PROLOG | NAME | SYNOPSIS | DESCRIPTION | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

sys_un.h(0P)              POSIX Programmer's Manual             sys_un.h(0P)

PROLOG         top

       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior), or
       the interface may not be implemented on Linux.

NAME         top

       sys/un.h — definitions for UNIX domain sockets

SYNOPSIS         top

       #include <sys/un.h>

DESCRIPTION         top

       The <sys/un.h> header shall define the sockaddr_un structure, which
       shall include 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.  Pointers to this type shall be cast by applications to
       struct sockaddr * for use with socket functions.

       The <sys/un.h> header shall define the sa_family_t type as described
       in <sys/socket.h>.

       The following sections are informative.

APPLICATION USAGE         top

       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} bytes (256).

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       sys_socket.h(0p)

       The System Interfaces volume of POSIX.1‐2008, bind(3p), socket(3p),
       socketpair(3p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) 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.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the
       source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                 2013                        sys_un.h(0P)