1 .\" Copyright (c) 1993 Michael Haardt (michael@cantor.informatik.rwth-aachen.de),
2 .\" Fri Apr 2 11:32:09 MET DST 1993
4 .\" This is free documentation; you can redistribute it and/or
5 .\" modify it under the terms of the GNU General Public License as
6 .\" published by the Free Software Foundation; either version 2 of
7 .\" the License, or (at your option) any later version.
9 .\" The GNU General Public License's references to "object code"
10 .\" and "executables" are to be interpreted as the output of any
11 .\" document formatting or typesetting system, including
12 .\" intermediate and printed output.
14 .\" This manual is distributed in the hope that it will be useful,
15 .\" but WITHOUT ANY WARRANTY; without even the implied warranty of
16 .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 .\" GNU General Public License for more details.
19 .\" You should have received a copy of the GNU General Public
20 .\" License along with this manual; if not, write to the Free
21 .\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
24 .\" Modified 1993-07-25 by Rik Faith (faith@cs.unc.edu)
25 .\" Modified 1995-02-26 by Michael Haardt
26 .\" Modified 1996-07-20 by Michael Haardt
27 .\" Modified 1997-07-02 by Nicolas Lichtmaier <nick@debian.org>
28 .\" Modified 2004-10-31 by aeb, following Gwenole Beauchesne
30 .\" Japanese Version Copyright (c) 1997 Kazuyuki Tanisako
31 .\" all rights reserved.
32 .\" Translated 1998-02-16, Kazuyuki Tanisako <tanisako@osa.dec-j.co.jp>
33 .\" Updated 2003-01-20, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
34 .\" Updated 2005-02-21, Akihiro MOTOKI
35 .\" Updated 2005-10-06, Akihiro MOTOKI
36 .\" Updated 2008-08-11, Akihiro MOTOKI, LDP v3.05
38 .TH UTMP 5 2011-09-28 "Linux" "Linux Programmer's Manual"
41 .\"O utmp, wtmp \- login records
42 utmp, wtmp \- ¥í¥°¥¤¥óµÏ¿
50 .\"O file allows one to discover information about who is currently using the
52 .\"O There may be more users currently using the system, because not
53 .\"O all programs use utmp logging.
55 ¥Õ¥¡¥¤¥ë¤ò¸«¤ë¤³¤È¤Ç¡¢¸½ºß郎¥·¥¹¥Æ¥à¤ò»È¤Ã¤Æ¤¤¤ë¤«¤È¤¤¤¦¾ðÊó
56 ¤¬ÆÀ¤é¤ì¤ë¡£¤¿¤À¤¹¤Ù¤Æ¤Î¥×¥í¥°¥é¥à¤¬ utmp ¥Õ¥¡¥¤¥ë¤ò
57 ¹¹¿·¤·¤Æ¤¤¤ë¤ï¤±¤Ç¤Ï¤Ê¤¤¤Î¤Ç¡¢¼ÂºÝ¤Ë¤Ï¤½¤ì°Ê¾å¤Î¥æ¡¼¥¶¡¼¤¬
58 ¥·¥¹¥Æ¥à¤ò»È¤Ã¤Æ¤¤¤ë²ÄǽÀ¤¬¤¢¤ë¡£
62 .\"O must not be writable by the user class "other",
63 .\"O because many system programs (foolishly)
64 .\"O depend on its integrity.
65 .\"O You risk faked system logfiles and
66 .\"O modifications of system files if you leave
68 .\"O writable to any user other than the owner and group owner of the file.
