Merge "set errno to ENOENT in getauxval per glibc 2.19"

libc/bionic/getauxval.cpp

@@ -31,6 +31,7 @@
 #include <sys/auxv.h>
 #include <private/bionic_auxv.h>
 #include <elf.h>
+#include <errno.h>
 
 __LIBC_HIDDEN__ ElfW(auxv_t)* __libc_auxv = NULL;
 
@@ -40,5 +41,6 @@ extern "C" unsigned long int getauxval(unsigned long int type) {
       return v->a_un.a_val;
     }
   }
+  errno = ENOENT;
   return 0;
 }

tests/getauxval_test.cpp

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <errno.h>
 #include <sys/cdefs.h>
 #include <gtest/gtest.h>
 
@@ -53,7 +54,9 @@ TEST(getauxval, expected_values) {
 
 TEST(getauxval, unexpected_values) {
 #if defined(GETAUXVAL_CAN_COMPILE)
+  errno = 0;
   ASSERT_EQ((unsigned long int) 0, getauxval(0xdeadbeef));
+  ASSERT_EQ(ENOENT, errno);
 #else
   GTEST_LOG_(INFO) << "This test does nothing.\n";
 #endif