9.15 Summary
SCTP provides the application writer with two
different interface styles: the one-to-one style, mostly compatible
with existing TCP applications to ease migration to SCTP, and the
one-to-many style, allowing access to all of SCTP's features. The
sctp_peeloff function provides a method of extracting an
association from one style to the other. SCTP also provides
numerous notifications of transport events to which an application
may wish to subscribe. These events can aid an application in
better managing the associations it maintains.
Since SCTP is multihomed, not all the standard
sockets functions introduced in Chapter 4 are adequate. Functions
like sctp_bindx, sctp_connectx,
sctp_getladdrs, and sctp_getpaddrs provide
methods to better control and examine the multiple addresses that
can make up an SCTP association. Utility functions such as
sctp_sendmsg and sctp_recvmsg can simplify the
use of these advanced features. We will explore many of the
concepts introduced in this chapter in more detail through examples
in Chapters
10 and 23.
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