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check for password expiration

#include <stdio.h>
#include <util.h>
login_check_expire(FILE *back, struct passwd *pwd, char *class, int lastchance);

The login_check_expire() function is called by a BSD Authentication login script to check whether the user's password entry, as described by pwd, has expired.
If a class is specified, it is used instead of the class specified in the user's password database entry. If the lastchance argument is non-zero, the user's password has expired, and it has not been expired longer than “password-dead” seconds (see login.conf(5)), the user will be able to log in one last time to change the password.

The login_check_expire() function returns 0 if the user's password has not expired, and 1 if it has expired or if an error occurred.
Status and error messages are passed back to the login script caller via the back channel, back.

auth_subr(3), authenticate(3), login.conf(5)
December 4, 2014 OpenBSD-current