Linux Certif

Toute la documentation sur la certification Linux LPI

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send, sendto, sendmsg - ¥½¥±¥Ã¥È¤Ø¥á¥Ã¥»¡¼¥¸¤òÁ÷¤ë

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#include <sys/types.h>

#include <sys/socket.h>



ssize_t send(int s, const void *buf, size_t len, int flags);




ssize_t sendto(int s, const void *buf, size_t len, int flags,

               const struct sockaddr *to, socklen_t tolen);




ssize_t sendmsg(int s, const struct msghdr *msg, int flags);

ÀâÌÀ

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°ú¤­¿ô s ¤Ï¡¢¥Ç¡¼¥¿¤òÁ÷¿®¤¹¤ë¥Ñ¥±¥Ã¥È¤Î¥Õ¥¡¥¤¥ë¡¦¥Ç¥£¥¹¥¯¥ê¥×¥¿¤Ç¤¢¤ë¡£

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send() ¤Ç¤Ï¡¢ÇÛÁ÷¤Î¼ºÇÔ¤ÎÄÌÃΤÏÌÀ¼¨Åª¤Ë¹Ô¤ï¤ì¤ë¡£ ¥í¡¼¥«¥ë¦¤Ç¥¨¥é¡¼¤¬¸¡½Ð¤µ¤ì¤¿¾ì¹ç¤Ï¡¢ÊÖ¤êÃÍ -1 ¤È¤·¤ÆÄÌÃΤµ¤ì¤ë¡£

¥á¥Ã¥»¡¼¥¸¤¬¥½¥±¥Ã¥È¤ÎÁ÷¿®¥Ð¥Ã¥Õ¥¡¤ËÆþ¤ì¤ë¤³¤È¤¬¤Ç¤­¤Ê¤¤¾ì¹ç¡¢ send() ¤ÏÄ̾ï¤ÏÄä»ß (block) ¤¹¤ë (¥½¥±¥Ã¥È¤¬ÈóÄä»ß (non-blocking) I/O ¥â¡¼¥É ¤Ç¤Ê¤¤¾ì¹ç)¡£ÈóÄä»ß¥â¡¼¥É¤Î¾ì¹ç¤Ë¤Ï EAGAIN ¤òÊÖ¤¹¡£¤¤¤Ä¥Ç¡¼¥¿¤ò¤µ¤é¤ËÁ÷¿®¤Ç¤­¤ë¤è¤¦¤Ë¤Ê¤ë¤«¤òÃΤ뤿¤á¤Ë¡¢ select(2) ¥³¡¼¥ë¤ò»ÈÍѤ¹¤ë¤³¤È¤¬¤Ç¤­¤ë¡£

flags ¥Ñ¥é¥á¡¼¥¿¤Ï¡¢°Ê²¼¤Î¥Õ¥é¥°¤Î (0 ¸Ä°Ê¾å¤Î) ¥Ó¥Ã¥Èñ°Ì¤ÎÏÀÍýϤò ¤È¤Ã¤¿¤â¤Î¤ò»ØÄꤹ¤ë¡£

MSG_CONFIRM (Linux 2.3 °Ê¹ß¤Î¤ß)

žÁ÷½èÍý¤Ë¿ÊŸ¤¬¤¢¤Ã¤¿¡¢¤Ä¤Þ¤êÁê¼ê¦¤«¤éÀ®¸ù¤Î±þÅú¤ò¼õ¤±¤¿¤³¤È¤ò¥ê¥ó¥¯ÁØ¤Ë ÃΤ餻¤ë¡£¥ê¥ó¥¯Áؤ¬¤³¤ÎÄÌÃΤò¼õ¤±¼è¤é¤Ê¤«¤Ã¤¿¾ì¹ç¤Ë¤Ï¡¢Ä̾ï¤É¤ª¤ê (¥æ¥Ë¥­¥ã¥¹¥È ARP ¤ò»È¤¦¤Ê¤É¤ÎÊýË¡¤Ç) ¶á˵ (neighbour) ¤ÎºÆ¸¡º÷¤ò¹Ô¤¦¡£ SOCK_DGRAM ¤È SOCK_RAW ¤Î¥½¥±¥Ã¥È¤ËÂФ·¤Æ¤Î¤ßÍ­¸ú¤Ç¡¢¸½ºß¤Î¤È¤³¤í IPv4 ¤È IPv6 ¤Î¤ß¼ÂÁõ¤µ¤ì¤Æ¤¤¤ë¡£ ¾Ü¤·¤¯¤Ï arp(7) »²¾È¤Î¤³¤È¡£

MSG_DONTROUTE

¥Ñ¥±¥Ã¥È¤òÁ÷¤ê½Ð¤¹¤Î¤Ë¥²¡¼¥È¥¦¥§¥¤¤ò»ÈÍѤ»¤º¡¢ ľÀÜÀܳ¤µ¤ì¤Æ¤¤¤ë¥Í¥Ã¥È¥ï¡¼¥¯¾å¤Î¥Û¥¹¥È¤À¤±¤ËÁ÷¤ë¡£ Ä̾¤³¤Î¥Õ¥é¥°¤Ï¿ÇÃÇ (diagnostic) ¤ä¥ë¡¼¥Æ¥£¥ó¥°¡¦¥×¥í¥°¥é¥à¤Ë ¤è¤Ã¤Æ¤Î¤ß»ÈÍѤµ¤ì¤ë¡£¤³¤Î¥Õ¥é¥°¤Ï¡¢·ÐÏ©À©¸æ¤¬¹Ô¤ï¤ì¤ë¥×¥í¥È¥³¥ë¥Õ¥¡¥ß¥ê¡¼ ¤ËÂФ·¤Æ¤Î¤ßÄêµÁ¤µ¤ì¤Æ¤¤¤ë¡£¥Ñ¥±¥Ã¥È¥½¥±¥Ã¥È¤Ë¤ÏÄêµÁ¤µ¤ì¤Æ¤¤¤Ê¤¤¡£

