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sys/un.h - definitions for UNIX domain sockets
#include <sys/un.h>
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.
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).
<sys/socket.h> , the System Interfaces volume of IEEE Std 1003.1-2001, bind(), socket(), socketpair()
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