60 lines
1.8 KiB
Groff
60 lines
1.8 KiB
Groff
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UTMP(5) Minix Programmer's Manual UTMP(5)
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NAME
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utmp, wtmp - logged in users, login and logout history
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SYNOPSIS
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#include <sys/types.h>
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#include <utmp.h>
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DESCRIPTION
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The files /etc/utmp and /usr/adm/wtmp respectively contain the currently
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logged in users, and the history of logins and logouts.
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Each file is an array of the following structure defined in <utmp.h>:
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struct utmp {
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char ut_user[8]; /* user name */
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char ut_line[12]; /* terminal name */
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char ut_host[16]; /* host name, when remote */
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time_t ut_time; /* login/logout time */
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};
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#define ut_name ut_user /* for compatibility with other systems */
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The structure contains more fields than those listed, but they are only
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of interest to init and login. Note that the ut_name field is a
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compatibility alias for ut_user, it is actually better to use it.
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A login entry is completely specified. A logout entry has a null string
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for ut_name. A shutdown or reboot entry has an ut_line field containing
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a "~" (tilde). The ut_name field is usually the name of the program that
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did the shutdown, or "reboot" at reboot. This is a bit confusing, but
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note that there should always be two such entries. If you see just one
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entry then the system has crashed, if you see two entries then the system
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was properly shut down and later rebooted.
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FILES
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/etc/utmp Currently logged in users.
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/usr/adm/wtmp History of logins and logouts.
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SEE ALSO
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who(1), ttyslot(3).
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AUTHOR
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Kees J. Bot (kjb@cs.vu.nl)
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1
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