/*
 * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
 *
 * Licensed under the GPL v2. For licencing details see COPYING.
 */

/** \file server.h common server data structures */

#include "para.h"
#include "afh.h"

/** size of the selector_info and audio_file info strings of struct misc_meta_data */
#define MMD_INFO_SIZE 16384

/**
 * defines one command of para_server
 */
struct server_command {
/** the name of the command */
	const char *name;
/** pointer to the function that handles the command */
	int (*handler)(int, int, char **);
/** the privileges a user must have to execute this command */
	unsigned int perms;
/** one-line description of the command */
	const char *description;
/** summary of the command line options */
	const char *usage;
/** the long help text */
	const char *help;
};

/** holds the arguments for the para_server's sender command */
struct sender_command_data{
/** greater than 0 indicates that a sender cmd is already queued */
	int cmd_num;
/** the number of the sender in question */
	int sender_num;
/** used for the allow/deny/add/remove subcommands */
	struct in_addr addr;
/** used for allow/deny */
	int netmask;
/** the portnumber for add/remove */
	int port;
};

/**
 * used for parent-child communication
 *
 * There's only one struct of this type which lives in shared memory
 * for communication between the server instances. Access to this
 * area is serialized via mmd_lock() and mmd_unlock(). There are two
 * reasons for a variable to be included here:
 *
 *  	- At least one command (i.e. child of the server) must be able to
 *  	change its value.
 *
 * or
 *
 *	- The contents are listed in the stat command and have to be up to
 *	date.
 */
struct misc_meta_data {
/** information on the current audio file  */
	struct audio_format_info afi;
/** the size of the current audio file in bytes */
	size_t size;
/** the full path of the current audio file */
	char filename[_POSIX_PATH_MAX];
/** the last modification file of the current audio file */
	time_t mtime;
/** the number of the current audio format */
	int audio_format;
/** the "old" status flags -- commands may only read them */
	unsigned int vss_status_flags;
/** the new status flags -- commands may set them **/
	unsigned int new_vss_status_flags;
/** the number of data chunks sent for the current audio file */
	long unsigned chunks_sent;
/** set by the jmp/ff commands to the new position in chunks */
	long unsigned repos_request;
/** the number of the chunk currently sent out*/
	long unsigned current_chunk;
/** the milliseconds that have been skipped of the current audio file */
	long offset;
/** the time para_server started to stream */
	struct timeval stream_start;
/** the event counter
 *
 * commands may increase this to force a status update to be sent to all
 * connected clients
*/
	unsigned int events;
/** the number of audio files already sent */
	unsigned int num_played;
/** the number of executed commands */
	unsigned int num_commands;
/** the number of connections para_server received so far */
	unsigned int num_connects;
/** the number of connections currently active */
	unsigned int active_connections;
/** the process id of para_server */
	pid_t server_pid;
/** a string that gets filled in by the current audio file selector */
	char selector_info[MMD_INFO_SIZE];
/** the number if the current audio file selector */
	int selector_num;
/** commands set this to non-zero to change the current selector */
	int selector_change;
/** used by the sender command */
	struct sender_command_data sender_cmd_data;
};

extern struct server_args_info conf;

int handle_connect(int fd, struct sockaddr_in *addr);
void mmd_unlock(void);
void mmd_lock(void);