sys::mman adding MMAP_TRYFIXED for netbsdlike platforms. (#2260)

Author: devnexen

Cargo.toml

@@ -28,7 +28,7 @@ targets = [
 ]
 
 [dependencies]
-libc = { git = "https://github.com/rust-lang/libc", rev = "497ac428bc010b5db9682ecf94cd567b31d53e5c", features = ["extra_traits"] }
+libc = { git = "https://github.com/rust-lang/libc", rev = "f37806e499409eab8cfa897280a869bc5e2623a9", features = ["extra_traits"] }
 bitflags = "2.3.1"
 cfg-if = "1.0"
 pin-utils = { version = "0.1.0", optional = true }

changelog/2260.added.md

@@ -0,0 +1 @@
+Added `MmapFlags::MAP_FIXED` constant in `sys::mman` for netbsd and openbsd

src/sys/mman.rs

@@ -154,6 +154,10 @@ libc_bitflags! {
         /// Pages will be discarded in the core dumps.
         #[cfg(target_os = "openbsd")]
         MAP_CONCEAL;
+        /// Attempt to place the mapping at exactly the address specified in `addr`.
+        /// it's a default behavior on OpenBSD.
+        #[cfg(netbsdlike)]
+        MAP_TRYFIXED;
     }
 }