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/* Metacity UI Slave Messages */
/*
* Copyright (C) 2001 Havoc Pennington
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#ifndef META_UI_SLAVE_MESSAGES_H
#define META_UI_SLAVE_MESSAGES_H
#include <glib.h>
/* This thing badly violates the KISS principle. */
/* This header is shared between the WM and the UI slave */
/* Note that our IPC can be kind of lame; we trust both sides
* of the connection, and assume that they were compiled at the
* same time vs. the same libs on the same arch
*/
/* (and lo and behold, our IPC is kind of lame) */
/* We increment this when we change this header, so we can
* check for mismatched UI slave and WM
*/
#define META_MESSAGES_VERSION 1
/* We have an escape sequence, just in case some part of GTK
* decides to write to stdout, so that we have a good chance
* of surviving that. GTK probably won't print this string.
* This string has to stay the same always so we can ping
* old UI slaves.
*/
#define META_MESSAGE_ESCAPE "|~-metacity-~|"
/* len includes nul byte which is a required part of the escape */
#define META_MESSAGE_ESCAPE_LEN 15
/* This is totally useless of course. Playing around. */
#define META_MESSAGE_CHECKSUM(msg) ((msg)->header.length | (msg)->header.serial << 16)
#define META_MESSAGE_FOOTER(msg) ((MetaMessageFooter*) (((char*)(msg)) + ((msg)->header.length - sizeof (MetaMessageFooter))));
#define META_MESSAGE_MAX_SIZE (sizeof(MetaMessage));
#define META_MESSAGE_MAX_VERSION_LEN 15
#define META_MESSAGE_MAX_HOST_ALIAS_LEN 50
#define META_MESSAGE_MAX_TIP_TEXT 128
typedef union _MetaMessage MetaMessage;
typedef struct _MetaMessageHeader MetaMessageHeader;
typedef struct _MetaMessageFooter MetaMessageFooter;
typedef struct _MetaMessageCheck MetaMessageCheck;
typedef struct _MetaMessageShowTip MetaMessageShowTip;
typedef struct _MetaMessageHideTip MetaMessageHideTip;
typedef enum
{
/* Keep NullCode and CheckCode unchanged, as with the escape sequence,
* so we can check old UI slaves.
*/
MetaMessageNullCode,
MetaMessageCheckCode,
MetaMessageShowTipCode,
MetaMessageHideTipCode
} MetaMessageCode;
struct _MetaMessageHeader
{
MetaMessageCode message_code;
int length;
int serial;
};
/* The footer thing was pretty much just a debug hack and could die. */
struct _MetaMessageFooter
{
int checksum;
};
/* just a ping to see if we have the right
* version of UI slave.
*/
struct _MetaMessageCheck
{
MetaMessageHeader header;
/* it's OK if the max sizes aren't large enough in all cases, these
* are just paranoia checks
*/
char metacity_version[META_MESSAGE_MAX_VERSION_LEN + 1];
char host_alias[META_MESSAGE_MAX_HOST_ALIAS_LEN + 1];
int messages_version;
MetaMessageFooter footer;
};
struct _MetaMessageShowTip
{
MetaMessageHeader header;
int root_x;
int root_y;
char markup[META_MESSAGE_MAX_TIP_TEXT];
MetaMessageFooter footer;
};
struct _MetaMessageHideTip
{
MetaMessageHeader header;
/* just hides the current tip */
MetaMessageFooter footer;
};
union _MetaMessage
{
MetaMessageHeader header;
MetaMessageCheck check;
MetaMessageShowTip show_tip;
MetaMessageShowTip hide_tip;
};
/* Slave-side message send/read code */
void meta_message_send_check (void);
#endif
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