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x25




SYNOPSIS

       #include <sys/socket.h>
       #include <linux/x25.h>

       x25_socket = socket(PF_X25, SOCK_SEQPACKET, 0);


DESCRIPTION

       X25  sockets provide an interface to the X.25 packet layer
       protocol.  This allows applications to communicate over  a
       public  X.25 data network as standardised by International
       Telecommunication Union's recommendation X.25  (X.25  DTE-
       DCE  mode). X25 sockets can also be used for communication
       without an intermediate X.25 network (X.25  DTE-DTE  mode)
       as described in ISO-8208.

       Message boundaries are preserved - a read(2) from a socket
       will retrieve the same chunk of data as  output  with  the
       corresponding write(2) to the peer socket. When necessary,
       the kernel takes care of segmenting and re-assembling long
       messages  by  means  of  the X.25 M-bit. There is no hard-
       coded upper limit for the message size. However, re-assem­
       bling of a long message might fail if there is a temporary
       lack of system resources or when other  constraints  (such
       as  socket memory or buffer size limits) become effective.
       If that occurs, the X.25 connection will be reset.


SOCKET ADDRESSES

       The AF_X25 socket address family  uses  the  struct  sock­
       addr_x25  for representing network addresses as defined in
       ITU-T recommendation X.121.

              struct sockaddr_x25 {
                  sa_family_t   sx25_family;  /* must be AF_X25 */
                  x25_address   sx25_addr;    /* X.121 Address */
              };

       sx25_addr contains a char array x25_addr[]  to  be  inter­
       preted  as a null-terminated string.  sx25_addr.x25_addr[]
       consists of up to 15  (not  counting  the  terminating  0)
       ASCII characters forming the X.121 address.  Only the dec­
       imal digit characters from `0' to `9' are allowed.


SOCKET OPTIONS

       The following X.25 specific socket options can be  set  by
       using  setsockopt(2)  and read with getsockopt(2) with the
       level parameter set to SOL_X25.

       X25_QBITINCL
              Controls whether the  X.25  Q-bit  (Qualified  Data
              Bit) is accessible by the user. It expects an inte­


BUGS

       Plenty, as the X.25 PLP implementation  is  CONFIG_EXPERI­
       MENTAL.

       This man page is incomplete.

       There is no dedicated application programmer's header file
       yet;  you  need  to  include  the   kernel   header   file
       <linux/x25.h>.   CONFIG_EXPERIMENTAL might also imply that
       future versions of the interface are not  binary  compati­
       ble.

       X.25 N-Reset events are not propagated to the user process
       yet. Thus, if a reset occurred, data might be lost without
       notice.


SEE ALSO

       socket(7), socket(2)

       Jonathan Simon Naylor: "The Re-Analysis and Re-Implementa­
       tion of X.25."  The URL is
              ftp://ftp.pspt.fi/pub/ham/linux/ax25/x25doc.tgz


VERSIONS

       The PF_X25 protocol family is a new feature of Linux  2.2.

Linux Man Page              1998-12-01                     X25(4)
  




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