Hello guys,
i am making a simple test using select() for a future program i must do. What i'm trying to do is very simple, i have a client, and a server.
The client listens to both stdin and sockfd using select. The objective is as follows:
If i write something during select (FD_ISSET(stdin,&rset) is on), i will send to the server what i just wrote, inside a buffer.
If i only press enter, the program stops.
If i don't press anything, the client generates a random number, and sends it to the server.
The only thing the server does is send an "OK" message.
This is part of the code of the client:
FD_ZERO(&rset);
FD_SET(fileno(stdin),&rset);
FD_SET(sockfd,&rset);
tv.tv_sec=timeout;
tv.tv_usec=0;
nready=select(sockfd+1,&rset,NULL,NULL,&tv);
if (FD_ISSET(fileno(stdin), &rset)){
if(fgets(buffer,MAXLINE,stdin)!=NULL){
if(strcmp(buffer,"\n")==0){printf("Suministrador desconectado \n"); close(sockfd); exit(0);}
buffer[MAXLINE]='\0';
write(sockfd,buffer,sizeof(buffer));
}
}
else{
srand(rand());
num2=rand()%10;
sprintf(itoanum,"%d",num2);
itoanum[2]='\0';
write(sockfd,itoanum,sizeof(itoanum));
}
if (FD_ISSET(sockfd, &rset)){
n=read(sockfd,buffer2,sizeof(buffer2));
buffer2[n]='\0';
printf("> %s \n",buffer2);
srand(rand());
timeout=rand()%10;
printf("%d \n",timeout);
}
}//fin bucle infinitoMy problem is that, if i put "sockfd+1" as an argument in select() (which i think it's correct), the client enters a weird loop in which it only works as if nothing had been written, it's pretty strange to explain. However, if i just put "sockfd", stdin works perfectly, but of course, i can't receive anything from sockfd.
Does anyone know what is going wrong here? It's my first time using select(), so i may be making basic mistakes.
Thanks a lot in advance.