Import epoll am: a91672c7c1 am: b7f4de0da4 am: 165f2d1b98 am: c7cb29e405

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/epoll/+/2752231

Change-Id: I70e4fe0a00f33ba47fbc112eb69ad51a1c22b8cf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

13 files changed, 658 insertions, 0 deletions

diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
new file mode 100644
index 0000000..b6d2b23
--- /dev/null
+++ b/.cargo_vcs_info.json
@@ -0,0 +1,6 @@
+{
+  "git": {
+    "sha1": "a3f893c54e4e064c66adf7a927db3f93579c027e"
+  },
+  "path_in_vcs": ""
+}
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d569ccf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+target
+*.lock
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..22761ba
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1 @@
+language: rust
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..e970f5a
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,17 @@
+// This file is generated by cargo2android.py --run.
+// Do not modify this file as changes will be overridden on upgrade.
+
+
+
+rust_library_host {
+    name: "libepoll",
+    crate_name: "epoll",
+    cargo_env_compat: true,
+    cargo_pkg_version: "4.3.3",
+    srcs: ["src/lib.rs"],
+    edition: "2015",
+    rustlibs: [
+        "libbitflags",
+        "liblibc",
+    ],
+}
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..8cb833c
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,27 @@
+# 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]
+name = "epoll"
+version = "4.3.3"
+authors = ["Nathan Sizemore <nathanrsizemore@gmail.com>"]
+description = "Safe epoll interface."
+documentation = "https://docs.rs/epoll/"
+readme = "README.md"
+keywords = ["epoll"]
+license = "MPL-2.0"
+repository = "https://github.com/nathansizemore/epoll"
+
+[dependencies.bitflags]
+version = "2"
+
+[dependencies.libc]
+version = "0.2"
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
new file mode 100644
index 0000000..099f628
--- /dev/null
+++ b/Cargo.toml.orig
@@ -0,0 +1,14 @@
+[package]
+name = "epoll"
+version = "4.3.3"
+authors = ["Nathan Sizemore <nathanrsizemore@gmail.com>"]
+description = "Safe epoll interface."
+readme = "README.md"
+keywords = ["epoll"]
+license = "MPL-2.0"
+repository = "https://github.com/nathansizemore/epoll"
+documentation = "https://docs.rs/epoll/"
+
+[dependencies]
+libc = "0.2"
+bitflags = "2"
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..be2cc4d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,362 @@
+Mozilla Public License, version 2.0
+
+1. Definitions
+
+1.1. "Contributor"
+
+     means each individual or legal entity that creates, contributes to the
+     creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+
+     means the combination of the Contributions of others (if any) used by a
+     Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+
+     means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+
+     means Source Code Form to which the initial Contributor has attached the
+     notice in Exhibit A, the Executable Form of such Source Code Form, and
+     Modifications of such Source Code Form, in each case including portions
+     thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+     means
+
+     a. that the initial Contributor has attached the notice described in
+        Exhibit B to the Covered Software; or
+
+     b. that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the terms of
+        a Secondary License.
+
+1.6. "Executable Form"
+
+     means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+
+     means a work that combines Covered Software with other material, in a
+     separate file or files, that is not Covered Software.
+
+1.8. "License"
+
+     means this document.
+
+1.9. "Licensable"
+
+     means having the right to grant, to the maximum extent possible, whether
+     at the time of the initial grant or subsequently, any and all of the
+     rights conveyed by this License.
+
+1.10. "Modifications"
+
+     means any of the following:
+
+     a. any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered Software; or
+
+     b. any new file in Source Code Form that contains any Covered Software.
+
+1.11. "Patent Claims" of a Contributor
+
+      means any patent claim(s), including without limitation, method,
+      process, and apparatus claims, in any patent Licensable by such
+      Contributor that would be infringed, but for the grant of the License,
+      by the making, using, selling, offering for sale, having made, import,
+      or transfer of either its Contributions or its Contributor Version.
+
+1.12. "Secondary License"
+
+      means either the GNU General Public License, Version 2.0, the GNU Lesser
+      General Public License, Version 2.1, the GNU Affero General Public
+      License, Version 3.0, or any later versions of those licenses.
