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1 | .\" Copyright (c) 1993 Michael Haardt (michael@cantor.informatik.rwth-aachen.de), |
| 2 | .\" Fri Apr 2 11:32:09 MET DST 1993 | |
| fea681da | 3 | .\" |
| 1dd72f9c | 4 | .\" %%%LICENSE_START(GPLv2+_DOC_FULL) |
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5 | .\" This is free documentation; you can redistribute it and/or |
| 6 | .\" modify it under the terms of the GNU General Public License as | |
| 7 | .\" published by the Free Software Foundation; either version 2 of | |
| 8 | .\" the License, or (at your option) any later version. | |
| 9 | .\" | |
| 10 | .\" The GNU General Public License's references to "object code" | |
| 11 | .\" and "executables" are to be interpreted as the output of any | |
| 12 | .\" document formatting or typesetting system, including | |
| 13 | .\" intermediate and printed output. | |
| 14 | .\" | |
| 15 | .\" This manual is distributed in the hope that it will be useful, | |
| 16 | .\" but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 17 | .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 18 | .\" GNU General Public License for more details. | |
| 19 | .\" | |
| 20 | .\" You should have received a copy of the GNU General Public | |
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21 | .\" License along with this manual; if not, see |
| 22 | .\" <http://www.gnu.org/licenses/>. | |
| 6a8d8745 | 23 | .\" %%%LICENSE_END |
| c13182ef | 24 | .\" |
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25 | .\" Modified 1993-07-25 by Rik Faith (faith@cs.unc.edu) |
| 26 | .\" Modified 1995-02-26 by Michael Haardt | |
| 27 | .\" Modified 1996-07-20 by Michael Haardt | |
| e00c3a07 | 28 | .\" Modified 1997-07-02 by Nicolás Lichtmaier <nick@debian.org> |
| fea681da | 29 | .\" Modified 2004-10-31 by aeb, following Gwenole Beauchesne |
| 4b8c67d9 | 30 | .TH UTMP 5 2017-09-15 "Linux" "Linux Programmer's Manual" |
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31 | .SH NAME |
| 32 | utmp, wtmp \- login records | |
| 33 | .SH SYNOPSIS | |
| 62218dc0 | 34 | .B #include <utmp.h> |
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35 | .SH DESCRIPTION |
| 36 | The | |
| 37 | .I utmp | |
| 38 | file allows one to discover information about who is currently using the | |
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39 | system. |
| 40 | There may be more users currently using the system, because not | |
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41 | all programs use utmp logging. |
| 42 | .PP | |
| 43 | .B Warning: | |
| 44 | .I utmp | |
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45 | must not be writable by the user class "other", |
| 46 | because many system programs (foolishly) | |
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47 | depend on its integrity. |
| 48 | You risk faked system logfiles and | |
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49 | modifications of system files if you leave |
| 50 | .I utmp | |
| 01f59bf3 | 51 | writable to any user other than the owner and group owner of the file. |
| fea681da | 52 | .PP |
| c5571b61 | 53 | The file is a sequence of |
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54 | .I utmp |
| 55 | structures, | |
| 56 | declared as follows in | |
| 57 | .IR <utmp.h> | |
| 58 | (note that this is only one of several definitions | |
| fea681da | 59 | around; details depend on the version of libc): |
| 78bffc45 | 60 | .PP |
| 088a639b | 61 | .in +4n |
| bdd915e2 | 62 | .EX |
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63 | /* Values for ut_type field, below */ |
| 64 | ||
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65 | #define EMPTY 0 /* Record does not contain valid info |
| 66 | (formerly known as UT_UNKNOWN on Linux) */ | |
| 67 | #define RUN_LVL 1 /* Change in system run-level (see | |