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-rw-r--r--src/systemctl/systemctl-compat-runlevel.c82
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;
+}