utmpname implementation.

1 files changed, 78 insertions, 0 deletions

diff --git a/login/utmpname.c b/login/utmpname.c
new file mode 100644
index 0000000000..dd54f4a80d
--- /dev/null
+++ b/login/utmpname.c
@@ -0,0 +1,78 @@
+/* Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 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 <libc-lock.h>
+#include <stdlib.h>
+#include <string.h>
+#include <utmp.h>
+
+#include "utmp-private.h"
+
+
+/* This is the default name.  */
+static const char default_file_name[] = _PATH_UTMP;
+
+/* Current file name.  */
+const char *__libc_utmp_file_name = (const char *) default_file_name;
+
+/* We have to use the lock in getutent_r.c.  */
+__libc_lock_define (extern, __libc_utmp_lock)
+
+
+int
+__utmpname (const char *file)
+{
+  int result = -1;
+
+  __libc_lock_lock (__libc_utmp_lock);
+
+  /* Close the old file.  */
+  (*__libc_utmp_jump_table->endutent) ();
+  __libc_utmp_jump_table = &__libc_utmp_unknown_functions;
+
+  if (strcmp (file, __libc_utmp_file_name) != 0)
+    {
+      if (strcmp (file, default_file_name) == 0)
+	{
+	  if (__libc_utmp_file_name != default_file_name)
+	    free ((char *) __libc_utmp_file_name);
+
+	  __libc_utmp_file_name = default_file_name;
+	}
+      else
+	{
+	  char *file_name = __strdup (file);
+	  if (file_name == NULL)
+	    /* Out of memory.  */
+	    goto done;
+
+	  if (__libc_utmp_file_name != default_file_name)
+	    free ((char *) __libc_utmp_file_name);
+
+	  __libc_utmp_file_name = file_name;
+	}
+    }
+
+  result = 0;
+
+done:
+  __libc_lock_unlock (__libc_utmp_lock);
+  return result;
+}
+weak_alias (__utmpname, utmpname)