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LOGIN(3) Library Functions Manual LOGIN(3)

login, logout, logwtmp
login utility functions

#include <utmp.h>
#include <util.h>
void
login(struct utmp *ut);
int
logout(const char *line);
void
logwtmp(const char *line, const char *name, const char *host);

The login(), logout(), and logwtmp() functions operate on the database of current users in /var/run/utmp and on the logfile /var/log/wtmp of logins and logouts.
The login() function updates the /var/run/utmp and /var/log/wtmp files with user information contained in ut.
The logout() function removes the entry from /var/run/utmp corresponding to the device line.
The logwtmp() function adds an entry to /var/log/wtmp. Since login() will add the appropriate entry for /var/log/wtmp during a login, logwtmp() is usually used for logouts.

logout() returns non-zero if it was able to find and delete an entry for line, and zero if there is no entry for line in /var/run/utmp.

/dev/∗
 
/etc/ttys
 
/var/run/utmp
 
/var/log/wtmp
 

utmp(5)
June 5, 2013 OpenBSD-current