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-rw-r--r--src/compat/glibc_sanity.cpp67
1 files changed, 67 insertions, 0 deletions
diff --git a/src/compat/glibc_sanity.cpp b/src/compat/glibc_sanity.cpp
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+++ b/src/compat/glibc_sanity.cpp
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+// Copyright (c) 2009-2014 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#if defined(HAVE_CONFIG_H)
+#include "config/bitcoin-config.h"
+#endif
+
+#include <cstddef>
+#if defined(HAVE_SYS_SELECT_H)
+#include <sys/select.h>
+#endif
+
+extern "C" void* memcpy(void* a, const void* b, size_t c);
+void* memcpy_int(void* a, const void* b, size_t c)
+{
+ return memcpy(a,b,c);
+}
+
+namespace {
+// trigger: Use the memcpy_int wrapper which calls our internal memcpy.
+// A direct call to memcpy may be optimized away by the compiler.
+// test: Fill an array with a sequence of integers. memcpy to a new empty array.
+// Verify that the arrays are equal. Use an odd size to decrease the odds of
+// the call being optimized away.
+template <unsigned int T>
+bool sanity_test_memcpy()
+{
+ unsigned int memcpy_test[T];
+ unsigned int memcpy_verify[T] = {};
+ for (unsigned int i = 0; i != T; ++i)
+ memcpy_test[i] = i;
+
+ memcpy_int(memcpy_verify,memcpy_test,sizeof(memcpy_test));
+
+ for (unsigned int i = 0; i != T; ++i)
+ {
+ if(memcpy_verify[i] != i)
+ return false;
+ }
+ return true;
+}
+
+#if defined(HAVE_SYS_SELECT_H)
+// trigger: Call FD_SET to trigger __fdelt_chk. FORTIFY_SOURCE must be defined
+// as >0 and optimizations must be set to at least -O2.
+// test: Add a file descriptor to an empty fd_set. Verify that it has been
+// correctly added.
+bool sanity_test_fdelt()
+{
+ fd_set fds;
+ FD_ZERO(&fds);
+ FD_SET(0, &fds);
+ return FD_ISSET(0,&fds);
+}
+#endif
+
+} // anon namespace
+
+bool glibc_sanity_test()
+{
+#if defined(HAVE_SYS_SELECT_H)
+ if (!sanity_test_fdelt())
+ return false;
+#endif
+ return sanity_test_memcpy<1025>();
+}