Add unlinkat and AT_REMOVEDIR

CHANGELOG.md

@@ -15,7 +15,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
   ([#1084](https://github.com/nix-rust/nix/pull/1084))
 - Add `posix_fadvise`.
   ([#1089](https://github.com/nix-rust/nix/pull/1089))
-- Add `rename`, `renameat`, and `AT_FDCWD`.
+- Add `rename`, `renameat`, `unlinkat`, `AT_FDCWD`, and `AT_REMOVEDIR`.
   ([#1097](https://github.com/nix-rust/nix/pull/1097))
 
 ### Changed

src/fcntl.rs

@@ -25,6 +25,7 @@ pub const AT_FDCWD: RawFd = libc::AT_FDCWD as RawFd;
 
 libc_bitflags!{
     pub struct AtFlags: c_int {
+        AT_REMOVEDIR;
         AT_SYMLINK_NOFOLLOW;
         #[cfg(any(target_os = "android", target_os = "linux"))]
         AT_NO_AUTOMOUNT;

src/unistd.rs

@@ -1144,6 +1144,15 @@ pub fn unlink<P: ?Sized + NixPath>(path: &P) -> Result<()> {
     Errno::result(res).map(drop)
 }
 
+pub fn unlinkat<P: ?Sized + NixPath>(dirfd: RawFd, path: &P, flags: AtFlags) -> Result<()> {
+    let res = path.with_nix_path(|cstr| {
+        unsafe {
+            libc::unlinkat(dirfd, cstr.as_ptr(), flags.bits() as libc::c_int)
+        }
+    })?;
+    Errno::result(res).map(drop)
+}
+
 #[inline]
 pub fn chroot<P: ?Sized + NixPath>(path: &P) -> Result<()> {
     let res = path.with_nix_path(|cstr| {