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 wtmp 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 3.54 of the Linux man-pages project.  A description of the project, and
       information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.