11-27-2002
You should read the release notes included with the software. Even after being bought out by two different companies, Digital's documentation is still one of the best - they almost always let you know what is new, what has changed, and what is dropped.
Your release notes should be on the cd's you received - if not, I found the release notes for
DNSlink but leave finding the rest to you. Post back if this does not help.
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X25(7) Linux Programmer's Manual X25(7)
NAME
x25 - ITU-T X.25 / ISO-8208 protocol interface.
SYNOPSIS
#include <sys/socket.h>
#include <linux/x25.h>
x25_socket = socket(AF_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 net-
work 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-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 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 sys-
tem resources or when other constraints (such as socket memory or buffer size limits) become effective. If that occurs, the X.25 connec-
tion will be reset.
Socket addresses
The AF_X25 socket address family uses the struct sockaddr_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 interpreted as a null-terminated string. 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 '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 argument set to
SOL_X25.
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 correspond-
ing outgoing data packets will be set. If the first byte is 0, the Q-bit will not be set.
VERSIONS
The AF_X25 protocol family is a new feature of Linux 2.2.
BUGS
Plenty, as the X.25 PLP implementation is CONFIG_EXPERIMENTAL.
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_EXPERI-
MENTAL might also imply that future versions of the interface are not binary compatible.
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(2), socket(7)
Jonathan Simon Naylor: "The Re-Analysis and Re-Implementation of X.25." The URL is <ftp://ftp.pspt.fi/pub/ham/linux/ax25/x25doc.tgz>.
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 X25(7)