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MSGCTL
Section: Linux Programmer's Manual (2)Updated: 18 Feb 2001
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msgctl - ¥á¥Ã¥»¡¼¥¸À©¸æÁàºî½ñ¼°
# include <sys/types.h> # include <sys/ipc.h> # include <sys/msg.h>
int msgctl ( int msqid, int cmd, struct msqid_ds *buf )
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¤³¤Î´Ø¿ô¤Ï¥á¥Ã¥»¡¼¥¸¡¦¥¥å¡¼¼±ÊÌ»Ò msqid ¤Ç»ØÄꤵ¤ì¤¿¥á¥Ã¥»¡¼¥¸¡¦¥¥å¡¼ (message queue) ¤ËÂФ·¤Æ cmd ¤Ç»ØÄꤵ¤ì¤¿À©¸æÁàºî¤ò¹Ô¤Ê¤¦¡£ cmd ¤Ë»È¤¨¤ëÃͤÏ:- IPC_STAT
- ¥á¥Ã¥»¡¼¥¸¡¦¥¥å¡¼¡¦¥Ç¡¼¥¿¹½Â¤ÂΤ«¤é buf ¤Ç»ØÄꤵ¤ì¤¿¹½Â¤ÂΤ˥ǡ¼¥¿¤ò¥³¥Ô¡¼¤¹¤ë¡£ ¥æ¡¼¥¶¡¼¤Ï¥á¥Ã¥»¡¼¥¸¡¦¥¥å¡¼¤ËÂФ¹¤ëÆɤ߹þ¤ßµö²Ä¤ò»ý¤Ã¤Æ¤¤¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
- IPC_SET
-
buf
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msqid_ds
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msg_ctime
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buf
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msqid_ds ¹½Â¤ÂÎ
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msg_perm.uid msg_perm.gid msg_perm.mode /* ²¼°Ì 9 ¥Ó¥Ã¥È¤Î¤ß */ msg_qbytes¸Æ¤Ó½Ð¤·¤¿¥×¥í¥»¥¹¤Î¼Â¸ú (effective) ¥æ¡¼¥¶¡¼ ID ¤Ï¥¹¡¼¥Ñ¡¼¡¦¥æ¡¼¥¶¡¼¡¢ ¥á¥Ã¥»¡¼¥¸¡¦¥¥å¡¼¤ÎºîÀ®¼Ô (creator)¡¢½êÍ¼Ô (owner) ¤Î ¤¤¤º¤ì¤«¤Ç¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£ ¥¹¡¼¥Ñ¡¼¡¦¥æ¡¼¥¶¡¼¤Î¤ß¤¬ msg_qbytes ¤ò¥·¥¹¥Æ¥à¡¦¥Ñ¥é¥á¡¼¥¿¡¼¤Î MSGMNB ¤òĶ¤¨¤ÆÀßÄꤹ¤ë¤³¤È¤¬¤Ç¤¤ë¡£
- IPC_RMID
- ¥á¥Ã¥»¡¼¥¸¡¦¥¥å¡¼¤È¤½¤Î¥Ç¡¼¥¿¹½Â¤ÂΤò¤¿¤À¤Á¤Ëºï½ü¤¹¤ë¡£ Á´¤Æ¤ÎÆɤ߹þ¤ß¤ä½ñ¤¹þ¤ß¤òÂԤäƤ¤¤¿¥×¥í¥»¥¹¤Ï (¥¨¥é¡¼¤È¤Ê¤ê errno ¤Ë EIDRM ¤¬ÀßÄꤵ¤ì¤Æ¡¢) ºÆ³« (awake) ¤µ¤ì¤ë¡£ ¸Æ¤Ó½Ð¤·¤¿¥×¥í¥»¥¹¤Î¼Â¸ú¥æ¡¼¥¶¡¼ ID ¤Ï¥¹¡¼¥Ñ¡¼¡¦¥æ¡¼¥¶¡¼¡¢ ¥á¥Ã¥»¡¼¥¸¡¦¥¥å¡¼¤ÎºîÀ®¼Ô (creator)¡¢½êÍ¼Ô (owner) ¤Î ¤¤¤º¤ì¤«¤Ç¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
