chat.h

#ifndef _CHAT_H_
#define _CHAT_H_

#define SERVER_MESSAGE_TYPE 65536
#define SHM_SIZE 65536 /* 4KB */

int shm_id;
int msg_id;
void *shm_addr;

void *cur_addr;
/*
 * Pointer starts at beginning of shared memory region,
 * then advances every time a new message is written until
 * it reaches the end, at which point it starts over at the
 * beginning, overwriting the oldest entries.
 */

struct message {
    long mtype; /* Holds the client's PID */
    char mtext[4096];
};
/*
 * The mtype for messages sent from server to clients needs
 * to encode both the client's PID and the fact that it's a
 * message to the client rather than from the client.  To do
 * this, I will have it be 65536 plus the PID of the client.
 */

__BEGIN_DECLS
void deamonize( void );
void initialize_user_list( void );
void create_shared_memory( void );
void create_message_queue( void );
void poll( void );
void server_process( struct message * );
void broadcast( char * );
void adduser( long );
void deluser( long );
void say( struct message * );
void echo( char *, long );
void write_memory( struct message * );
void memwrite( char * );
void signals( void );
void stop( int );
void cont( int );
void quit( int );
void client_process( int );
void setup_user( void );
void register_shared_memory( void );
void register_message_queue( void );
void enter_raw_mode( void );
void input_loop( void );
void exit_raw_mode( void );
void mwrite( struct message * );
void kick( void );
void update_ptr( void );
void mread( void );
char *memread( void );
__END_DECLS

#endif