如何修改socket listen 的backlog系统限制参数

iamtalent

listen(SSC)
***********

____________________________________________________________________________
listen -- listen for connections on a socket

Syntax
======

cc . . . -lsocket

int listen (s, backlog)
int s, backlog;

Description
===========

To accept connections, a socket is first created with socket(SSC), a backlog
for incoming connections is specified with listen, and then the connections
are accepted with accept(SSC). The listen call applies only to sockets of
type SOCK_STREAM.

The backlog parameter defines the maximum length to which the queue of
pending connections may grow. If a connection request arrives with the
queue full, the client will receive an error with an indication of
ECONNREFUSED.

Return values
=============

A return value of zero indicates that the call succeeded. A return value of
-1 indicates that an error occurred, and in this case an error code is
stored in the global variable errno.

Errors
======

The call fails if:

[EBADF]
        The argument s is not a valid descriptor.

[ENOTSOCK]
        The argument s is not a socket.

[EOPNOTSUPP]
        The socket is not of a type that supports the operation listen.

Notes
=====

The backlog is currently limited (silently) to 5.   //默认是5