Misc: lifemngr-daemon-on-UOS

For cross-VM S5 notify via vUART, life_mngr service is running on UOS.
It is listening on /dev/ttyS1 to get SOS's commands.
The protocol is: SOS send "shutdown", UOS feedback "acked".

When SOS triggle shutdown, SOS can 1) check VM's status until UOS
stopped, 2) retry shutdown UOS normally with timeout.
So, no matter life_mngr server is running, SOS's shutdown procedure will
properly finish.

Tracked-On: #3564
Signed-off-by: fuyanX <yanx.fu@intel.com>
Acked-by: Yan, Like <like.yan@intel.com>

Author: fuyanX

misc/life_mngr/life_mngr.c

@@ -0,0 +1,113 @@
+/*
+ * Copyright (C)2019 Intel Corporation
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <unistd.h>
+
+#define SOS_REQ		"shutdown"
+#define UOS_ACK		"acked"
+#define BUFF_SIZE	16U
+#define MSG_SIZE	8U
+#define NODE_SIZE	3U
+
+enum nodetype {
+	NODE_UNKNOWN = 0,
+	NODE_UOS_SERVER,
+	NODE_SOS_CLIENT,
+};
+
+int set_serial_interface_attributes(int fd, int speed)
+{
+	struct termios tty;
+
+	if (tcgetattr(fd, &tty) < 0) {
+		printf("Error from tcgetattr: %s\n", strerror(errno));
+		return errno;
+	}
+
+	cfsetospeed(&tty, (speed_t)speed);
+	cfsetispeed(&tty, (speed_t)speed);
+
+	/* set input-mode */
+	tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
+
+	/* set output-mode */
+	tty.c_oflag &= ~OPOST;
+
+	/* set control-mode */
+	tty.c_cflag |= (CLOCAL | CREAD);
+	tty.c_cflag &= ~CSIZE;
+	tty.c_cflag |= CS8;
+	tty.c_cflag &= ~PARENB;
+	tty.c_cflag &= ~CSTOPB;
+	tty.c_cflag &= ~CRTSCTS;
+
+	/* set local-mode */
+	tty.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
+
+	/* block until one char read, set next char's timeout */
+	tty.c_cc[VMIN] = 1;
+	tty.c_cc[VTIME] = 1;
+
+	if (tcsetattr(fd, TCSANOW, &tty) != 0) {
+		printf("Error from tcsetattr: %s\n", strerror(errno));
+		return errno;
+	}
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	char *devname_uos = "";
+	int fd_uos = 0;
+	unsigned char recvbuf[BUFF_SIZE];
+	enum nodetype node = NODE_UNKNOWN;
+
+	if (argc <= 2) {
+		printf("Too few options. Example: [./life_mngr uos /dev/ttyS1].\n");
+		return -EINVAL;
+	}
+
+	if (strncmp("uos", argv[1], NODE_SIZE) == 0) {
+		node = NODE_UOS_SERVER;
+	} else if (strncmp("sos", argv[1], NODE_SIZE) == 0) {
+		node = NODE_SOS_CLIENT;
+	} else {
+		printf("Invalid param. Example: [./life_mngr uos /dev/ttyS1].\n");
+		return -EINVAL;
+	}
+
+	if (node == NODE_UOS_SERVER) {
+		devname_uos = argv[2];
+		fd_uos = open(devname_uos, O_RDWR | O_NOCTTY | O_SYNC);
+		if (fd_uos < 0) {
+			printf("Error opening %s: %s\n", devname_uos, strerror(errno));
+			return errno;
+		}
+		set_serial_interface_attributes(fd_uos, B115200);
+	}
+
+	/* UOS-server wait for shutdown from SOS */
+	do {
+		if (node == NODE_UOS_SERVER) {
+			memset(recvbuf, 0, sizeof(recvbuf));
+			read(fd_uos, recvbuf, sizeof(recvbuf));
+
+			if (strncmp(SOS_REQ, recvbuf, MSG_SIZE) == 0) {
+				write(fd_uos, UOS_ACK, sizeof(UOS_ACK));
+				printf("SOS start shutdown\n");
+				system("poweroff");
+				break;
+			}
+		}
+	} while (1);
+
+	return 0;
+}

misc/life_mngr/life_mngr.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=ACRN lifemngr daemon
+After=systemd-resolved.service
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/life_mngr uos /dev/ttyS1
+StandardOutput=journal
+StandardError=journal
+Restart=yes
+
+[Install]
+WantedBy=multi-user.target