.I sockfd
is a descriptor for a file, not a socket.
.PP
-The following errors are specific to Unix domain
+The following errors are specific to UNIX domain
.RB ( AF_UNIX )
sockets:
.TP
.\" .B EIO
.\" and
.\" .B EISDIR
-.\" Unix-domain error conditions.
+.\" UNIX-domain error conditions.
.SH NOTES
POSIX.1-2001 does not require the inclusion of
.IR <sys/types.h> ,
with Internet domain sockets can be found in
.BR getaddrinfo (3).
-The following example shows how to bind a stream socket in the Unix
+The following example shows how to bind a stream socket in the UNIX
.RB ( AF_UNIX )
domain, and accept connections:
.\" listen.7 refers to this example.