void ServPanelist ( Connection panelist, struct sockaddr_in client)
{
int psd, index=0;
pid_t childpid;
socklen_t t = sizeof(panelist.server);
for(;;){
psd = accept(panelist.socket_s, (struct sockaddr *) &client, &t);
EchoServe(psd, client, GETUSERNAME);
childpid = fork();
if ( childpid == 0) {
signal (SIGQUIT, SIG_IGN);
signal (SIGINT, SIG_IGN);
signal (SIGTSTP,SIG_IGN);
if (signal(SIGUSR1, displayHandle) == SIG_ERR) {
fprintf(stderr, "cannot set handler for SIGUSR1\n");
}
if (signal(SIGUSR2, SendMessage) == SIG_ERR) {
fprintf(stderr, "cannot set handler for SIGUSR2\n");
}
close (panelist.socket_s);
EchoServe(psd, client, SERVPANEL);
}
else{
signal (SIGQUIT, SIG_IGN);
signal (SIGINT, SIG_IGN);
signal (SIGTSTP,SIG_IGN);
cout << "\nNew Panel Client: (" << inet_ntoa(client.sin_addr) << ":" << ntohs(client.sin_port) <<
") [" << client_msg << "]" << endl;
cout << "Forked Panel Handler, PID = " << childpid << endl;
*sharedInt_index = *sharedInt_index + 1 ;
index = *sharedInt_index;
//cout << "new parti " << index <<endl;
list_participants[index].client_type = PARTICIPANT_PAN;
list_participants[index].pid = childpid;
list_participants[index].port = client.sin_port;
list_participants[index].address = client.sin_addr;
list_participants[index].buf_stream = psd;
strcpy(list_participants[index].user_name, client_msg);
// current date/time based on current system
list_participants[index].time_in = time (NULL);
}
}
}
void ServAudience ( Connection audience, struct sockaddr_in client)
{
int psd, childpid, index=0;
socklen_t t = sizeof(audience.server);
for(;;){
psd = accept(audience.socket_s, (struct sockaddr *) &client, &t);
EchoServe(psd, client, GETUSERNAME);
childpid = fork();
if ( childpid == 0) {
signal (SIGQUIT, SIG_IGN);
signal (SIGINT, SIG_IGN);
signal (SIGTSTP,SIG_IGN);
if (signal(SIGUSR1, displayHandle) == SIG_ERR) {
fprintf(stderr, "cannot set handler for SIGUSR1\n");
}
// getting interrupt to send an audience message
if (signal(SIGUSR2, SendMessage) == SIG_ERR) {
fprintf(stderr, "cannot set handler for SIGUSR2\n");
}
close (audience.socket_s);
EchoServe(psd, client, SERVAUDIENCE);
}
else{
signal (SIGQUIT, SIG_IGN);
signal (SIGINT, SIG_IGN);
signal (SIGTSTP,SIG_IGN);
cout << "\nNew AUDIENCE Client: (" << inet_ntoa(client.sin_addr) << ":" << ntohs(client.sin_port) <<
") [" << client_msg << "]" << endl;
cout << "Forked AUDIENCE Handler, PID = " << childpid << endl;
*sharedInt_index = *sharedInt_index + 1 ;
index = *sharedInt_index;
//cout << "new parti " << index <<endl;
list_participants[index].client_type = PARTICIPANT_AUD;
list_participants[index].pid = childpid;
list_participants[index].port = client.sin_port;
list_participants[index].address = client.sin_addr;
list_participants[index].buf_stream = psd;
strcpy(list_participants[index].user_name, client_msg);
list_participants[index].time_in = time (NULL);
}
}
}
main()
{
fd_set read_template;//conjunto de descritores de arquivos
struct timeval wait;//arg do select, diz quanto esperar
//para que algum descritor fique pronto
struct sockaddr_in server;
char buf[102];
int sock, length, s1,s2, nb, cc, ready,eof1,eof2;
//Cria socket
sock = socket (PF_INET,SOCK_STREAM,0);
if ( sock < 0 ) {
perror("Erro na execucao da chamada socket()");
exit(0);
}
//preenche o struct de enderecos PF_INET
//faz o Bind
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
server.sin_port = 0;
if ( bind (sock,&server,sizeof(server)) ) {
perror("Erro na execucao da chamada bind()");
}
// Usa a chamada getsockname para descobrir o n. de porta
//associado, haja visto que, server.sin_port = 0
length = sizeof(server);
