̾??

????

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#define _PATH_UTMP      "/var/run/utmp"
#define _PATH_WTMP      "/var/log/wtmp"
#define _PATH_LASTLOG   "/var/log/lastlog"

#define UT_NAMESIZE     16
#define UT_LINESIZE     8
#define UT_HOSTSIZE     16

struct lastlog {
        int32_t ll_time;		/* ?桼???????????????󤷤??? */
        char    ll_line[UT_LINESIZE];	/* ü????̾ */
        char    ll_host[UT_HOSTSIZE];	/* ?桼???νпȥۥ??? */
};

struct utmp {
        char    ut_line[UT_LINESIZE];	/* ü????̾ */
        char    ut_name[UT_NAMESIZE];	/* ?桼???Υ???????̾ */
        char    ut_host[UT_HOSTSIZE];	/* ?桼???νпȥۥ??? */
        int32_t ut_time;		/* ?桼???????????????󤷤??? */
};

lastlog ?ե??????ϡ? lastlog ??¤?Τ??????????Ǥ??ꡢ?桼???? UID ?ǥ????ǥå????????Ƥ??ޤ??? utmp ?ե??????ϡ? utmp ??¤?Τ??????????Ǥ??ꡢü?????ֹ? ( ttyslot(3) ????) ?ǥ????ǥå????????Ƥ??ޤ??? wtmp ?ե??????ϡ? utmp ??¤?Τ????????Х??ʥ??????ե??????Ǥ??ꡢ ?ե??????ν?ü???ɵ??????Ƥ????ޤ???

?ǥե????ȤǤϡ??桼???????????󤹤뤿?Ӥˡ? pam_lastlog(8) ?ץ????????? lastlog ?ե????????Υ桼???? UID ?򸡺????ޤ??? ?⤷???Ĥ??ä????硢?桼?????Ǹ??˥??????󤷤??????Υ????ॹ?????ס? ü???????ۥ???̾??ɸ?????Ϥ˽񤭽Ф????ޤ??? pam_lastlog(8) ?ץ????????ϡ????θ? lastlog ?ե??????˿?????????????????????Ͽ???ޤ???

?????? lastlog ?ؤε?Ͽ???񤭽Ф??줿???ǡ? utmp ?ե????뤬?????ץ󤵤졢?桼?????Ф??? utmp ??Ͽ???????????ޤ??? ???ε?Ͽ?ϡ??桼?????????????Ȥ??ƺ????????????ޤ??ݻ??????ޤ??? utmp ?ե??????ϡ? rwho(1), users(1), w(1), who(1) ?ץ????????ǻȤ????ޤ???

???ˡ? pam_lastlog(8) ?ץ????????? wtmp ?ե??????򥪡??ץ󤷡??桼???? utmp ??Ͽ???ɲä??ޤ??? ???θ??桼????ü?????????????????Ȥ????ȡ????̤? utmp ?쥳???ɤ???Ͽ?????ޤ??? ???ʤ??? ut_line ??Ŭ?ڤ????ꤵ?졢 ut_time ???????????ޤ????? ut_name ?? ut_host ?϶??Ǥ??????Τ???Ͽ?????ޤ? ( init(8) ????)?? wtmp ?ե??????ϡ? last(1) ?? ac(8) ?ץ????????ǻȤ????ޤ???

?????ѹ??䥷???åȥ????󡦥??֡??Ȥκݤˤϡ? ?ʲ??ι??ܤ? wtmp ?ե??????˵?Ͽ?????ޤ???

reboot

 

shutdown

?????ƥ??Υ??֡??Ȥ䥷???åȥ????󤬳??Ϥ??줿?? ut_line ?ե??????ɤ? ‘~’ ?ȸ???ʸ?????? ut_name ?ե??????????? reboot ?⤷???? shutdown ????Ͽ?????ޤ? ( shutdown(8) ?? reboot(8) ????)??

date

?????ƥ????郎??ư?⤷???ϼ?ư?ǹ??????줿 ( date(1) ????)?? ???ޥ???̾ date ???ե??????? ut_name ?˵?Ͽ?????ޤ??? ut_line ?ե??????????? ‘|’ ʸ???ϡ??ѹ????λ????򼨤??? ‘{’ ʸ???Ͽ??????????򼨤??Ƥ??ޤ???

??

???????Υե????뤬¸?ߤ??ʤ????硢 pam_lastlog(8) ?Ϥ??????????????ޤ????? ???????Υե??????ϡ???ư?Ǻ???????ɬ?פ??????ޤ???

utmp ?????? wtmp ?Υե????????Ф????̾????????ϡ??󶡤??줿 login(3), logout(3), logwtmp(3) ?桼?ƥ????ƥ??ؿ??ǹԤ??? ???????Υե??????ν񼰤??ۤʤ륷???ƥ??֤Ǥθߴ??????ݻ????٤??Ǥ???

??Ϣ?ե?????

/var/run/utmp

utmp ?ե????롣

/var/log/wtmp

wtmp ?ե????롣

/var/log/lastlog

lastlog ?ե????롣

??Ϣ????

????