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/**
* mds — A micro-display server
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef MDS_MDS_SERVER_H
#define MDS_MDS_SERVER_H
#include <libmdsserver/mds-message.h>
#include <stdlib.h>
#include <pthread.h>
#include <stdint.h>
/**
* A condition for a message being intercepted by a client
*/
typedef struct interception_condition
{
/**
* The header of messages to intercept, optionally with a value,
* empty (most not be NULL) for all messages.
*/
char* condition;
/**
* The hash of the header of messages to intercept
*/
size_t header_hash;
/**
* The interception priority. The client should be
* consistent with the priority for conditions that
* are not mutually exclusive.
*/
int64_t priority;
/**
* Whether the messages may get modified by the client
*/
int modifying;
} interception_condition_t;
/**
* Client information structure
*/
typedef struct client
{
/**
* The client's entry in the list of clients
*/
ssize_t list_entry;
/**
* The socket file descriptor for the socket connected to the client
*/
int socket_fd;
/**
* Whether the socket is open
*/
int open;
/**
* Message read buffer for the client
*/
mds_message_t message;
/**
* The read thread for the client
*/
pthread_t thread;
/**
* The client's ID
*/
uint64_t id;
/**
* Mutex for sending data and other
* actions that only affacts this client
*/
pthread_mutex_t mutex;
/**
* The messages interception conditions conditions
* for the client
*/
interception_condition_t* interception_conditions;
/**
* The number of interception conditions
*/
size_t interception_conditions_count;
} client_t;
/**
* A queued interception
*/
typedef struct queued_interception
{
/**
* The intercepting client
*/
client_t* client;
/**
* The interception priority
*/
int64_t priority;
/**
* Whether the messages may get modified by the client
*/
int modifying;
} queued_interception_t;
/**
* Master function for slave threads
*
* @param data Input data
* @return Outout data
*/
void* slave_loop(void* data);
/**
* Perform actions that should be taken when
* a message has been received from a client
*
* @param client The client has sent a message
*/
void message_received(client_t* client);
/**
* Add an interception condition for a client
*
* @param client The client
* @param condition The header, optionally with value, to look for, or empty (not `NULL`) for all messages
* @param priority Interception priority
* @param modifying Whether the client may modify the messages
* @param stop Whether the condition should be removed rather than added
*/
void add_intercept_condition(client_t* client, char* condition, int64_t priority, int modifying, int stop);
/**
* Multicast a message
*
* @param message The message
* @param length The length of the message
*/
void multicast_message(char* message, size_t length);
/**
* Exec into the mdsinitrc script
*
* @param args The arguments to the child process
*/
void run_initrc(char** args);
/**
* Called with the signal SIGUSR1 is caught.
* This function should cue a re-exec of the program.
*
* @param signo The caught signal
*/
void sigusr1_trap(int signo);
/**
* Marshal the server's state into a file
*
* @param fd The file descriptor
* @return Negative on error
*/
int marshal_server(int fd);
/**
* Unmarshal the server's state from a file
*
* @param fd The file descriptor
* @return Negative on error
*/
int unmarshal_server(int fd);
#endif
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