extra features:
+
+- No heap allocations
+- Optional `#![no_std]` support
+- A `set_errno` function
+
+[last_os_error]: https://doc.rust-lang.org/std/io/struct.Error.html#method.last_os_error
+
+
+## Examples
+
+```rust
+extern crate errno;
+use errno::{Errno, errno, set_errno};
+
+// Get the current value of errno
+let e = errno();
+
+// Set the current value of errno
+set_errno(e);
+
+// Extract the error code as an i32
+let code = e.0;
+
+// Display a human-friendly error message
+println!("Error {}: {}", code, e);
+```
+
+
+## `#![no_std]`
+
+Enable `#![no_std]` support by disabling the default `std` feature:
+
+```toml
+[dependencies]
+errno = { version = "*", default-features = false }
+```
+
+The `Error` impl will be unavailable.
diff --git a/cargo_embargo.json b/cargo_embargo.json
new file mode 100644
index 0000000..c8842d1
--- /dev/null
+++ b/cargo_embargo.json
@@ -0,0 +1,4 @@
+{
+  "run_cargo": false,
+  "tests": true
+}
diff --git a/clippy.toml b/clippy.toml
new file mode 100644
index 0000000..62ca742
--- /dev/null
+++ b/clippy.toml
@@ -0,0 +1 @@
+msrv = "1.56"
diff --git a/src/hermit.rs b/src/hermit.rs
new file mode 100644
index 0000000..331b6b1
--- /dev/null
+++ b/src/hermit.rs
@@ -0,0 +1,32 @@
+//! Implementation of `errno` functionality for RustyHermit.
+//!
+//! Currently, the error handling in RustyHermit isn't clearly
+//! defined. At the current stage of RustyHermit, only a placeholder
+//! is provided to be compatible to the classical errno interface.
+
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use crate::Errno;
+
+pub fn with_description<F, T>(_err: Errno, callback: F) -> T
+where
+    F: FnOnce(Result<&str, Errno>) -> T,
+{
+    callback(Ok("unknown error"))
+}
+
+pub const STRERROR_NAME: &str = "strerror_r";
+
+pub fn errno() -> Errno {
+    Errno(0)
+}
+
+pub fn set_errno(_: Errno) {}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..20875b5
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,156 @@
+//! Cross-platform interface to the `errno` variable.
+//!
+//! # Examples
+//! ```
+//! use errno::{Errno, errno, set_errno};
+//!
+//! // Get the current value of errno
+//! let e = errno();
+//!
+//! // Set the current value of errno
+//! set_errno(e);
+//!
+//! // Extract the error code as an i32
+//! let code = e.0;
+//!
+//! // Display a human-friendly error message
+//! println!("Error {}: {}", code, e);
+//! ```
+
+#![cfg_attr(not(feature = "std"), no_std)]
+
+#[cfg_attr(unix, path = "unix.rs")]
+#[cfg_attr(windows, path = "windows.rs")]
+#[cfg_attr(target_os = "wasi", path = "wasi.rs")]
+#[cfg_attr(target_os = "hermit", path = "hermit.rs")]
+mod sys;
+
+use core::fmt;
+#[cfg(feature = "std")]
+use std::error::Error;
+#[cfg(feature = "std")]
+use std::io;
+
+/// Wraps a platform-specific error code.
+///
+/// The `Display` instance maps the code to a human-readable string. It
+/// calls [`strerror_r`][1] under POSIX, and [`FormatMessageW`][2] on
+/// Windows.
+///
+/// [1]: http://pubs.opengroup.org/onlinepubs/009695399/functions/strerror.html
+/// [2]: https://msdn.microsoft.com/en-us/library/windows/desktop/ms679351%28v=vs.85%29.aspx
+#[derive(Copy, Clone, Eq, Ord, PartialEq, PartialOrd, Hash)]
+pub struct Errno(pub i32);
+
+impl fmt::Debug for Errno {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        sys::with_description(*self, |desc| {
+            fmt.debug_struct("Errno")
+                .field("code", &self.0)
+                .field("description", &desc.ok())
+                .finish()
+        })
+    }
+}
+
+impl fmt::Display for Errno {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        sys::with_description(*self, |desc| match desc {
+            Ok(desc) => fmt.write_str(desc),
+            Err(fm_err) => write!(
+                fmt,
+                "OS error {} ({} returned error {})",
+                self.0,
+                sys::STRERROR_NAME,
+                fm_err.0
+            ),
+        })
+    }
+}
+
+impl From<Errno> for i32 {
+    fn from(e: Errno) -> Self {
+        e.0
+    }
+}
+
+#[cfg(feature = "std")]
+impl Error for Errno {
+    // TODO: Remove when MSRV >= 1.27
+    #[allow(deprecated)]
+    fn description(&self) -> &str {
+        "system error"
+    }
+}
+
+#[cfg(feature = "std")]
+impl From<Errno> for io::Error {
+    fn from(errno: Errno) -> Self {
+        io::Error::from_raw_os_error(errno.0)
+    }
+}
+
+/// Returns the platform-specific value of `errno`.
