1 files changed, 94 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/getcwd.c b/sysdeps/unix/sysv/linux/getcwd.c
new file mode 100644
index 0000000000..eea0b469e1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/getcwd.c
@@ -0,0 +1,94 @@
+/* Determine current working directory.  Linux version.
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/* #define NDEBUG 1 */
+#include <assert.h>
+
+/* The "proc" filesystem provides an easy method to retrieve the value.
+   For each process, the corresponding directory contains a symbolic link
+   named `cwd'.  Reading the content of this link immediate gives us the
+   information.  But we have to take care for systems which do not have
+   the proc filesystem mounted.  Use the POSIX implementation in this case.  */
+static char *generic_getcwd (char *buf, size_t size);
+
+char *
+__getcwd (char *buf, size_t size)
+{
+  int save_errno;
+  char *path;
+  int n;
+  char *result;
+
+  if (size == 0)
+    {
+      if (buf != NULL)
+	{
+	  __set_errno (EINVAL);
+	  return NULL;
+	}
+
+      size = PATH_MAX + 1;
+    }
+
+  if (buf != NULL)
+    path = buf;
+  else
+    {
+      path = malloc (size);
+      if (path == NULL)
+	return NULL;
+    }
+
+  save_errno = errno;
+  n = __readlink ("/proc/self/cwd", path, size);
+  if (n != -1)
+    {
+      if (n >= size)
+	{
+	  /* This should never happen when we allocate the buffer here.  */
+	  assert (buf == NULL);
+	  __set_errno (ERANGE);
+	  return NULL;
+	}
+      path[n] = '\0';
+      return buf ?: (char *) realloc (path, (size_t) n + 1);
+    }
+
+  /* Something went wrong.  Restore the error number and use the generic
+     version.  */
+  __set_errno (save_errno);
+  result = generic_getcwd (path, size);
+
+  if (result == NULL && buf == NULL)
+    free (path);
+
+  return result;
+}
+weak_alias (__getcwd, getcwd)
+
+/* Get the code for the generic version.  */
+#define GETCWD_STORAGE_CLASS	static
+#define __getcwd		generic_getcwd
+#include <sysdeps/posix/getcwd.c>