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UPDWTMP(3)                 Linux Programmer's Manual                UPDWTMP(3)
NAME
       updwtmp, logwtmp - append an entry to the wtmp file
SYNOPSIS
       #include <utmp.h>
       void updwtmp(const char *wtmp_file, const struct utmp *ut);
       void logwtmp(const char *line, const char *name, const char *host);
       For logwtmp(), link with -lutil.
DESCRIPTION
       updwtmp() appends the utmp structure ut to the wtmp file.
       logwtmp()  constructs  a utmp structure using line, name, host, current
       time and current process ID.  Then it calls  updwtmp()  to  append  the
       structure to the wtmp file.
FILES
       /var/log/wtmp
              database of past user logins
ATTRIBUTES
       For   an   explanation   of   the  terms  used  in  this  section,  see
       attributes(7).
       +-----------+---------------+--------------------------+
       |Interface  | Attribute     | Value                    |
       +-----------+---------------+--------------------------+
       |updwtmp(), | Thread safety | MT-Unsafe sig:ALRM timer |
       |logwtmp()  |               |                          |
       +-----------+---------------+--------------------------+
CONFORMING TO
       Not in POSIX.1.  Present on Solaris, NetBSD, and perhaps other systems.
NOTES
       For consistency with the other "utmpx"  functions  (see  getutxent(3)),
       glibc provides (since version 2.1):
           #include <utmpx.h>
           void updwtmpx (const char *wtmpx_file, const struct utmpx *utx);
       This  function performs the same task as updwtmp(), but differs in that
       it takes a utmpx structure as its last argument.
SEE ALSO
       getutxent(3), wtmp(5)
COLOPHON
       This page is part of release 4.15 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       https://www.kernel.org/doc/man-pages/.
GNU                               2017-09-15                        UPDWTMP(3)