1 files changed, 81 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/getlogin.c b/REORG.TODO/sysdeps/unix/getlogin.c
new file mode 100644
index 0000000000..7d4ff53ba4
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/getlogin.c
@@ -0,0 +1,81 @@
+/* Copyright (C) 1991-2017 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <limits.h>
+#include <fcntl.h>
+
+#include <utmp.h>
+
+static char name[UT_NAMESIZE + 1];
+
+/* Return the login name of the user, or NULL if it can't be determined.
+   The returned pointer, if not NULL, is good only until the next call.  */
+
+#ifdef STATIC
+STATIC
+#endif
+char *
+getlogin (void)
+{
+  char tty_pathname[2 + 2 * NAME_MAX];
+  char *real_tty_path = tty_pathname;
+  int err;
+  char *result = NULL;
+  struct utmp *ut, line, buffer;
+
+  /* Get name of tty connected to fd 0.  Return NULL if not a tty or
+     if fd 0 isn't open.  Note that a lot of documentation says that
+     getlogin() is based on the controlling terminal---what they
+     really mean is "the terminal connected to standard input".  The
+     getlogin() implementation of DEC Unix, SunOS, Solaris, HP-UX all
+     return NULL if fd 0 has been closed, so this is the compatible
+     thing to do.  Note that ttyname(open("/dev/tty")) on those
+     systems returns /dev/tty, so that is not a possible solution for
+     getlogin().  */
+  err = __ttyname_r (0, real_tty_path, sizeof (tty_pathname));
+  if (err != 0)
+    {
+      __set_errno (err);
+      return NULL;
+    }
+
+  real_tty_path += 5;		/* Remove "/dev/".  */
+
+  __setutent ();
+  strncpy (line.ut_line, real_tty_path, sizeof line.ut_line);
+  if (__getutline_r (&line, &buffer, &ut) < 0)
+    {
+      if (errno == ESRCH)
+	/* The caller expects ENOENT if nothing is found.  */
+	__set_errno (ENOENT);
+      result = NULL;
+    }
+  else
+    {
+      strncpy (name, ut->ut_user, UT_NAMESIZE);
+      name[UT_NAMESIZE] = '\0';
+      result = name;
+    }
+
+  __endutent ();
+
+  return result;
+}