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Full Discussion: recv syscall for socket programming
Top Forums Programming recv syscall for socket programming Post 49405 by heljy on Thursday 1st of April 2004 03:47:33 AM
Old 04-01-2004
recv syscall for socket programming
I have a question regarding the recv syscall.

Suppose I have a client/server and the following exchange of message took place:


Client --> Server using multiple send syscalls one after another immediately:

send "Packet1"
send "Packet2"
send "Packet3"




Server receives in the following order, taking a long time (couple of secs) to process each message received:

recv "Packet1"
-take 2 secs to process "Packet1"
recv "Packet2Packet3"


What throws me off is the second recv call that the server gets after processing the first recv call. The message is the contents of BOTH the packet 2 and packet 3 that the cilent sends.

It seems that recv reads whatever that is in the buffer, and not the sequence that message comes in. Is that true?

What I am planning to have is a server behaivor that is like this:

recv "Packet1"
- 2 sec of processing time
recv "Packet2"
- 2 sec of processing time
recv "Packet3"
- 2 sec of processing time


For example, since 3 messages are sent to the server, the server will have to call 3 recv explicity to get each individual message even though they are all already in the input buffer. Is that possible with recv?

Thanks
 

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LEARN ABOUT DEBIAN

net.recv

Net.recv(3kaya) 					       Kaya module reference						   Net.recv(3kaya)

NAME

       Net::recv - Recieve data from a connection.

SYNOPSIS

       String recv( NetHandle h, Int maxlen=-1, Int timeout=0 )

ARGUMENTS

       h The connection

       maxlen  The  maximum  number  of bytes to read (or unlimited, if negative). For TLS connections, this is always unlimited. Note that if the
       data to be received contains multi-byte characters, care must be taken to avoid ending receiving part-way through a multi-byte character.

       timeout The number of seconds to wait without input before timing out. The default is zero. For TLS connections, this parameter is ignored.

DESCRIPTION

       Reads up to maxlen bytes from the connection, and times out after timeout seconds.

AUTHORS

       Kaya standard library by Edwin Brady, Chris Morris and others (kaya@kayalang.org). For further information see http://kayalang.org/

LICENSE

       The Kaya standard library is free software; you can redistribute it and/or modify it under the terms  of  the  GNU  Lesser  General  Public
       License (version 2.1 or any later version) as published by the Free Software Foundation.

RELATED

       Net.NetHandle(3kaya)
       Net.accept(3kaya)
       Net.connect(3kaya)
       Net.microPending(3kaya)
       Net.microRecv(3kaya)
       Net.pending(3kaya)
       Net.recvByte(3kaya)
       Net.recvBytes(3kaya)
       Net.send(3kaya)

Kaya								   October 2012 						   Net.recv(3kaya)
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