1 files changed, 66 insertions, 0 deletions
diff --git a/src/rc/rc-sysvinit.c b/src/rc/rc-sysvinit.c
new file mode 100644
index 00000000..d9d17146
--- /dev/null
+++ b/src/rc/rc-sysvinit.c
@@ -0,0 +1,66 @@
+/*
+ * rc-sysvinit.c
+ * Helper to send a runlevel change to sysvinit
+ */
+
+/*
+ * 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.
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "einfo.h"
+#include "rc-sysvinit.h"
+
+void sysvinit_runlevel(char rl)
+{
+	struct init_request request;
+	int fd;
+	char *p;
+	size_t bytes;
+	ssize_t r;
+
+	if (!rl)
+		return;
+
+	fd = open("/run/initctl", O_WRONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY);
+	if (fd < 0) {
+		if (errno != ENOENT)
+			eerror("Failed to open initctl fifo: %s", strerror(errno));
+		return;
+	}
+	request = (struct init_request) {
+		.magic = INIT_MAGIC,
+		.sleeptime = 0,
+		.cmd = INIT_CMD_RUNLVL,
+		.runlevel = rl,
+	};
+	p = (char *) &request;
+	bytes = sizeof(request);
+	do {
+		r = write(fd, p, bytes);
+		if (r < 0) {
+			if ((errno == EAGAIN) || (errno == EINTR))
+				continue;
+			eerror("Failed to write to /run/initctl: %s", strerror(errno));
+			return;
+		}
+		p += r;
+		bytes -= r;
+	} while (bytes > 0);
+	exit(0);
+}