1 files changed, 43 insertions, 0 deletions
diff --git a/coreutils/logname.c b/coreutils/logname.c
new file mode 100644
index 0000000..3400c30
--- /dev/null
+++ b/coreutils/logname.c
@@ -0,0 +1,43 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini logname implementation for busybox
+ *
+ * Copyright (C) 2000  Edward Betts <edward@debian.org>.
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+/* BB_AUDIT SUSv3 compliant */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/logname.html */
+
+/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
+ *
+ * SUSv3 specifies the string used is that returned from getlogin().
+ * The previous implementation used getpwuid() for geteuid(), which
+ * is _not_ the same.  Erik apparently made this change almost 3 years
+ * ago to avoid failing when no utmp was available.  However, the
+ * correct course of action wrt SUSv3 for a failing getlogin() is
+ * a diagnostic message and an error return.
+ */
+
+#include "libbb.h"
+
+/* This is a NOFORK applet. Be very careful! */
+
+int logname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int logname_main(int argc, char **argv UNUSED_PARAM)
+{
+	char buf[128];
+
+	if (argc > 1) {
+		bb_show_usage();
+	}
+
+	/* Using _r function - avoid pulling in static buffer from libc */
+	if (getlogin_r(buf, sizeof(buf)) == 0) {
+		puts(buf);
+		return fflush(stdout);
+	}
+
+	bb_perror_msg_and_die("getlogin");
+}