1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-internals.c random utility stuff (internal to D-BUS implementation)
4 * Copyright (C) 2002, 2003 Red Hat, Inc.
6 * Licensed under the Academic Free License version 1.2
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include "dbus-internals.h"
24 #include "dbus-protocol.h"
25 #include "dbus-test.h"
29 #include <sys/types.h>
36 * @defgroup DBusInternals D-BUS internal implementation details
37 * @brief Documentation useful when developing or debugging D-BUS itself.
42 * @defgroup DBusInternalsUtils Utilities and portability
43 * @ingroup DBusInternals
44 * @brief Utility functions (_dbus_assert(), _dbus_warn(), etc.)
51 * Aborts with an error message if the condition is false.
53 * @param condition condition which must be true.
57 * @def _dbus_assert_not_reached
59 * Aborts with an error message if called.
60 * The given explanation will be printed.
62 * @param explanation explanation of what happened if the code was reached.
66 * @def _DBUS_N_ELEMENTS
68 * Computes the number of elements in a fixed-size array using
71 * @param array the array to count elements in.
75 * @def _DBUS_POINTER_TO_INT
77 * Safely casts a void* to an integer; should only be used on void*
78 * that actually contain integers, for example one created with
79 * _DBUS_INT_TO_POINTER. Only guaranteed to preserve 32 bits.
80 * (i.e. it's used to store 32-bit ints in pointers, but
81 * can't be used to store 64-bit pointers in ints.)
83 * @param pointer pointer to extract an integer from.
86 * @def _DBUS_INT_TO_POINTER
88 * Safely stuffs an integer into a pointer, to be extracted later with
89 * _DBUS_POINTER_TO_INT. Only guaranteed to preserve 32 bits.
91 * @param integer the integer to stuff into a pointer.
96 * Sets all bits in an object to zero.
98 * @param object the object to be zeroed.
103 * Minimum value of type "int"
108 * Maximum value of type "int"
112 * @typedef DBusForeachFunction
114 * Used to iterate over each item in a collection, such as
119 * @def _DBUS_LOCK_NAME
121 * Expands to name of a global lock variable.
125 * @def _DBUS_DEFINE_GLOBAL_LOCK
127 * Defines a global lock variable with the given name.
128 * The lock must be added to the list to initialize
129 * in dbus_threads_init().
133 * @def _DBUS_DECLARE_GLOBAL_LOCK
135 * Expands to declaration of a global lock defined
136 * with _DBUS_DEFINE_GLOBAL_LOCK.
137 * The lock must be added to the list to initialize
138 * in dbus_threads_init().
144 * Locks a global lock
150 * Unlocks a global lock
154 * Fixed "out of memory" error message, just to avoid
155 * making up a different string every time and wasting
158 const char _dbus_no_memory_message[] = "Not enough memory";
161 * Prints a warning message to stderr.
163 * @param format printf-style format string.
166 _dbus_warn (const char *format,
169 /* FIXME not portable enough? */
172 va_start (args, format);
173 vfprintf (stderr, format, args);
178 * Prints a warning message to stderr
179 * if the user has enabled verbose mode.
180 * This is the real function implementation,
181 * use _dbus_verbose() macro in code.
183 * @param format printf-style format string.
186 _dbus_verbose_real (const char *format,
190 static dbus_bool_t verbose = TRUE;
191 static dbus_bool_t initted = FALSE;
192 static unsigned long pid;
194 /* things are written a bit oddly here so that
195 * in the non-verbose case we just have the one
196 * conditional and return immediately.
203 verbose = _dbus_getenv ("DBUS_VERBOSE") != NULL;
204 pid = _dbus_getpid ();
210 fprintf (stderr, "%lu: ", pid);
212 va_start (args, format);
213 vfprintf (stderr, format, args);
218 * Duplicates a string. Result must be freed with
219 * dbus_free(). Returns #NULL if memory allocation fails.
220 * If the string to be duplicated is #NULL, returns #NULL.
222 * @param str string to duplicate.
223 * @returns newly-allocated copy.
226 _dbus_strdup (const char *str)
236 copy = dbus_malloc (len + 1);
240 memcpy (copy, str, len + 1);
246 * Duplicates a string array. Result may be freed with
247 * dbus_free_string_array(). Returns #NULL if memory allocation fails.
248 * If the array to be duplicated is #NULL, returns #NULL.
250 * @param array array to duplicate.
251 * @returns newly-allocated copy.
254 _dbus_dup_string_array (const char **array)
263 for (len = 0; array[len] != NULL; ++len)
266 copy = dbus_new0 (char*, len + 1);
273 copy[i] = _dbus_strdup (array[i]);
276 dbus_free_string_array (copy);
287 * Checks whether a string array contains the given string.
