add mman::mprotect

Author: acfoltzer

CHANGELOG.md

@@ -5,6 +5,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 ### Added
+- Added an `mprotect` wrapper.
+  ([#991](https://github.com/nix-rust/nix/pull/991))
 ### Changed
 ### Fixed
 ### Removed

src/sys/mman.rs

@@ -258,6 +258,10 @@ pub unsafe fn madvise(addr: *mut c_void, length: size_t, advise: MmapAdvise) ->
     Errno::result(libc::madvise(addr, length, advise as i32)).map(drop)
 }
 
+pub unsafe fn mprotect(addr: *mut c_void, length: size_t, prot: ProtFlags) -> Result<()> {
+    Errno::result(libc::mprotect(addr, length, prot.bits())).map(drop)
+}
+
 pub unsafe fn msync(addr: *mut c_void, length: size_t, flags: MsFlags) -> Result<()> {
     Errno::result(libc::msync(addr, length, flags.bits())).map(drop)
 }