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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);

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 utmp file.

FILES
       /var/log/wtmp
              database of past user logins

CONFORMING TO
       Not in POSIX.1-2001.  Present on Solaris, NetBSD, and perhaps other systems.

AVAILABILITY
       Both functions are available under glibc2, but not under libc5.  However, logwtmp() used to occur  in  the  old
       libbsd.   These  days, the logwtmp() function is included in libutil.  (Hence you'll need to add -lutil to your
       compiler command line to get it.)

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 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                               2008-07-02                        UPDWTMP(3)