Untitled

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main(void)
    {
        fd_set master;   
        fd_set read_fds; 
        struct sockaddr_in myaddr;     
        struct sockaddr_in remoteaddr; 
        int fdmax;       
        int listener;     
        int newfd;       
        char buf[256];    
        int nbytes;
        int yes=1;        
        int addrlen;
        int i;
        FD_ZERO(&master);   
        FD_ZERO(&read_fds);
        if ((listener = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
            perror("socket");
            exit(1);
        }
        if (setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, &yes,sizeof(int)) == -1) {
            perror("setsockopt");
            exit(1);
        }
        myaddr.sin_family = AF_INET;
        myaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
        myaddr.sin_port = htons(33601);
        memset(&(myaddr.sin_zero), '\0', 8);
        if (bind(listener, (struct sockaddr *)&myaddr, sizeof(myaddr)) == -1) {
            perror("bind");
            exit(1);
        }
        if (listen(listener, 10) == -1) {
            perror("listen");
            exit(1);
        }
       
        FD_SET(listener, &master);
        
        fdmax = listener; 
        
        while (1) {
            read_fds = master;
            if (select(fdmax+1, &read_fds, NULL, NULL, NULL) == -1) {
                perror("select");
                exit(1);
            }
            
            for(i = 0; i <= fdmax; i++) 
	    {
                if (FD_ISSET(i, &read_fds)) 
		{
                    if (i == listener) 
		    {
                        
                        addrlen = sizeof(remoteaddr);
                        if ((newfd = accept(listener, (struct sockaddr *)&remoteaddr,&addrlen)) == -1) perror("accept");
			else 
			{
                            FD_SET(newfd, &master); // 
                            if (newfd > fdmax) fdmax = newfd;   
                            printf("utworzono nowe polaczenieni z %s, socket %d\n", inet_ntoa(remoteaddr.sin_addr), newfd);
                        }
                    } 
		    if (i != listener) 
		    {
                        
			nbytes = recv(i,buf,sizeof(buf),0);
			if (nbytes <= 0)
			{
                        	if (nbytes == 0) printf("Klient %d rozlaczyl sie\n",i);
	                    	if (nbytes < 0) perror("recv");
	                        close(i); 
        	                FD_CLR(i, &master); 
			}
                    	else puts(buf);
                    }
                }
            }
        }
return 0;
}