UNIX man page on HP-UX

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UNIX(7P)							      UNIX(7P)

       UNIX - local communication domain protocol

       The  local  communication  domain protocol, commonly referred to in the
       industry as the Unix domain protocol, utilizes the  path	 name  address
       format  and the address family.	This protocol can be used as an alter‐
       native to the Internet protocol family (TCP/IP or UDP/IP) for  communi‐
       cation between processes executing on the same node.  It has a signifi‐
       cant throughput advantage when compared with  local  IP	loopback,  due
       primarily  to  its  much lower code execution overhead.	Data is looped
       back at the protocol layer (OSI Level 4), rather	 than  at  the	driver
       layer (OSI Level 2).

       Only is supported in the address family.

       The  HP-UX  implementation  of  the local communication domain protocol
       does not support the flag in (see recv(2)) and (see send(2)).

       socket addresses are path names.	 They  are  limited  to	 92  bytes  in
       length,	including a terminating null byte.  Calls to to an socket uti‐
       lize an addressing structure called (see bind(2)).   Pointers  to  this
       structure  should  be  used  in	all  socket system calls wherever they
       require a pointer to a

       The include file defines this addressing structure.  Within this struc‐
       ture  are  two  notable fields.	The first is sun_family, which must be
       set to The next is sun_path, which  is  the  null-terminated  character
       string  that  specifies	the  path name of the file associated with the
       socket (for example,

       Only the passive (listening) socket  must  bind	to  an	address.   The
       active socket connects to that address, but it does not need an address
       of its own.

       For additional information on using sockets for interprocess communica‐
       tion, refer to the BSD Sockets Interface Programmer's Guide.

   Socket Buffer Size
       For  stream  and	 datagram sockets, the maximum send and receive buffer
       size is 262142 bytes.  The default buffer size  is  32768  bytes.   The
       send  and  receive buffer sizes can be altered by using the and options
       of the system call.  Refer to getsockopt(2) for details.

       was developed by the University of California, Berkeley.

       getsockopt(2), socket(2).


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