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-.\" SPDX-License-Identifier: Linux-man-pages-1-para
-.\"
-.\" This man page is Copyright (C) 1998 Heiner Eisen.
-.\"
-.\" $Id: x25.7,v 1.4 1999/05/18 10:35:12 freitag Exp $
-.\"
-.TH x25 7 2024-01-28 "Linux man-pages 6.7"
-.SH NAME
-x25
-\-
-ITU-T X.25 / ISO/IEC\~8208 protocol interface
-.SH SYNOPSIS
-.nf
-.B #include <sys/socket.h>
-.B #include <linux/x25.h>
-.P
-.IB x25_socket " = socket(AF_X25, SOCK_SEQPACKET, 0);"
-.fi
-.SH 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 standardized 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/IEC\~8208.
-.P
-Message boundaries are preserved \[em] a
-.BR read (2)
-from a socket will
-retrieve the same chunk of data as output with the corresponding
-.BR write (2)
-to the peer socket.
-When necessary, the kernel takes care
-of segmenting and reassembling long messages by means of
-the X.25 M-bit.
-There is no hard-coded upper limit for the
-message size.
-However, reassembling 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.
-.SS Socket addresses
-The
-.B AF_X25
-socket address family uses the
-.I struct sockaddr_x25
-for representing network addresses as defined in ITU-T
-recommendation X.121.
-.P
-.in +4n
-.EX
-struct sockaddr_x25 {
-    sa_family_t sx25_family;    /* must be AF_X25 */
-    x25_address sx25_addr;      /* X.121 Address */
-};
-.EE
-.in
-.P
-.I sx25_addr
-contains a char array
-.I x25_addr[]
-to be interpreted as a null-terminated string.
-.I sx25_addr.x25_addr[]
-consists of up to 15 (not counting the terminating null byte) ASCII
-characters forming the X.121 address.
-Only the decimal digit characters from \[aq]0\[aq] to \[aq]9\[aq] are allowed.
-.SS Socket options
-The following X.25-specific socket options can be set by using
-.BR setsockopt (2)
-and read with
-.BR getsockopt (2)
-with the
-.I level
-argument set to
-.BR SOL_X25 .
-.TP
-.B X25_QBITINCL
-Controls whether the X.25 Q-bit (Qualified Data Bit) is accessible by the
-user.
-It expects an integer argument.
-If set to 0 (default),
-the Q-bit is never set for outgoing packets and the Q-bit of incoming
-packets is ignored.
-If set to 1, an additional first byte is prepended
-to each message read from or written to the socket.
-For data read from
-the socket, a 0 first byte indicates that the Q-bits of the corresponding
-incoming data packets were not set.
-A first byte with value 1 indicates
-that the Q-bit of the corresponding incoming data packets was set.
-If the first byte of the data written to the socket is 1, the Q-bit of the
-corresponding outgoing data packets will be set.
-If the first byte is 0,
-the Q-bit will not be set.
-.SH VERSIONS
-The AF_X25 protocol family is a new feature of Linux 2.2.
-.SH BUGS
-Plenty, as the X.25 PLP implementation is
-.BR CONFIG_EXPERIMENTAL .
-.P
-This man page is incomplete.
-.P
-There is no dedicated application programmer's header file yet;
-you need to include the kernel header file
-.IR <linux/x25.h> .
-.B CONFIG_EXPERIMENTAL
-might also imply that future versions of the
-interface are not binary compatible.
-.P
-X.25 N-Reset events are not propagated to the user process yet.
-Thus,
-if a reset occurred, data might be lost without notice.
-.SH SEE ALSO
-.BR socket (2),
-.BR socket (7)
-.P
-Jonathan Simon Naylor:
-\[lq]The Re-Analysis and Re-Implementation of X.25.\[rq]
-The URL is
-.UR ftp://ftp.pspt.fi\:/pub\:/ham\:/linux\:/ax25\:/x25doc.tgz
-.UE .