70 (¶ò¤«¤Ë¤â) ¿¤¯¤Î¥·¥¹¥Æ¥à¥×¥í¥°¥é¥à¤¬¤½¤ÎÀ°¹çÀ¤Ë°Í¸¤·¤Æ¤¤¤ë¤Î¤Ç¡¢
72 ¥Õ¥¡¥¤¥ë¤Ï "other" ¤ËʬÎव¤ì¤ë¥æ¡¼¥¶¤ËÂФ·¤Æ
73 ½ñ¤¹þ¤ß²Äǽ¤Ë¤·¤Æ¤Ï¤Ê¤é¤Ê¤¤¡£
74 ¥Õ¥¡¥¤¥ë¤Î½êͼԤȥ°¥ë¡¼¥×¥ª¡¼¥Ê¡¼°Ê³°¤Î¥æ¡¼¥¶¤ËÂФ·¤Æ
76 ¥Õ¥¡¥¤¥ë¤ò½ñ¤¹þ¤ß²Äǽ¤Ê¾õÂ֤ˤ·¤Æ¤ª¤¯¤È¡¢
77 ¥·¥¹¥Æ¥à¤Î¥í¥°¥Õ¥¡¥¤¥ë¤òµ¶Â¤¤µ¤ì¤¿¤ê¡¢¥·¥¹¥Æ¥à¥Õ¥¡¥¤¥ë¤Î
78 ²þ¤¶¤ó¤ò¼õ¤±¤ë¤È¤¤¤Ã¤¿¥ê¥¹¥¯¤òÈȤ¹¤³¤È¤Ë¤Ê¤ë¡£
80 .\"O The file is a sequence of
83 .\"O declared as follows in
85 .\"O (note that this is only one of several definitions
86 .\"O around; details depend on the version of libc):
89 ¹½Â¤ÂΤ竤êÊÖ¤·¤Ç¹½À®¤µ¤ì¤ë¡£
92 ¤Ç°Ê²¼¤Î¤è¤¦¤ËÄêµÁ¤µ¤ì¤Æ¤¤¤ë
93 (¤³¤³¤Ëµ½Ò¤·¤Æ¤¢¤ë¤Î¤Ï´ö¤Ä¤«¤ÎÂç¤Þ¤«¤ÊÄêµÁ¤Î¤ß¤Ç¡¢
94 ¾ÜºÙ¤Ï libc ¤Î¥Ð¡¼¥¸¥ç¥ó¤Ë¤è¤êÊѤï¤ë¤³¤È¤ËÃí°Õ¤¬É¬ÍפǤ¢¤ë)¡£
98 /* Values for ut_type field, below */
100 #define EMPTY 0 /* Record does not contain valid info
101 (formerly known as UT_UNKNOWN on Linux) */
102 #define RUN_LVL 1 /* Change in system run-level (see
104 #define BOOT_TIME 2 /* Time of system boot (in \fIut_tv\fP) */
105 #define NEW_TIME 3 /* Time after system clock change
107 #define OLD_TIME 4 /* Time before system clock change
109 #define INIT_PROCESS 5 /* Process spawned by \fBinit\fP(8) */
110 #define LOGIN_PROCESS 6 /* Session leader process for user login */
111 #define USER_PROCESS 7 /* Normal process */
112 #define DEAD_PROCESS 8 /* Terminated process */
113 #define ACCOUNTING 9 /* Not implemented */
115 #define UT_LINESIZE 32
116 #define UT_NAMESIZE 32
117 #define UT_HOSTSIZE 256
119 struct exit_status { /* Type for ut_exit, below */
120 short int e_termination; /* Process termination status */
121 short int e_exit; /* Process exit status */
125 short ut_type; /* Type of record */
126 pid_t ut_pid; /* PID of login process */
127 char ut_line[UT_LINESIZE]; /* Device name of tty \- "/dev/" */
128 char ut_id[4]; /* Terminal name suffix,
130 char ut_user[UT_NAMESIZE]; /* Username */
131 char ut_host[UT_HOSTSIZE]; /* Hostname for remote login, or
132 kernel version for run-level
134 struct exit_status ut_exit; /* Exit status of a process
135 marked as DEAD_PROCESS; not
136 used by Linux init(8) */
137 .\"O /* The ut_session and ut_tv fields must be the same size when
138 .\"O compiled 32- and 64-bit. This allows data files and shared
139 .\"O memory to be shared between 32- and 64-bit applications. */
140 /* ut_session ¤È ut_tv ¥Õ¥£¡¼¥ë¥É¤Ï¡¢32¥Ó¥Ã¥È¤Ç¥³¥ó¥Ñ¥¤¥ë¤µ¤ì¤¿¾ì¹ç¤È
141 64¥Ó¥Ã¥È¤Ç¥³¥ó¥Ñ¥¤¥ë¤µ¤ì¤¿¾ì¹ç¤ÇƱ¤¸¥µ¥¤¥º¤Ç¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¡£
142 ¤³¤¦¤¹¤ë¤³¤È¤Ç¡¢32¥Ó¥Ã¥È¤È64¥Ó¥Ã¥È¤Î¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ç¡¢
143 ¥Ç¡¼¥¿¥Õ¥¡¥¤¥ë¤È¶¦Í¥á¥â¥ê¤ò¶¦Í¤¹¤ë¤³¤È¤¬¤Ç¤¤ë¤è¤¦¤Ë¤Ê¤ë¡£ */
