Transfer of line processing server from three clients

Several clients send strings to the server. The server compares them and sends information to clients. TCP communication protocol

Actually now the client sends the line, the server receives it and sends it back. And you need to make sure that 1 client sends a string - in response, nothing, 2 client sends - in response to both the result of calculations, then 3 sends - in response, a different result to all 3 clients. C / C ++ language

Server

#include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> int main() { int sock, listener; struct sockaddr_in addr; char buf[1024]; int bytes_read; listener = socket(AF_INET, SOCK_STREAM, 0); if(listener < 0){ perror("socket"); exit(1); } addr.sin_family = AF_INET; addr.sin_port = htons(3425); addr.sin_addr.s_addr = htonl(INADDR_ANY); if(bind(listener, (struct sockaddr *)&addr, sizeof(addr)) < 0){ perror("bind"); exit(2); } listen(listener, 1); while(1){ sock = accept(listener, NULL, NULL); if(sock < 0){ perror("accept"); exit(3); } while(1){ bytes_read = recv(sock, buf, 1024, 0); if(bytes_read <= 0) break; send(sock, buf, bytes_read, 0); } close(sock); } return 0; } 

Customer

 #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> char message[] = "Hello there!\n"; char buf[sizeof(message)]; int main() { int sock; struct sockaddr_in addr; sock = socket(AF_INET, SOCK_STREAM, 0); if(sock < 0){ perror("socket"); exit(1); } addr.sin_family = AF_INET; addr.sin_port = htons(3425); // или любой другой порт... addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); if(connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0){ perror("connect"); exit(2); } send(sock, message, sizeof(message), 0); recv(sock, buf, sizeof(message), 0); printf(buf); printf("sock = %d", sock); close(sock); return 0; }