logwtmp(3) -- Linux man page

 

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 an 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. 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 commandline to get it.)  

FILES

/var/log/wtmp
database of past user logins
 

SEE ALSO

wtmp(5)