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(libc.info)Socket Data Options

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Socket Data Options
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   The FLAGS argument to `send' and `recv' is a bit mask.  You can
bitwise-OR the values of the following macros together to obtain a
value for this argument.  All are defined in the header file
`sys/socket.h'.

 - Macro: int MSG_OOB
     Send or receive out-of-band data.  Note: Out-of-Band Data.

 - Macro: int MSG_PEEK
     Look at the data but don't remove it from the input queue.  This is
     only meaningful with input functions such as `recv', not with
     `send'.

 - Macro: int MSG_DONTROUTE
     Don't include routing information in the message.  This is only
     meaningful with output operations, and is usually only of interest
     for diagnostic or routing programs.  We don't try to explain it
     here.