+pub fn errno() -> Errno {
+    sys::errno()
+}
+
+/// Sets the platform-specific value of `errno`.
+pub fn set_errno(err: Errno) {
+    sys::set_errno(err)
+}
+
+#[test]
+fn it_works() {
+    let x = errno();
+    set_errno(x);
+}
+
+#[cfg(feature = "std")]
+#[test]
+fn it_works_with_to_string() {
+    let x = errno();
+    let _ = x.to_string();
+}
+
+#[cfg(feature = "std")]
+#[test]
+fn check_description() {
+    let expect = if cfg!(windows) {
+        "Incorrect function."
+    } else if cfg!(target_os = "illumos") {
+        "Not owner"
+    } else if cfg!(target_os = "wasi") {
+        "Argument list too long"
+    } else if cfg!(target_os = "haiku") {
+        "Operation not allowed"
+    } else {
+        "Operation not permitted"
+    };
+
+    let errno_code = if cfg!(target_os = "haiku") {
+        -2147483633
+    } else {
+        1
+    };
+    set_errno(Errno(errno_code));
+
+    assert_eq!(errno().to_string(), expect);
+    assert_eq!(
+        format!("{:?}", errno()),
+        format!(
+            "Errno {{ code: {}, description: Some({:?}) }}",
+            errno_code, expect
+        )
+    );
+}
+
+#[cfg(feature = "std")]
+#[test]
+fn check_error_into_errno() {
+    const ERROR_CODE: i32 = 1;
+
+    let error = io::Error::from_raw_os_error(ERROR_CODE);
+    let new_error: io::Error = Errno(ERROR_CODE).into();
+    assert_eq!(error.kind(), new_error.kind());
+}
diff --git a/src/unix.rs b/src/unix.rs
new file mode 100644
index 0000000..18951e4
--- /dev/null
+++ b/src/unix.rs
@@ -0,0 +1,101 @@
+//! Implementation of `errno` functionality for Unix systems.
+//!
+//! Adapted from `src/libstd/sys/unix/os.rs` in the Rust distribution.
+
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use core::str;
+use libc::{self, c_int, size_t, strerror_r, strlen};
+
+use crate::Errno;
+
+fn from_utf8_lossy(input: &[u8]) -> &str {
+    match str::from_utf8(input) {
+        Ok(valid) => valid,
+        Err(error) => unsafe { str::from_utf8_unchecked(&input[..error.valid_up_to()]) },
+    }
+}
+
+pub fn with_description<F, T>(err: Errno, callback: F) -> T
+where
+    F: FnOnce(Result<&str, Errno>) -> T,
+{
+    let mut buf = [0u8; 1024];
+    let c_str = unsafe {
+        let rc = strerror_r(err.0, buf.as_mut_ptr() as *mut _, buf.len() as size_t);
+        if rc != 0 {
+            // Handle negative return codes for compatibility with glibc < 2.13
+            let fm_err = match rc < 0 {
+                true => errno(),
+                false => Errno(rc),
+            };
+            if fm_err != Errno(libc::ERANGE) {
+                return callback(Err(fm_err));
+            }
+        }
+        let c_str_len = strlen(buf.as_ptr() as *const _);
+        &buf[..c_str_len]
+    };
+    callback(Ok(from_utf8_lossy(c_str)))
+}
+
+pub const STRERROR_NAME: &str = "strerror_r";
+
+pub fn errno() -> Errno {
+    unsafe { Errno(*errno_location()) }
+}
+
+pub fn set_errno(Errno(errno): Errno) {
+    unsafe {
+        *errno_location() = errno;
+    }
+}
+
+extern "C" {
+    #[cfg_attr(
+        any(
+            target_os = "macos",
+            target_os = "ios",
+            target_os = "tvos",
+            target_os = "watchos",
+            target_os = "freebsd"
+        ),
+        link_name = "__error"
+    )]
+    #[cfg_attr(
+        any(
+            target_os = "openbsd",
+            target_os = "netbsd",
+            target_os = "bitrig",
+            target_os = "android",
+            target_os = "espidf",
+            target_env = "newlib"
+        ),
+        link_name = "__errno"
+    )]
+    #[cfg_attr(
+        any(target_os = "solaris", target_os = "illumos"),
+        link_name = "___errno"
+    )]
+    #[cfg_attr(target_os = "haiku", link_name = "_errnop")]
+    #[cfg_attr(
+        any(
+            target_os = "linux",
+            target_os = "hurd",
+            target_os = "redox",
+            target_os = "dragonfly"
+        ),
+        link_name = "__errno_location"
+    )]
+    #[cfg_attr(target_os = "aix", link_name = "_Errno")]
+    #[cfg_attr(target_os = "nto", link_name = "__get_errno_ptr")]
+    fn errno_location() -> *mut c_int;
+}
diff --git a/src/wasi.rs b/src/wasi.rs
new file mode 100644
index 0000000..404d7d5
--- /dev/null
+++ b/src/wasi.rs
@@ -0,0 +1,60 @@
+//! Implementation of `errno` functionality for WASI.
