1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-errors.c Error reporting
4 * Copyright (C) 2002, 2004 Red Hat Inc.
5 * Copyright (C) 2003 CodeFactory AB
7 * Licensed under the Academic Free License version 2.1
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include "dbus-errors.h"
25 #include "dbus-internals.h"
26 #include "dbus-string.h"
27 #include "dbus-protocol.h"
32 * @defgroup DBusErrorInternals Error reporting internals
33 * @ingroup DBusInternals
34 * @brief Error reporting internals
39 * Internals of DBusError
43 const char *name; /**< error name */
44 char *message; /**< error message */
46 unsigned int const_message : 1; /**< Message is not owned by DBusError */
48 unsigned int dummy2 : 1; /**< placeholder */
49 unsigned int dummy3 : 1; /**< placeholder */
50 unsigned int dummy4 : 1; /**< placeholder */
51 unsigned int dummy5 : 1; /**< placeholder */
53 void *padding1; /**< placeholder */
58 * Returns a longer message describing an error name.
59 * If the error name is unknown, returns the name
62 * @param error the error to describe
63 * @returns a constant string describing the error.
66 message_from_error (const char *error)
68 if (strcmp (error, DBUS_ERROR_FAILED) == 0)
69 return "Unknown error";
70 else if (strcmp (error, DBUS_ERROR_NO_MEMORY) == 0)
71 return "Not enough memory available";
72 else if (strcmp (error, DBUS_ERROR_IO_ERROR) == 0)
73 return "Error reading or writing data";
74 else if (strcmp (error, DBUS_ERROR_BAD_ADDRESS) == 0)
75 return "Could not parse address";
76 else if (strcmp (error, DBUS_ERROR_NOT_SUPPORTED) == 0)
77 return "Feature not supported";
78 else if (strcmp (error, DBUS_ERROR_LIMITS_EXCEEDED) == 0)
79 return "Resource limits exceeded";
80 else if (strcmp (error, DBUS_ERROR_ACCESS_DENIED) == 0)
81 return "Permission denied";
82 else if (strcmp (error, DBUS_ERROR_AUTH_FAILED) == 0)
83 return "Could not authenticate to server";
84 else if (strcmp (error, DBUS_ERROR_NO_SERVER) == 0)
85 return "No server available at address";
86 else if (strcmp (error, DBUS_ERROR_TIMEOUT) == 0)
87 return "Connection timed out";
88 else if (strcmp (error, DBUS_ERROR_NO_NETWORK) == 0)
89 return "Network unavailable";
90 else if (strcmp (error, DBUS_ERROR_ADDRESS_IN_USE) == 0)
91 return "Address already in use";
92 else if (strcmp (error, DBUS_ERROR_DISCONNECTED) == 0)
93 return "Disconnected.";
94 else if (strcmp (error, DBUS_ERROR_INVALID_ARGS) == 0)
95 return "Invalid arguments.";
96 else if (strcmp (error, DBUS_ERROR_NO_REPLY) == 0)
97 return "Did not get a reply message.";
98 else if (strcmp (error, DBUS_ERROR_FILE_NOT_FOUND) == 0)
99 return "File doesn't exist.";
104 /** @} */ /* End of internals */
107 * @defgroup DBusErrors Error reporting
109 * @brief Error reporting
111 * Types and functions related to reporting errors.
114 * In essence D-BUS error reporting works as follows:
118 * dbus_error_init (&error);
119 * dbus_some_function (arg1, arg2, &error);
120 * if (dbus_error_is_set (&error))
122 * fprintf (stderr, "an error occurred: %s\n", error.message);
123 * dbus_error_free (&error);
127 * There are some rules. An error passed to a D-BUS function must
128 * always be unset; you can't pass in an error that's already set. If
129 * a function has a return code indicating whether an error occurred,
130 * and also a #DBusError parameter, then the error will always be set
131 * if and only if the return code indicates an error occurred. i.e.
132 * the return code and the error are never going to disagree.
134 * An error only needs to be freed if it's been set, not if
135 * it's merely been initialized.
137 * You can check the specific error that occurred using
138 * dbus_error_has_name().
144 * Initializes a DBusError structure. Does not allocate
145 * any memory; the error only needs to be freed
146 * if it is set at some point.
148 * @param error the DBusError.
