--- linux-2.6.11-rc1/include/linux/sysctl.h	2005-01-14 12:35:58 +0100
+++ linux-2.6.11-rc1-vs1.9.4-rc2/include/linux/sysctl.h	2005-01-15 12:07:27 +0100
@@ -135,6 +135,7 @@ enum
 	KERN_HZ_TIMER=65,	/* int: hz timer on or off */
 	KERN_UNKNOWN_NMI_PANIC=66, /* int: unknown nmi panic flag */
 	KERN_BOOTLOADER_TYPE=67, /* int: boot loader type */
+	KERN_VSHELPER=68,	/* string: path to vshelper policy agent */
 };
 
 
--- linux-2.6.11-rc1/kernel/sys.c	2005-01-14 12:36:01 +0100
+++ linux-2.6.11-rc1-vs1.9.4-rc2/kernel/sys.c	2005-01-15 12:54:14 +0100
@@ -356,6 +363,7 @@ out_unlock:
 	return retval;
 }
 
+long vs_reboot(unsigned int, void *);
 
 /*
  * Reboot system call: for obvious reasons only root may call it,
--- linux-2.6.11-rc1/kernel/sys.c	2005-01-14 12:36:01 +0100
+++ linux-2.6.11-rc1-vs1.9.4-rc2/kernel/sys.c	2005-01-15 12:54:14 +0100
@@ -381,6 +389,9 @@ asmlinkage long sys_reboot(int magic1, i
 	                magic2 != LINUX_REBOOT_MAGIC2C))
 		return -EINVAL;
 
+	if (!vx_check(0, VX_ADMIN|VX_WATCH))
+		return vs_reboot(cmd, arg);
+
 	lock_kernel();
 	switch (cmd) {
 	case LINUX_REBOOT_CMD_RESTART:
--- linux-2.6.11-rc1/kernel/sysctl.c	2005-01-14 12:36:01 +0100
+++ linux-2.6.11-rc1-vs1.9.4-rc2/kernel/sysctl.c	2005-01-15 11:27:52 +0100
@@ -85,6 +85,7 @@ extern char modprobe_path[];
 #ifdef CONFIG_HOTPLUG
 extern char hotplug_path[];
 #endif
+extern char vshelper_path[];
 #ifdef CONFIG_CHR_DEV_SG
 extern int sg_big_buff;
 #endif
--- linux-2.6.11-rc1/kernel/sysctl.c	2005-01-14 12:36:01 +0100
+++ linux-2.6.11-rc1-vs1.9.4-rc2/kernel/sysctl.c	2005-01-15 11:27:52 +0100
@@ -399,6 +400,15 @@ static ctl_table kern_table[] = {
 		.strategy	= &sysctl_string,
 	},
 #endif
+	{
+		.ctl_name	= KERN_VSHELPER,
+		.procname	= "vshelper",
+		.data		= &vshelper_path,
+		.maxlen		= 256,
+		.mode		= 0644,
+		.proc_handler	= &proc_dostring,
+		.strategy	= &sysctl_string,
+	},
 #ifdef CONFIG_CHR_DEV_SG
 	{
 		.ctl_name	= KERN_SG_BIG_BUFF,
--- linux-2.6.11-rc1/kernel/vserver/helper.c	1970-01-01 01:00:00 +0100
+++ linux-2.6.11-rc1-vs1.9.4-rc2/kernel/vserver/helper.c	2005-01-15 11:27:52 +0100
@@ -0,0 +1,122 @@
+/*
+ *  linux/kernel/vserver/helper.c
+ *
+ *  Virtual Context Support
+ *
+ *  Copyright (C) 2004  Herbert Pötzl
+ *
+ *  V0.01  basic helper
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/reboot.h>
+#include <linux/kmod.h>
+#include <linux/sched.h>
+#include <linux/vs_context.h>
+
+#include <asm/uaccess.h>
+#include <asm/unistd.h>
+
+
+char vshelper_path[255] = "/sbin/vshelper";
+
+
+/*
+ *      vshelper path is set via /proc/sys
+ *      invoked by vserver sys_reboot(), with
+ *      the following arguments
+ *
+ *      argv [0] = vshelper_path;
+ *      argv [1] = action: "restart", "halt", "poweroff", ...
+ *      argv [2] = context identifier
+ *      argv [3] = additional argument (restart2)
+ *
+ *      envp [*] = type-specific parameters
+ */
+
+long vs_reboot(unsigned int cmd, void * arg)
+{
+	char id_buf[8], cmd_buf[32];
+	char uid_buf[32], pid_buf[32];
+	char buffer[256];
+
+	char *argv[] = {vshelper_path, NULL, id_buf, NULL, 0};
+	char *envp[] = {"HOME=/", "TERM=linux",
+			"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
+			uid_buf, pid_buf, cmd_buf, 0};
+
+	snprintf(id_buf, sizeof(id_buf)-1, "%d", vx_current_xid());
+
+	snprintf(cmd_buf, sizeof(cmd_buf)-1, "VS_CMD=%08x", cmd);
+	snprintf(uid_buf, sizeof(uid_buf)-1, "VS_UID=%d", current->uid);
+	snprintf(pid_buf, sizeof(pid_buf)-1, "VS_PID=%d", current->pid);
+
+	switch (cmd) {
+	case LINUX_REBOOT_CMD_RESTART:
+		argv[1] = "restart";
+		break;
+
+	case LINUX_REBOOT_CMD_HALT:
+		argv[1] = "halt";
+		break;
+
+	case LINUX_REBOOT_CMD_POWER_OFF:
+		argv[1] = "poweroff";
+		break;
+
+	case LINUX_REBOOT_CMD_SW_SUSPEND:
+		argv[1] = "swsusp";
+		break;
+
+	case LINUX_REBOOT_CMD_RESTART2:
+		if (strncpy_from_user(&buffer[0], (char *)arg, sizeof(buffer) - 1) < 0)
+			return -EFAULT;
+		argv[3] = buffer;
+	default:
+		argv[1] = "restart2";
+		break;
+	}
+
+	/* maybe we should wait ? */
+	if (call_usermodehelper(*argv, argv, envp, 0)) {
+		printk( KERN_WARNING
+			"vs_reboot(): failed to exec (%s %s %s %s)\n",
+			vshelper_path, argv[1], argv[2], argv[3]);
+		return -EPERM;
+	}
+	return 0;
+}
+
+long vs_context_state(unsigned int cmd)
+{
+	char id_buf[8], cmd_buf[32];
+
+	char *argv[] = {vshelper_path, NULL, id_buf, NULL, 0};
+	char *envp[] = {"HOME=/", "TERM=linux",
+			"PATH=/sbin:/usr/sbin:/bin:/usr/bin", cmd_buf, 0};
+
+	snprintf(id_buf, sizeof(id_buf)-1, "%d", vx_current_xid());
+	snprintf(cmd_buf, sizeof(cmd_buf)-1, "VS_CMD=%08x", cmd);
+
+	switch (cmd) {
+	case VS_CONTEXT_CREATED:
+		argv[1] = "startup";
+		break;
+	case VS_CONTEXT_DESTROY:
+		argv[1] = "shutdown";
+		break;
+	default:
+		return 0;
+	}
+
+	if (call_usermodehelper(*argv, argv, envp, 1)) {
+		printk( KERN_WARNING
+			"vs_context_state(): failed to exec (%s %s %s %s)\n",
+			vshelper_path, argv[1], argv[2], argv[3]);
+		return 0;
+	}
+	return 0;
+}
+