145 #if __WORDSIZE == 64 && defined __WORDSIZE_COMPAT32
146 int32_t ut_session; /* Session ID (\fBgetsid\fP(2)),
147 used for windowing */
149 int32_t tv_sec; /* Seconds */
150 int32_t tv_usec; /* Microseconds */
151 } ut_tv; /* Time entry was made */
153 long ut_session; /* Session ID */
154 struct timeval ut_tv; /* Time entry was made */
157 int32_t ut_addr_v6[4]; /* Internet address of remote
158 host; IPv4 address uses
159 just ut_addr_v6[0] */
160 char __unused[20]; /* Reserved for future use */
163 /* Backward compatibility hacks */
164 #define ut_name ut_user
166 #define ut_time ut_tv.tv_sec
168 #define ut_xtime ut_tv.tv_sec
169 #define ut_addr ut_addr_v6[0]
173 .\"O This structure gives the name of the special file associated with the
174 .\"O user's terminal, the user's login name, and the time of login in the form
177 .\"O String fields are terminated by a null byte (\(aq\e0\(aq)
178 .\"O if they are shorter than the size
180 ¤³¤Î¹½Â¤ÂΤ«¤é¥æ¡¼¥¶¡¼¤Î»È¤Ã¤Æ¤¤¤ëüËö¤Î¥¹¥Ú¥·¥ã¥ë¥Õ¥¡¥¤¥ë̾¡¢
181 ¥æ¡¼¥¶¡¼¤Î¥í¥°¥¤¥ó̾¡¢
183 ·Á¼°¤Ç¤Î)¥í¥°¥¤¥ó»þ¹ï¤¬¤ï¤«¤ë¡£Ê¸»úÎó¥Õ¥£¡¼¥ë¥É¤Ï¡¢
184 ¥Õ¥£¡¼¥ë¥É¤ÎŤµ¤è¤êʸ»úÎó¤¬Ã»¤¤¾ì¹ç¤Ë¤Ï¡¢
185 NULL ¥Ð¥¤¥È (\(aq\e0\(aq) ¤Ë¤è¤Ã¤Æ½ªÃ¼¤µ¤ì¤ë¡£
187 .\"O The first entries ever created result from
190 .\"O .BR inittab (5).
191 .\"O Before an entry is processed, though,
193 .\"O cleans up utmp by setting \fIut_type\fP to \fBDEAD_PROCESS\fP, clearing
194 .\"O \fIut_user\fP, \fIut_host\fP, and \fIut_time\fP with null bytes for each
195 .\"O record which \fIut_type\fP is not \fBDEAD_PROCESS\fP or \fBRUN_LVL\fP
196 .\"O and where no process with PID \fIut_pid\fP exists.
197 .\"O If no empty record
198 .\"O with the needed \fIut_id\fP can be found,
200 .\"O creates a new one.
201 .\"O It sets \fIut_id\fP from the inittab, \fIut_pid\fP and \fIut_time\fP to the
202 .\"O current values, and \fIut_type\fP to \fBINIT_PROCESS\fP.
207 ¤ò½èÍý¤¹¤ë¤³¤È¤Çºî¤é¤ì¤ë¡£
208 ¤¢¤ë¥¨¥ó¥È¥ê¤ò½èÍý¤¹¤ëÁ°¤Ë¡¢
210 ¤Ï \fIut_type\fP ¤ò \fBDEAD_PROCESS\fP ¤Ë½é´ü²½¤¹¤ë¡£
212 \fIut_type\fP ¤¬ \fBDEAD_PROCESS\fP ¤È \fBRUN_LVL\fP ¤Î¤¤¤º¤ì¤Ç¤â¤Ê¤¯¡¢
213 ¤«¤Ä PID ¤¬ \fIut_pid\fP ¤Ç¤¢¤ë¥×¥í¥»¥¹¤¬¤¤¤Ê¤¤¾ì¹ç¤Ï¡¢\fIut_user\fP,
214 \fIut_host\fP, \fIut_time\fP ¤ò¥Ì¥ë¥Ð¥¤¥È¤Ç¥¯¥ê¥¢¤·¤Æ½é´ü²½¤ò¹Ô¤¦¡£
215 ɬÍ×¤Ê \fIut_id\fP ¤ò»ý¤Ä¶õ¤Î¥ì¥³¡¼¥É¤ò¸«¤Ä¤±¤é¤ì¤Ê¤«¤Ã¤¿¾ì¹ç¡¢
217 ¤Ï¿·¤·¤¤¥ì¥³¡¼¥É¤òºî¤ë¡£inittab ¤«¤é \fIut_id\fP ¤òÀßÄꤷ¡¢
218 \fIut_pid\fP ¤ª¤è¤Ó \fIut_time\fP ¤ò¸½ºßÃͤˡ¢
219 \fIut_type\fP ¤ò \fBINIT_PROCESS\fP ¤ËÀßÄꤹ¤ë¡£
221 .\"O .BR mingetty (8)
224 .\"O locates the entry by the PID, changes \fIut_type\fP to
225 .\"O \fBLOGIN_PROCESS\fP, changes \fIut_time\fP, sets \fIut_line\fP, and waits
226 .\"O for connection to be established.