151 dbus_error_init (DBusError *error)
155 _dbus_return_if_fail (error != NULL);
157 _dbus_assert (sizeof (DBusError) == sizeof (DBusRealError));
159 real = (DBusRealError *)error;
162 real->message = NULL;
164 real->const_message = TRUE;
168 * Frees an error that's been set (or just initialized),
169 * then reinitializes the error as in dbus_error_init().
171 * @param error memory where the error is stored.
174 dbus_error_free (DBusError *error)
178 _dbus_return_if_fail (error != NULL);
180 real = (DBusRealError *)error;
182 if (!real->const_message)
184 dbus_free (real->name);
185 dbus_free (real->message);
188 dbus_error_init (error);
192 * Assigns an error name and message to a DBusError. Does nothing if
193 * error is #NULL. The message may be NULL, which means a default
194 * message will be deduced from the name. If the error name is unknown
195 * to D-BUS the default message will be totally useless, though.
197 * @todo should be called dbus_error_set_const()
199 * @param error the error.
200 * @param name the error name (not copied!!!)
201 * @param message the error message (not copied!!!)
204 dbus_set_error_const (DBusError *error,
210 _dbus_return_if_error_is_set (error);
211 _dbus_return_if_fail (name != NULL);
216 _dbus_assert (error->name == NULL);
217 _dbus_assert (error->message == NULL);
220 message = message_from_error (name);
222 real = (DBusRealError *)error;
225 real->message = (char *)message;
226 real->const_message = TRUE;
230 * Moves an error src into dest, freeing src and
231 * overwriting dest. Both src and dest must be initialized.
232 * src is reinitialized to an empty error. dest may not
233 * contain an existing error. If the destination is
234 * #NULL, just frees and reinits the source error.
236 * @param src the source error
237 * @param dest the destination error or #NULL
240 dbus_move_error (DBusError *src,
243 _dbus_return_if_error_is_set (dest);
247 dbus_error_free (dest);
249 dbus_error_init (src);
252 dbus_error_free (src);
256 * Checks whether the error is set and has the given
258 * @param error the error
259 * @param name the name
260 * @returns #TRUE if the given named error occurred
263 dbus_error_has_name (const DBusError *error,
266 _dbus_return_val_if_fail (error != NULL, FALSE);
267 _dbus_return_val_if_fail (name != NULL, FALSE);
269 _dbus_assert ((error->name != NULL && error->message != NULL) ||
270 (error->name == NULL && error->message == NULL));
272 if (error->name != NULL)
274 DBusString str1, str2;
275 _dbus_string_init_const (&str1, error->name);
276 _dbus_string_init_const (&str2, name);
277 return _dbus_string_equal (&str1, &str2);
284 * Checks whether an error occurred (the error is set).
286 * @param error the error object
287 * @returns #TRUE if an error occurred
290 dbus_error_is_set (const DBusError *error)
292 _dbus_return_val_if_fail (error != NULL, FALSE);
293 _dbus_assert ((error->name != NULL && error->message != NULL) ||
294 (error->name == NULL && error->message == NULL));
295 return error->name != NULL;
299 * Assigns an error name and message to a DBusError.
300 * Does nothing if error is #NULL.
302 * The format may be NULL, which means a default message will be
303 * deduced from the name. If the error name is unknown to D-BUS the
304 * default message will be totally useless, though.
306 * If no memory can be allocated for the error message,
307 * an out-of-memory error message will be set instead.
309 * @todo should be called dbus_error_set()
311 * @param error the error.
312 * @param name the error name
313 * @param format printf-style format string.
316 dbus_set_error (DBusError *error,
328 /* it's a bug to pile up errors */
329 _dbus_return_if_error_is_set (error);
330 _dbus_return_if_fail (name != NULL);
332 _dbus_assert (error->name == NULL);
333 _dbus_assert (error->message == NULL);
335 if (!_dbus_string_init (&str))
340 if (!_dbus_string_append (&str,
341 message_from_error (name)))
343 _dbus_string_free (&str);
349 va_start (args, format);
350 if (!_dbus_string_append_printf_valist (&str, format, args))
352 _dbus_string_free (&str);
358 real = (DBusRealError *)error;
360 if (!_dbus_string_steal_data (&str, &real->message))
362 _dbus_string_free (&str);
365 _dbus_string_free (&str);
367 real->name = _dbus_strdup (name);
368 if (real->name == NULL)
370 dbus_free (real->message);
371 real->message = NULL;
374 real->const_message = FALSE;
379 _DBUS_SET_OOM (error);
382 /** @} */ /* End public API */