recv function is declared in the header file
`sys/socket.h'. If your flags argument is zero, you can
just as well use
read instead of
recv; see section Input and Output Primitives.
recvfunction is like
read, but with the additional flags flags. The possible values of flags are described In section Socket Data Options.
If nonblocking mode is set for socket, and no data is available to
recv fails immediately rather than waiting. See section File Status Flags, for information about nonblocking mode.
This function returns the number of bytes received, or
-1 on failure.
errno error conditions are defined for this function:
recvblocks until there is input available to be read.)
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