Linux Certif

Toute la documentation sur la certification Linux LPI

unix

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unix, PF_UNIX, AF_UNIX, PF_LOCAL, AF_LOCAL - ¥í¡¼¥«¥ë¤Ê ¥×¥í¥»¥¹´ÖÄÌ¿®ÍѤΥ½¥±¥Ã¥È

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#include <sys/socket.h>
#include <sys/un.h>

unix_socket = socket(PF_UNIX, type, 0);
error = socketpair(PF_UNIX, type, 0, int *sv);

ÀâÌÀ

PF_UNIX (PF_LOCAL ¤ä PF_FILE ¤È¤â¸À¤ï¤ì¤ë) ¥½¥±¥Ã¥È¥Õ¥¡¥ß¥ê¡¼¤Ï¡¢Æ±¤¸¥Þ¥·¥ó¾å¤Ç¥×¥í¥»¥¹Æ±»Î¤¬ ¸úΨŪ¤ËÄÌ¿®¤¹¤ë¤¿¤á¤ËÍѤ¤¤é¤ì¤ë¡£ Unix ¥½¥±¥Ã¥È¤Ï¡¢ (socketpair(2) ¤ÇºîÀ®¤·¤Æ) ̾Á°¤Ê¤·¤Ë¤â¤Ç¤­¤ë¤·¡¢¥½¥±¥Ã¥È·¿¤Î¥Õ¥¡¥¤¥ë¤Ë ´ØÏ¢¤Å¤±¤ë¤³¤È¤â¤Ç¤­¤ë¡£ ¤µ¤é¤Ë Linux ¤Ç¤Ï¡¢¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Ë°Í¸¤·¤Ê¤¤ Ãê¾Ý̾Á°¶õ´Ö (abstract namespace) ¤â¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤ë¡£

Í­¸ú¤Ê¥¿¥¤¥×¤Ï°Ê²¼¤ÎÄ̤ê¤Ç¤¢¤ë:

SOCK_STREAM

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SOCK_DGRAM

¥á¥Ã¥»¡¼¥¸¶­³¦¤òÊݸ¤¹¤ë¥Ç¡¼¥¿¥°¥é¥à»Ø¸þ¤Î¥½¥±¥Ã¥È (¤Û¤È¤ó¤É¤Î Unix ¤Î¼ÂÁõ¤Ç¤Ï¡¢Unix ¥É¥á¥¤¥ó¡¦¥Ç¡¼¥¿¥°¥é¥à¡¦¥½¥±¥Ã¥È¤Ï ¾ï¤Ë¿®Íê¤Ç¤­¡¢¥Ç¡¼¥¿¥°¥é¥à¤ÎʤÓÂؤ¨¤Ï¹Ô¤ï¤Ê¤¤)

SOCK_SEQPACKET

(¥«¡¼¥Í¥ë 2.6.4 °Ê¹ß¤ÇÍøÍѤǤ­¤ë) ¥á¥Ã¥»¡¼¥¸¶­³¦¤òÊݸ¤·¡¢Á÷¿®¤µ¤ì¤¿½ç½ø¤Ç¥á¥Ã¥»¡¼¥¸¤òÆϤ±¤ëÀܳ»Ø¸þ¥½¥±¥Ã¥È

Unix ¥½¥±¥Ã¥È¤Ç¤Ï¡¢Êä½õ¥Ç¡¼¥¿¤ò»È¤Ã¤Æ ¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤ä¥×¥í¥»¥¹¤Î¿®Ç¤¾õ (credential) ¤ò Á÷¼õ¿®¤¹¤ë¤³¤È¤â¤Ç¤­¤ë¡£

¥¢¥É¥ì¥¹¤Î¥Õ¥©¡¼¥Þ¥Ã¥È

Unix ¥¢¥É¥ì¥¹¤Ï¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Ç¤Ï¥Õ¥¡¥¤¥ë̾¤È¤·¤ÆÄêµÁ¤µ¤ì¡¢ Ãê¾Ý̾Á°¶õ´Ö¤Ç¤Ï¾¤È½Å¤Ê¤é¤Ê¤¤Ê¸»úÎó¤È¤·¤ÆÄêµÁ¤µ¤ì¤Æ¤¤¤ë¡£ socketpair(2) ¤Çºî¤é¤ì¤¿¥½¥±¥Ã¥È¤Ï̾Á°¤¬¤Ê¤¤¡£Ì¾Á°¤Ê¤·¥½¥±¥Ã¥È°Ê³°¤Î¥½¥±¥Ã¥È¤Ç¤Ï¡¢ ÀܳÀ西¡¼¥²¥Ã¥È¤Î¥¢¥É¥ì¥¹¤ò connect(2) ¤ò»È¤Ã¤ÆÀßÄê¤Ç¤­¤ë¡£ ¥í¡¼¥«¥ë¥¢¥É¥ì¥¹¤Ï bind(2) ¤ò»È¤Ã¤ÆÀßÄê¤Ç¤­¤ë¡£ ¥í¡¼¥«¥ë¥¢¥É¥ì¥¹¤ò¤Þ¤À»ý¤Ã¤Æ¤¤¤Ê¤¤¥½¥±¥Ã¥È¤¬Àܳ¤µ¤ì¤¿¾ì¹ç¡¢ ¼«Æ°Åª¤ËÃê¾Ý̾Á°¶õ´Ö¤Ë¾¤È½Å¤Ê¤é¤Ê¤¤¥¢¥É¥ì¥¹¤¬À¸À®¤µ¤ì¤ë¡£

