Add the MAP_HUGE_<SIZE> flags for linux.

Closes #1194

Use git libc for development
(Remember to reset this to released version for the next nix release, once libc has released >=0.2.69)

CHANGELOG.md

@@ -5,6 +5,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased] - ReleaseDate
 ### Added
+- Added support on linux systems for `MAP_HUGE_`_`SIZE`_ family of flags.
+  (#[1211](https://github.com/nix-rust/nix/pull/1211))
 - Added support for `F_OFD_*` `fcntl` commands on Linux and Android.
   (#[1195](https://github.com/nix-rust/nix/pull/1195))
 - Added `env::clearenv()`: calls `libc::clearenv` on platforms
@@ -118,7 +120,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
   // old code `readlink(&path, &mut buf)` can be replaced with the following
   let _: OsString = readlink(&path);
-  
+
   // old code `readlinkat(dirfd, &path, &mut buf)` can be replaced with the following
   let _: OsString = readlinkat(dirfd, &path);
   ```

Cargo.toml

@@ -16,7 +16,7 @@ exclude     = [
 ]
 
 [dependencies]
-libc = { version = "0.2.68", features = [ "extra_traits" ] }
+libc = { git = "https://github.com/rust-lang/libc/", features = [ "extra_traits" ] }
 bitflags = "1.1"
 cfg-if = "0.1.10"
 void = "1.0.2"

src/sys/mman.rs

@@ -77,6 +77,43 @@ libc_bitflags!{
         /// Allocate the mapping using "huge pages."
         #[cfg(any(target_os = "android", target_os = "linux"))]
         MAP_HUGETLB;
+        /// Make use of 64KB huge page (must be supported by the system)
+        #[cfg(target_os = "linux")]
+        MAP_HUGE_64KB;
+        /// Make use of 512KB huge page (must be supported by the system)
+        #[cfg(target_os = "linux")]
+        MAP_HUGE_512KB;
+        /// Make use of 1MB huge page (must be supported by the system)
+        #[cfg(target_os = "linux")]
+        MAP_HUGE_1MB;
+        /// Make use of 2MB huge page (must be supported by the system)
+        #[cfg(target_os = "linux")]
+        MAP_HUGE_2MB;
+        /// Make use of 8MB huge page (must be supported by the system)
+        #[cfg(target_os = "linux")]
+        MAP_HUGE_8MB;
+        /// Make use of 16MB huge page (must be supported by the system)
+        #[cfg(target_os = "linux")]
+        MAP_HUGE_16MB;
+        /// Make use of 32MB huge page (must be supported by the system)
+        #[cfg(target_os = "linux")]
+        MAP_HUGE_32MB;
+        /// Make use of 256MB huge page (must be supported by the system)
+        #[cfg(target_os = "linux")]
+        MAP_HUGE_256MB;
+        /// Make use of 512MB huge page (must be supported by the system)
+        #[cfg(target_os = "linux")]
+        MAP_HUGE_512MB;
+        /// Make use of 1GB huge page (must be supported by the system)
+        #[cfg(target_os = "linux")]
+        MAP_HUGE_1GB;
+        /// Make use of 2GB huge page (must be supported by the system)
+        #[cfg(target_os = "linux")]
+        MAP_HUGE_2GB;
+        /// Make use of 16GB huge page (must be supported by the system)
+        #[cfg(target_os = "linux")]
+        MAP_HUGE_16GB;
+
         /// Lock the mapped region into memory as with `mlock(2)`.
         #[cfg(target_os = "netbsd")]
         MAP_WIRED;