pam_error 3 Linux-PAM Manual pam_error pam_verror display error messages to the user #include <security/pam_ext.h> int pam_error pam_handle_t *pamh const char *fmt ... int pam_verror pam_handle_t *pamh const char *fmt va_list args The pam_error function prints error messages through the conversation function to the user. The pam_verror function performs the same task as pam_error() with the difference that it takes a set of arguments which have been obtained using the stdarg3 variable argument list macros. PAM_BUF_ERR Memory buffer error. PAM_CONV_ERR Conversation failure. PAM_SUCCESS Error message was displayed. PAM_SYSTEM_ERR System error. pam_info3 , pam_vinfo3 , pam_prompt3 , pam_vprompt3 , pam8 The pam_error and pam_verror functions are Linux-PAM extensions.