Add in a trivial getlogin implementation

libc/unistd/getlogin.c

@@ -0,0 +1,48 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * getlogin for uClibc
+ *
+ * Copyright (C) 2001 by Lineo, inc.  Written by 
+ *    Erik Andersen * <andersen@lineo.com>, <andersee@debian.org>
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+/* uClibc makes it policy to not mess with the utmp file whenever possible, *
+ * since I consider utmp a complete wasts of time.  Since getlogin() should
+ * never be used for security purposes, we kindly let the user specify whatever
+ * they want via the LOGNAME environment variable, or we return NULL if
+ * getenv() fails to find anything */
+
+char * getlogin(void)
+{
+	return (getenv("LOGNAME"));
+}
+
+int getlogin_r(char *name, size_t len)
+{
+	char * foo = getenv("LOGNAME");
+
+	if (! foo)
+		return -1;
+
+	strncpy(name, foo, len);
+	return 0;
+}
+