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Recv()ing a long message
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Is there a way to read the long answer from server not using non-blocking sockets?
The problem is that recv blocks if server stops to send.
So, how to break from while(true) before recv() blocks? My experiments with select() failed. =(
The problem is that recv blocks if server stops to send.
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Join Date: Dec 2005
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Erm, you use select(), and you post some kind of attempt at using select() so we can figure out where you went wrong.
Saying which OS and compiler you're using would be a good idea as well.
Saying which OS and compiler you're using would be a good idea as well.
I'm using gcc 3.x on FreeBSD 6.1
I tried select in this way:
fd_set fd_cnt;
FD_ZERO(&fd_cnt);
FD_SET(skt, &fd_cnt);
while(true){
select(skt+1, &fd_cnt, NULL, NULL, 0);
if(!FD_ISSET(skt, &fd_cnt))break;
n=recv(skt, buf, BUFFER_SIZE,0);
if(n<=0)break;
buf[n]='\0';
std::cout<<buf;
}
but recv() still blocks.
I tried select in this way:
fd_set fd_cnt;
FD_ZERO(&fd_cnt);
FD_SET(skt, &fd_cnt);
while(true){
select(skt+1, &fd_cnt, NULL, NULL, 0);
if(!FD_ISSET(skt, &fd_cnt))break;
n=recv(skt, buf, BUFFER_SIZE,0);
if(n<=0)break;
buf[n]='\0';
std::cout<<buf;
}
but recv() still blocks.
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Originally Posted by Salem 
Erm, you use select(), and you post some kind of attempt at using select() so we can figure out where you went wrong.
from what I know a blocking socket will be blocking. If you're not creating the socket then try making it non-blocking while you're using it and then make it blocking once you're done with your work.. not so nice to do though..
Use fcntl to make it non/blocking..
Last edited by thekashyap; Apr 17th, 2007 at 4:35 am.
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You can specify a timeout with select().
I wasn't going to bother answering the post without code tags.
I wasn't going to bother answering the post without code tags.
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Originally Posted by thekashyap
Wouldn't select() itself block !? If it does it anyway can't be used for this problem..
from what I know a blocking socket will be blocking. If you're not creating the socket then try making it non-blocking while you're using it and then make it blocking once you're done with your work.. not so nice to do though..
Use fcntl to make it non/blocking..
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found a simple solvation.
man recv really helped me out =)
so, in simple case we can bypass non-blocking sockets and select(). There is a way to tell recv() not to block by using MSG_DONTWAIT value.
thank you for assistance =)
man recv really helped me out =)
so, in simple case we can bypass non-blocking sockets and select(). There is a way to tell recv() not to block by using MSG_DONTWAIT value.
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thank you for assistance =)
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