228 .\"O after a user has been
229 .\"O authenticated, changes \fIut_type\fP to \fBUSER_PROCESS\fP, changes
230 .\"O \fIut_time\fP, and sets \fIut_host\fP and \fIut_addr\fP.
232 .\"O .BR mingetty (8)
237 .\"O records may be located by
238 .\"O \fIut_line\fP instead of the preferable \fIut_pid\fP.
242 ¤Ï pid ¤Ç¥¨¥ó¥È¥ê¤òÆÃÄꤷ¡¢
243 \fIut_type\fP ¤ò \fBLOGIN_PROCESS\fP ¤ËÊѹ¹¤·¡¢
244 \fIut_time\fP ¤ò¹¹¿·¤·¡¢\fIut_line\fP¤òÀßÄꤷ¤¿¸å¡¢Àܳ¤¬³ÎΩ¤µ¤ì¤ë¤Î¤òÂԤġ£
246 ¤Ï¥æ¡¼¥¶¡¼Ç§¾Ú¤¬½ªÎ»¤¹¤ë¤È¡¢
247 \fIut_type\fP ¤ò \fBUSER_PROCESS\fP ¤ËÊѹ¹¤·¡¢
248 \fIut_time\fP ¤ò¹¹¿·¤·¡¢\fIut_host\fP ¤È \fIut_addr\fP¤òÀßÄꤹ¤ë¡£
255 \fIut_pid\fP ¤ÎÂå¤ï¤ê¤Ë
256 \fIut_line\fP ¤ò»È¤Ã¤Æ¥ì¥³¡¼¥É¤ÎÆÃÄ꤬¹Ô¤ï¤ì¤ë¤³¤È¤â¤¢¤ë
257 (\fIut_pid\fP ¤ò»È¤¦Êý¤¬Ë¾¤Þ¤·¤¤) ¡£
261 .\"O finds that a process has exited, it locates its utmp
262 .\"O entry by \fIut_pid\fP, sets \fIut_type\fP to \fBDEAD_PROCESS\fP, and
263 .\"O clears \fIut_user\fP, \fIut_host\fP and \fIut_time\fP with null bytes.
265 ¤Ï¥×¥í¥»¥¹¤Î½ªÎ»¤ò¸¡½Ð¤·¤¿¾ì¹ç¡¢
266 \fIut_pid\fP ¤ò¥¡¼¤È¤·¤Æ utmp ¤Î¥¨¥ó¥È¥ê¤òÆÃÄꤷ¡¢
267 \fIut_type\fP ¤ò \fBDEAD_PROCESS\fP ¤ËÀßÄꤷ¡¢
268 \fIut_user\fP, \fIut_host\fP, \fIut_time\fP ¤ò¥Ì¥ë¥Ð¥¤¥È¤Ç¥¯¥ê¥¢¤¹¤ë¡£
271 .\"O and other terminal emulators directly create a
272 .\"O \fBUSER_PROCESS\fP record and generate the \fIut_id\fP by using the
273 .\"O string that suffix part of the terminal name (the characters
274 .\"O following \fI/dev/[pt]ty\fP).
275 .\"O If they find a \fBDEAD_PROCESS\fP for this ID,
276 .\"O they recycle it, otherwise they create a new entry.
277 .\"O If they can, they
278 .\"O will mark it as \fBDEAD_PROCESS\fP on exiting and it is advised that
279 .\"O they null \fIut_line\fP, \fIut_time\fP, \fIut_user\fP, and \fIut_host\fP
282 ¥³¥Þ¥ó¥É¤ä¾¤ÎüËö¥¨¥ß¥å¥ì¡¼¥¿¤Ï
283 ľÀÜ \fBUSER_PROCESS\fP ¤Î¥ì¥³¡¼¥É¤òºî¤ê¡¢
284 üËö̾¤Î¥µ¥Õ¥£¥Ã¥¯¥¹Ê¸»úÎó (\fI/dev/[pt]ty\fP ¤Ë³¤¯Ê¸»úÎó)
285 ¤ò»È¤Ã¤Æ \fIut_id\fP ¤ÎÃͤòÀ¸À®¤¹¤ë¡£
286 ¤³¤Î id ¤ò»ý¤Ä¥¨¥ó¥È¥ê¤¬ \fBDEAD_PROCESS\fP ¤Ç¤¢¤Ã¤¿¾ì¹ç¤Ë¤ÏºÆÍøÍѤ·¡¢
287 ¤½¤ì°Ê³°¤Î¾ì¹ç¤Ë¤Ï¿·¤·¤¤¥¨¥ó¥È¥ê¤¬ºî¤é¤ì¤ë¡£
288 ²Äǽ¤Ê¾ì¹ç¤Ë¤Ï¥×¥í¥»¥¹½ªÎ»»þ¤Ë \fBDEAD_PROCESS\fP ¤ÈÀßÄꤷ¡¢
289 ¤µ¤é¤Ë \fIut_line\fP, \fIut_time\fP, \fIut_user\fP, \fIut_host\fP
290 ¤ò¥Ì¥ë¥Ð¥¤¥È¤Ç¥¯¥ê¥¢¤¹¤ë¤³¤È¤¬¾©Î夵¤ì¤Æ¤¤¤ë¡£
292 .\"O sets up a \fBLOGIN_PROCESS\fP entry and leaves the rest to
295 .\"O After the telnet session ends,
297 .\"O cleans up utmp in the described way.
