Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/msan/if_indextoname.cc

@@ -0,0 +1,23 @@
+// RUN: %clangxx_msan -O0 %s -o %t && %run %t 2>&1
+// RUN: %clangxx_msan -O0 -D_FILE_OFFSET_BITS=64 %s -o %t && %run %t 2>&1
+// RUN: %clangxx_msan -O3 %s -o %t && %run %t 2>&1
+
+#include <assert.h>
+#include <errno.h>
+#include <net/if.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <sanitizer/msan_interface.h>
+
+int main(int argc, char *argv[]) {
+  char ifname[IF_NAMESIZE + 1];
+  assert(0 == __msan_test_shadow(ifname, sizeof(ifname)));
+  if (!if_indextoname(1, ifname)) {
+    assert(errno == ENXIO);
+    printf("No network interfaces found.\n");
+    return 0;
+  }
+  assert(strlen(ifname) + 1 <= __msan_test_shadow(ifname, sizeof(ifname)));
+  return 0;
+}