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X25

Section: Linux Programmer's Manual (4)
Updated: 1 Dec 1998
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x25, PF_X25 - ITU-T X.25 / ISO-8208 ¥×¥í¥È¥³¥ë¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹

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

x25_socket = socket(PF_X25, SOCK_SEQPACKET, 0);

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X25 ¥½¥±¥Ã¥È¤Ï X.25 ¥Ñ¥±¥Ã¥ÈÁØ¥×¥í¥È¥³¥ë¤ËÂÐ¤¹¤ë¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹¤òÄó¶¡¤¹¤ë¡£ ¤³¤ì¤Ë¤è¤ê¡¢¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ï¥Ñ¥Ö¥ê¥Ã¥¯¤Ê X.25 ¥Ç¡¼¥¿¥Í¥Ã¥È¥ï¡¼¥¯¤Ç ÄÌ¿®¤¹¤ë¤³¤È¤¬¤Ç¤¤ë¤è¤¦¤Ë¤Ê¤ë¡£ X.25 ¤Ï International Telecommunication Union's recommendation X.25 (X.25 DTE-DCE mode) ¤ÇÉ¸½à²½¤µ¤ì¤Æ¤¤¤ë¡£ X25 ¥½¥±¥Ã¥È¤Ï¡¢Ãæ´ÖÁØ¤Î¤Ê¤¤ X.25 ¥Í¥Ã¥È¥ï¡¼¥¯ (X.25 DTE-DTE mode) ¤Ç¤ÎÄÌ¿®¤Ë¤âÍÑ¤¤¤ë¤³¤È¤¬¤Ç¤¤ë¡£ DTE-DTE ¥â¡¼¥É¤Ï ISO-8208 ¤Ëµ½Ò¤µ¤ì¤Æ¤¤¤ë¡£

¥á¥Ã¥»¡¼¥¸¶³¦¤ÏÊÝÂ¸¤µ¤ì¤ë¡£¥½¥±¥Ã¥È¤«¤é¤Î read(2) ¤Ï¡¢È¿ÂÐÂ¦¤Î¥½¥±¥Ã¥È¤«¤é¤ÎÂÐ±þ¤¹¤ë write(2) ¤ÈÆ±¤¸Âç¤¤µ¤Î¥Ç¡¼¥¿¤ò¼õ¤±¼è¤ê¡¢½ÐÎÏ¤¹¤ë¡£ É¬Í×¤¬¤¢¤ë¾ì¹ç¤Ï¡¢¥«¡¼¥Í¥ë¤¬Ä¹¤¤¥á¥Ã¥»¡¼¥¸¤Î Ê¬³ä (segmenting) ¤ÈºÆ¹½À® (re-assembling) ¤ò¹Ô¤¦¡£ ¤³¤ì¤Ë¤Ï X.25 ¤Î M ¥Ó¥Ã¥È¤¬ÍÑ¤¤¤é¤ì¤ë¡£ ¥á¥Ã¥»¡¼¥¸¥µ¥¤¥º¤Ë¤Ï¡¢¥Ï¡¼¥É¥³¡¼¥Ç¥£¥ó¥°¤µ¤ì¤¿¾å¸Â¤Ï¤Ê¤¤¡£ ¤·¤«¤·¡¢°ì»þÅª¤Ë¥·¥¹¥Æ¥à¥ê¥½¡¼¥¹¤¬Â¤ê¤Ê¤«¤Ã¤¿¤ê¡¢ Â¾¤ÎÀ©Ìó (¥½¥±¥Ã¥È¥á¥â¥ê¥Ð¥Ã¥Õ¥¡¤Î¥µ¥¤¥ºÀ©¸Â¤Ê¤É) ¤¬ ¸ú¤¤¤Æ¤·¤Þ¤¦¤È¡¢Ä¹¤¤¥á¥Ã¥»¡¼¥¸¤ÎºÆ¹½À®¤Ë¤Ï¼ºÇÔ¤¹¤ë¤«¤â¤·¤ì¤Ê¤¤¡£ ¤³¤Î¾ì¹ç¡¢¤½¤Î X.25 ÀÜÂ³¤Ï¥ê¥»¥Ã¥È¤µ¤ì¤ë¤³¤È¤Ë¤Ê¤ë¡£

