Stevens (http://www.unpbook.com/) says on page 209:

The receive low-watermark is the amount of data that must be in the socket receive buffer for select to return "readable."

Unfortunately, Linux manual page says:

SO_RCVLOWAT and SO_SNDLOWAT
Specify the minimum number of bytes in the buffer until the socket layer will pass the data to the protocol
SO_SNDLOWAT) or the user on receiving (SO_RCVLOWAT). These two values are initialized to 1.
O_SNDLOWAT is not changeable on Linux (setsockopt(2) fails with the error ENOPROTOOPT).
SO_RCVLOWAT is changeable only since Linux 2.4. The select(2) and poll(2) system calls currently
do not respect the SO_RCVLOWAT setting on Linux, and mark a socket readable when even a single byte
of data is available. A subsequent read from the socket will block until SO_RCVLOWAT bytes are available.

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