From 0ecb606cb6cf65de1d9fc8a919bceb4be476c602 Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Thu, 12 Jul 2007 18:26:36 +0000
Subject: 2.5-18.1

---
 sysdeps/unix/sysv/linux/ttyname_r.c | 32 +++++++++++++++++++-------------
 1 file changed, 19 insertions(+), 13 deletions(-)

(limited to 'sysdeps/unix/sysv/linux/ttyname_r.c')

diff --git a/sysdeps/unix/sysv/linux/ttyname_r.c b/sysdeps/unix/sysv/linux/ttyname_r.c
index eee4d862b2..cef8624dc6 100644
--- a/sysdeps/unix/sysv/linux/ttyname_r.c
+++ b/sysdeps/unix/sysv/linux/ttyname_r.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991,92,93,1995-2001, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 1991,92,93,1995-2001,2003,2006 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -22,18 +22,20 @@
 #include <dirent.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <termios.h>
 #include <unistd.h>
 #include <string.h>
 #include <stdlib.h>
 
 #include <stdio-common/_itoa.h>
+#include <kernel-features.h>
 
 static int getttyname_r (char *buf, size_t buflen,
 			 dev_t mydev, ino64_t myino, int save,
 			 int *dostat) internal_function;
 
 static int
-internal_function
+internal_function attribute_compat_text_section
 getttyname_r (char *buf, size_t buflen, dev_t mydev, ino64_t myino,
 	      int save, int *dostat)
 {
@@ -99,7 +101,6 @@ __ttyname_r (int fd, char *buf, size_t buflen)
   struct stat64 st, st1;
   int dostat = 0;
   int save = errno;
-  int ret;
 
   /* Test for the absolute minimal size.  This makes life easier inside
      the loop.  */
@@ -115,29 +116,34 @@ __ttyname_r (int fd, char *buf, size_t buflen)
       return ERANGE;
     }
 
+  /* isatty check, tcgetattr is used because it sets the correct
+     errno (EBADF resp. ENOTTY) on error.  */
+  struct termios term;
+  if (__builtin_expect (__tcgetattr (fd, &term) < 0, 0))
+    return errno;
+
   /* We try using the /proc filesystem.  */
   *_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';
 
-  ret = __readlink (procname, buf, buflen - 1);
-  if (ret == -1 && errno == ENOENT)
+  ssize_t ret = __readlink (procname, buf, buflen - 1);
+  if (__builtin_expect (ret == -1 && errno == ENOENT, 0))
     {
       __set_errno (EBADF);
       return EBADF;
     }
 
-  if (!__isatty (fd))
-    {
-      __set_errno (ENOTTY);
-      return ENOTTY;
-    }
-
-  if (ret == -1 && errno == ENAMETOOLONG)
+  if (__builtin_expect (ret == -1 && errno == ENAMETOOLONG, 0))
     {
       __set_errno (ERANGE);
       return ERANGE;
     }
 
-  if (ret != -1 && buf[0] != '[')
+  if (__builtin_expect (ret != -1
+#ifndef __ASSUME_PROC_SELF_FD_SYMLINK
+			/* This is for Linux 2.0.  */
+			&& buf[0] != '['
+#endif
+			, 1))
     {
       buf[ret] = '\0';
       return 0;
-- 
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