mirror of https://github.com/mkerrisk/man-pages
102 lines
2.6 KiB
Groff
102 lines
2.6 KiB
Groff
.\" Copyright 1997 Nicolás Lichtmaier <nick@debian.org>
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.\" Created Wed Jul 2 23:27:34 ART 1997
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.\"
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.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" The GNU General Public License's references to "object code"
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.\" and "executables" are to be interpreted as the output of any
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.\" document formatting or typesetting system, including
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.\" intermediate and printed output.
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.\"
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.\" This manual is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public
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.\" License along with this manual; if not, see
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.\" <http://www.gnu.org/licenses/>.
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.\" %%%LICENSE_END
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.\"
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.\" Added info on availability, aeb, 971207
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.\" Added -lutil remark, 030718
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.\" 2008-07-02, mtk, document updwtmpx()
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.\"
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.TH UPDWTMP 3 2017-09-15 "GNU" "Linux Programmer's Manual"
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.SH NAME
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updwtmp, logwtmp \- append an entry to the wtmp file
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.SH SYNOPSIS
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.nf
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.B #include <utmp.h>
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.PP
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.BI "void updwtmp(const char *" wtmp_file ", const struct utmp *" ut );
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.BI "void logwtmp(const char *" line ", const char *" name \
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", const char *" host );
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.fi
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.PP
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For
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.BR logwtmp (),
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link with \fI\-lutil\fP.
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.SH DESCRIPTION
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.BR updwtmp ()
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appends the utmp structure
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.I ut
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to the wtmp file.
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.PP
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.BR logwtmp ()
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constructs a utmp structure using
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.IR line ", " name ", " host ,
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current time and current process ID.
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Then it calls
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.BR updwtmp ()
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to append the structure to the wtmp file.
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.SH FILES
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.TP
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.I /var/log/wtmp
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database of past user logins
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.ad l
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.nh
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.TS
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allbox;
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lbx lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR updwtmp (),
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.BR logwtmp ()
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T} Thread safety MT-Unsafe sig:ALRM timer
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.TE
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.hy
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.ad
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.sp 1
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.SH CONFORMING TO
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Not in POSIX.1.
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Present on Solaris, NetBSD, and perhaps other systems.
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.SH NOTES
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For consistency with the other "utmpx" functions (see
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.BR getutxent (3)),
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glibc provides (since version 2.1):
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.PP
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.in +4n
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.EX
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.B #include <utmpx.h>
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.BI "void updwtmpx (const char *" wtmpx_file ", const struct utmpx *" utx );
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.EE
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.in
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.PP
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This function performs the same task as
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.BR updwtmp (),
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but differs in that it takes a
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.I utmpx
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structure as its last argument.
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.SH SEE ALSO
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.BR getutxent (3),
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.BR wtmp (5)
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