unit-tests/test-cases/interpose-dynamic-dlsym/foo.c

   1 #include <stdio.h>  // fprintf(), NULL
   2 #include <stdlib.h> // exit(), EXIT_SUCCESS
   3 #include <string.h>
   4 #include <dlfcn.h>
   5 #include <crt_externs.h>
   6 #include <mach-o/dyld_priv.h>
   7
   8
   9 int foo() { return 0; }
  10
  11 int alt_foo() { return 10; }
  12
  13
  14
  15
  16 static const struct dyld_interpose_tuple sTable[] = { {&alt_foo, &foo} };
  17
  18
  19 __attribute__((constructor))
  20 void init()
  21 {
  22   // switch main executable to use alt_foo() when it calls foo()
  23   dyld_dynamic_interpose((const struct mach_header*)_NSGetMachExecuteHeader(), sTable, 1);
  24
  25 }
  26