can client connect() when server in sleep(300); after listen(fd,5); Post: 24810

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Top Forums Programming can client connect() when server in sleep(300); after listen(fd,5); Post 24810 by chenhao_no1 on Thursday 18th of July 2002 01:49:42 AM

07-18-2002

Registered User

Client can connect() the Sleeping Server successful

1 . with regards to Perderabo and thanks to everyone who read the post
2 . I do a experiment :
Server call socket() bind() listern() in sequence , and call sleep(30) behind listen and before I call accept() .When the Server is in sleep ,the Client connect() the sleeping Server sucessful and send a lot of appointed data to the sleeping Server ,and then block because the recvive buffer of Server has been full(the Server is asleep)
3 . I refer to <<Unix Network Programming >> volume 1 (author : W.Richard Stevens) later .
I found that accept() only "return the next completed connection from the front of the completed connection queue) .the listen() function do "......... , Data that arrives after the three-way handshake completes,but before the server call accept(),should be queued by the server TCP,up to the size of connected socket's receive buffer"
4 . Then I think that : IN SERVER side , after we call listen() ,the Server application register an appointed socket to the kernel ,then the kernel will monitor the appointed port number and wait for the Client to connect .
Then another question arise :
5 . How does the kernel monitor the appointed port when the Server application do other thing(ie. call sleep() after listen() or not occupy the processor at that point) and
6 . How doese the kernel to notify which process that the data came if many Server application let the kernel to monitory different port

chenhao_no1

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LEARN ABOUT NETBSD

listen

LISTEN(2)						      BSD System Calls Manual							 LISTEN(2)

NAME

     listen -- listen for connections on a socket

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/socket.h>

     int
     listen(int s, int backlog);

DESCRIPTION

     To accept connections, a socket is first created with socket(2), a willingness to accept incoming connections and a queue limit for incoming
     connections are specified with listen(), and then the connections are accepted with accept(2).  The listen() call applies only to sockets of
     type SOCK_STREAM or SOCK_SEQPACKET.

     The backlog parameter defines the maximum length the queue of pending connections may grow to.  If a connection request arrives with the
     queue full the client may receive an error with an indication of ECONNREFUSED, or, if the underlying protocol supports retransmission, the
     request may be ignored so that retries may succeed.

RETURN VALUES

     A 0 return value indicates success; -1 indicates an error.

ERRORS

     listen() will fail 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().

SEE ALSO

     accept(2), connect(2), socket(2)

HISTORY

     The listen() function call appeared in 4.2BSD.

BUGS

     The backlog is currently limited (silently) to 128.

BSD
								 December 11, 1993							       BSD