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 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 3.25 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/.



GNU                                                        2008-07-02                                                 UPDWTMP(3)