Endian sanity check

[fio.git] / fio.c

diff --git a/fio.c b/fio.c
index 3e4dbb749fd97d9a7af718d27a22d5cc15cb749c..61ef88b315eb6da4ace155967d8f1bce19eee716 100644 (file)
--- a/fio.c
+++ b/fio.c
@@ -1761,10 +1761,46 @@ void reset_fio_state(void)
        done_secs = 0;
 }
 
+static int endian_check(void)
+{
+       union {
+               uint8_t c[8];
+               uint64_t v;
+       } u;
+       int le = 0, be = 0;
+
+       u.v = 0x12;
+       if (u.c[7] == 0x12)
+               be = 1;
+       else if (u.c[0] == 0x12)
+               le = 1;
+
+#if defined(FIO_LITTLE_ENDIAN)
+       if (be)
+               return 1;
+#elif defined(FIO_BIG_ENDIAN)
+       if (le)
+               return 1;
+#else
+       return 1;
+#endif
+
+       if (!le && !be)
+               return 1;
+
+       return 0;
+}
+
 int main(int argc, char *argv[], char *envp[])
 {
        long ps;
 
+       if (endian_check()) {
+               log_err("fio: endianness settings appear wrong.\n");
+               log_err("fio: please report this to fio@vger.kernel.org\n");
+               return 1;
+       }
+
        arch_init(envp);
 
        sinit();