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À®¸ù¤·¤¿¾ì¹ç¤Ï 0 ¤¬ÊÖ¤µ¤ì¤ë¡£¤½¤¦¤Ç¤Ê¤±¤ì¤Ð -1 ¤¬ÊÖ¤µ¤ì¡¢ errno ¤¬¤½¤Î¥¨¥é¡¼¤ò¼¨¤¹¤è¤¦¤ËÀßÄꤵ¤ì¤ë¡£¥¨¥é¡¼
¼ºÇÔ¤·¤ÆÊÖ¤µ¤ì¤¿¾ì¹ç¤Ï errno ¤Ë°Ê²¼¤ÎÃͤÎÃæ¤Î¤É¤ì¤«°ì¤Ä¤¬ÀßÄꤵ¤ì¤ë:- EACCES
- °ú¤¿ô cmd ¤¬ IPC_STAT ¤ËÅù¤·¤¤¤¬¡¢¸Æ¤Ó½Ð¤·¤¿¥×¥í¥»¥¹¤¬¥á¥Ã¥»¡¼¥¸¡¦¥¥å¡¼ msqid ¤ËÂФ¹¤ëÆɤ߹þ¤ßµö²Ä¤ò»ý¤Ã¤Æ¤¤¤Ê¤¤¡£
- EFAULT
- °ú¤¿ô cmd ¤¬ IPC_SET ¤« IPC_STAT ¤Ç¡¢ buf ¤Ç»Ø¤µ¤ì¤Æ¤¤¤ë¥¢¥É¥ì¥¹¤¬¥¢¥¯¥»¥¹²Äǽ¤Ç¤Ê¤¤¡£
- EIDRM
- ¥á¥Ã¥»¡¼¥¸¡¦¥¥å¡¼¤¬ºï½ü¤µ¤ì¤¿¡£
- EINVAL
- cmd ¤Þ¤¿¤Ï msqid ¤ËÉÔÀµ¤ÊÃͤ¬ÀßÄꤵ¤ì¤¿¡£
- EPERM
- °ú¤¿ô cmd ¤¬ IPC_SET ¤« IPC_RMID ¤Ç¡¢¸Æ¤Ó½Ð¤·¤¿¥×¥í¥»¥¹¤Î¼Â¸ú¥æ¡¼¥¶¡¼ ID ¤¬ ¤½¤Î¥³¥Þ¥ó¥É¤ò¼Â¹Ô¤¹¤ë¸¢Íø¤ò»ý¤¿¤Ê¤¤¡£ ¤³¤ì¤Ï¥¹¡¼¥Ñ¡¼¡¦¥æ¡¼¥¶¡¼°Ê³°¤Î¥×¥í¥»¥¹¤¬ msg_qbytes ¤ò¥·¥¹¥Æ¥à¡¦¥Ñ¥é¥á¡¼¥¿¡¼¤Î MSGMNB ¤Ç»ØÄꤵ¤ì¤¿ÃͰʾå¤ËÁý²Ã¤µ¤»¤è¤¦¤È¤·¤¿¾ì¹ç¤Ë¤âȯÀ¸¤¹¤ë¤³¤È¤ËÃí°Õ¤¹¤ë¤³¤È¡£
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IPC_INFO, MSG_STAT, MSG_INFO À©¸æ¥³¡¼¥ë¤Ï ipcs(8) ¥×¥í¥°¥é¥à¤Ç»ñ¸»¤Î³ä¤êÅö¤Æ¾ðÊó¤òÄ󶡤¹¤ë¤¿¤á¤Ë»ÈÍѤµ¤ì¤Æ¤¤¤ë¡£ ¾ÍèŪ¤Ë¤³¤ì¤é¤Ï proc ¥Õ¥¡¥¤¥ë¡¦¥·¥¹¥Æ¥à¡¦¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹¤ò»È¤¦¤è¤¦¤Ë ½¤Àµ¤µ¤ì¤ë¤«¤â¤·¤ì¤Ê¤¤¡£¹½Â¤ÂÎ msqid_ds Æâ¤Î¿¤¯¤Î¥Õ¥£¡¼¥ë¥É¤Ï¡¢ Linux 2.2 ¤Ç¤Ïû¤«¤Ã¤¿¤¬¡¢Linux 2.4 ¤Ç¤ÏŤ¯¤Ê¤Ã¤¿¡£ ¤³¤ÎÍøÅÀ¤òÀ¸¤«¤¹¤Ë¤Ï¡¢glibc-2.1.91 °Ê¹ß¤Î´Ä¶²¼¤Ç ºÆ¥³¥ó¥Ñ¥¤¥ë¤¹¤ì¤Ð½½Ê¬¤Ç¤¢¤ë¡£ ¥«¡¼¥Í¥ë¤Ï¿·¤·¤¤·Á¼°¤Î¸Æ¤Ó½Ð¤·¤È¸Å¤¤·Á¼°¤Î¸Æ¤Ó½Ð¤·¤ò cmd Æâ¤Î IPC_64 ¥Õ¥é¥°¤Ç¶èÊ̤¹¤ë¡£
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SVr4, SVID. SVID ¤Ë¤Ï EIDRM ¥¨¥é¡¼¤Ë¤Ä¤¤¤Æ¤Îµ½Ò¤Ï¤Ê¤¤¡£´ØÏ¢¹àÌÜ
ipc(5), msgget(2), msgsnd(2), msgrcv(2)