text: // Copyright (c) 2009-2014 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #if defined(HAVE_CONFIG_H)
  #include "config/qureno-config.h"
  #endif
  
  #include <cstddef>
  
  #if defined(HAVE_SYS_SELECT_H)
  #include <sys/select.h>
  #endif
  
  // Prior to GLIBC_2.14, memcpy was aliased to memmove.
  extern "C" void* memmove(void* a, const void* b, size_t c);
  extern "C" void* memcpy(void* a, const void* b, size_t c)
  {
      return memmove(a, b, c);
  }
  
  extern "C" void __chk_fail(void) __attribute__((__noreturn__));
  extern "C" FDELT_TYPE __fdelt_warn(FDELT_TYPE a)
  {
      if (a >= FD_SETSIZE)
          __chk_fail();
      return a / __NFDBITS;
  }
  extern "C" FDELT_TYPE __fdelt_chk(FDELT_TYPE) __attribute__((weak, alias("__fdelt_warn")));
  