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getaddrinfo

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getaddrinfo, freeaddrinfo, gai_strerror - ¥Í¥Ã¥È¥ï¡¼¥¯¤Î¥¢¥É¥ì¥¹¤È¥µ¡¼¥Ó¥¹¤òÊÑ´¹¤¹¤ë

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#include <sys/types.h>

#include <sys/socket.h>

#include <netdb.h>



int getaddrinfo(const char *node, const char *service,

                const struct addrinfo *hints,

                struct addrinfo **res);



void freeaddrinfo(struct addrinfo *res);



const char *gai_strerror(int errcode);

ÀâÌÀ

getaddrinfo(3) ´Ø¿ô¤Ï¡¢4 ¤Ä¤Î´Ø¿ô getipnodebyname(3), getipnodebyaddr(3), getservbyname(3), getservbyport(3) ¤Îµ¡Ç½¤ò¤Þ¤È¤á¤Æ°ì¤Ä¤Î¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹¤Ë¤·¤¿¤â¤Î¤Ç¤¢¤ë¡£ getaddrinfo(3) ´Ø¿ô¤Ï¥¹¥ì¥Ã¥É¥»¡¼¥Õ¤Ç¡¢ ¤Ò¤È¤Ä°Ê¾å¤Î¥½¥±¥Ã¥È¥¢¥É¥ì¥¹¹½Â¤ÂΤòÀ¸À®¤¹¤ë¡£ ¤³¤Î¹½Â¤ÂÎ¤Ï bind(2) ¤ä connect(2) ¤Ê¤É¤Î´Ø¿ô¥³¡¼¥ë¤Ç¥¯¥é¥¤¥¢¥ó¥ÈÍÑ¡¦¥µ¡¼¥Ð¡¼ÍѤΥ½¥±¥Ã¥È¤òÀ¸À®¤¹¤ëºÝ¤Ë ÍѤ¤¤ë¤³¤È¤¬¤Ç¤­¤ë¡£

getaddrinfo(3) ´Ø¿ô¤¬ºî¤ë¤³¤È¤Î¤Ç¤­¤ë¤Î¤Ï IPv4 ¥¢¥É¥ì¥¹¹½Â¤ÂΤÀ¤±¤Ç¤Ï¤Ê¤¤¡£ IPv6 ¤Î¥µ¥Ý¡¼¥È¤µ¤ì¤Æ¤¤¤ë¥·¥¹¥Æ¥à¤Ê¤é IPv6 ¤Î¥½¥±¥Ã¥È¥¢¥É¥ì¥¹¹½Â¤ÂΤâÀ¸À®¤Ç¤­¤ë¡£ ¤³¤ì¤é¤Î¥½¥±¥Ã¥È¥¢¥É¥ì¥¹¹½Â¤ÂΤϡ¢ ¥¯¥é¥¤¥¢¥ó¥È¤ä¥µ¡¼¥Ð¡¼¤Ç¥½¥±¥Ã¥È¤ò½àÈ÷¤¹¤ëºÝ¤Ë¡¢ bind(2) ¤ä connect(2) ¤«¤éľÀÜÍøÍѤǤ­¤ë¡£

¤³¤Î´Ø¿ô¤¬ÍѤ¤¤ë addrinfo ¹½Â¤ÂΤˤϰʲ¼¤Î¥á¥ó¥Ð¡¼¤¬´Þ¤Þ¤ì¤Æ¤¤¤ë¡£

struct addrinfo {

    int     ai_flags;

    int     ai_family;

    int     ai_socktype;

    int     ai_protocol;

    size_t  ai_addrlen;

    struct sockaddr *ai_addr;

    char   *ai_canonname;

    struct addrinfo *ai_next;

};

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hints ¥Ñ¥é¥á¡¼¥¿¤Ë¤Ï¡¢´õ˾¤Î¥½¥±¥Ã¥È¤Î¥¿¥¤¥×¤ä¥×¥í¥È¥³¥ë ¤ò»ØÄꤹ¤ë¡£ hints ¤ò NULL ¤Ë¤¹¤ë¤³¤È¤Ï¡¢¤É¤ó¤Ê¥Í¥Ã¥È¥ï¡¼¥¯¥¢¥É¥ì¥¹¤ä¥×¥í¥È¥³¥ë¤Ç¤â¤è¤¤¤³¤È¤ò°ÕÌ£¤¹¤ë¡£ ¤³¤Î¥Ñ¥é¥á¡¼¥¿¤¬ NULL ¤Ç¤Ê¤¤¤È¤­¤Ï¡¢ addrinfo ¹½Â¤ÂΤؤΥݥ¤¥ó¥¿¤È¤Ê¤ë¡£ ¤³¤Î¹½Â¤ÂΤΠai_familiy, ai_socktype, ai_protocol ¥á¥ó¥Ð¡¼¤Ç¡¢´õ˾¤Î¥½¥±¥Ã¥È¥¿¥¤¥×¤Ê¤É¤ò»ØÄꤹ¤ë¡£ ai_family ¤Ë AF_UNSPEC ¤ò»ØÄꤹ¤ë¤È¡¢Ç¤°Õ¤Î¥×¥í¥È¥³¥ë¥Õ¥¡¥ß¥ê¡¼¤ò°ÕÌ£¤¹¤ë (Î㤨¤Ð IPv4 ¤ä IPv6)¡£ ai_socktype ¤ä ai_protocol ¤Ë 0 ¤ò»ØÄꤹ¤ë¤È¡¢ ƱÍͤËǤ°Õ¤Î¥½¥±¥Ã¥È¥¿¥¤¥×¤ä¥×¥í¥È¥³¥ë¤ò¼õÉÕ¤±¤ë¤³¤È¤ò°ÕÌ£¤¹¤ë¡£ ai_flags ¥á¥ó¥Ð¡¼¤Ë¤ÏÄɲ媥ץ·¥ç¥ó¤ò»ØÄꤹ¤ë (ÄêµÁ¤Ï²¼¤Î¤È¤ª¤ê)¡£ Ê£¿ô¤Î¥Õ¥é¥°¤ò»ØÄꤹ¤ë¤Ë¤Ï¡¢¤½¤ì¤é¤ÎÏÀÍý OR ¤ò¤È¤Ã¤Æ»ØÄꤹ¤ì¤Ð¤è¤¤¡£ hints ¥Ñ¥é¥á¡¼¥¿¤Î¤½¤Î¾¤Î¥á¥ó¥Ð¡¼¤Ë¤Ï¡¢ 0 (¤Þ¤¿¤Ï¥Ì¥ë¡¦¥Ý¥¤¥ó¥¿) ¤òÆþ¤ì¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£

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AI_CANONIDN

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getipnodebyaddr(3), getipnodebyname(3)