12-20-2010
Quote:
Originally Posted by
sehang
No, it means that no more than 128 pending connections can be waiting at once. 128 people somewhere on the internet that are doing connect(my_fd, your_server); and the server has told them "OK, wait in line".
Quote:
Can you problem me a direction that how client knows the server has been reach the limit of backlog?
I think the client will just get "connection refused" when the server already has the maximum number of pending connections waiting. Note that this is
pending connections: It won't limit
established connections for you, you have to do that yourself.
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LEARN ABOUT MOJAVE
listen
LISTEN(2) BSD System Calls Manual LISTEN(2)
NAME
listen -- listen for connections on a socket
SYNOPSIS
#include <sys/socket.h>
int
listen(int socket, int backlog);
DESCRIPTION
Creation of socket-based connections requires several operations. First, a socket is created with socket(2). Next, a willingness to accept
incoming connections and a queue limit for incoming connections are specified with listen(). Finally, the connections are accepted with
accept(2). The listen() call applies only to sockets of type SOCK_STREAM.
The backlog parameter defines the maximum length for the queue of pending connections. If a connection request arrives with the queue full,
the client may receive an error with an indication of ECONNREFUSED. Alternatively, if the underlying protocol supports retransmission, the
request may be ignored so that retries may succeed.
RETURN VALUES
The listen() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
the error.
ERRORS
listen() will fail if:
[EACCES] The current process has insufficient privileges.
[EBADF] The argument socket is not a valid file descriptor.
[EDESTADDRREQ] The socket is not bound to a local address and the protocol does not support listening on an unbound socket.
[EINVAL] socket is already connected.
[ENOTSOCK] The argument socket does not reference a socket.
[EOPNOTSUPP] The socket is not of a type that supports the operation listen().
SEE ALSO
accept(2), connect(2), connectx(2), socket(2)
BUGS
The backlog is currently limited (silently) to 128.
HISTORY
The listen() function call appeared in 4.2BSD.
4.2 Berkeley Distribution March 18, 2015 4.2 Berkeley Distribution