+
+1.13. "Source Code Form"
+
+      means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+
+      means an individual or a legal entity exercising rights under this
+      License. For legal entities, "You" includes any entity that controls, is
+      controlled by, or is under common control with You. For purposes of this
+      definition, "control" means (a) the power, direct or indirect, to cause
+      the direction or management of such entity, whether by contract or
+      otherwise, or (b) ownership of more than fifty percent (50%) of the
+      outstanding shares or beneficial ownership of such entity.
+
+
+2. License Grants and Conditions
+
+2.1. Grants
+
+     Each Contributor hereby grants You a world-wide, royalty-free,
+     non-exclusive license:
+
+     a. under intellectual property rights (other than patent or trademark)
+        Licensable by such Contributor to use, reproduce, make available,
+        modify, display, perform, distribute, and otherwise exploit its
+        Contributions, either on an unmodified basis, with Modifications, or
+        as part of a Larger Work; and
+
+     b. under Patent Claims of such Contributor to make, use, sell, offer for
+        sale, have made, import, and otherwise transfer either its
+        Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+     The licenses granted in Section 2.1 with respect to any Contribution
+     become effective for each Contribution on the date the Contributor first
+     distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+     The licenses granted in this Section 2 are the only rights granted under
+     this License. No additional rights or licenses will be implied from the
+     distribution or licensing of Covered Software under this License.
+     Notwithstanding Section 2.1(b) above, no patent license is granted by a
+     Contributor:
+
+     a. for any code that a Contributor has removed from Covered Software; or
+
+     b. for infringements caused by: (i) Your and any other third party's
+        modifications of Covered Software, or (ii) the combination of its
+        Contributions with other software (except as part of its Contributor
+        Version); or
+
+     c. under Patent Claims infringed by Covered Software in the absence of
+        its Contributions.
+
+     This License does not grant any rights in the trademarks, service marks,
+     or logos of any Contributor (except as may be necessary to comply with
+     the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+     No Contributor makes additional grants as a result of Your choice to
+     distribute the Covered Software under a subsequent version of this
+     License (see Section 10.2) or under the terms of a Secondary License (if
+     permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+     Each Contributor represents that the Contributor believes its
+     Contributions are its original creation(s) or it has sufficient rights to
+     grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+     This License is not intended to limit any rights You have under
+     applicable copyright doctrines of fair use, fair dealing, or other
+     equivalents.
+
+2.7. Conditions
+
+     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
+     Section 2.1.
+
+
+3. Responsibilities
+
+3.1. Distribution of Source Form
+
+     All distribution of Covered Software in Source Code Form, including any
+     Modifications that You create or to which You contribute, must be under
+     the terms of this License. You must inform recipients that the Source
+     Code Form of the Covered Software is governed by the terms of this
+     License, and how they can obtain a copy of this License. You may not
+     attempt to alter or restrict the recipients' rights in the Source Code
+     Form.
+
+3.2. Distribution of Executable Form
+
+     If You distribute Covered Software in Executable Form then:
+
+     a. such Covered Software must also be made available in Source Code Form,
+        as described in Section 3.1, and You must inform recipients of the
+        Executable Form how they can obtain a copy of such Source Code Form by
+        reasonable means in a timely manner, at a charge no more than the cost
+        of distribution to the recipient; and
+
+     b. You may distribute such Executable Form under the terms of this
+        License, or sublicense it under different terms, provided that the
+        license for the Executable Form does not attempt to limit or alter the
+        recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+     You may create and distribute a Larger Work under terms of Your choice,
+     provided that You also comply with the requirements of this License for
+     the Covered Software. If the Larger Work is a combination of Covered
+     Software with a work governed by one or more Secondary Licenses, and the
+     Covered Software is not Incompatible With Secondary Licenses, this
+     License permits You to additionally distribute such Covered Software
+     under the terms of such Secondary License(s), so that the recipient of
+     the Larger Work may, at their option, further distribute the Covered
+     Software under the terms of either this License or such Secondary
+     License(s).
