new_handler.cpp 3.4 KB

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  1. /*
  2. * Copyright (C) 2011-2017 Intel Corporation. All rights reserved.
  3. *
  4. * Redistribution and use in source and binary forms, with or without
  5. * modification, are permitted provided that the following conditions
  6. * are met:
  7. *
  8. * * Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * * Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in
  12. * the documentation and/or other materials provided with the
  13. * distribution.
  14. * * Neither the name of Intel Corporation nor the names of its
  15. * contributors may be used to endorse or promote products derived
  16. * from this software without specific prior written permission.
  17. *
  18. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19. * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20. * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21. * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22. * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24. * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25. * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26. * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27. * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28. * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29. *
  30. */
  31. #include <stdlib.h>
  32. #include <new>
  33. #include "sgx_trts.h"
  34. #include "sgx_spinlock.h"
  35. #include "internal/se_cdefs.h"
  36. namespace std{
  37. static sgx_spinlock_t handler_lock = SGX_SPINLOCK_INITIALIZER;
  38. //default hanlder is NULL
  39. static new_handler new_handl = NULL;
  40. // set_new_handler()
  41. // Sets new_p as the new handler function.
  42. // The new handler function is the function that is called by functions
  43. // operator new or operator new[] when they are not successful
  44. // in an attempt to allocate memory.
  45. // Parameter
  46. // handler - a pointer to the handler to be called.
  47. // The function can make more storage available or throw an exception or terminate the program.
  48. // new_handler is a function pointer type taking no parameters and returning void.
  49. // Return Value
  50. // new_handler - The value of the current new_handler function if this has been previously set by this function
  51. // NULL -if this is the first call to set_new_handler
  52. new_handler set_new_handler(new_handler handle)
  53. {
  54. sgx_spin_lock(&handler_lock);
  55. new_handler retHandle = new_handl;
  56. if ( handle == NULL ){
  57. new_handl = NULL;
  58. } else if ( sgx_is_within_enclave((void *)handle, 0) ){
  59. //only set the handler when handler address is inside enclave
  60. new_handl = handle;
  61. }
  62. sgx_spin_unlock(&handler_lock);
  63. return retHandle;
  64. }
  65. };
  66. using namespace std;
  67. //call new_handl function when new memory failed
  68. int call_newh()
  69. {
  70. int ret = 0;
  71. sgx_spin_lock(&handler_lock);
  72. new_handler handler = new_handl;
  73. //unlock the handler here because new_handl may call set_new_handler again, will cause dead lock.
  74. sgx_spin_unlock(&handler_lock);
  75. // call new handler
  76. if ( handler != NULL ){
  77. handler();
  78. ret = 1;
  79. }
  80. return ret;
  81. }