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[linuxjm/jm.git] / manual / e2fsprogs / draft / man3 / uuid_generate.3

.\" Copyright 1999 Andreas Dilger (adilger@enel.ucalgary.ca)
.\"
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.\" Created  Wed Mar 10 17:42:12 1999, Andreas Dilger
.\"
.\" Japanese Version Copyright 1999 by NAKANO Takeo. All Rights Reserved.
.\" Translated Sat 23 Oct 1999 by NAKANO Takeo <nakano@apm.seikei.ac.jp>
.\" Updated Tue 16 Nov 1999 by NAKANO Takeo
.\"
.TH UUID_GENERATE 3 "May 2006" "E2fsprogs version 1.39"
.\"O .SH NAME
.SH ̾Á°
.\"O uuid_generate, uuid_generate_random, uuid_generate_time \- create a new unique UUID value
uuid_generate, uuid_generate_random, uuid_generate_time \- ¾¤È½Å¤Ê¤é¤Ê¤¤ UUID Ãͤò¿·¤·¤¯ºîÀ®¤¹¤ë
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.nf
.B #include <uuid/uuid.h>
.sp
.BI "void uuid_generate(uuid_t " out );
.BI "void uuid_generate_random(uuid_t " out );
.BI "void uuid_generate_time(uuid_t " out );
.fi
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O The
.\"O .B uuid_generate
.\"O function creates a new universally unique identifier (UUID).  The uuid will
.\"O be generated based on high-quality randomness from 
.\"O .IR /dev/urandom , 
.\"O if available.  If it is not available, then 
.\"O .B uuid_generate 
.\"O will use an alternative algorithm which uses the current time, the
.\"O local ethernet MAC address (if available), and random data generated
.\"O using a pseudo-random generator.
.B uuid_generate
´Ø¿ô¤Ï¿·¤·¤¤ UUID (universally unique identifier:
ÀäÂФ˾¤È¤Ï½Å¤Ê¤é¤Ê¤¤¼±ÊÌ»Ò) ¤òÀ¸À®¤¹¤ë¡£
UUID ¤ÎÀ¸À®¤Ë¤Ï¡¢
.I /dev/urandom
¤Î¤è¤¦¤Ê¼Á¤ÎÎɤ¤Íð¿ôȯÀ¸µ¡¹½¤¬ÍøÍѤǤ­¤ë¾ì¹ç¤Ï¤½¤ì¤òÍøÍѤ¹¤ë¡£
¤Ç¤­¤Ê¤¤¾ì¹ç¤Ë¤Ï¡¢
.B uuid_generate
¤ÏÊ̤Υ¢¥ë¥´¥ê¥º¥à¤òÍѤ¤¤ë¡£¤³¤Î¾ì¹ç¤Ï¸½ºß»þ¹ï¡¢
¥í¡¼¥«¥ë¤Ê¥¤¡¼¥µ¥Í¥Ã¥È¤Î MAC ¥¢¥É¥ì¥¹¤¬¼èÆÀ¤Ç¤­¤ì¤Ð¤½¤ÎÃÍ¡¢
¤ª¤è¤Óµ¼»÷Íð¿ôȯÀ¸µ¡¹½¤«¤éÀ¸À®¤µ¤ì¤¿Íð¿ô¤¬ÍѤ¤¤é¤ì¤ë¡£
.sp
.\"O The 
.\"O .B uuid_generate_random
.\"O function forces the use of the all-random UUID format, even if
.\"O a high-quality random number generator (i.e., 
.\"O .IR /dev/urandom )
.\"O is not available, in which case a pseudo-random
.\"O generator will be subsituted.  Note that the use of a pseudo-random
.\"O generator may compromise the uniqueness of UUID's
.\"O generated in this fashion.
.B uuid_generate_random
´Ø¿ô¤Ï¡¢¼Á¤ÎÎɤ¤Íð¿ôȯÀ¸µ¡¹½ (Î㤨¤Ð
.IR /dev/urandom )
¤¬ÍøÍѤǤ­¤Ê¤¤¾ì¹ç¤Ç¤â¡¢´°Á´¤Ë¥é¥ó¥À¥à¥Ù¡¼¥¹¤Î (¤Ä¤Þ¤ê»þ¹ï¤ä
MAC ¥¢¥É¥ì¥¹¤ò»È¤ï¤Ê¤¤) UUID ¥Õ¥©¡¼¥Þ¥Ã¥È¤òºî¤ê¤¿¤¤¾ì¹ç¤ËÍѤ¤¤ë¡£
¤³¤Î¾ì¹ç¤Ïµ¼»÷Íð¿ôȯÀ¸µ¡¹½¤¬Âå¤ï¤ê¤ËÍѤ¤¤é¤ì¤ë¡£
µ¼»÷Íð¿ôȯÀ¸µ¡¹½¤òÍøÍѤ¹¤ë¤È¡¢¤³¤Î¤è¤¦¤ËÀ¸À®¤µ¤ì¤¿ UUID ¤Î
°ì°ÕÀ­¤ÏÎô²½¤¹¤ë¤«¤â¤·¤ì¤Ê¤¤¤³¤È¤ËÃí°Õ¤¹¤ë¤³¤È¡£
.sp
.\"O The
.\"O .B uuid_generate_time 
.\"O function forces the use of the alternative algorithm which uses the
.\"O current time and the local ethernet MAC address (if available).
