The <netinet/tcp.h> header shall define the following macro for use as a socket option at the IPPROTO_TCP level:
Avoid coalescing of small segments.
The macro shall be defined in the header. The implementation need not allow the value of the option to be set via setsockopt() or retrieved via getsockopt().
The following sections are informative.
COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .