1 files changed, 82 insertions, 0 deletions
diff --git a/src/systemctl/systemctl-compat-runlevel.c b/src/systemctl/systemctl-compat-runlevel.c
new file mode 100644
index 0000000..04b6b76
--- /dev/null
+++ b/src/systemctl/systemctl-compat-runlevel.c
@@ -0,0 +1,82 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <getopt.h>
+
+#include "alloc-util.h"
+#include "pretty-print.h"
+#include "systemctl-compat-runlevel.h"
+#include "systemctl.h"
+#include "terminal-util.h"
+#include "utmp-wtmp.h"
+
+static int runlevel_help(void) {
+        _cleanup_free_ char *link = NULL;
+        int r;
+
+        r = terminal_urlify_man("runlevel", "8", &link);
+        if (r < 0)
+                return log_oom();
+
+        printf("%s [OPTIONS...]\n"
+               "\n%sPrints the previous and current runlevel of the init system.%s\n"
+               "\nOptions:\n"
+               "     --help      Show this help\n"
+               "\nSee the %s for details.\n",
+               program_invocation_short_name,
+               ansi_highlight(),
+               ansi_normal(),
+               link);
+
+        return 0;
+}
+
+int runlevel_parse_argv(int argc, char *argv[]) {
+        enum {
+                ARG_HELP = 0x100,
+        };
+
+        static const struct option options[] = {
+                { "help",      no_argument,       NULL, ARG_HELP    },
+                {}
+        };
+
+        int c;
+
+        assert(argc >= 0);
+        assert(argv);
+
+        while ((c = getopt_long(argc, argv, "", options, NULL)) >= 0)
+                switch (c) {
+
+                case ARG_HELP:
+                        return runlevel_help();
+
+                case '?':
+                        return -EINVAL;
+
+                default:
+                        assert_not_reached();
+                }
+
+        if (optind < argc)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "Too many arguments.");
+
+        return 1;
+}
+
+int runlevel_main(void) {
+        int r, runlevel, previous;
+
+        r = utmp_get_runlevel(&runlevel, &previous);
+        if (r < 0) {
+                puts("unknown");
+                return r;
+        }
+
+        printf("%c %c\n",
+               previous <= 0 ? 'N' : previous,
+               runlevel <= 0 ? 'N' : runlevel);
+
+        return 0;
+}