1 files changed, 103 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/getlogin_r.c b/REORG.TODO/sysdeps/unix/getlogin_r.c
new file mode 100644
index 0000000000..4a6a40eeb2
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/getlogin_r.c
@@ -0,0 +1,103 @@
+/* Reentrant function to return the current login name.  Unix version.
+   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>
+#include "../login/utmp-private.h"
+
+/* Return at most NAME_LEN characters of the login name of the user in NAME.
+   If it cannot be determined or some other error occurred, return the error
+   code.  Otherwise return 0.  */
+
+#ifdef STATIC
+STATIC
+#endif
+int
+__getlogin_r (char *name, size_t name_len)
+{
+  char tty_pathname[2 + 2 * NAME_MAX];
+  char *real_tty_path = tty_pathname;
+  int result;
+  struct utmp *ut, line, buffer;
+
+  /* Get name of tty connected to fd 0.  Return 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().  */
+
+  result = __ttyname_r (0, real_tty_path, sizeof (tty_pathname));
+
+  if (result != 0)
+    return result;
+
+  real_tty_path += 5;		/* Remove "/dev/".  */
+  strncpy (line.ut_line, real_tty_path, sizeof line.ut_line);
+
+  /* We don't use the normal entry points __setutent et al, because we
+     want setutent + getutline_r + endutent all to happen with the lock
+     held so that our search is thread-safe.  */
+
+  __libc_lock_lock (__libc_utmp_lock);
+  (*__libc_utmp_jump_table->setutent) ();
+  result = (*__libc_utmp_jump_table->getutline_r) (&line, &buffer, &ut);
+  if (result < 0)
+    {
+      if (errno == ESRCH)
+	/* The caller expects ENOENT if nothing is found.  */
+	result = ENOENT;
+      else
+	result = errno;
+    }
+  (*__libc_utmp_jump_table->endutent) ();
+  __libc_utmp_jump_table = &__libc_utmp_unknown_functions;
+  __libc_lock_unlock (__libc_utmp_lock);
+
+  if (result == 0)
+    {
+      size_t needed = strlen (ut->ut_user) + 1;
+
+      if (needed > name_len)
+	{
+	  __set_errno (ERANGE);
+	  result = ERANGE;
+	}
+      else
+	{
+	  memcpy (name, ut->ut_user, needed);
+	  result = 0;
+	}
+    }
+
+  return result;
+}
+#ifndef STATIC
+libc_hidden_def (__getlogin_r)
+weak_alias (__getlogin_r, getlogin_r)
+libc_hidden_weak (getlogin_r)
+#endif