299 ¤Ï \fBLOGIN_PROCESS\fP ¤òÀßÄꤹ¤ë¤À¤±¤Ç¤è¤¯¡¢
303 telnet ¤Î¥»¥Ã¥·¥ç¥ó¤¬½ªÎ»¤·¤¿¸å¡¢Á°½Ò¤Î¤è¤¦¤Ë
305 ¤¬ utmp ¤Î¥¨¥ó¥È¥ê¤ò½é´ü²½¤¹¤ë¡£
307 .\"O The \fIwtmp\fP file records all logins and logouts.
308 .\"O Its format is exactly like \fIutmp\fP except that a null username
309 .\"O indicates a logout
310 .\"O on the associated terminal.
311 .\"O Furthermore, the terminal name \fB~\fP
312 .\"O with username \fBshutdown\fP or \fBreboot\fP indicates a system
313 .\"O shutdown or reboot and the pair of terminal names \fB|\fP/\fB}\fP
314 .\"O logs the old/new system time when
317 .\"O \fIwtmp\fP is maintained by
320 .\"O and some versions of
323 .\"O .BR mingetty (8)
325 .\"O .BR agetty (8)).
326 .\"O None of these programs creates the file, so if it is
327 .\"O removed, record-keeping is turned off.
328 \fIwtmp\fP ¥Õ¥¡¥¤¥ë¤Ë¤Ï¡¢¤¹¤Ù¤Æ¤Î¥í¥°¥¤¥ó¤È¥í¥°¥¢¥¦¥È¤¬µÏ¿¤µ¤ì¤ë¡£
329 ¤½¤Î¥Õ¥©¡¼¥Þ¥Ã¥È¤Ï¡¢¥í¥°¥¢¥¦¥ÈºÑ¤ÎüËö¤Ç¥æ¡¼¥¶¡¼Ì¾¤¬¥Ì¥ë¤È¤Ê¤ë¤³¤È°Ê³°¤Ï
330 \fIutmp\fP ¤È¤Þ¤Ã¤¿¤¯Æ±¤¸¤Ç¤¢¤ë¡£
331 ¥æ¡¼¥¶¡¼Ì¾¤¬ \fBshutdown\fP ¤â¤·¤¯¤Ï \fBreboot\fP ¤Ç¤¢¤ë
332 üËö̾ \fB~\fP ¤Ï¥·¥¹¥Æ¥à¤ÎÄä»ß (shutdown) ¤Þ¤¿¤ÏºÆµ¯Æ° (reboot)
333 ¤ò°ÕÌ£¤¹¤ë¡£¤Þ¤¿¤½¤ÎüËö̾¤¬ \fB|\fP ¤È \fB}\fP ¤ÎÂФÏ
335 ¥³¥Þ¥ó¥É¤ÇÊѹ¹¤·¤¿¿·¡¿µì¤Î¥·¥¹¥Æ¥à»þ¹ï¤òµÏ¿¤·¤Æ¤¤¤ë¡£
336 \fIwtmp\fP ¥Õ¥¡¥¤¥ë¤Ï
339 ¤ä¤¤¤¯¤Ä¤«¤Î¥Ð¡¼¥¸¥ç¥ó¤Î
344 ¤Ë¤è¤ê´ÉÍý¤µ¤ì¤Æ¤¤¤ë¡£
345 ¤³¤ì¤é¤Î¥×¥í¥°¥é¥à¤Ï¤É¤ì¤â¥Õ¥¡¥¤¥ë¤ò¿·¤¿¤ËºîÀ®¤·¤Ê¤¤¤Î¤Ç¡¢
346 ¥Õ¥¡¥¤¥ë¤òºï½ü¤¹¤ë¤³¤È¤Ç¾ðÊó¤ÎµÏ¿ (record-keeping) ¤ò»ß¤á¤ë¤³¤È¤¬¤Ç¤¤ë¡£
352 .\"O .SH "CONFORMING TO"
355 .\"O POSIX.1 does not specify a
357 .\"O structure, but rather one named
359 .\"O with specifications for the fields
367 .\"O POSIX.1 does not specify the lengths of the
376 ¹½Â¤ÂΤòµ¬Äꤷ¤Æ¤¤¤ë¡£
378 ¹½Â¤ÂΤǵ¬Äꤵ¤ì¤Æ¤¤¤ë¤Î¤Ï¡¢¥Õ¥£¡¼¥ë¥É
