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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);

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.

AVAILABILITY
       Both  functions	are available under glibc2, but not under libc5.  How‐
       ever, 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.)

CONFORMING TO
       Not in POSIX.1-2001.  Present on Solaris,  NetBSD,  and	perhaps	 other
       systems.

FILES
       /var/log/wtmp
	      database of past user logins

SEE ALSO
       wtmp(5)

GNU				  2003-07-18			    UPDWTMP(3)

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