How to make a Socket a Listen-only Connection Endpoint - listen()?

/*
Code Sample: Make a Socket a Listen-only
Connection Endpoint - listen() 
by GlobalGuideline.com
*/


#include <sys/types.h>
#include <sys/socket.h>

int listen(int s, int backlog)

/*
listen establishes the socket as a passive 
endpoint of a connection. It does not
suspend process execution.
*/

/*
No messages can be sent through this socket.
Incoming messages can be received.
*/

/*
s is the file descriptor associated with 
the socket created using the socket() system 
call. backlog is the size of the queue
of waiting requests while the server is busy
with a service request. The current
system-imposed maximum value is 5.
*/

/*
0 is returned on success, -1 on error
with errno indicating the problem.
*/


Example:

#include <sys/types.h>
#include <sys/socket.h>

int sockfd; /* socket file descriptor */

if(listen(sockfd, 5) < 0)
printf ("listen error %dn", errno);