logwtmp(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 4.09 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/.

---

Free and Open Source Software