386 POSIX.1 ¤Ç¤Ï¡¢¥Õ¥£¡¼¥ë¥É
390 ¤ÎŤµ¤Ïµ¬Äꤵ¤ì¤Æ¤¤¤Ê¤¤¡£
392 .\"O Linux defines the
394 .\"O structure to be the same as the
402 .\"O .SS Comparison with Historical Systems
403 .SS ²áµî¤Î¥·¥¹¥Æ¥à¤È¤ÎÈæ³Ó
404 .\"O Linux utmp entries conform neither to v7/BSD nor to System V; they are a
406 Linux ¤Ç¤Î utmp ¤Î¥¨¥ó¥È¥ê¤Ï v7/BSD ¤ä System V ¤Î¤¤¤º¤ì¤Ë¤â½àµò¤·¤Æ¤ª¤é¤º¡¢
407 ¤½¤ÎξÊý¤¬º®ºß¤·¤¿¤â¤Î¤Ç¤¢¤ë¡£
409 .\"O v7/BSD has fewer fields; most importantly it lacks
410 .\"O \fIut_type\fP, which causes native v7/BSD-like programs to display (for
411 .\"O example) dead or login entries.
412 .\"O Further, there is no configuration file
413 .\"O which allocates slots to sessions.
414 .\"O BSD does so because it lacks \fIut_id\fP fields.
415 v7/BSD ¤Ç¤Ï¤è¤ê¾¯¤·¤Î¹àÌܤ·¤«¤Ê¤¤;
416 ¤â¤Ã¤È¤â½ÅÍפʤ³¤È¤Ï¡¢\fIut_type\fP ¤¬Ìµ¤¤¤³¤È¤Ç¤¢¤ë¡£
417 ¤½¤Î¤¿¤á v7/BSD ·Ï¤Î¥×¥í¥°¥é¥à¤Ç¤Ï (¤¿¤È¤¨¤Ð) »à¤ó¤À¾õÂ֤Υ¨¥ó¥È¥ê¤ä
418 ¥í¥°¥¤¥ó¾õÂ֤Υ¨¥ó¥È¥ê¤Þ¤Çɽ¼¨¤µ¤ì¤Æ¤·¤Þ¤¦¤³¤È¤Ë¤Ê¤Ã¤¿¡£
419 ¤µ¤é¤Ë¥»¥Ã¥·¥ç¥óÍѤΥ¹¥í¥Ã¥È¤ò³ä¤êÅö¤Æ¤ë¤¿¤á¤ÎÀßÄê¥Õ¥¡¥¤¥ë¤¬¤Ê¤¤¡£
420 BSD ¤ËÀßÄê¥Õ¥¡¥¤¥ë¤¬¤¢¤ë¤Î¤Ï \fIut_id\fP ¤¬¤Ê¤¤¤«¤é¤Ç¤¢¤ë¡£
422 .\"O In Linux (as in System V), the \fIut_id\fP field of a
423 .\"O record will never change once it has been set, which reserves that slot
424 .\"O without needing a configuration file.
425 .\"O Clearing \fIut_id\fP may result
426 .\"O in race conditions leading to corrupted utmp entries and potential
428 .\"O Clearing the abovementioned fields by filling them
429 .\"O with null bytes is not required by System V semantics,
430 .\"O but makes it possible to run
431 .\"O many programs which assume BSD semantics and which do not modify utmp.
432 .\"O Linux uses the BSD conventions for line contents, as documented above.
