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);

       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 4.10 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/.



GNU				  2015-04-19			    UPDWTMP(3)