PAM_AUSER
pam_set_item(pamh, PAM_AUSER, pwd.pw_name) != PAM_SUCCESS)
case PAM_AUSER:
(void) pam_get_item(pamh, PAM_AUSER, (const void **)&auser);
(void) pam_get_item(pamh, PAM_AUSER, (const void **)&auser);
(void) pam_get_item(pamh, PAM_AUSER, (const void **)&auser);