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Diffstat (limited to 'coreutils/logname.c')
-rw-r--r--coreutils/logname.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/coreutils/logname.c b/coreutils/logname.c
new file mode 100644
index 000000000..695a736c6
--- /dev/null
+++ b/coreutils/logname.c
@@ -0,0 +1,42 @@
+/* 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 <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "busybox.h"
+
+int logname_main(int argc, char ATTRIBUTE_UNUSED **argv)
+{
+ const char *p;
+
+ if (argc > 1) {
+ bb_show_usage();
+ }
+
+ if ((p = getlogin()) != NULL) {
+ puts(p);
+ fflush_stdout_and_exit(EXIT_SUCCESS);
+ }
+
+ bb_perror_msg_and_die("getlogin");
+}