+
+3.4. Notices
+
+     You may not remove or alter the substance of any license notices
+     (including copyright notices, patent notices, disclaimers of warranty, or
+     limitations of liability) contained within the Source Code Form of the
+     Covered Software, except that You may alter any license notices to the
+     extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+     You may choose to offer, and to charge a fee for, warranty, support,
+     indemnity or liability obligations to one or more recipients of Covered
+     Software. However, You may do so only on Your own behalf, and not on
+     behalf of any Contributor. You must make it absolutely clear that any
+     such warranty, support, indemnity, or liability obligation is offered by
+     You alone, and You hereby agree to indemnify every Contributor for any
+     liability incurred by such Contributor as a result of warranty, support,
+     indemnity or liability terms You offer. You may include additional
+     disclaimers of warranty and limitations of liability specific to any
+     jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+
+   If it is impossible for You to comply with any of the terms of this License
+   with respect to some or all of the Covered Software due to statute,
+   judicial order, or regulation then You must: (a) comply with the terms of
+   this License to the maximum extent possible; and (b) describe the
+   limitations and the code they affect. Such description must be placed in a
+   text file included with all distributions of the Covered Software under
+   this License. Except to the extent prohibited by statute or regulation,
+   such description must be sufficiently detailed for a recipient of ordinary
+   skill to be able to understand it.
+
+5. Termination
+
+5.1. The rights granted under this License will terminate automatically if You
+     fail to comply with any of its terms. However, if You become compliant,
+     then the rights granted under this License from a particular Contributor
+     are reinstated (a) provisionally, unless and until such Contributor
+     explicitly and finally terminates Your grants, and (b) on an ongoing
+     basis, if such Contributor fails to notify You of the non-compliance by
+     some reasonable means prior to 60 days after You have come back into
+     compliance. Moreover, Your grants from a particular Contributor are
+     reinstated on an ongoing basis if such Contributor notifies You of the
+     non-compliance by some reasonable means, this is the first time You have
+     received notice of non-compliance with this License from such
+     Contributor, and You become compliant prior to 30 days after Your receipt
+     of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+     infringement claim (excluding declaratory judgment actions,
+     counter-claims, and cross-claims) alleging that a Contributor Version
+     directly or indirectly infringes any patent, then the rights granted to
+     You by any and all Contributors for the Covered Software under Section
+     2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
+     license agreements (excluding distributors and resellers) which have been
+     validly granted by You or Your distributors under this License prior to
+     termination shall survive termination.
+
+6. Disclaimer of Warranty
+
+   Covered Software is provided under this License on an "as is" basis,
+   without warranty of any kind, either expressed, implied, or statutory,
+   including, without limitation, warranties that the Covered Software is free
+   of defects, merchantable, fit for a particular purpose or non-infringing.
+   The entire risk as to the quality and performance of the Covered Software
+   is with You. Should any Covered Software prove defective in any respect,
+   You (not any Contributor) assume the cost of any necessary servicing,
+   repair, or correction. This disclaimer of warranty constitutes an essential
+   part of this License. No use of  any Covered Software is authorized under
+   this License except under this disclaimer.
+
+7. Limitation of Liability
+
+   Under no circumstances and under no legal theory, whether tort (including
+   negligence), contract, or otherwise, shall any Contributor, or anyone who
+   distributes Covered Software as permitted above, be liable to You for any
+   direct, indirect, special, incidental, or consequential damages of any
+   character including, without limitation, damages for lost profits, loss of
+   goodwill, work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses, even if such party shall have been
+   informed of the possibility of such damages. This limitation of liability
+   shall not apply to liability for death or personal injury resulting from
+   such party's negligence to the extent applicable law prohibits such
+   limitation. Some jurisdictions do not allow the exclusion or limitation of
+   incidental or consequential damages, so this exclusion and limitation may
+   not apply to You.
+
+8. Litigation
+
+   Any litigation relating to this License may be brought only in the courts
+   of a jurisdiction where the defendant maintains its principal place of
+   business and such litigation shall be governed by laws of that
+   jurisdiction, without reference to its conflict-of-law provisions. Nothing
+   in this Section shall prevent a party's ability to bring cross-claims or
+   counter-claims.