¥½¥±¥Ã¥È¥¢¥É¥ì¥¹

AF_X25 ¥½¥±¥Ã¥È¥¢¥É¥ì¥¹¥Õ¥¡¥ß¥ê¡¼¤Ï¡¢¥Í¥Ã¥È¥ï¡¼¥¯¥¢¥É¥ì¥¹¤òÉ½¤¹¤¿¤á¤Ë struct sockaddr_x25 ¤òÍÑ¤¤¤ë¡£¤³¤ì¤Ï ITU-T recommendation X.121 ¤ÇÄêµÁ¤µ¤ì¤Æ¤¤¤ë¡£


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

sx25_addr ¤Ë¤Ï char ÇÛÎó x25_addr[] ¤ò´Þ¤Þ¤ì¤ë¡£¤³¤ì¤Ï 0 ¤Ç½ªÃ¼¤¹¤ëÊ¸»úÎó¤È¤·¤Æ²ò¼á¤µ¤ì¤ë¡£ sx25_addr.x25_addr[] ¤Ï 15 ¸Ä¤Þ¤Ç¤Î ASCII Ê¸»ú¤ò´Þ¤à¤³¤È¤¬¤Ç¤ (½ªÃ¼¤Î 0 ¤Ï´Þ¤Þ¤Ê¤¤)¡¢ ¤³¤ì¤¬ X.121 ¥¢¥É¥ì¥¹¤ò¤Ê¤¹¡£ 10 ¿Ê¤Î¿ôÊ¸»ú¡¢ `0' ¤«¤é `9' ¤Þ¤Ç¤À¤±¤¬µö¤µ¤ì¤ë¡£

¥½¥±¥Ã¥È¥ª¥×¥·¥ç¥ó

°Ê²¼¤Î X.25 ÆÃÍ¤Î¥½¥±¥Ã¥È¥ª¥×¥·¥ç¥ó¤Ï¡¢ setsockopt(2) ¤ÇÀßÄê¤Ç¤¡¢ getsockopt(2) ¤Ç¼èÆÀ¤Ç¤¤ë¡£¤³¤Î¤È¤¥ì¥Ù¥ë¥Ñ¥é¥á¡¼¥¿¤Ë¤Ï SOL_X25 ¤ò»ØÄê¤¹¤ë¡£