if ( getsockname (sock,&server,&length) ) {
perror("Erro na execucao da chamada getsockname()");
exit(0);
}
printf("SERVIDOR EXECUTANDO: aguardando conexoes dos clientes\n");
printf("Numero da porta usada pelo servidor: #%d\n", ntohs(server.sin_port));
//inicia a aceitacao de conexoes
//note que existem duas execucoes do accept
//ou seja, no maximo dois sockets de cliente
//poderam ser manipulados pelo processo gerado por srverselect.c
listen (sock, 5);
s1= accept(sock,0,0);
eof1=0;//testa status da conexao
printf("Cliente 1 conectado\n");
s2 = accept(sock,0,0);
eof2=0;
printf("Cliente 2 conectado\n");
wait.tv_sec = 1;//struct de tempo duracao da selecao em seg
wait.tv_usec = 0;//microseg
//se timeout = 0 situacao de polling
do {
FD_ZERO(&read_template);//MACRO que limpa o fdset
if (!eof1) FD_SET(s1,&read_template);//liga s1 no fdset e testa STATUS da conexao
if (!eof2) FD_SET(s2,&read_template);//liga s2 no fdset e testa STATUS da conexao
//executa o select ems1 e s2
//select aguarda que um dos dois mude o STATUS
nb = select(FD_SETSIZE, &read_template, (fd_set *) 0, (fd_set *) 0, &wait);
// select (tamanho de fdset, ponteiro para leitura de dados, escrita de dados
// ,excecao, timeout);//excecoes: apenas dados outband em sockets
//caso nao queira testar nada e so passar ponteiro nulo.
//sucesso nb = numero de descritores aptos no fdset
//se retornar = 0 foi devido ao timeout
if (nb <0) {
perror("Erro na chamada select()");
exit(1);
}
if (nb != 0) { /* 0 time out */
if(FD_ISSET(s1, &read_template)){//testa a existencia de s1 com menbro do fdset
EchoServe(s1, &eof1);//responde para s1
}
if(FD_ISSET(s2, &read_template)){//faz polling s2
EchoServe(s2, &eof2);//responde s2
}
}
} while ( !eof1 || !eof2 );
printf("Exit : finalizando programa\n");//somente se nao tiver nenhuma conexao ativa
close(s1);
close(s2);
exit(0);
}
void ServAudience ( Connection audience, struct sockaddr_in client)
{
int psd, childpid, index=0;
socklen_t t = sizeof(audience.server);
int *status;
for(;;){
psd = accept(audience.socket_s, (struct sockaddr *) &client, &t);
EchoServe(psd, client, GETUSERNAME);
childpid = fork();
if ( childpid == 0) {
signal (SIGTSTP,SIG_IGN);
if (signal(SIGUSR1, displayHandle) == SIG_ERR) {
fprintf(stderr, "cannot set handler for SIGUSR1\n");
}
// getting interrupt to send an audience message
if (signal(SIGUSR2, SendMessage) == SIG_ERR) {
fprintf(stderr, "cannot set handler for SIGUSR2\n");
}
close (audience.socket_s);
EchoServe(psd, client, SERVAUDIENCE);
}
else{
signal (SIGTSTP,SIG_IGN);
cout << "\nNew audience Client: (" << inet_ntoa(client.sin_addr) << ":" << ntohs(client.sin_port) <<
") [" << client_msg << "]" << endl;
cout << "Forked audience Handler, PID = " << childpid << endl;
*sharedInt_index = *sharedInt_index + 1 ;
index = *sharedInt_index;
//cout << "new parti " << index <<endl;
list_participants[index].client_type = PARTICIPANT_AUD;
list_participants[index].pid = childpid;
list_participants[index].port = client.sin_port;
list_participants[index].address = client.sin_addr;
list_participants[index].buf_stream = psd;
strcpy(list_participants[index].user_name, client_msg);
// current date/time based on current system
list_participants[index].time_in = time (NULL);
//if Q&A session opened send a message
if (*QAsessionFlag == 0)
{
sprintf(client_msg,"%s", "We are in Q&A session now!");
//int signal_sent = kill(list_participants[index].pid , SIGUSR2);
}
}
//Handle the child signal just end. Meaning of someone left the room. Pipe broken.
int pid=wait(&status);
//#define PARTICIPANT_AUD 1
//#define PARTICIPANT_PAN 2
//checkParticipant(index,PARTICIPANT_AUD);
}
}
