• 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 3.19 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/.
  

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