+
+9. Miscellaneous
+
+   This License represents the complete agreement concerning the subject
+   matter hereof. If any provision of this License is held to be
+   unenforceable, such provision shall be reformed only to the extent
+   necessary to make it enforceable. Any law or regulation which provides that
+   the language of a contract shall be construed against the drafter shall not
+   be used to construe this License against a Contributor.
+
+
+10. Versions of the License
+
+10.1. New Versions
+
+      Mozilla Foundation is the license steward. Except as provided in Section
+      10.3, no one other than the license steward has the right to modify or
+      publish new versions of this License. Each version will be given a
+      distinguishing version number.
+
+10.2. Effect of New Versions
+
+      You may distribute the Covered Software under the terms of the version
+      of the License under which You originally received the Covered Software,
+      or under the terms of any subsequent version published by the license
+      steward.
+
+10.3. Modified Versions
+
+      If you create software not governed by this License, and you want to
+      create a new license for such software, you may create and use a
+      modified version of this License if you rename the license and remove
+      any references to the name of the license steward (except to note that
+      such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+      Licenses If You choose to distribute Source Code Form that is
+      Incompatible With Secondary Licenses under the terms of this version of
+      the License, the notice described in Exhibit B of this License must be
+      attached.
+
+Exhibit A - Source Code Form License Notice
+
+      This Source Code Form is subject to the
+      terms of the Mozilla Public License, v.
+      2.0. If a copy of the MPL was not
+      distributed with this file, You can
+      obtain one at
+      http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular file,
+then You may include the notice in a location (such as a LICENSE file in a
+relevant directory) where a recipient would be likely to look for such a
+notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+
+      This Source Code Form is "Incompatible
+      With Secondary Licenses", as defined by
+      the Mozilla Public License, v. 2.0.
diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..b27c236
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,19 @@
+name: "epoll"
+description: "Safe epoll interface."
+third_party {
+  identifier {
+    type: "crates.io"
+    value: "https://crates.io/crates/epoll"
+  }
+  identifier {
+    type: "Archive"
+    value: "https://static.crates.io/crates/epoll/epoll-4.3.3.crate"
+  }
+  version: "4.3.3"
+  license_type: RECIPROCAL
+  last_upgrade_date {
+    year: 2023
+    month: 8
+    day: 23
+  }
+}
diff --git a/MODULE_LICENSE_BSD_LIKE b/MODULE_LICENSE_BSD_LIKE
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/MODULE_LICENSE_BSD_LIKE
diff --git a/OWNERS b/OWNERS
new file mode 100644
index 0000000..45dc4dd
--- /dev/null
+++ b/OWNERS
@@ -0,0 +1 @@
+include platform/prebuilts/rust:master:/OWNERS
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e00a9b4
--- /dev/null
+++ b/README.md
@@ -0,0 +1,20 @@
+# epoll [<img src="https://travis-ci.org/nathansizemore/epoll.svg?branch=master">][travis-badge]
+
+Safe wrapper around the Linux kernel's [epoll][epoll-man-page] API.
+
+[Documentation][docs]
+
+
+### Author
+
+Nathan Sizemore, nathanrsizemore@gmail.com
+
+### License
+
+epoll is available under the MPL-2.0 license. See the LICENSE file for more info.
+
+
+
+[travis-badge]: https://travis-ci.org/nathansizemore/epoll
+[docs]: https://docs.rs/epoll
+[epoll-man-page]: http://man7.org/linux/man-pages/man7/epoll.7.html
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..5c8d931
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1 @@
+max_width = 80
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..f2f8c4d
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,188 @@
+// Copyright 2015 Nathan Sizemore <nathanrsizemore@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
+// If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#[macro_use]
+extern crate bitflags;
+extern crate libc;
+
+use std::fmt::{Debug, Formatter, Result};
+use std::io::{self, Error};
+use std::os::unix::io::RawFd;
+
+#[repr(i32)]
+#[allow(non_camel_case_types)]
+pub enum ControlOptions {
+    /// Indicates an addition to the interest list.
