(split) LDP_man-pages: release ioctl.2 [JM:00378]

[linuxjm/LDP_man-pages.git] / draft / man3 / login.3

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.\" 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.
.\"
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.\" 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., 675 Mass Ave, Cambridge, MA 02139,
.\" USA.
.\"
.\" Derived from text written by Martin Schulze (or taken from glibc.info)
.\" and text written by Paul Thompson - both copyright 2002.
.\"
.\" Japanese Version Copyright (c) 2004-2005 Yuichi SATO
.\"         all rights reserved.
.\" Translated Thu Aug 26 06:04:53 JST 2004
.\"         by Yuichi SATO <ysato444@yahoo.co.jp>
.\" Updated & Modified Sat Jan 15 06:38:41 JST 2005 by Yuichi SATO
.\"
.TH LOGIN 3 2004-05-06 "GNU" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O login, logout \- write utmp and wtmp entries
login, logout \- utmp ¤È wtmp ¥¨¥ó¥È¥ê¤ò½ñ¤­¹þ¤à
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.B #include <utmp.h>
.sp
.BI "void login(const struct utmp *" ut );
.sp
.BI "int logout(const char *" ut_line );
.sp
.\"O Link with \fI\-lutil\fP.
\fI\-lutil\fP ¤Ç¥ê¥ó¥¯¤¹¤ë¡£
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O The utmp file records who is currently using the system.
utmp ¥Õ¥¡¥¤¥ë¤Ï¸½ºß¥·¥¹¥Æ¥à¤ò»ÈÍѤ·¤Æ¤¤¤ë¥æ¡¼¥¶¤òµ­Ï¿¤¹¤ë¡£
.\"O The wtmp file records all logins and logouts.
.\"O See
.\"O .BR utmp (5).
wtmp ¥Õ¥¡¥¤¥ë¤Ï¤¹¤Ù¤Æ¤Î¥í¥°¥¤¥ó¤È¥í¥°¥¢¥¦¥È¤òµ­Ï¿¤¹¤ë¡£
.BR utmp (5)
¤ò»²¾È¤¹¤ë¤³¤È¡£
.LP
.\"O The function
.\"O .BR login ()
.\"O takes the supplied \fIstruct utmp\fP
.\"O .IR ut ,
.\"O and writes it to both the utmp and the wtmp file.
´Ø¿ô
.BR login ()
¤ÏÍ¿¤¨¤é¤ì¤¿ \fIstruct utmp\fP
.I ut
¤ò utmp ¤È wtmp ¥Õ¥¡¥¤¥ë¤ÎξÊý¤Ë½ñ¤­¹þ¤à¡£
.LP
.\"O The function
.\"O .BR logout ()
.\"O clears the entry in the utmp file again.
´Ø¿ô
.BR logout ()
¤Ï utmp ¥Õ¥¡¥¤¥ë¤Ë¤¢¤ë¥¨¥ó¥È¥ê¤ò¥¯¥ê¥¢¤¹¤ë¡£
.\"O .SS "GNU Details"
.SS "GNU ÈǤξܺÙ"
.\"O More precisely,
.\"O .BR login ()
.\"O takes the argument
.\"O .I ut
.\"O struct, fills the field
.\"O .I ut\->ut_type
.\"O (if there is such a field) with the value
.\"O .BR USER_PROCESS ,
.\"O and fills the field
.\"O .I ut\->ut_pid
.\"O (if there is such a field) with the process ID of the calling process.
¤è¤êÀµ³Î¤Ë¤Ï¡¢
.BR login ()
¤Ï°ú¤­¿ô
.I ut
¹½Â¤ÂΤò¤È¤ê¡¢(¤â¤·Â¸ºß¤¹¤ë¤Ê¤é¤Ð) ¥Õ¥£¡¼¥ë¥É
.I ut\->ut_type
¤ò
.B USER_PROCESS
¤È¤¤¤¦Ãͤˤ·¡¢(¤â¤·Â¸ºß¤¹¤ë¤Ê¤é¤Ð) ¥Õ¥£¡¼¥ë¥É
.I ut\->ut_pid
¤ò¸Æ¤Ó½Ð¤·¸µ¥×¥í¥»¥¹¤Î¥×¥í¥»¥¹ ID ¤ÎÃͤˤ¹¤ë¡£
.\"O Then it tries to fill the field
.\"O .IR ut\->ut_line .
¼¡¤Ë¥Õ¥£¡¼¥ë¥É
.I ut\->ut_line
¤ÎÃͤòÀßÄꤷ¤è¤¦¤È¤¹¤ë¡£
.\"O It takes the first of \fIstdin\fP, \fIstdout\fP, \fIstderr\fP
.\"O that is a tty, and
.\"O stores the corresponding pathname minus a possible leading \fI/dev/\fP
.\"O into this field, and then writes the struct to the utmp file.
¤³¤Î´Ø¿ô¤Ï¡¢É¸½àÆþÎÏ¡¦É¸½à½ÐÎÏ¡¦É¸½à¥¨¥é¡¼½ÐÎϤÎÃ椫¤é
üËö (tty) ¤Ç¤¢¤ëºÇ½é¤Î¤â¤Î¤ò¤È¤ê¡¢
Âбþ¤¹¤ë¥Ñ¥¹Ì¾¤«¤éÀèƬ¤Î \fI/dev/\fP ¤ò°ú¤¤¤¿¤â¤Î¤ò
¤³¤Î¥Õ¥£¡¼¥ë¥É¤Ë³ÊǼ¤·¤Æ¡¢¤³¤Î¹½Â¤ÂΤò utmp ¥Õ¥¡¥¤¥ë¤Ë½ñ¤­¹þ¤à¡£
.\"O On the other hand, if no tty name was found, this field is filled with "???"
