Bitcoin Core  0.19.99
P2P Digital Currency
glibc_sanity.cpp
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1 // Copyright (c) 2009-2019 The Bitcoin Core developers
2 // Distributed under the MIT software license, see the accompanying
3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 
5 #if defined(HAVE_CONFIG_H)
7 #endif
8 
9 #include <cstddef>
10 
11 #if defined(HAVE_SYS_SELECT_H)
12 bool sanity_test_fdelt();
13 #endif
14 
15 extern "C" void* memcpy(void* a, const void* b, size_t c);
16 void* memcpy_int(void* a, const void* b, size_t c)
17 {
18  return memcpy(a, b, c);
19 }
20 
21 namespace
22 {
23 // trigger: Use the memcpy_int wrapper which calls our internal memcpy.
24 // A direct call to memcpy may be optimized away by the compiler.
25 // test: Fill an array with a sequence of integers. memcpy to a new empty array.
26 // Verify that the arrays are equal. Use an odd size to decrease the odds of
27 // the call being optimized away.
28 template <unsigned int T>
29 bool sanity_test_memcpy()
30 {
31  unsigned int memcpy_test[T];
32  unsigned int memcpy_verify[T] = {};
33  for (unsigned int i = 0; i != T; ++i)
34  memcpy_test[i] = i;
35 
36  memcpy_int(memcpy_verify, memcpy_test, sizeof(memcpy_test));
37 
38  for (unsigned int i = 0; i != T; ++i) {
39  if (memcpy_verify[i] != i)
40  return false;
41  }
42  return true;
43 }
44 } // namespace
45 
47 {
48 #if defined(HAVE_SYS_SELECT_H)
49  if (!sanity_test_fdelt())
50  return false;
51 #endif
52  return sanity_test_memcpy<1025>();
53 }
void * memcpy_int(void *a, const void *b, size_t c)
bool glibc_sanity_test()
void * memcpy(void *a, const void *b, size_t c)