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<sys/un.h>(P)			    POSIX Programmer's Manual			    <sys/un.h>(P)

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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				    <sys/un.h>(P)
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