.\" Copyright (c) 1997, 2001 - 2006 Kungliga Tekniska Högskolan .\" (Royal Institute of Technology, Stockholm, Sweden). .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" 3. Neither the name of the Institute nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" $Id: krb5_warn.3 19085 2006-11-21 07:55:20Z lha $ .\" .Dd May 1, 2006 .Dt KRB5_WARN 3 .Os HEIMDAL .Sh NAME .Nm krb5_abort , .Nm krb5_abortx , .Nm krb5_clear_error_string , .Nm krb5_err , .Nm krb5_errx , .Nm krb5_free_error_string , .Nm krb5_get_err_text , .Nm krb5_get_error_message , .Nm krb5_get_error_string , .Nm krb5_have_error_string , .Nm krb5_set_error_string , .Nm krb5_set_warn_dest , .Nm krb5_get_warn_dest , .Nm krb5_vabort , .Nm krb5_vabortx , .Nm krb5_verr , .Nm krb5_verrx , .Nm krb5_vset_error_string , .Nm krb5_vwarn , .Nm krb5_vwarnx , .Nm krb5_warn , .Nm krb5_warnx .Nd Heimdal warning and error functions .Sh LIBRARY Kerberos 5 Library (libkrb5, -lkrb5) .Sh SYNOPSIS .In krb5.h .Ft krb5_error_code .Fn krb5_abort "krb5_context context" "krb5_error_code code" "const char *fmt" "..." .Ft krb5_error_code .Fn krb5_abortx "krb5_context context" "krb5_error_code code" "const char *fmt" "..." .Ft void .Fn krb5_clear_error_string "krb5_context context" .Ft krb5_error_code .Fn krb5_err "krb5_context context" "int eval" "krb5_error_code code" "const char *format" "..." .Ft krb5_error_code .Fn krb5_errx "krb5_context context" "int eval" "const char *format" "..." .Ft void .Fn krb5_free_error_string "krb5_context context" "char *str" .Ft krb5_error_code .Fn krb5_verr "krb5_context context" "int eval" "krb5_error_code code" "const char *format" "va_list ap" .Ft krb5_error_code .Fn krb5_verrx "krb5_context context" "int eval" "const char *format" "va_list ap" .Ft krb5_error_code .Fn krb5_vset_error_string "krb5_context context" "const char *fmt" "va_list args" .Ft krb5_error_code .Fn krb5_vwarn "krb5_context context" "krb5_error_code code" "const char *format" "va_list ap" .Ft krb5_error_code .Fn krb5_vwarnx "krb5_context context" "const char *format" "va_list ap" .Ft krb5_error_code .Fn krb5_warn "krb5_context context" "krb5_error_code code" "const char *format" "..." .Ft krb5_error_code .Fn krb5_warnx "krb5_context context" "const char *format" "..." .Ft krb5_error_code .Fn krb5_set_error_string "krb5_context context" "const char *fmt" "..." .Ft krb5_error_code .Fn krb5_set_warn_dest "krb5_context context" "krb5_log_facility *facility" .Ft "char *" .Ft krb5_log_facility * .Fo krb5_get_warn_dest .Fa "krb5_context context" .Fc .Fn krb5_get_err_text "krb5_context context" "krb5_error_code code" .Ft char* .Fn krb5_get_error_string "krb5_context context" .Ft char* .Fn krb5_get_error_message "krb5_context context, krb5_error_code code" .Ft krb5_boolean .Fn krb5_have_error_string "krb5_context context" .Ft krb5_error_code .Fn krb5_vabortx "krb5_context context" "const char *fmt" "va_list ap" .Ft krb5_error_code .Fn krb5_vabort "krb5_context context" "const char *fmt" "va_list ap" .Sh DESCRIPTION These functions print a warning message to some destination. .Fa format is a printf style format specifying the message to print. The forms not ending in an .Dq x print the error string associated with .Fa code along with the message. The .Dq err functions exit with exit status .Fa eval after printing the message. .Pp Applications that want to get the error message to report it to a user or store it in a log want to use .Fn krb5_get_error_message . .Pp The .Fn krb5_set_warn_func function sets the destination for warning messages to the specified .Fa facility . Messages logged with the .Dq warn functions have a log level of 1, while the .Dq err functions log with level 0. .Pp .Fn krb5_get_err_text fetches the human readable strings describing the error-code. .Pp .Fn krb5_abort and .Nm krb5_abortx behaves like .Nm krb5_err and .Nm krb5_errx but instead of exiting using the .Xr exit 3 call, .Xr abort 3 is used. .Pp .Fn krb5_free_error_string frees the error string .Fa str returned by .Fn krb5_get_error_string . .Pp .Fn krb5_clear_error_string clears the error string from the .Fa context . .Pp .Fn krb5_set_error_string and .Fn krb5_vset_error_string sets an verbose error string in .Fa context . .Pp .Fn krb5_get_error_string fetches the error string from .Fa context . The error message in the context is consumed and must be freed using .Fn krb5_free_error_string by the caller. See also .Fn krb5_get_error_message , what is usually less verbose to use. .Pp .Fn krb5_have_error_string returns .Dv TRUE if there is a verbose error message in the .Fa context . .Pp .Fn krb5_get_error_message fetches the error string from the context, or if there is no customized error string in .Fa context , uses .Fa code to return a error string. In either case, the error message in the context is consumed and must be freed using .Fn krb5_free_error_string by the caller. .Pp .Fn krb5_set_warn_dest and .Fn krb5_get_warn_dest sets and get the log context that is used by .Fn krb5_warn and friends. By using this the application can control where the output should go. For example, this is imperative to inetd servers where logging status and error message will end up on the output stream to the client. .Sh EXAMPLES Below is a simple example how to report error messages from the Kerberos library in an application. .Bd -literal #include krb5_error_code function (krb5_context context) { krb5_error_code ret; ret = krb5_function (context, arg1, arg2); if (ret) { char *s = krb5_get_error_message(context, ret); if (s == NULL) errx(1, "kerberos error: %d (and out of memory)", ret); application_logger("krb5_function failed: %s", s); krb5_free_error_string(context, s); return ret; } return 0; } .Ed .Sh SEE ALSO .Xr krb5 3 , .Xr krb5_openlog 3