Merge #1636

1636: Add MAP_FIXED_NOREPLACE on Linux r=rtzoeller a=rtzoeller

Resolves #1393.

Co-authored-by: Ryan Zoeller <rtzoeller@rtzoeller.com>

Author: bors[bot]

CHANGELOG.md

@@ -35,6 +35,8 @@ This project adheres to [Semantic Versioning](https://semver.org/).
   (#[1634](https://github.com/nix-rust/nix/pull/1634))
 - Added `getresuid`, `setresuid`, `getresgid`, and `setresgid` on DragonFly, FreeBSD, and OpenBSD.
   (#[1628](https://github.com/nix-rust/nix/pull/1628))
+- Added `MAP_FIXED_NOREPLACE` on Linux.
+  (#[1636](https://github.com/nix-rust/nix/pull/1636))
 
 ### Changed
 ### Fixed

src/sys/mman.rs

@@ -43,6 +43,10 @@ libc_bitflags!{
         MAP_PRIVATE;
         /// Place the mapping at exactly the address specified in `addr`.
         MAP_FIXED;
+        /// Place the mapping at exactly the address specified in `addr`, but never clobber an existing range.
+        #[cfg(target_os = "linux")]
+        #[cfg_attr(docsrs, doc(cfg(all())))]
+        MAP_FIXED_NOREPLACE;
         /// To be used with `MAP_FIXED`, to forbid the system
         /// to select a different address than the one specified.
         #[cfg(target_os = "freebsd")]