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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "<sys/un.h>" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" <sys/un.h> 
+.SH NAME
+sys/un.h \- definitions for UNIX domain sockets
+.SH SYNOPSIS
+.LP
+\fB#include <sys/un.h>\fP
+.SH DESCRIPTION
+.LP
+The \fI<sys/un.h>\fP header shall define the \fBsockaddr_un\fP structure
+that includes at least the following
+members:
+.sp
+.RS
+.nf
+
+\fBsa_family_t  sun_family \fP Address family. \fB
+char         sun_path[] \fP Socket pathname. \fB
+\fP
+.fi
+.RE
+.LP
+The \fBsockaddr_un\fP structure is used to store addresses for UNIX
+domain sockets. Values of this type shall be cast by
+applications to \fBstruct sockaddr\fP for use with socket functions.
+.LP
+The \fBsa_family_t\fP type shall be defined as described in \fI<sys/socket.h>\fP
+\&.
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+The size of \fIsun_path\fP has intentionally been left undefined.
+This is because different implementations use different
+sizes. For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a
+size of 104. Since most implementations originate from BSD
+versions, the size is typically in the range 92 to 108.
+.LP
+Applications should not assume a particular length for \fIsun_path\fP
+or assume that it can hold {_POSIX_PATH_MAX} characters
+(255).
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fI<sys/socket.h>\fP , the System Interfaces volume of
+IEEE\ Std\ 1003.1-2001, \fIbind\fP(), \fIsocket\fP(), \fIsocketpair\fP()
+.SH COPYRIGHT
+Portions 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 .