(libc.info.gz) Transferring Data

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 16.9.5 Transferring Data
 ------------------------
 
 Once a socket has been connected to a peer, you can use the ordinary
 'read' and 'write' operations ( I/O Primitives) to transfer data.
 A socket is a two-way communications channel, so read and write
 operations can be performed at either end.
 
    There are also some I/O modes that are specific to socket operations.
 In order to specify these modes, you must use the 'recv' and 'send'
 functions instead of the more generic 'read' and 'write' functions.  The
 'recv' and 'send' functions take an additional argument which you can
 use to specify various flags to control special I/O modes.  For example,
 you can specify the 'MSG_OOB' flag to read or write out-of-band data,
 the 'MSG_PEEK' flag to peek at input, or the 'MSG_DONTROUTE' flag to
 control inclusion of routing information on output.
 

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* Sending Data                Sending data with 'send'.
* Receiving Data              Reading data with 'recv'.
* Socket Data Options         Using 'send' and 'recv'.
 
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