289 * @param array array to search.
290 * @param str string to look for
291 * @returns #TRUE if array contains string
294 _dbus_string_array_contains (const char **array,
300 while (array[i] != NULL)
302 if (strcmp (array[i], str) == 0)
311 * Returns a string describing the given type.
313 * @param type the type to describe
314 * @returns a constant string describing the type
317 _dbus_type_to_string (int type)
321 case DBUS_TYPE_INVALID:
325 case DBUS_TYPE_BOOLEAN:
327 case DBUS_TYPE_INT32:
329 case DBUS_TYPE_UINT32:
331 case DBUS_TYPE_DOUBLE:
333 case DBUS_TYPE_STRING:
335 case DBUS_TYPE_NAMED:
337 case DBUS_TYPE_ARRAY:
346 #ifndef DBUS_DISABLE_ASSERT
348 * Internals of _dbus_assert(); it's a function
349 * rather than a macro with the inline code so
350 * that the assertion failure blocks don't show up
351 * in test suite coverage, and to shrink code size.
353 * @param condition TRUE if assertion succeeded
354 * @param condition_text condition as a string
355 * @param file file the assertion is in
356 * @param line line the assertion is in
359 _dbus_real_assert (dbus_bool_t condition,
360 const char *condition_text,
366 _dbus_warn ("Assertion failed \"%s\" file \"%s\" line %d process %lu\n",
367 condition_text, file, line, _dbus_getpid ());
373 * Internals of _dbus_assert_not_reached(); it's a function
374 * rather than a macro with the inline code so
375 * that the assertion failure blocks don't show up
376 * in test suite coverage, and to shrink code size.
378 * @param explanation what was reached that shouldn't have been
379 * @param file file the assertion is in
380 * @param line line the assertion is in
383 _dbus_real_assert_not_reached (const char *explanation,
387 _dbus_warn ("File \"%s\" line %d process %lu should not have been reached: %s\n",
388 file, line, _dbus_getpid (), explanation);
391 #endif /* DBUS_DISABLE_ASSERT */
393 #ifdef DBUS_BUILD_TESTS
395 run_failing_each_malloc (int n_mallocs,
396 const char *description,
397 DBusTestMemoryFunction func,
400 n_mallocs += 10; /* fudge factor to ensure reallocs etc. are covered */
402 while (n_mallocs >= 0)
404 _dbus_set_fail_alloc_counter (n_mallocs);
406 _dbus_verbose ("\n===\n%s: (will fail malloc %d with %d failures)\n===\n",
407 description, n_mallocs,
408 _dbus_get_fail_alloc_failures ());
410 if (!(* func) (data))
416 _dbus_set_fail_alloc_counter (_DBUS_INT_MAX);
422 * Tests how well the given function responds to out-of-memory
423 * situations. Calls the function repeatedly, failing a different
424 * call to malloc() each time. If the function ever returns #FALSE,
425 * the test fails. The function should return #TRUE whenever something
426 * valid (such as returning an error, or succeeding) occurs, and #FALSE
427 * if it gets confused in some way.
429 * @param description description of the test used in verbose output
430 * @param func function to call
431 * @param data data to pass to function
432 * @returns #TRUE if the function never returns FALSE
435 _dbus_test_oom_handling (const char *description,
436 DBusTestMemoryFunction func,
441 /* Run once to see about how many mallocs are involved */
443 _dbus_set_fail_alloc_counter (_DBUS_INT_MAX);
445 _dbus_verbose ("Running once to count mallocs\n");
447 if (!(* func) (data))
450 approx_mallocs = _DBUS_INT_MAX - _dbus_get_fail_alloc_counter ();
452 _dbus_verbose ("\n=================\n%s: about %d mallocs total\n=================\n",
453 description, approx_mallocs);
455 _dbus_set_fail_alloc_failures (1);
456 if (!run_failing_each_malloc (approx_mallocs, description, func, data))
459 _dbus_set_fail_alloc_failures (2);
460 if (!run_failing_each_malloc (approx_mallocs, description, func, data))
463 _dbus_set_fail_alloc_failures (3);
464 if (!run_failing_each_malloc (approx_mallocs, description, func, data))
467 _dbus_set_fail_alloc_failures (4);
468 if (!run_failing_each_malloc (approx_mallocs, description, func, data))
471 _dbus_verbose ("\n=================\n%s: all iterations passed\n=================\n",
476 #endif /* DBUS_BUILD_TESTS */