1sys_un.h(0P) POSIX Programmer's Manual sys_un.h(0P)
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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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13 sys/un.h — definitions for UNIX domain sockets
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16 #include <sys/un.h>
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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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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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45 None.
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48 None.
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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)