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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 3.27 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/.