6-3 バイトオーダーを知る

#include <stdio.h>
#include <sys/types.h>

int
main()
{
#ifdef __BYTE_ORDER
# if __BYTE_ORDER == __BIG_ENDIAN
  char *endianstr = "big endian\n";
# elif __BYTE_ORDER == __LITTLE_ENDIAN
  char *endianstr = "little endian\n";
# else
  unknown endian, gcc will fail here.
# endif
#else // __BYTE_ORDER not defined
  error !
#endif

  printf("%s\n", endianstr);

  return 0;
}

拙著「Linuxネットワークプログラミング」の紹介