+//!
+//! Adapted from `unix.rs`.
+
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use core::str;
+use libc::{self, c_int, size_t, strerror_r, strlen};
+
+use crate::Errno;
+
+fn from_utf8_lossy(input: &[u8]) -> &str {
+    match str::from_utf8(input) {
+        Ok(valid) => valid,
+        Err(error) => unsafe { str::from_utf8_unchecked(&input[..error.valid_up_to()]) },
+    }
+}
+
+pub fn with_description<F, T>(err: Errno, callback: F) -> T
+where
+    F: FnOnce(Result<&str, Errno>) -> T,
+{
+    let mut buf = [0u8; 1024];
+    let c_str = unsafe {
+        let rc = strerror_r(err.0, buf.as_mut_ptr() as *mut _, buf.len() as size_t);
+        if rc != 0 {
+            let fm_err = Errno(rc);
+            if fm_err != Errno(libc::ERANGE) {
+                return callback(Err(fm_err));
+            }
+        }
+        let c_str_len = strlen(buf.as_ptr() as *const _);
+        &buf[..c_str_len]
+    };
+    callback(Ok(from_utf8_lossy(c_str)))
+}
+
+pub const STRERROR_NAME: &str = "strerror_r";
+
+pub fn errno() -> Errno {
+    unsafe { Errno(*__errno_location()) }
+}
+
+pub fn set_errno(Errno(new_errno): Errno) {
+    unsafe {
+        *__errno_location() = new_errno;
+    }
+}
+
+extern "C" {
+    fn __errno_location() -> *mut c_int;
+}
diff --git a/src/windows.rs b/src/windows.rs
new file mode 100644
index 0000000..9c7c0e4
--- /dev/null
+++ b/src/windows.rs
@@ -0,0 +1,81 @@
+//! Implementation of `errno` functionality for Windows.
+//!
+//! Adapted from `src/libstd/sys/windows/os.rs` in the Rust distribution.
+
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use core::char::{self, REPLACEMENT_CHARACTER};
+use core::ptr;
+use core::str;
+use windows_sys::Win32::Foundation::{GetLastError, SetLastError, WIN32_ERROR};
+use windows_sys::Win32::System::Diagnostics::Debug::{
+    FormatMessageW, FORMAT_MESSAGE_FROM_SYSTEM, FORMAT_MESSAGE_IGNORE_INSERTS,
+};
+
+use crate::Errno;
+
+fn from_utf16_lossy<'a>(input: &[u16], output: &'a mut [u8]) -> &'a str {
+    let mut output_len = 0;
+    for c in char::decode_utf16(input.iter().copied().take_while(|&x| x != 0))
+        .map(|x| x.unwrap_or(REPLACEMENT_CHARACTER))
+    {
+        let c_len = c.len_utf8();
+        if c_len > output.len() - output_len {
+            break;
+        }
+        c.encode_utf8(&mut output[output_len..]);
+        output_len += c_len;
+    }
+    unsafe { str::from_utf8_unchecked(&output[..output_len]) }
+}
+
+pub fn with_description<F, T>(err: Errno, callback: F) -> T
+where
+    F: FnOnce(Result<&str, Errno>) -> T,
+{
+    // This value is calculated from the macro
+    // MAKELANGID(LANG_SYSTEM_DEFAULT, SUBLANG_SYS_DEFAULT)
+    let lang_id = 0x0800_u32;
+
+    let mut buf = [0u16; 2048];
+
+    unsafe {
+        let res = FormatMessageW(
+            FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
+            ptr::null_mut(),
+            err.0 as u32,
+            lang_id,
+            buf.as_mut_ptr(),
+            buf.len() as u32,
+            ptr::null_mut(),
+        );
+        if res == 0 {
+            // Sometimes FormatMessageW can fail e.g. system doesn't like lang_id
+            let fm_err = errno();
+            return callback(Err(fm_err));
+        }
+
+        let mut msg = [0u8; 2048];
+        let msg = from_utf16_lossy(&buf[..res as usize], &mut msg[..]);
+        // Trim trailing CRLF inserted by FormatMessageW
+        callback(Ok(msg.trim_end()))
+    }
+}
+
+pub const STRERROR_NAME: &str = "FormatMessageW";
+
+pub fn errno() -> Errno {
+    unsafe { Errno(GetLastError() as i32) }
+}
+
+pub fn set_errno(Errno(errno): Errno) {
+    unsafe { SetLastError(errno as WIN32_ERROR) }
+}