1 files changed, 135 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/getcwd.c b/REORG.TODO/sysdeps/unix/sysv/linux/getcwd.c
new file mode 100644
index 0000000000..3b556fd450
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/sysv/linux/getcwd.c
@@ -0,0 +1,135 @@
+/* Determine current working directory.  Linux version.
+   Copyright (C) 1997-2017 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 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <assert.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/param.h>
+
+#include <sysdep.h>
+#include <sys/syscall.h>
+
+
+/* If we compile the file for use in ld.so we don't need the feature
+   that getcwd() allocates the buffers itself.  */
+#if IS_IN (rtld)
+# define NO_ALLOCATION	1
+#endif
+
+
+/* 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) internal_function;
+
+char *
+__getcwd (char *buf, size_t size)
+{
+  char *path;
+  char *result;
+
+#ifndef NO_ALLOCATION
+  size_t alloc_size = size;
+  if (size == 0)
+    {
+      if (buf != NULL)
+	{
+	  __set_errno (EINVAL);
+	  return NULL;
+	}
+
+      alloc_size = MAX (PATH_MAX, __getpagesize ());
+    }
+
+  if (buf == NULL)
+    {
+      path = malloc (alloc_size);
+      if (path == NULL)
+	return NULL;
+    }
+  else
+#else
+# define alloc_size size
+#endif
+    path = buf;
+
+  int retval;
+
+  retval = INLINE_SYSCALL (getcwd, 2, path, alloc_size);
+  if (retval >= 0)
+    {
+#ifndef NO_ALLOCATION
+      if (buf == NULL && size == 0)
+	/* Ensure that the buffer is only as large as necessary.  */
+	buf = realloc (path, (size_t) retval);
+
+      if (buf == NULL)
+	/* Either buf was NULL all along, or `realloc' failed but
+	   we still have the original string.  */
+	buf = path;
+#endif
+
+      return buf;
+    }
+
+  /* The system call cannot handle paths longer than a page.
+     Neither can the magic symlink in /proc/self.  Just use the
+     generic implementation right away.  */
+  if (errno == ENAMETOOLONG)
+    {
+#ifndef NO_ALLOCATION
+      if (buf == NULL && size == 0)
+	{
+	  free (path);
+	  path = NULL;
+	}
+#endif
+
+      result = generic_getcwd (path, size);
+
+#ifndef NO_ALLOCATION
+      if (result == NULL && buf == NULL && size != 0)
+	free (path);
+#endif
+
+      return result;
+    }
+
+  /* It should never happen that the `getcwd' syscall failed because
+     the buffer is too small if we allocated the buffer ourselves
+     large enough.  */
+  assert (errno != ERANGE || buf != NULL || size != 0);
+
+#ifndef NO_ALLOCATION
+  if (buf == NULL)
+    free (path);
+#endif
+
+  return NULL;
+}
+weak_alias (__getcwd, getcwd)
+
+/* Get the code for the generic version.  */
+#define GETCWD_RETURN_TYPE	static char * internal_function
+#define __getcwd		generic_getcwd
+#include <sysdeps/posix/getcwd.c>