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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()

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 .