Socket Server C [RESOLVIDO]

#include <stdio.h>
#include <string.h> //strlen
#include <stdlib.h>
#include <errno.h>
#include <unistd.h> //close
#include <arpa/inet.h> //close
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/time.h> //FD_SET, FD_ISSET, FD_ZERO macros

#define TRUE 1
#define FALSE 0
#define PORT 9000

int main(int argc , char *argv[])
{
int opt = TRUE;
int master_socket , addrlen , new_socket , client_socket[30] , max_clients = 30 , activity, i , valread , sd;
int max_sd;
struct sockaddr_in address;

char buffer[1025]; //data buffer of 1K

//set of socket descriptors
fd_set readfds;

//a message
char *message = "ECHO Daemon v1.0 \r\n";

//initialise all client_socket[] to 0 so not checked
for (i = 0; i < max_clients; i++)
{
client_socket[i] = 0;
}

//create a master socket
if( (master_socket = socket(AF_INET , SOCK_STREAM , 0)) == 0)
{
perror("socket failed");
exit(EXIT_FAILURE);
}

//set master socket to allow multiple connections , this is just a good habit, it will work without this
if( setsockopt(master_socket, SOL_SOCKET, SO_REUSEADDR, (char *)&opt, sizeof(opt)) < 0 )
{
perror("setsockopt");
exit(EXIT_FAILURE);
}

//type of socket created
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons( PORT );

//bind the socket to localhost port 8888
if (bind(master_socket, (struct sockaddr *)&address, sizeof(address))<0)
{
perror("bind failed");
exit(EXIT_FAILURE);
}
printf("Listener on port %d \n", PORT);

//try to specify maximum of 3 pending connections for the master socket
if (listen(master_socket, 3) < 0)
{
perror("listen");
exit(EXIT_FAILURE);
}

//accept the incoming connection
addrlen = sizeof(address);
puts("Waiting for connections ...");

while(TRUE)
{
//clear the socket set
FD_ZERO(&readfds);

//add master socket to set
FD_SET(master_socket, &readfds);
max_sd = master_socket;

//add child sockets to set
for ( i = 0 ; i < max_clients ; i++)
{
//socket descriptor
sd = client_socket[i];

//if valid socket descriptor then add to read list
if(sd > 0)
FD_SET( sd , &readfds);

//highest file descriptor number, need it for the select function
if(sd > max_sd)
max_sd = sd;
}

//wait for an activity on one of the sockets , timeout is NULL , so wait indefinitely
activity = select( max_sd + 1 , &readfds , NULL , NULL , NULL);

if ((activity < 0) && (errno!=EINTR))
{
printf("select error");
}

//If something happened on the master socket , then its an incoming connection
if (FD_ISSET(master_socket, &readfds))
{
if ((new_socket = accept(master_socket, (struct sockaddr *)&address, (socklen_t*)&addrlen))<0)
{
perror("accept");
exit(EXIT_FAILURE);
}


struct timeval tv;

tv.tv_sec =8;
tv.tv_usec = 0 ;

setsockopt(new_socket, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv, sizeof(tv));



//inform user of socket number - used in send and receive commands
printf("New connection , socket fd is %d , ip is : %s , port : %d \n" , new_socket , inet_ntoa(address.sin_addr) , ntohs(address.sin_port));

//send new connection greeting message
if( send(new_socket, message, strlen(message), 0) != strlen(message) )
{
perror("send");
}

puts("Welcome message sent successfully");

//add new socket to array of sockets
for (i = 0; i < max_clients; i++)
{
//if position is empty
if( client_socket[i] == 0 )
{
client_socket[i] = new_socket;
printf("Adding to list of sockets as %d\n" , i);

break;
}
}
}

//else its some IO operation on some other socket :)
for (i = 0; i < max_clients; i++)
{
sd = client_socket[i];

if (FD_ISSET( sd , &readfds))
{
//Check if it was for closing , and also read the incoming message
if ((valread = recv( sd , buffer, 1024, 0)) == 0)
{
//Somebody disconnected , get his details and print
getpeername(sd , (struct sockaddr*)&address , (socklen_t*)&addrlen);
printf("Host disconnected , ip %s , port %d \n" , inet_ntoa(address.sin_addr) , ntohs(address.sin_port));

//Close the socket and mark as 0 in list for reuse
close( sd );
client_socket[i] = 0;
}

//Echo back the message that came in
else
{
//set the string terminating NULL byte on the end of the data read
buffer[valread] = '\0';
send(sd , buffer , strlen(buffer) , 0 );
}
}
}
}

return 0;
}

paulo1205 escreveu:

Peço desculpas pelos erros de digitação e por distrações na hora de compor a mensagem anterior, dando a impressão de que eu não sei concordância.

Eu não costumo tirar dúvidas em conversas particulares. Se você tiver outras dúvidas, eu prefiro que você as poste aqui, a fim de que todos os membros compartilhem o conhecimento.