433 Linux (System V ·Ï)¤Ç¤Ï¡¢ÀßÄê¥Õ¥¡¥¤¥ë¤òɬÍפȤ»¤º
434 ¥»¥Ã¥·¥ç¥óÍѤΥ¹¥í¥Ã¥È¤ò³ä¤êÅö¤Æ¤ë¤Î¤Ç¡¢°ìöÀßÄê
435 ¤µ¤ì¤Æ¤·¤Þ¤¦¤È¥ì¥³¡¼¥É¤Î \fIut_id\fP ¤Ï·è¤·¤ÆÊѹ¹¤µ¤ì¤Ê¤¤¡£
436 \fIut_id\fP ¤ò¥¯¥ê¥¢¤¹¤ë¤È¶¥¹ç¾õÂ֤ˤª¤Á¤¤¤ê¡¢
437 utmp ¤Î¥¨¥ó¥È¥ê¤ò²õ¤·¤¿¤ê¡¢ÀøºßŪ¤Ê¥»¥¥å¥ê¥Æ¥£¥Û¡¼¥ë¤Ë¤Ê¤ë²ÄǽÀ¤¬¤¢¤ë¡£
438 ¾å½Ò¤Î¥Õ¥£¡¼¥ë¥É¤ò NULL ¥Ð¥¤¥È¤ÇËä¤á¤Æ¥¯¥ê¥¢¤·¤Æ¤ª¤¯¤Î¤Ï¡¢
439 System V ¤Ç¤Î¼è¤ê·è¤á¤Ç¤ÏɬÍפȤϤµ¤ì¤Æ¤¤¤Ê¤¤¤¬¡¢
440 BSD ¤Ç¤Î¼è¤ê·è¤á¤òÁ°Äó¤È¤·¤Æ¤¤¤Æ¡¢¤«¤Ä utmp ¤ò¹¹¿·¤·¤Ê¤¤Â¿¤¯¤Î¥×¥í¥°¥é¥à¤¬
441 Æ°ºî¤¹¤ë¤è¤¦¤Ë¤¹¤ë¤¿¤á¤Ç¤¢¤ë¡£
442 Linux ¤Ç¤Ï¤³¤³¤Þ¤Çµ½Ò¤·¤Æ¤¤¿¤è¤¦¤Ë¡¢¹ÔÆâÍƤÎɽ¼¨¤Ï BSD ¤Î´·Îã¤Ë½¾¤Ã¤Æ¤¤¤ë¡£
444 .\"O .\" mtk: What is the referrent of "them" in the following sentence?
445 .\"O .\" System V only uses the type field to mark them and logs
446 .\"O .\" informative messages such as \fB"new time"\fP in the line field.
447 .\"O System V has no \fIut_host\fP or \fIut_addr_v6\fP fields.
448 .\" mtk: What is the referrent of "them" in the following sentence?
449 .\" System V ¤Ç¤Ï ut_type ¤òÌÜ°õ¤Ë¤·¤¿¤ê¡¢¤¿¤È¤¨¤Ð \fB"new time"\fP ¤Î¤è¤¦¤Ê
450 .\" ÄÌÃÎ¥á¥Ã¥»¡¼¥¸¤òµÏ¿¤¹¤ë¤¿¤á¤Î¤ß¤Ë»È¤Ã¤Æ¤¤¤ë¡£
451 \fBUT_UNKNOWN\fP ¤Ï Linux ¤Çºî¤é¤ì¤¿¤â¤Î¤Î¤è¤¦¤Ç¤¢¤ë¡£
452 System V ¤Ë¤Ï \fIut_host\fP ¤â \fIut_addr_v6\fP ¤â¸ºß¤·¤Ê¤¤¡£
456 .\"O Unlike various other
457 .\"O systems, where utmp logging can be disabled by removing the file, utmp
458 .\"O must always exist on Linux.
459 .\"O If you want to disable
462 .\"O do not make utmp world readable.
463 ¥Õ¥¡¥¤¥ë¤òºï½ü¤¹¤ë¤³¤È¤Ç utmp ¤Ø¤ÎµÏ¿¤ò»ß¤á¤é¤ì¤ë
464 ¾¤ÎÍÍ¡¹¤Ê¥·¥¹¥Æ¥à¤È¤Ï°ã¤¤¡¢Linux ¤Ç¤Ï utmp ¥Õ¥¡¥¤¥ë¤òɬ¤º¤ª¤¤¤Æ
467 ¥³¥Þ¥ó¥É¤¬µ¡Ç½¤·¤Ê¤¤¤è¤¦¤Ë¤·¤¿¤¤¾ì¹ç¤Ë¤Ï¡¢
468 utmp ¥Õ¥¡¥¤¥ë¤ÎÁ´¥æ¡¼¥¶¡¼¤ËÂФ¹¤ëÆɤ߼è¤êµö²Ä¤òÀßÄꤷ¤Ê¤¤¤è¤¦¤Ë¤¹¤ë¡£
470 .\"O The file format is machine-dependent, so it is recommended that it be
471 .\"O processed only on the machine architecture where it was created.
472 ¥Õ¥¡¥¤¥ë¤Î¥Õ¥©¡¼¥Þ¥Ã¥È¤Ï¥Þ¥·¥ó¤Ë°Í¸¤¹¤ë¤Î¤Ç¡¢¥Õ¥¡¥¤¥ë¤¬ºî¤é¤ì¤¿
473 ¥Þ¥·¥ó¤â¤·¤¯¤ÏƱ°ì¥¢¡¼¥¥Æ¥¯¥Á¥ã¤Î¥Þ¥·¥ó¾å¤Ç¤Î¤ß½èÍý¤¹¤ë¤³¤È¤ò¿ä¾©¤¹¤ë¡£
475 .\"O Note that on \fIbiarch\fP platforms, that is, systems which can run both
476 .\"O 32-bit and 64-bit applications (x86-64, ppc64, s390x, etc.),
477 .\"O \fIut_tv\fP is the same size in 32-bit mode as in 64-bit mode.
