unit-tests/test-cases/symbol-resolver-interposed/foo.c

   1 /*
   2  * Copyright (c) 2012 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <stdlib.h>
  25
  26 static int which_foo = 0;
  27
  28 void set_foo(int x)
  29 {
  30         which_foo = x;
  31 }
  32
  33 static int foo_ten()
  34 {
  35         return 10;
  36 }
  37
  38 static int foo_zero()
  39 {
  40         return 0;
  41 }
  42
  43
  44 // This foo is a "resolver" function that return the actual address of "foo"
  45 void* foo()
  46 {
  47         __asm__(".symbol_resolver _foo");  // magic until we have compiler support
  48         if ( which_foo == 0 )
  49                 return &foo_zero;
  50         else
  51                 return &foo_ten;
  52 }
  53