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/*
* Copyright (C) 2008-2009 Tobias Brunner
* Copyright (C) 2007 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#ifndef GUEST_H
#define GUEST_H
#include <library.h>
#include <utils/enumerator.h>
typedef enum guest_state_t guest_state_t;
typedef struct guest_t guest_t;
#include "iface.h"
/**
* State of a guest (started, stopped, ...)
*/
enum guest_state_t {
/** guest kernel not running at all */
GUEST_STOPPED,
/** kernel started, but not yet available */
GUEST_STARTING,
/** guest is up and running */
GUEST_RUNNING,
/** guest has been paused */
GUEST_PAUSED,
/** guest is stopping (shutting down) */
GUEST_STOPPING,
};
/**
* string mappings for guest_state_t
*/
extern enum_name_t *guest_state_names;
/**
* Invoke function which lauches the UML guest.
*
* Consoles are all set to NULL, you may change them by adding additional UML
* options to args before invocation.
*
* @param data callback data
* @param guest guest to start
* @param args args to use for guest invocation, args[0] is kernel
* @param argc number of elements in args
* @param idle
* @return PID of child, 0 if failed
*/
typedef pid_t (*invoke_function_t)(void *data, guest_t *guest,
char *args[], int argc);
/**
* Idle function to pass to start().
*/
typedef void (*idle_function_t)(void);
/**
* A guest is a UML instance running on the host.
**/
struct guest_t {
/**
* Get the name of this guest.
*
* @return name of the guest
*/
char* (*get_name) (guest_t *this);
/**
* Get the process ID of the guest child process.
*
* @return name of the guest
*/
pid_t (*get_pid) (guest_t *this);
/**
* Get the state of the guest (stopped, started, etc.).
*
* @return guests state
*/
guest_state_t (*get_state)(guest_t *this);
/**
* Start the guest.
*
* @param invoke UML guest invocation function
* @param data data to pass back to invoke function
* @param idle idle function to call while waiting on child
* @return TRUE if guest successfully started
*/
bool (*start) (guest_t *this, invoke_function_t invoke, void *data,
idle_function_t idle);
/**
* Kill the guest.
*
* @param idle idle function to call while waiting to termination
*/
void (*stop) (guest_t *this, idle_function_t idle);
/**
* Create a new interface in the current scenario.
*
* @param name name of the interface in the guest
* @return created interface, or NULL if failed
*/
iface_t* (*create_iface)(guest_t *this, char *name);
/**
* Destroy an interface on guest.
*
* @param iface interface to destroy
*/
void (*destroy_iface)(guest_t *this, iface_t *iface);
/**
* Create an enumerator over all guest interfaces.
*
* @return enumerator over iface_t's
*/
enumerator_t* (*create_iface_enumerator)(guest_t *this);
/**
* Adds a COWFS overlay. The directory is created if it does not exist.
*
* @param dir directory where overlay diff should point to
* @return FALSE, if failed
*/
bool (*add_overlay)(guest_t *this, char *dir);
/**
* Removes the specified COWFS overlay.
*
* @param dir directory where overlay diff points to
* @return FALSE, if no found
*/
bool (*del_overlay)(guest_t *this, char *dir);
/**
* Removes the latest COWFS overlay.
*
* @return FALSE, if no overlay was found
*/
bool (*pop_overlay)(guest_t *this);
/**
* Execute a command on the guests mconsole.
*
* @param cb callback to call for each read block
* @param data data to pass to callback
* @param cmd command to execute
* @param ... printf style argument list for cmd
* @return return value
*/
int (*exec)(guest_t *this, void(*cb)(void*,char*,size_t), void *data,
char *cmd, ...);
/**
* Execute a command on the guests mconsole, with output formatter.
*
* If lines is TRUE, callback is invoked for each output line. Otherwise
* the full result is returned in one callback invocation.
*
* @note This function does not work with binary output.
*
* @param cb callback to call for each line or for the complete output
* @param lines TRUE if the callback should be called for each line
* @param data data to pass to callback
* @param cmd command to execute
* @param ... printf style argument list for cmd
* @return return value
*/
int (*exec_str)(guest_t *this, void(*cb)(void*,char*), bool lines,
void *data, char *cmd, ...);
/**
* Called whenever a SIGCHILD for the guests PID is received.
*/
void (*sigchild)(guest_t *this);
/**
* Close and destroy a guest with all interfaces
*/
void (*destroy) (guest_t *this);
};
/**
* Create a new, unstarted guest.
*
* @param parent parent directory to create the guest in
* @param name name of the guest to create
* @param kernel kernel this guest uses
* @param master read-only master filesystem for guest
* @param args additional args to pass to kernel
* @param mem amount of memory to give the guest
*/
guest_t *guest_create(char *parent, char *name, char *kernel,
char *master, char *args);
/**
* Load a guest created with guest_create().
*
* @param parent parent directory to look for a guest
* @param name name of the guest directory
*/
guest_t *guest_load(char *parent, char *name);
#endif /* GUEST_H */
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