Merge #1284

1284: Expose SeekData and SeekHole on all Linux targets r=asomers a=Amanieu

These were previously missing on musl and mips targets because of
missing definitions in the libc crate.

Co-authored-by: Amanieu d'Antras <amanieu@gmail.com>
Co-authored-by: Alan Somers <asomers@gmail.com>

CHANGELOG.md

@@ -4,10 +4,12 @@ All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased] - ReleaseDate
+### Added
 - Added Netlink protocol families to the `SockProtocol` enum
 (#[1289](https://github.com/nix-rust/nix/pull/1289))
-### Added
 ### Changed
+- Expose `SeekData` and `SeekHole` on all Linux targets
+(#[1284](https://github.com/nix-rust/nix/pull/1284))
 - Changed unistd::{execv,execve,execvp,execvpe,fexecve,execveat} to take both `&[&CStr]` and `&[CString]` as its list argument(s).
   (#[1278](https://github.com/nix-rust/nix/pull/1278))
 ### Fixed

src/unistd.rs

@@ -1018,20 +1018,14 @@ pub enum Whence {
     /// Specify an offset relative to the next location in the file greater than or
     /// equal to offset that contains some data. If offset points to
     /// some data, then the file offset is set to offset.
-    #[cfg(any(target_os = "dragonfly", target_os = "freebsd",
-          all(target_os = "linux", not(any(target_env = "musl",
-                                           target_arch = "mips",
-                                           target_arch = "mips64")))))]
+    #[cfg(any(target_os = "dragonfly", target_os = "freebsd", target_os = "linux"))]
     SeekData = libc::SEEK_DATA,
     /// Specify an offset relative to the next hole in the file greater than
     /// or equal to offset. If offset points into the middle of a hole, then
     /// the file offset should be set to offset. If there is no hole past offset,
     /// then the file offset should be adjusted to the end of the file (i.e., there
     /// is an implicit hole at the end of any file).
-    #[cfg(any(target_os = "dragonfly", target_os = "freebsd",
-          all(target_os = "linux", not(any(target_env = "musl",
-                                           target_arch = "mips",
-                                           target_arch = "mips64")))))]
+    #[cfg(any(target_os = "dragonfly", target_os = "freebsd", target_os = "linux"))]
     SeekHole = libc::SEEK_HOLE
 }