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/*************************************************************************
* Copyright (C) 2009-2011 Tavian Barnes <tavianator@tavianator.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library is distributed in the hope that it will be *
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* Error handling.
*/
#include "dimension-internal.h"
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
/** Report internal errors in this file. */
#define DMNSN_LOCAL_ERROR(str) \
do { \
fprintf(stderr, "Dimension ERROR: %s, %s:%u: %s\n", \
DMNSN_FUNC, __FILE__, __LINE__, (str)); \
abort(); \
} while (0)
/** dmnsn_local_lock_mutex implementation. */
static void
dmnsn_local_lock_mutex_impl(pthread_mutex_t *mutex)
{
if (pthread_mutex_lock(mutex) != 0) {
DMNSN_LOCAL_ERROR("Couldn't lock mutex.");
}
}
/** dmnsn_local_unlock_mutex implementation. */
static void
dmnsn_local_unlock_mutex_impl(pthread_mutex_t *mutex)
{
if (pthread_mutex_unlock(mutex) != 0) {
DMNSN_LOCAL_ERROR("Couldn't lock mutex.");
}
}
/** Lock a mutex, bailing out without dmnsn_error() on error. */
#define dmnsn_local_lock_mutex(mutex) \
dmnsn_local_lock_mutex_impl((mutex)); {
/** Unlock a mutex, bailing out without dmnsn_error() on error. */
#define dmnsn_local_unlock_mutex(mutex) \
dmnsn_local_unlock_mutex_impl((mutex)); }
/** The default fatal error handler. */
static void dmnsn_default_fatal_error_fn(void);
/** The current fatal error handler. */
static dmnsn_fatal_error_fn *dmnsn_fatal = dmnsn_default_fatal_error_fn;
/** Mutex which protects \c dmnsn_fatal. */
static pthread_mutex_t dmnsn_fatal_mutex = PTHREAD_MUTEX_INITIALIZER;
/** The current resilience. */
static bool dmnsn_always_die = false;
/** Mutex which protects \c dmnsn_always_die. */
static pthread_mutex_t dmnsn_always_die_mutex = PTHREAD_MUTEX_INITIALIZER;
/* Called by dmnsn_error macro (don't call directly) */
void
dmnsn_report_error(bool die, const char *func, const char *file,
unsigned int line, const char *str)
{
/* Save the value of errno */
int err = errno;
bool always_die;
dmnsn_local_lock_mutex(&dmnsn_always_die_mutex);
always_die = dmnsn_always_die;
dmnsn_local_unlock_mutex(&dmnsn_always_die_mutex);
/* Print the diagnostic string */
fprintf(stderr, "Dimension %s: %s, %s:%u: %s\n",
die ? "ERROR" : "WARNING", func, file, line, str);
/* Print the value of errno */
if (err != 0) {
fprintf(stderr, "Last error: %d", err);
#if DMNSN_SYS_ERRLIST
if (err >= 0 && err < sys_nerr) {
fprintf(stderr, " (%s)", sys_errlist[err]);
}
#endif
fprintf(stderr, "\n");
}
/* Print a stack trace to standard error */
dmnsn_backtrace(stderr);
/* Call the fatal error handler if needed */
if (die || always_die) {
static __thread bool thread_exiting = false;
if (thread_exiting) {
if (die) {
/* Prevent infinite recursion if the fatal error function itself calls
dmnsn_error() (not dmnsn_warning()) */
DMNSN_LOCAL_ERROR("Error raised while in error handler, aborting.");
}
} else {
thread_exiting = true;
dmnsn_fatal_error_fn *fatal = dmnsn_get_fatal_error_fn();
fatal();
DMNSN_LOCAL_ERROR("Fatal error handler didn't exit.");
}
}
}
void
dmnsn_die_on_warnings(bool always_die)
{
dmnsn_local_lock_mutex(&dmnsn_always_die_mutex);
dmnsn_always_die = always_die;
dmnsn_local_unlock_mutex(&dmnsn_always_die_mutex);
}
dmnsn_fatal_error_fn *
dmnsn_get_fatal_error_fn(void)
{
dmnsn_fatal_error_fn *fatal;
dmnsn_local_lock_mutex(&dmnsn_fatal_mutex);
fatal = dmnsn_fatal;
dmnsn_local_unlock_mutex(&dmnsn_fatal_mutex);
return fatal;
}
void
dmnsn_set_fatal_error_fn(dmnsn_fatal_error_fn *fatal)
{
dmnsn_local_lock_mutex(&dmnsn_fatal_mutex);
dmnsn_fatal = fatal;
dmnsn_local_unlock_mutex(&dmnsn_fatal_mutex);
}
static void
dmnsn_default_fatal_error_fn(void)
{
if (dmnsn_is_main_thread()) {
exit(EXIT_FAILURE);
} else {
pthread_exit(NULL);
}
}
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