POSIX getlogin_r/LOGIN_NAME_MAX/TTY_NAME_MAX.

Bug: N/A
Test: ran tests
Change-Id: I97c8ecc82fb09c3fa4bb5e6f000d46f04f3d1702
diff --git a/libc/include/limits.h b/libc/include/limits.h
index 157f7a6..51f4fad 100644
--- a/libc/include/limits.h
+++ b/libc/include/limits.h
@@ -137,6 +137,8 @@
 #include <bits/posix_limits.h>
 
 #define HOST_NAME_MAX _POSIX_HOST_NAME_MAX
+#define LOGIN_NAME_MAX 256
+#define TTY_NAME_MAX 32
 
 #define _POSIX_VERSION 200809L
 #define _POSIX2_VERSION _POSIX_VERSION