+    EPOLL_CTL_ADD = libc::EPOLL_CTL_ADD,
+    /// Indicates a modification of flags for an interest already in list.
+    EPOLL_CTL_MOD = libc::EPOLL_CTL_MOD,
+    /// Indicates a removal of an interest from the list.
+    EPOLL_CTL_DEL = libc::EPOLL_CTL_DEL,
+}
+
+bitflags! {
+
+    #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+    pub struct Events: u32 {
+        /// Sets the Edge Triggered behavior for the associated file descriptor.
+        ///
+        /// The default behavior for epoll is Level Triggered.
+        const EPOLLET      = libc::EPOLLET as u32;
+        /// The associated file is available for read operations.
+        const EPOLLIN      = libc::EPOLLIN as u32;
+        /// Error condition happened on the associated file descriptor.
+        ///
+        /// `wait` will always wait for this event; is not necessary to set it in events.
+        const EPOLLERR     = libc::EPOLLERR as u32;
+        /// Hang up happened on the associated file descriptor.
+        ///
+        /// `wait` will always wait for this event; it is not necessary to set it in events.
+        /// Note that when reading from a channel such as a pipe or a stream socket, this event
+        /// merely indicates that the peer closed its end of the channel. Subsequent reads from
+        /// the channel will return 0 (end of file) only after all outstanding data in the
+        /// channel has been consumed.
+        const EPOLLHUP     = libc::EPOLLHUP as u32;
+        /// The associated file is available for write operations.
+        const EPOLLOUT     = libc::EPOLLOUT as u32;
+        /// There is urgent data available for read operations.
+        const EPOLLPRI     = libc::EPOLLPRI as u32;
+        /// Stream socket peer closed connection, or shut down writing half of connection.
+        ///
+        /// This flag is especially useful for writing simple code to detect peer shutdown when
+        /// using Edge Triggered monitoring.
+        const EPOLLRDHUP   = libc::EPOLLRDHUP as u32;
+        /// If `EPOLLONESHOT` and `EPOLLET` are clear and the process has the `CAP_BLOCK_SUSPEND`
+        /// capability, ensure that the system does not enter "suspend" or "hibernate" while this
+        /// event is pending or being processed.
+        ///
+        /// The event is considered as being "processed" from the time when it is returned by
+        /// a call to `wait` until the next call to `wait` on the same `EpollInstance`
+        /// descriptor, the closure of that file descriptor, the removal of the event file
+        /// descriptor with `EPOLL_CTL_DEL`, or the clearing of `EPOLLWAKEUP` for the event file
+        /// descriptor with `EPOLL_CTL_MOD`.
+        const EPOLLWAKEUP  = libc::EPOLLWAKEUP as u32;
+        /// Sets the one-shot behavior for the associated file descriptor.
+        ///
+        /// This means that after an event is pulled out with `wait` the associated file
+        /// descriptor is internally disabled and no other events will be reported by the epoll
+        /// interface.  The user must call `ctl` with `EPOLL_CTL_MOD` to rearm the file
+        /// descriptor with a new event mask.
+        const EPOLLONESHOT = libc::EPOLLONESHOT as u32;
+        /// Sets an exclusive wakeup mode for the epoll file descriptor that is being attached to
+        /// the target file descriptor, `fd`. When a wakeup event occurs and multiple epoll file
+        /// descriptors are attached to the same target file using `EPOLLEXCLUSIVE`, one or more of
+        /// the epoll file descriptors will receive an event with `wait`. The default in this
+        /// scenario (when `EPOLLEXCLUSIVE` is not set) is for all epoll file descriptors to
+        /// receive an event. `EPOLLEXCLUSIVE` is thus useful for avoiding thundering herd problems
+        /// in certain scenarios.
+        ///
+        /// If the same file descriptor is in multiple epoll instances, some with the
+        /// `EPOLLEXCLUSIVE` flag, and others without, then events will be provided to all epoll
+        /// instances that did not specify `EPOLLEXCLUSIVE`, and at least one of the epoll
+        /// instances that did specify `EPOLLEXCLUSIVE`.