.\"O and the struct is not written to the utmp file.
.\"O After this, the struct is written to the wtmp file.
°ìÊý¡¢Ã¼Ëö̾¤¬¸«¤Ä¤«¤é¤Ê¤¤¾ì¹ç¤Ï¡¢¤³¤Î¥Õ¥£¡¼¥ë¥É¤Ï "???" ¤È¤µ¤ì¤Æ¡¢
¤³¤Î¹½Â¤ÂÎ¤Ï utmp ¥Õ¥¡¥¤¥ë¤Ë½ñ¤­¹þ¤Þ¤ì¤Ê¤¤¡£
¤½¤Î¸å¤Ë¤³¤Î¹½Â¤ÂÎ¤Ï wtmp ¥Õ¥¡¥¤¥ë¤Ë½ñ¤­¹þ¤Þ¤ì¤ë¡£
.LP
.\"O The
.\"O .BR logout ()
.\"O function searches the utmp file for an entry matching the
.\"O .I ut_line
.\"O argument.
.\"O If a record is found, it is updated by zeroing out the
.\"O .I ut_name
.\"O and
.\"O .I ut_host
.\"O fields, updating the
.\"O .I ut_tv
.\"O timestamp field and setting
.\"O .I ut_type
.\"O (if there is such a field) to
.\"O .BR DEAD_PROCESS .
.BR logout ()
´Ø¿ô¤Ï utmp ¥Õ¥¡¥¤¥ë¤«¤é
.I ut_line
°ú¤­¿ô¤Ë¥Þ¥Ã¥Á¤¹¤ë¥¨¥ó¥È¥ê¤òõ¤¹¡£
¥ì¥³¡¼¥É¤¬¸«¤Ä¤«¤Ã¤¿¾ì¹ç¡¢
.I ut_name
¤È
.I ut_host
¥Õ¥£¡¼¥ë¥É¤ò¥¯¥ê¥¢¤·¤Æ¡¢
.I ut_tv
¥¿¥¤¥à¥¹¥¿¥ó¥×¥Õ¥£¡¼¥ë¥É¤ò¹¹¿·¤·¡¢
(¤â¤·Â¸ºß¤¹¤ë¤Ê¤é¤Ð)
.I ut_type
¥Õ¥£¡¼¥ë¥É¤ò
.B DEAD_PROCESS
¤Ë¹¹¿·¤¹¤ë¡£
.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O The
.\"O .BR logout ()
.\"O function returns 1 if the entry was successfully written to the
.\"O database, or 0 if an error occurred.
¥¨¥ó¥È¥ê¤ò¥Ç¡¼¥¿¥Ù¡¼¥¹¤Ë½ñ¤­¹þ¤à¤Î¤ËÀ®¸ù¤·¤¿¾ì¹ç¡¢
.BR logout ()
´Ø¿ô¤Ï 1 ¤òÊÖ¤¹¡£
¤Þ¤¿¥¨¥é¡¼¤¬µ¯¤³¤Ã¤¿¾ì¹ç¡¢0 ¤òÊÖ¤¹¡£
.\"O .SH FILES
.SH ¥Õ¥¡¥¤¥ë
.TP
.I /var/run/utmp
.\"O user accounting database, configured through
.\"O .B _PATH_UTMP
.\"O in
.\"O .I <paths.h>
¥æ¡¼¥¶¥¢¥«¥¦¥ó¥È¥Ç¡¼¥¿¥Ù¡¼¥¹¡£
.I <paths.h>
¤Ë¤ª¤±¤ë
.B _PATH_UTMP
¤ÇÀßÄꤵ¤ì¤Æ¤¤¤ë¡£
.TP
.I /var/log/wtmp
.\"O user accounting log file, configured through
.\"O .B _PATH_WTMP
.\"O in
.\"O .I <paths.h>
¥æ¡¼¥¶¥¢¥«¥¦¥ó¥È¥í¥°¥Õ¥¡¥¤¥ë¡£
.I <paths.h>
¤Ë¤ª¤±¤ë
.B _PATH_WTMP
¤ÇÀßÄꤵ¤ì¤Æ¤¤¤ë¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
.\"O Not in POSIX.1-2001.
.\"O Present on the BSDs.
POSIX.1-2001 ¤Ë¤Ï¤Ê¤¤¡£
BSD ·Ï¤Ë¸ºß¤¹¤ë¡£
.\"O .SH NOTES
.SH Ãí°Õ
.\"O Note that the
.\"O member
.\"O .I ut_user
.\"O of
.\"O .I struct utmp
.\"O is called
.\"O .I ut_name
.\"O in BSD.
.\"O Therefore,
.\"O .I ut_name
.\"O is defined as an alias for
.\"O .I ut_user
.\"O in
.\"O .IR <utmp.h> .
.I struct utmp
¤Î¥á¥ó¥Ð
.I ut_user
¤Ï¡¢BSD ¤Ç¤Ï
.I ut_name
¤È¤¤¤¦Ì¾Á°¤Ç¤¢¤ëÅÀ¤ËÃí°Õ¤¹¤ë¤³¤È¡£
¤½¤Î¤¿¤á
.I ut_name
¤Ï
.I <utmp.h>
¤Ë¤ª¤¤¤Æ
.I ut_user
¤Î¥¨¥¤¥ê¥¢¥¹¤È¤·¤ÆÄêµÁ¤µ¤ì¤Æ¤¤¤ë¡£
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR getutent (3),
.BR utmp (5)