Solved

socket error

Posted on 2011-03-06
6
557 Views
Last Modified: 2012-05-11
In my logs I see many "system error 104" during TCP send() which I am sure mostly likely connection was lost by server and serve is still trying to send the data.

However once in a while I do see "system error 32" also during send()
what could be the reason for sys error 32?  I am trying to chase an issue and just wanted to understand the socket behavior
0
Comment
Question by:learningunix
  • 3
  • 2
6 Comments
 
LVL 53

Expert Comment

by:Infinity08
ID: 35047062
Assuming that this is Linux, you can use perror to get a more human readable error message for these error codes.

You'll get something like "Connection reset by peer" for errno 104 (ECONNRESET), and "Broken pipe" for errno 32 (EPIPE).

In the context of a send, ECONNRESET means that the remote end (peer) closed the connection, sending a reset. And EPIPE means that the socket doesn't allow writing, or is not connected (both usually have local causes).
0
 

Author Comment

by:learningunix
ID: 35047882
Under what circumstance would socket not allow to write and fail with EPIPE?  is it because the socke is full? or something else?
0
 
LVL 53

Accepted Solution

by:
Infinity08 earned 400 total points
ID: 35048263
>> Under what circumstance would socket not allow to write and fail with EPIPE?

A common circumstance for this, is when the connection is in the process of being closed. The write half (sending half) can already be closed, but the read half (receiving half) not yet (waiting confirmation from the other end).

Read up on the TCP protocol for more specifics of how TCP connections are managed.
0
Active Directory Webinar

We all know we need to protect and secure our privileges, but where to start? Join Experts Exchange and ManageEngine on Tuesday, April 11, 2017 10:00 AM PDT to learn how to track and secure privileged users in Active Directory.

 
LVL 12

Assisted Solution

by:trinitrotoluene
trinitrotoluene earned 100 total points
ID: 35051152
I've seen this happen before! First of all

32 maps to EPIPE - broken pipe

104 -  ECONNRESET connection reset by the peer

so if you are seeing this it is most definitely a case of closing either end of the socket before a send/recv has completed just as Infinity has suggested. The solution is to implement  a handshake so that the socket is not closed until you receive an acknowledgement about the receipt of the message from the other end.

Also see my solution in EE for a related problem
http://www.experts-exchange.com/Programming/Languages/CPP/Q_26557236.html
0
 
LVL 53

Expert Comment

by:Infinity08
ID: 35053783
>> The solution is to implement  a handshake so that the socket is not closed until you receive an acknowledgement about the receipt of the message from the other end.

?? TCP already does that for you.
0
 

Author Closing Comment

by:learningunix
ID: 35060415
Thx
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Socket Programming (Unix) 8 142
How to gracefully close the c++ 11 thread? 3 108
Dialogbox API leak? 18 99
Create a path if not exists 7 90
Article by: SunnyDark
This article's goal is to present you with an easy to use XML wrapper for C++ and also present some interesting techniques that you might use with MS C++. The reason I built this class is to ease the pain of using XML files with C++, since there is…
Container Orchestration platforms empower organizations to scale their apps at an exceptional rate. This is the reason numerous innovation-driven companies are moving apps to an appropriated datacenter wide platform that empowers them to scale at a …
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.

830 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question