+        ///
+        /// The following values may be specified in conjunction with `EPOLLEXCLUSIVE`: `EPOLLIN`,
+        /// `EPOLLOUT`, `EPOLLWAKEUP`, and `EPOLLET`. `EPOLLHUP` and `EPOLLERR` can also be
+        /// specified, but this is not required: as usual, these events are always reported if they
+        /// occur, regardless of whether they are specified in `Events`. Attempts to specify other
+        /// values in `Events` yield the error `EINVAL`.
+        ///
+        /// `EPOLLEXCLUSIVE` may be used only in an `EPOLL_CTL_ADD` operation; attempts to employ
+        /// it with `EPOLL_CTL_MOD` yield an error. If `EPOLLEXCLUSIVE` has been set using `ctl`,
+        /// then a subsequent `EPOLL_CTL_MOD` on the same `epfd`, `fd` pair yields an error. A call
+        /// to `ctl` that specifies `EPOLLEXCLUSIVE` in `Events` and specifies the target file
+        /// descriptor `fd` as an epoll instance will likewise fail. The error in all of these
+        /// cases is `EINVAL`.
+        ///
+        /// The `EPOLLEXCLUSIVE` flag is an input flag for the `Event.events` field when calling
+        /// `ctl`; it is never returned by `wait`.
+        const EPOLLEXCLUSIVE = libc::EPOLLEXCLUSIVE as u32;
+    }
+}
+
+/// 'libc::epoll_event' equivalent.
+#[repr(C)]
+#[cfg_attr(target_arch = "x86_64", repr(packed))]
+#[derive(Clone, Copy)]
+pub struct Event {
+    pub events: u32,
+    pub data: u64,
+}
+
+impl Event {
+    pub fn new(events: Events, data: u64) -> Event {
+        Event {
+            events: events.bits(),
+            data: data,
+        }
+    }
+}
+
+impl Debug for Event {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
+        let data = self.data;
+        f.debug_struct("Event")
+            .field("events", &Events::from_bits_retain(self.events)) // Retain so we can see erroneously set bits too
+            .field("data", &data)
+            .finish()
+    }
+}
+
+/// Creates a new epoll file descriptor.
+///
+/// If `cloexec` is true, `FD_CLOEXEC` will be set on the returned file descriptor.
+///
+/// ## Notes
+///
+/// * `epoll_create1()` is the underlying syscall.
+pub fn create(cloexec: bool) -> io::Result<RawFd> {
+    let flags = if cloexec { libc::EPOLL_CLOEXEC } else { 0 };
+    unsafe { cvt(libc::epoll_create1(flags)) }
+}
+
+/// Safe wrapper for `libc::epoll_ctl`
+pub fn ctl(
+    epfd: RawFd,
+    op: ControlOptions,
+    fd: RawFd,
+    mut event: Event,
+) -> io::Result<()> {
+    let e = &mut event as *mut _ as *mut libc::epoll_event;
+    unsafe { cvt(libc::epoll_ctl(epfd, op as i32, fd, e))? };
+    Ok(())
+}
+
+/// Safe wrapper for `libc::epoll_wait`
+///
+/// ## Notes
+///
+/// * If `timeout` is negative, it will block until an event is received.
+pub fn wait(epfd: RawFd, timeout: i32, buf: &mut [Event]) -> io::Result<usize> {
+    let timeout = if timeout < -1 { -1 } else { timeout };
+    let num_events = unsafe {
+        cvt(libc::epoll_wait(
+            epfd,
+            buf.as_mut_ptr() as *mut libc::epoll_event,
+            buf.len() as i32,
+            timeout,
+        ))? as usize
+    };
+    Ok(num_events)
+}
+
+/// Safe wrapper for `libc::close`
+pub fn close(epfd: RawFd) -> io::Result<()> {
+    cvt(unsafe { libc::close(epfd) })?;
+    Ok(())
+}
+
+fn cvt(result: libc::c_int) -> io::Result<libc::c_int> {
+    if result < 0 {
+        Err(Error::last_os_error())
+    } else {
+        Ok(result)
+    }
+}