Add MADV_FREE and MADV_SOFT_OFFLINE for Android/Linux

Author: Susurrus

libc-test/build.rs

@@ -199,6 +199,7 @@ fn main() {
     }
 
     if linux || android {
+        cfg.header("asm/mman.h");
         cfg.header("malloc.h");
         cfg.header("net/ethernet.h");
         cfg.header("netpacket/packet.h");
@@ -459,6 +460,11 @@ fn main() {
             // asm/termios.h and ioctl.h (+ some other headers) because of redeclared types.
             "CMSPAR" if mips && linux && !musl => true,
 
+            // On mips Linux targets, MADV_SOFT_OFFLINE is currently missing, though it's been added but CI has too old
+            // of a Linux version. Since it exists on all other Linux targets, just ignore this for now and remove once
+            // it's been fixed in CI.
+            "MADV_SOFT_OFFLINE" if mips && linux => true,
+
             _ => false,
         }
     });

src/unix/notbsd/mod.rs

@@ -411,12 +411,14 @@ pub const MADV_RANDOM: ::c_int = 1;
 pub const MADV_SEQUENTIAL: ::c_int = 2;
 pub const MADV_WILLNEED: ::c_int = 3;
 pub const MADV_DONTNEED: ::c_int = 4;
+pub const MADV_FREE: ::c_int = 8;
 pub const MADV_REMOVE: ::c_int = 9;
 pub const MADV_DONTFORK: ::c_int = 10;
 pub const MADV_DOFORK: ::c_int = 11;
 pub const MADV_MERGEABLE: ::c_int = 12;
 pub const MADV_UNMERGEABLE: ::c_int = 13;
 pub const MADV_HWPOISON: ::c_int = 100;
+pub const MADV_SOFT_OFFLINE: ::c_int = 101;
 
 pub const IFF_UP: ::c_int = 0x1;
 pub const IFF_BROADCAST: ::c_int = 0x2;