.\"O This algorithm used to be the default one used to generate UUID, but
.\"O because of the use of the ethernet MAC address, it can leak
.\"O information about when and where the UUID was generated.  This can cause
.\"O privacy problems in some applications, so the
.\"O .B uuid_generate
.\"O function only uses this algorithm if a high-quality source of
.\"O randomness is not available.  
.B uuid_generata_time
´Ø¿ô¤Ï¡¢ÂåÂØ¥¢¥ë¥´¥ê¥º¥à¤ò»È¤¤¤¿¤¤¾ì¹ç¤ËÍѤ¤¤ë¡£
¤³¤ì¤Ï¸½ºß»þ¹ï¤È (¤¢¤ì¤Ð) ¥¤¡¼¥µ¥Í¥Ã¥È¤Î MAC ¥¢¥É¥ì¥¹¤òÍѤ¤¤ë¡£
¤³¤Î¥¢¥ë¥´¥ê¥º¥à¤Ï¤«¤Ä¤Æ UUID À¸À®ÊýË¡¤Î¥Ç¥Õ¥©¥ë¥È¤Ç¤¢¤Ã¤¿¤¬¡¢
¥¤¡¼¥µ¥Í¥Ã¥È¤Î MAC ¥¢¥É¥ì¥¹¤òÍѤ¤¤ë¤Î¤Ç¡¢¤¤¤Ä¤É¤³¤Ç UUID ¤¬À¸À®
¤µ¤ì¤¿¤«¤Î¾ðÊ󤬥꡼¥¯¤·¤Æ¤·¤Þ¤¦¡£¤³¤ì¤Ï¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ë¤è¤Ã¤Æ¤Ï
¥×¥é¥¤¥Ð¥·¡¼¤ÎÌäÂê¤òµ¯¤³¤¹¤³¤È¤¬¤¢¤ë¤Î¤Ç¡¢
.B uuid_generate
´Ø¿ô¤Ï¼Á¤Î¹â¤¤Íð¿ôȯÀ¸µ¡¹½¤¬ÍøÍѤǤ­¤Ê¤¤¾ì¹ç¤Ë¸Â¤Ã¤Æ
¤³¤Î¥¢¥ë¥´¥ê¥º¥à¤òÍѤ¤¤ë¤è¤¦¤Ë¤Ê¤Ã¤¿¡£
.sp
.\"O The UUID is 16 bytes (128 bits) long, which gives approximately 3.4x10^38
.\"O unique values (there are approximately 10^80 elemntary particles in
.\"O the universe according to Carl Sagan's
.\"O .IR Cosmos ).
.\"O The new UUID can reasonably be considered unique among all UUIDs created
.\"O on the local system, and among UUIDs created on other systems in the past
.\"O and in the future.
UUID ¤Ï 16 ¥Ð¥¤¥È (128 ¥Ó¥Ã¥È) Ĺ¤Ç¡¢¤ª¤è¤½ 3.4x10^38 ¤³¤Î
¥æ¥Ë¡¼¥¯¤ÊÃͤòÍ¿¤¨¤ë (Carl Segan ¤Î
.I Cosmos
¤Ë¤è¤ì¤Ð¡¢Á´±§Ãè¤Ë¤¢¤ëÁÇγ»Ò¤Î¸Ä¿ô¤Ï 10^80 ¤À¤½¤¦¤Ç¤¢¤ë)¡£
¿·¤¿¤Ëºî¤é¤ì¤¿ UUID ¤Ï¡¢¥í¡¼¥«¥ë¤Ê¥·¥¹¥Æ¥à¤ä³°Éô¤Î¥·¥¹¥Æ¥à¤Ë¤è¤Ã¤Æ
²áµî¤Þ¤¿¤Ï̤Íè¤ËÀ¸À®¤µ¤ì¤¿/¤µ¤ì¤ë UUID ¤Î¤¤¤º¤ì¤È¤â°Û¤Ê¤ë¤È
¹Í¤¨¤ë¤³¤È¤¬¤Ç¤­¤ë¡£
.\"O .SH RETURN VALUE
.SH ÊÖ¤êÃÍ
.\"O The newly created UUID is returned in the memory location pointed to by
.\"O .IR out .
¿·¤¿¤ËÀ¸À®¤µ¤ì¤¿ UUID ¤¬¡¢
.I out
¤Î»Ø¤¹¥á¥â¥ê°ÌÃÖ¤ËÊÖ¤µ¤ì¤ë¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
OSF DCE 1.1
.\"O .SH AUTHOR
.SH Ãø¼Ô
Theodore Y. Ts'o
.\"O .SH AVAILABILITY
.SH Æþ¼êÊýË¡
.UR http://e2fsprogs.sourceforge.net/
http://e2fsprogs.sourceforge.net/
.UE
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR uuid (3),
.BR uuidgen (1),
.BR uuid_clear (3),
.BR uuid_compare (3),
.BR uuid_copy (3),
.BR uuid_is_null (3),
.BR uuid_parse (3),
.BR uuid_time (3),
.BR uuid_unparse (3)