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.\" $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.h>

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