MSG_DONTWAIT

ÈóÄä»ß (non-blocking) Áàºî¤òÍ­¸ú¤Ë¤¹¤ë¡£Áàºî¤¬Ää»ß¤µ¤ì¤ë¤è¤¦¤Ê¾ì¹ç¤Ë¤Ï EAGAIN ¤òÊÖ¤¹¤è¤¦¤Ë¤¹¤ë (fcntl(2) ¤Î F_SETFL ¤Ç O_NONBLOCK ¤ò»ØÄꤹ¤ë¤³¤È¤Ë¤è¤Ã¤Æ¤âÍ­¸ú¤Ë¤Ç¤­¤ë)¡£

MSG_EOR

¥ì¥³¡¼¥É¤Î½ªÎ»¤ò»Ø¼¨¤¹¤ë (SOCK_SEQPACKET ¤Î¤è¤¦¤Ë¤³¤Î³µÇ°¤ËÂбþ¤·¤Æ¤¤¤ë¥½¥±¥Ã¥È¼ïÊ̤ΤȤ­¤ËÍ­¸ú)¡£

MSG_MORE (Linux 2.4.4 °Ê¹ß)

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MSG_NOSIGNAL

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MSG_OOB

ÂÓ°è³° (out-of-band) ¥Ç¡¼¥¿¤ò¥µ¥Ý¡¼¥È¤¹¤ë¥½¥±¥Ã¥È (Î㤨¤Ð SOCK_STREAM) ¤Ç ÂÓ°è³° ¥Ç¡¼¥¿¤òÁ÷¤ë¡£²¼°Ì¥×¥í¥È¥³¥ë¤â ÂÓ°è³° ¥Ç¡¼¥¿¤ò¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤ëɬÍפ¬¤¢¤ë¡£

msghdr ¹½Â¤ÂΤÎÆâÍƤϰʲ¼¤ÎÄ̤ꡣ ³Æ¥Õ¥£¡¼¥ë¥É¤ÎÀµ³Î¤Êµ­½Ò¤Ë¤Ä¤¤¤Æ¤Ï recv(2) ¤È°Ê²¼¤ÎÀâÌÀ¤ò»²¾È¤¹¤ë¤³¤È¡£

struct msghdr {

    void         *msg_name;       /* ÄɲäΥ¢¥É¥ì¥¹ */

    socklen_t     msg_namelen;    /* ¥¢¥É¥ì¥¹¤Î¥µ¥¤¥º */

    struct iovec *msg_iov;        /* scatter/gather ÇÛÎó */

    size_t        msg_iovlen;     /* msg_iov ¤ÎÍ×ÁÇ¿ô */

    void         *msg_control;    /* Êä½õ¥Ç¡¼¥¿(¸å½Ò) */

    socklen_t     msg_controllen; /* Êä½õ¥Ç¡¼¥¿¥Ð¥Ã¥Õ¥¡Ä¹ */

    int           msg_flags;      /* ¼õ¿®¥á¥Ã¥»¡¼¥¸¤Î¥Õ¥é¥° */

};

msg_control ¤È msg_controllen ¥á¥ó¥Ð¡¼¤ò»ÈÍѤ·¤ÆÀ©¸æ¾ðÊó¤òÁ÷¿®¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¡£ ¥«¡¼¥Í¥ë¤¬½èÍý¤Ç¤­¤ëÀ©¸æ¥Ð¥Ã¥Õ¥¡¤Î¥½¥±¥Ã¥È¤¢¤¿¤ê¤ÎºÇÂçĹ¤Ï¡¢ sysctl ¥Ñ¥é¥á¡¼¥¿¤Î net.core.optmem_max ¤ÎÃͤËÀ©¸Â¤µ¤ì¤Æ¤¤¤ë¡£ socket(7) ¤ò»²¾È¡£

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EACCES

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EAGAIN ¤Þ¤¿¤Ï EWOULDBLOCK

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EBADF

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ECONNRESET

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EDESTADDRREQ

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EFAULT

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EINTR

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EINVAL

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EISCONN

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EMSGSIZE

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ENOBUFS

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ENOTCONN

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ENOTSOCK

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EOPNOTSUPP

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EPIPE

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POSIX.1-2001 ¤Ç¤Ï¡¢¹½Â¤ÂÎ msghdr ¤Î¥Õ¥£¡¼¥ë¥É msg_controllen ¤Ï socklen_t ·¿¤Ç¤¢¤ë¤Ù¤­¤À¤È¤µ¤ì¤Æ¤¤¤ë¤¬¡¢ ¸½ºß¤Î glibc (glibc 2.4) ¤Ç¤Ï size_t ·¿¤Ç¤¢¤ë¡£

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fcntl(2), getsockopt(2), recv(2), select(2), sendfile(2), shutdown(2), socket(2), write(2), cmsg(3), ip(7), socket(7), tcp(7), udp(7)