Make arch-specific constants dependent on sys.info().machine

pkg/os/lib/src/system_linux.dart

 // Copyright (c) 2014, the Dartino project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
 part of os;
 
 class LinuxSystem extends PosixSystem {
   static final ForeignFunction _lseekLinux =
       ForeignLibrary.main.lookup("lseek64");
   static final ForeignFunction _openLinux =
       ForeignLibrary.main.lookup("open64");
 
+  static final bool isMips = sys.info().machine == 'mips';
+
   int get AF_INET6 => 10;
 
-  int get O_CREAT => 64;
+  int get O_CREAT => isMips ? 256 : 64;
   int get O_TRUNC => 512;
-  int get O_APPEND => 1024;
-  int get O_NONBLOCK => 2048;
+  int get O_APPEND => isMips ? 8 : 1024;
+  int get O_NONBLOCK => isMips ? 128 : 2048;
   int get O_CLOEXEC => 524288;
 
-  int get FIONREAD => 0x541B;
+  int get FIONREAD => isMips ? 0x467f : 0x541b;
 
-  int get SOL_SOCKET => 1;
+  int get SOL_SOCKET => isMips ? 65535 : 1;
 
-  int get SO_REUSEADDR => 2;
+  int get SO_REUSEADDR => isMips ? 4 : 2;
 
   // The size of fields and the struct used by uname.
   // From /usr/include/sys/utsname.h
   int get UTSNAME_LENGTH => 65;
   int get SIZEOF_UTSNAME => 6 * UTSNAME_LENGTH;
 
   ForeignFunction get _lseek => _lseekLinux;
   ForeignFunction get _open => _openLinux;
 }