Squashed commit of the following:

commit 7f38609b8eb6e6c1c92a24c7cbc5b75afe894de3
Author: rupansh-arch <rupanshsekar@hotmail.com>
Date:   Mon Oct 18 03:55:30 2021 +0530

    CHANGELOG: add process_vm_* entry

commit 9d119d5
Author: rupansh-arch <rupanshsekar@hotmail.com>
Date:   Tue Oct 12 23:02:17 2021 +0530

    process_vm_*: fix documentation for android

commit 09177b3
Author: rupansh-arch <rupanshsekar@hotmail.com>
Date:   Sat Jun 27 13:42:03 2020 +0530

    expose process_vm_readv, process_vm_writev for android

    Signed-off-by: rupansh-arch <rupanshsekar@hotmail.com>

Author: rupansh

CHANGELOG.md

@@ -3,6 +3,14 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](https://semver.org/).
 
+## [Unreleased] - ReleaseDate
+### Added
+- Enabled `process_vm_readv` and `process_vm_writev` for Android
+  (#[1557](https://github.com/nix-rust/nix/pull/1557))
+### Changed
+### Fixed
+### Removed
+
 ## [0.23.0] - 2021-09-28
 ### Added
 

src/sys/uio.rs

@@ -91,7 +91,7 @@ pub fn pread(fd: RawFd, buf: &mut [u8], offset: off_t) -> Result<usize>{
 /// therefore not represented in Rust by an actual slice as `IoVec` is. It
 /// is used with [`process_vm_readv`](fn.process_vm_readv.html)
 /// and [`process_vm_writev`](fn.process_vm_writev.html).
-#[cfg(target_os = "linux")]
+#[cfg(any(target_os = "linux", target_os = "android"))]
 #[repr(C)]
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 pub struct RemoteIoVec {
@@ -115,13 +115,13 @@ pub struct RemoteIoVec {
 /// `CAP_SYS_PTRACE`), or you must be running as the same user as the
 /// target process and the OS must have unprivileged debugging enabled.
 ///
-/// This function is only available on Linux.
+/// This function is only available on Linux and Android(SDK23+).
 ///
 /// [`process_vm_writev`(2)]: https://man7.org/linux/man-pages/man2/process_vm_writev.2.html
 /// [ptrace]: ../ptrace/index.html
 /// [`IoVec`]: struct.IoVec.html
 /// [`RemoteIoVec`]: struct.RemoteIoVec.html
-#[cfg(target_os = "linux")]
+#[cfg(any(target_os = "linux", target_os = "android"))]
 pub fn process_vm_writev(
     pid: crate::unistd::Pid,
     local_iov: &[IoVec<&[u8]>],
@@ -150,13 +150,13 @@ pub fn process_vm_writev(
 /// `CAP_SYS_PTRACE`), or you must be running as the same user as the
 /// target process and the OS must have unprivileged debugging enabled.
 ///
-/// This function is only available on Linux.
+/// This function is only available on Linux and Android(SDK23+).
 ///
 /// [`process_vm_readv`(2)]: https://man7.org/linux/man-pages/man2/process_vm_readv.2.html
 /// [`ptrace`]: ../ptrace/index.html
 /// [`IoVec`]: struct.IoVec.html
 /// [`RemoteIoVec`]: struct.RemoteIoVec.html
-#[cfg(any(target_os = "linux"))]
+#[cfg(any(target_os = "linux", target_os = "android"))]
 pub fn process_vm_readv(
     pid: crate::unistd::Pid,
     local_iov: &[IoVec<&mut [u8]>],