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NAME
       sys/un.h - definitions for UNIX domain sockets


SYNOPSIS
       #include <sys/un.h>


DESCRIPTION
       The  <sys/un.h>  header  shall  define  the  sockaddr_un  structure  that includes at least the following
       members:

              sa_family_t  sun_family  Address family.
              char         sun_path[]  Socket pathname.

       The sockaddr_un structure is used to store addresses for UNIX domain sockets. Values of this  type  shall
       be cast by applications to struct sockaddr for use with socket functions.

       The sa_family_t type shall be defined as described in <sys/socket.h> .

       The following sections are informative.


APPLICATION USAGE
       The  size  of  sun_path 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.

       Applications   should  not  assume  a  particular  length  for  sun_path  or  assume  that  it  can  hold
       {_POSIX_PATH_MAX} characters (255).


RATIONALE
       None.


FUTURE DIRECTIONS
       None.


SEE ALSO
       <sys/socket.h> , the System Interfaces volume of IEEE Std 1003.1-2001, bind(), socket(), socketpair()


       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 .