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 wtmp 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 3.27 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/.

GNU
								    2008-07-02								UPDWTMP(3)