478 .\"O The same goes for \fIut_session\fP and \fIut_time\fP if they are present.
479 .\"O This allows data files and shared memory to be shared between
480 .\"O 32-bit and 64-bit applications.
481 Ãí°Õ¤¹¤Ù¤ÅÀ¤È¤·¤Æ¤Ï¡¢
482 \fIbiarch\fP ¤Ê¥×¥é¥Ã¥È¥Õ¥©¡¼¥à¡¢¤Ä¤Þ¤ê 32¥Ó¥Ã¥È¤È 64¥Ó¥Ã¥È¤ÎξÊý¤Î
483 ¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤ò¼Â¹Ô¤Ç¤¤ë¥·¥¹¥Æ¥à (x86-64, ppc64, s390x ¤Ê¤É) ¤Ç¤Ï¡¢
484 \fIut_tv\fP ¤Î¥µ¥¤¥º¤Ï 32¥Ó¥Ã¥È¥â¡¼¥É¤È 64¥Ó¥Ã¥È¥â¡¼¥É¤ÇƱ¤¸¤Ç¤¢¤ë¡£
485 \fIut_session\fP ¤È \fIut_time\fP ¤â¡¢Â¸ºß¤¹¤ë¾ì¹ç¤Ë¤ÏƱÍͤËƱ¤¸¥µ¥¤¥º
486 ¤Ç¤¢¤ë¡£¤³¤ì¤Ë¤è¤ê¡¢32¥Ó¥Ã¥È¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤È 64¥Ó¥Ã¥È¥¢¥×¥ê¥±¡¼¥·¥ç¥ó
487 ¤Î´Ö¤Ç¥Ç¡¼¥¿¥Õ¥¡¥¤¥ë¤È¶¦Í¥á¥â¥ê¤ò¶¦Í¤¹¤ë¤³¤È¤¬²Äǽ¤Ë¤Ê¤ë¡£
488 .\"O This is achieved by changing the type of
494 .\"O to a struct with two
511 ¤ò»ý¤Ä¹½Â¤ÂΤËÊѹ¹¤¹¤ì¤Ð¤è¤¤
512 .\"O Since \fIut_tv\fP may not be the same as \fIstruct timeval\fP,
513 .\"O then instead of the call:
514 \fIut_tv\fP ¤Ï \fIstruct timeval\fP ¤ÈƱ¤¸¥µ¥¤¥º¤È¤Ï¸Â¤é¤Ê¤¤¤Î¤Ç¡¢
518 gettimeofday((struct timeval *) &ut.ut_tv, NULL);
522 ¤Î¤è¤¦¤Ê¸Æ¤Ó½Ð¤·¤ò¤¹¤ë¤Î¤Ç¤Ï¤Ê¤¯¡¢
523 .\"O the following method of setting this field is recommended:
524 °Ê²¼¤Î¤è¤¦¤Ë³Æ¥Õ¥£¡¼¥ë¥É¤òÀßÄꤹ¤ëÊýË¡¤¬¿ä¾©¤µ¤ì¤ë:
531 gettimeofday(&tv, NULL);
532 ut.ut_tv.tv_sec = tv.tv_sec;
533 ut.ut_tv.tv_usec = tv.tv_usec;
537 .\"O Note that the \fIutmp\fP struct from libc5 has changed in libc6.
538 .\"O Because of this,
539 .\"O binaries using the old libc5 struct will corrupt
540 .\"O .IR /var/run/utmp " and/or " /var/log/wtmp .
541 utmp ¹½Â¤ÂÎ¤Ï libc5 ¤«¤é libc6 ¤ÇÊѹ¹¤µ¤ì¤¿¡£¤½¤Î¤¿¤áÀΤΠlibc5 ¤Î¹½Â¤ÂÎ
543 .IR /var/run/utmp " ¤ä " /var/log/wtmp
544 ¥Õ¥¡¥¤¥ë¤ò²õ¤·¤Æ¤·¤Þ¤¦¡£
547 .\"O This man page is based on the libc5 one, things may work differently now.
548 ¤³¤Î man ¥Ú¡¼¥¸¤Ï libc5 ¤Ë´ð¤Å¤¤¤Æºî¤é¤ì¤Æ¤¤¤Æ¡¢
549 ºÇ¿·¤Î¤â¤Î¤Ç¤Ï°ã¤Ã¤Æ¤¤¤ë¤«¤â¤·¤ì¤Ê¤¤¡£