ancillary data) that are not a part of the socket payload.
This control information may
include the interface the packet was received on, various rarely used header
-fields, an extended error description, a set of file descriptors or Unix
+fields, an extended error description, a set of file descriptors or UNIX
credentials.
For instance, control messages can be used to send
additional header fields such as IP options.
.fi
.in
.PP
-The code below passes an array of file descriptors over a Unix socket using
+The code below passes an array of file descriptors over a
+UNIX domain socket using
.BR SCM_RIGHTS :
.PP
.in +4n