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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);

   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/.



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