I do not know what the problem is .... Here is the Code

#include<stdio.h> #include<sys/types.h> #include<sys/socket.h> #include<netdb.h> #include<unistd.h> #include<resolv.h> #include<arpa/inet.h> #include<string.h> #include<cstdlib> int main() { struct sockaddr_in sock; int fd; int sd; memset(&sock,0,sizeof(sock)); char msg[300]; sock.sin_family = PF_INET; sock.sin_port = htons(565); sock.sin_addr.s_addr = 0; //принимаем подключения на все IP if((fd = socket(AF_INET,SOCK_STREAM,0)) == -1 ) { fprintf(stderr,"Can't open socket\n"); } if ( bind(fd,(sockaddr *)&sock,sizeof(sock)) == -1 ) { fprintf(stderr,"Can't bind\n"); exit(0); } listen(fd,0x100); sockaddr_in client_addr; int client_addr_size = sizeof (client_addr); while( (sd = accept(fd,(sockaddr*)&client_addr,(socklen_t*)&client_addr_size)) !=-1 ) { send(sd,msg,sizeof(msg),0); memset(msg,0,sizeof(msg)); recv(fd,msg,sizeof(msg),0); printf("%s\n",msg); } close(fd); close(sd); scanf("%i",&sd); return 0; }

    1 answer 1

    Classic - you can’t miss ports with the number <1024. They are special, they can only be touched by the superuser.

    • You're right! Did not take this into account, thank you.) - Max
    • @Max, if the answer is correct and satisfies you, then accept it as an “answer”. To do this, click on the check mark next to the answer - ixSci
    • Of course! Guys, tell me, and what books from modern can be read on network programming under Unix? Now I read Walton ... - Max
    • @Max is already an offtopic here, but read Sneijder (Effective CNT / IP Programming) and Tannenbaum (Computer Networks) - gbg