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[linuxjm/jm.git] / manual / LDP_man-pages / release / man5 / utmp.5

.\" Copyright (c) 1993 Michael Haardt (michael@cantor.informatik.rwth-aachen.de),
.\" Fri Apr  2 11:32:09 MET DST 1993
.\"
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"
.\" The GNU General Public License's references to "object code"
.\" and "executables" are to be interpreted as the output of any
.\" document formatting or typesetting system, including
.\" intermediate and printed output.
.\"
.\" This manual is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public
.\" License along with this manual; if not, write to the Free
.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
.\" USA.
.\"
.\" Modified 1993-07-25 by Rik Faith (faith@cs.unc.edu)
.\" Modified 1995-02-26 by Michael Haardt
.\" Modified 1996-07-20 by Michael Haardt
.\" Modified 1997-07-02 by Nicolas Lichtmaier <nick@debian.org>
.\" Modified 2004-10-31 by aeb, following Gwenole Beauchesne
.\"
.\" Japanese Version Copyright (c) 1997 Kazuyuki Tanisako
.\"         all rights reserved.
.\" Translated 1998-02-16, Kazuyuki Tanisako <tanisako@osa.dec-j.co.jp>
.\" Updated 2003-01-20, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated 2005-02-21, Akihiro MOTOKI
.\" Updated 2005-10-06, Akihiro MOTOKI
.\" Updated 2008-08-11, Akihiro MOTOKI, LDP v3.05
.\"
.TH UTMP 5 2008-10-10 "Linux" "Linux Programmer's Manual"
.SH ̾Á°
utmp, wtmp \- ¥í¥°¥¤¥óµ­Ï¿
.SH ½ñ¼°
.B #include <utmp.h>
.SH ÀâÌÀ
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.in +4n
.nf
.sp
/* Values for ut_type field, below */

#define EMPTY         0 /* Record does not contain valid info
                           (formerly known as UT_UNKNOWN on Linux) */
#define RUN_LVL       1 /* Change in system run-level (see
                           \fBinit\fP(8)) */
#define BOOT_TIME     2 /* Time of system boot (in \fIut_tv\fP) */
#define NEW_TIME      3 /* Time after system clock change
                           (in \fIut_tv\fP) */
#define OLD_TIME      4 /* Time before system clock change
                           (in \fIut_tv\fP) */
#define INIT_PROCESS  5 /* Process spawned by \fBinit\fP(8) */
#define LOGIN_PROCESS 6 /* Session leader process for user login */
#define USER_PROCESS  7 /* Normal process */
#define DEAD_PROCESS  8 /* Terminated process */
#define ACCOUNTING    9 /* Not implemented */

#define UT_LINESIZE      32
#define UT_NAMESIZE      32
#define UT_HOSTSIZE     256

struct exit_status {              /* Type for ut_exit, below */
    short int e_termination;      /* Process termination status */
    short int e_exit;             /* Process exit status */
};

struct utmp {
    short   ut_type;              /* Type of record */
    pid_t   ut_pid;               /* PID of login process */
    char    ut_line[UT_LINESIZE]; /* Device name of tty \- "/dev/" */
    char    ut_id[4];             /* Terminal name suffix,
                                     or inittab(5) ID */
    char    ut_user[UT_NAMESIZE]; /* Username */
    char    ut_host[UT_HOSTSIZE]; /* Hostname for remote login, or
                                     kernel version for run-level
                                     messages */
    struct  exit_status ut_exit;  /* Exit status of a process
                                     marked as DEAD_PROCESS; not
                                     used by Linux init(8) */
    /* ut_session ¤È ut_tv ¥Õ¥£¡¼¥ë¥É¤Ï¡¢32¥Ó¥Ã¥È¤Ç¥³¥ó¥Ñ¥¤¥ë¤µ¤ì¤¿¾ì¹ç¤È
       64¥Ó¥Ã¥È¤Ç¥³¥ó¥Ñ¥¤¥ë¤µ¤ì¤¿¾ì¹ç¤ÇƱ¤¸¥µ¥¤¥º¤Ç¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
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       ¥Ç¡¼¥¿¥Õ¥¡¥¤¥ë¤È¶¦Í­¥á¥â¥ê¤ò¶¦Í­¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¤è¤¦¤Ë¤Ê¤ë¡£ */

#if __WORDSIZE == 64 && defined __WORDSIZE_COMPAT32
    int32_t ut_session;           /* Session ID (\fBgetsid\fP(2)),
                                     used for windowing */
    struct {
        int32_t tv_sec;           /* Seconds */
        int32_t tv_usec;          /* Microseconds */
    } ut_tv;                      /* Time entry was made */
#else
     long   ut_session;           /* Session ID */
     struct timeval ut_tv;        /* Time entry was made */
#endif

    int32_t ut_addr_v6[4];        /* Internet address of remote
                                     host; IPv4 address uses
                                     just ut_addr_v6[0] */
    char __unused[20];            /* Reserved for future use */
};

/* Backwards compatibility hacks */
#define ut_name ut_user
#ifndef _NO_UT_TIME
#define ut_time ut_tv.tv_sec
#endif
#define ut_xtime ut_tv.tv_sec
#define ut_addr ut_addr_v6[0]
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.I int32_t
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.IR tv_sec ,
.I tv_usec
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\fIut_tv\fP ¤Ï \fIstruct timeval\fP ¤ÈƱ¤¸¥µ¥¤¥º¤È¤Ï¸Â¤é¤Ê¤¤¤Î¤Ç¡¢
.in +4n
.nf
.sp
gettimeofday((struct timeval *) &ut.ut_tv, NULL);
.fi
.in

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.in +4n
.nf
.sp
struct utmp ut;
struct timeval tv;

gettimeofday(&tv, NULL);
ut.ut_tv.tv_sec = tv.tv_sec;
ut.ut_tv.tv_usec = tv.tv_usec;
.fi
.in
.PP
utmp ¹½Â¤ÂÎ¤Ï libc5 ¤«¤é libc6 ¤ÇÊѹ¹¤µ¤ì¤¿¡£¤½¤Î¤¿¤áÀΤΠlibc5 ¤Î¹½Â¤ÂÎ
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.IR /var/run/utmp " ¤ä " /var/log/wtmp
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.SH ¥Ð¥°
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.SH ´ØÏ¢¹àÌÜ
.BR ac (1),
.BR date (1),
.BR last (1),
.BR login (1),
.BR who (1),
.BR getutent (3),
.BR getutmp (3),
.BR login (3),
.BR logout (3),
.BR logwtmp (3),
.BR updwtmp (3),
.BR init (8)