commit 2ea0a58e01c1ed6db1da9dd0314ee053f5a32026
author Elliott Hughes <enh@google.com> Fri Jul 25 17:24:00 2014 -0700
committer Elliott Hughes <enh@google.com> Tue Jul 29 10:48:34 2014 -0700
tree 63ff9d142049e6a1b1fec9945f4d21a1626550f5
parent a09fe118b1a5eb876ddaa2620965c4a8fb8b007c

Fix linkage of grantpt(3).

Also clean up the implementation of all the pty functions, add tests,
and fix the stub implementations of ttyname(3) and ttyname_r(3).

Bug: https://code.google.com/p/android/issues/detail?id=58888

(cherry picked from commit 4916706cfe590eb06c9b5bd4bd402ce056034d51)

Change-Id: I5cb7a1c17b156456e4c4818e65f256eb8d045424

libc/include/unistd.h

diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index 12e6257..82c53e8 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -170,7 +170,7 @@
 extern int optind, opterr, optopt;
 
 extern int isatty(int);
-extern char* ttyname(int);
+extern char* ttyname(int) __warnattr("ttyname is not thread-safe; use ttyname_r instead");
 extern int ttyname_r(int, char*, size_t);
 
 extern int  acct(const char*  filepath);