1sys_un.h(0P)               POSIX Programmer's Manual              sys_un.h(0P)
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PROLOG

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

13       sys/un.h — definitions for UNIX domain sockets
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SYNOPSIS

16       #include <sys/un.h>
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DESCRIPTION

19       The <sys/un.h> header shall define  the  sockaddr_un  structure,  which
20       shall include at least the following members:
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22           sa_family_t  sun_family  Address family.
23           char         sun_path[]  Socket pathname.
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25       The  sockaddr_un  structure  is used to store addresses for UNIX domain
26       sockets.  Pointers to this type shall be cast by applications to struct
27       sockaddr * for use with socket functions.
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29       The <sys/un.h> header shall define the sa_family_t type as described in
30       <sys/socket.h>.
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32       The following sections are informative.
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APPLICATION USAGE

35       The size of sun_path has intentionally been  left  undefined.  This  is
36       because different implementations use different sizes. For example, 4.3
37       BSD uses a size of 108, and 4.4 BSD uses a  size  of  104.  Since  most
38       implementations  originate  from BSD versions, the size is typically in
39       the range 92 to 108.
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41       Applications should not assume a  particular  length  for  sun_path  or
42       assume that it can hold {_POSIX_PATH_MAX} bytes (256).
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RATIONALE

45       None.
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FUTURE DIRECTIONS

48       None.
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SEE ALSO

51       <sys_socket.h>
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53       The System Interfaces volume of POSIX.1‐2008, bind(), socket(), socket‐
54       pair()
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57       Portions of this text are reprinted and reproduced in  electronic  form
58       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
59       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
60       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
61       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
62       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
63       event of any discrepancy between this version and the original IEEE and
64       The  Open Group Standard, the original IEEE and The Open Group Standard
65       is the referee document. The original Standard can be  obtained  online
66       at http://www.unix.org/online.html .
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68       Any  typographical  or  formatting  errors that appear in this page are
69       most likely to have been introduced during the conversion of the source
70       files  to  man page format. To report such errors, see https://www.ker‐
71       nel.org/doc/man-pages/reporting_bugs.html .
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75IEEE/The Open Group                  2013                         sys_un.h(0P)
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