add ability for openrc-shutdown to communicate with sysvinit

This fixes #315.

1 files changed, 71 insertions, 0 deletions

diff --git a/src/rc/rc-sysvinit.h b/src/rc/rc-sysvinit.h
new file mode 100644
index 00000000..55bc434d
--- /dev/null
+++ b/src/rc/rc-sysvinit.h
@@ -0,0 +1,71 @@
+/*
+ * rc-sysvinit.h	- Interface to communicate with sysvinit via /run/initctl.
+ */
+
+/*
+ * Copyright (c) 2019 The OpenRC Authors.
+ * See the Authors file at the top-level directory of this distribution and
+ * https://github.com/OpenRC/openrc/blob/master/AUTHORS
+ *
+ * This file is part of OpenRC. It is subject to the license terms in
+ * the LICENSE file found in the top-level directory of this
+ * distribution and at https://github.com/OpenRC/openrc/blob/master/LICENSE
+ * This file may not be copied, modified, propagated, or distributed
+ *    except according to the terms contained in the LICENSE file.
+ */
+
+#ifndef _RC_SYSVINIT_H
+#define _RC_SYSVINIT_H
+
+/*
+ * The #defines and structures below are taken from initreq.h in
+ * sysvinit and must be used by any program wishing to communicate with
+ * it.
+ */
+
+#define INIT_MAGIC 0x03091969
+#define INIT_CMD_START		0
+#define INIT_CMD_RUNLVL		1
+#define INIT_CMD_POWERFAIL	2
+#define INIT_CMD_POWERFAILNOW	3
+#define INIT_CMD_POWEROK	4
+#define INIT_CMD_BSD		5
+#define INIT_CMD_SETENV		6
+#define INIT_CMD_UNSETENV	7
+
+/*
+ *	This is what BSD 4.4 uses when talking to init.
+ *	Linux doesn't use this right now.
+ */
+struct init_request_bsd {
+	char	gen_id[8];		/* Beats me.. telnetd uses "fe" */
+	char	tty_id[16];		/* Tty name minus /dev/tty      */
+	char	host[64];	/* Hostname                     */
+	char	term_type[16];		/* Terminal type                */
+	int	signal;			/* Signal to send               */
+	int	pid;			/* Process to send to           */
+	char	exec_name[128];	        /* Program to execute           */
+	char	reserved[128];		/* For future expansion.        */
+};
+
+/*
+ *	Because of legacy interfaces, "runlevel" and "sleeptime"
+ *	aren't in a seperate struct in the union.
+ *
+ *	The weird sizes are because init expects the whole
+ *	struct to be 384 bytes.
+ */
+struct init_request {
+	int	magic;			/* Magic number                 */
+	int	cmd;			/* What kind of request         */
+	int	runlevel;		/* Runlevel to change to        */
+	int	sleeptime;		/* Time between TERM and KILL   */
+	union {
+		struct init_request_bsd	bsd;
+		char			data[368];
+	} i;
+};
+
+void sysvinit_runlevel(char rl);
+
+#endif