X25_QBITINCL: X.25 ¤Î Q ¥Ó¥Ã¥È (Qualified ¥Ç¡¼¥¿¥Ó¥Ã¥È) ¤Ë¥æ¡¼¥¶¡¼¤¬¥¢¥¯¥»¥¹ ¤Ç¤¤ë¤«¤É¤¦¤«¤ò¥³¥ó¥È¥í¡¼¥ë¤¹¤ë¡£À°¿ô¤Î°ú¿ô¤ò¼è¤ë¡£ 0 ¤Ë¥»¥Ã¥È¤¹¤ë¤È¡¢ Q ¥Ó¥Ã¥È¤ÏÈ¯¿®¥Ñ¥±¥Ã¥È¤Ë¤Ï·è¤·¤Æ¥»¥Ã¥È¤µ¤ì¤º¡¢ ¼õ¿®¥Ñ¥±¥Ã¥È¤Ç¤ÏÌµ»ë¤µ¤ì¤ë (¥Ç¥Õ¥©¥ë¥È)¡£ 1 ¤Ë¥»¥Ã¥È¤¹¤ë¤È¡¢¥½¥±¥Ã¥È¤«¤éÆÉ¤à¡¢¤¢¤ë¤¤¤Ï¥½¥±¥Ã¥È¤ËÁ÷¤ë ¥á¥Ã¥»¡¼¥¸¤½¤ì¤¾¤ì¤ËÀèÆ¬¥Ð¥¤¥È¤¬Á°ÃÖ¤µ¤ì¤ë¡£ ¥½¥±¥Ã¥È¤«¤éÆÉ¤ó¤À¥Ç¡¼¥¿¤Ç¤Ï¡¢ÀèÆ¬¥Ð¥¤¥È¤¬ 0 ¤À¤È¡¢ ¤³¤ÎÅþÃå¥Ç¡¼¥¿¥Ñ¥±¥Ã¥È¤ËÂÐ±þ¤¹¤ë Q ¥Ó¥Ã¥È¤Ï¥»¥Ã¥È¤µ¤ì¤Æ¤¤¤Ê¤«¤Ã¤¿¤³¤È¤Ë¤Ê¤ë¡£ ÀèÆ¬¥Ð¥¤¥È¤¬ 1 ¤À¤È¡¢ÅþÃå¥Ç¡¼¥¿¥Ñ¥±¥Ã¥È¤Î Q ¥Ó¥Ã¥È¤¬¥»¥Ã¥È¤µ¤ì¤Æ¤¤¤¿¤³¤È¤Ë¤Ê¤ë¡£ ¥½¥±¥Ã¥È¤Ë½ñ¤¹þ¤à¥Ç¡¼¥¿¤ÎÀèÆ¬¥Ð¥¤¥È¤¬ 1 ¤À¤È¡¢ ¤½¤ÎÈ¯¿®¥Ñ¥±¥Ã¥È¤Î Q ¥Ó¥Ã¥È¤ò¥»¥Ã¥È¤¹¤ë¡£ 0 ¤À¤È¡¢ Q ¥Ó¥Ã¥È¤ò¥»¥Ã¥È¤·¤Ê¤¤¡£

¥Ð¥°

X.25 PLP ¼ÂÁõ¤Ï CONFIG_EXPERIMENTAL ¤Ê¤Î¤Ç¡¢¤¿¤¯¤µ¤ó¤¢¤ë¤À¤í¤¦¡£

¤³¤Î man ¥Ú¡¼¥¸¤Ï´°À®¤·¤Æ¤¤¤Ê¤¤¡£

¤Þ¤À¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¥×¥í¥°¥é¥Þ¡¼ÍÑ¤Î¥Ø¥Ã¥À¥Õ¥¡¥¤¥ë¤¬¤Ê¤¤¡£ ¥«¡¼¥Í¥ë¤Î¥Ø¥Ã¥À¥Õ¥¡¥¤¥ë <linux/x25.h> ¤ò¥¤¥ó¥¯¥ë¡¼¥É¤·¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£ CONFIG_EXPERIMENTAL ¤Ê¤Î¤Ç¡¢¾Íè¤Î¥Ð¡¼¥¸¥ç¥ó¤Î¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹¤Ç¤Ï ¥Ð¥¤¥Ê¥ê¸ß´¹À¤¬¼º¤ï¤ì¤ë¤«¤â¤·¤ì¤Ê¤¤¡£

X.25 N-Reset ¥¤¥Ù¥ó¥È¤Ï¡¢¤Þ¤À¥æ¡¼¥¶¡¼¥×¥í¥»¥¹¤ËÅÁÇÅ¤·¤Ê¤¤¡£ ¤·¤¿¤¬¤Ã¤Æ¥ê¥»¥Ã¥È¤¬µ¯¤³¤ë¤È¡¢¥Ç¡¼¥¿¤ÏÄÌÃÎÌµ¤·¤Ë¼º¤ï¤ì¤ë¡£

´ØÏ¢¹àÌÜ

socket(7), socket(2)

Jonathan Simon Naylor: lqX.25 ¤ÎºÆÊ¬ÀÏ¤ÈºÆ¼ÂÁõrq

: URL ¤Ï ftp://ftp.pspt.fi/pub/ham/linux/ax25/x25doc.tgz

¥Ð¡¼¥¸¥ç¥ó

PF_X25 ¥×¥í¥È¥³¥ë¥Õ¥¡¥ß¥ê¤Ï Linux 2.2 ¤Î¿·µ¡Ç½¤Ç¤¢¤ë¡£

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