0p:un.h
From Linux Man Pages
sys/un.h - definitions for UNIX domain sockets
#include <sys/un.h>
Contents |
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 dif-
ferent 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.
RELATED
<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, Stan-
dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
tions 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 .
IEEE/The Open Group 2003 <sys/un.h>(P)