#define UNIX_PATH_MAX    108



struct sockaddr_un {

    sa_family_t    sun_family;               /* AF_UNIX */

    char           sun_path[UNIX_PATH_MAX];  /* pathname */

};

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SO_PASSCRED

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Unix ¥É¥á¥¤¥ó¡¦¥½¥±¥Ã¥È¤Ç¤Ï¡¢ÂÓ°è³°¥Ç¡¼¥¿ (out-of-band data) ¤Î Á÷¿® (send(2) ¤È recv(2) ¤Î MSG_OOB ¥Õ¥é¥°) ¤Ï¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤Ê¤¤¡£

send(2) MSG_MORE ¥Õ¥é¥°¤Ï Unix ¥É¥á¥¤¥ó¡¦¥½¥±¥Ã¥È¤Ç¤Ï¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤Ê¤¤¡£

SO_SNDBUF ¥½¥±¥Ã¥È¥ª¥×¥·¥ç¥ó¤Ï Unix ¥É¥á¥¤¥ó¡¦¥½¥±¥Ã¥È¤Ç¸ú²Ì¤ò»ý¤Ä¤¬¡¢ SO_RCVBUF ¤Ï¸ú²Ì¤¬¤Ê¤¤¡£ ¥Ç¡¼¥¿¥°¥é¥à¡¦¥½¥±¥Ã¥È¤Ç¤Ï¡¢ SO_SNDBUF ¤ÎÃͤ¬½ÐÎϥǡ¼¥¿¥°¥é¥à¤Î¾å¸Â¥µ¥¤¥º¤È¤Ê¤ë¡£ ¼ÂºÝ¤Î¾å¸ÂÃͤϡ¢ SO_SNDBUF ¥ª¥×¥·¥ç¥ó¤È¤·¤ÆÀßÄꤵ¤ì¤¿ÃͤΠ2ÇÜ (socket(7) »²¾È) ¤«¤é¥ª¡¼¥Ð¥Ø¥Ã¥É¤È¤·¤Æ»ÈÍѤµ¤ì¤ë 32 ¥Ð¥¤¥È¤ò°ú¤¤¤¿ÃͤȤʤ롣

Êä½õ¥á¥Ã¥»¡¼¥¸

Êä½õ¥Ç¡¼¥¿¤òÁ÷¼õ¤¹¤ë¤Ë¤Ï¡¢ sendmsg(2) ¤ä recvmsg(2) ¤ò»ÈÍѤ¹¤ë¡£ Îò»ËŪ¤ÊÍýͳ¤Ë¤è¤ê¡¢°Ê²¼¤Ë¼¨¤¹Êä½õ¥á¥Ã¥»¡¼¥¸¤Î·¿¤Ï ¤¿¤È¤¨ PF_UNIX ¸ÇÍ­¤Î¤â¤Î¤Ç¤¢¤Ã¤Æ¤â SOL_SOCKET ·¿¤Ç»ØÄꤹ¤ë¡£ ¤³¤ì¤é¤òÁ÷¤ë¤Ë¤Ï¡¢¹½Â¤ÂÎ cmsghdr ¤Î cmsg_level ¥Õ¥£¡¼¥ë¥É¤Ë SOL_SOCKET ¤ò¥»¥Ã¥È¤·¡¢ cmsg_type ¥Õ¥£¡¼¥ë¥É¤Ë¥¿¥¤¥×¤ò¥»¥Ã¥È¤¹¤ë¡£ ¾ÜºÙ¤Ï cmsg(3) ¤ò¸«¤è¡£

SCM_RIGHTS

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SCM_CREDENTIALS

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struct ucred {

    pid_t pid;    /* process ID of the sending process */

    uid_t uid;    /* user ID of the sending process */

    gid_t gid;    /* group ID of the sending process */

};

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ENOMEM

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ECONNREFUSED

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EINVAL

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EPROTONOSUPPORT

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ESOCKTNOSUPPORT

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EPROTOTYPE

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EADDRINUSE

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EISCONN

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ECONNRESET

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EPIPE

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EFAULT

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EPERM

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recvmsg(2), sendmsg(2), socket(2), socketpair(2), cmsg(3), capabilities(7), socket(7)