Added function 'get_current_dir_name' for Linux Test Project. Tested and

works identically to function in glibc.

include/unistd.h

@@ -423,13 +423,10 @@ extern int fchdir (int __fd) __THROW;
    big as necessary.  */
 extern char *getcwd (char *__buf, size_t __size) __THROW;
 
-#if 0
-/*#ifdef	__USE_GNU*/
 /* Return a malloc'd string containing the current directory name.
    If the environment variable `PWD' is set, and its value is correct,
    that value is used.  */
 extern char *get_current_dir_name (void) __THROW;
-#endif
 
 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 /* Put the absolute pathname of the current working directory in BUF.

libc/sysdeps/linux/common/Makefile

@@ -34,7 +34,7 @@ CSRC=	waitpid.c getdnnm.c gethstnm.c getcwd.c \
 	wait3.c setpgrp.c getdtablesize.c create_module.c ptrace.c \
 	cmsg_nxthdr.c longjmp.c open64.c ftruncate64.c \
 	truncate64.c getrlimit64.c setrlimit64.c creat64.c mmap64.c \
-	llseek.c pread_write.c _exit.c setuid.c sync.c
+	llseek.c pread_write.c _exit.c setuid.c sync.c getdirname.c
 ifneq ($(strip $(EXCLUDE_BRK)),true)
 CSRC+=sbrk.c
 endif

libc/sysdeps/linux/common/getdirname.c

@@ -0,0 +1,45 @@
+/* vi: set sw=4 ts=4: */
+/* Copyright (C) 1992, 1997, 1998, 2000 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
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <unistd.h>
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Return a malloc'd string containing the current directory name.
+   If the environment variable `PWD' is set, and its value is correct,
+   that value is used.  */
+
+char *
+get_current_dir_name (void)
+{
+	char *pwd;
+	struct stat64 dotstat, pwdstat;
+
+	pwd = getenv ("PWD");
+	if (pwd != NULL
+		&& stat64 (".", &dotstat) == 0
+		&& stat64 (pwd, &pwdstat) == 0
+		&& pwdstat.st_dev == dotstat.st_dev
+		&& pwdstat.st_ino == dotstat.st_ino)
+		/* The PWD value is correct.  Use it.  */
+		return strdup (pwd);
+
+	return getcwd ((char *) NULL, 0);
+}