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/*************************************************************************
* Copyright (C) 2009-2014 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 "internal.h"
#include "internal/platform.h"
#include <errno.h>
#include <pthread.h>
#include <stdatomic.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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)
/// The default fatal error handler.
static void dmnsn_default_fatal_error_fn(void);
/// The current fatal error handler.
static atomic(dmnsn_fatal_error_fn *) dmnsn_fatal = ATOMIC_VAR_INIT(dmnsn_default_fatal_error_fn);
/// The current resilience.
static atomic_bool dmnsn_always_die = ATOMIC_VAR_INIT(false);
void
dmnsn_report_impl(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 = atomic_load(&dmnsn_always_die);
// 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_STRERROR_R
char errbuf[256];
if (strerror_r(err, errbuf, 256) == 0) {
fprintf(stderr, " (%s)", errbuf);
}
#elif 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_report_warning(const char *func, const char *file, unsigned int line, const char *str)
{
dmnsn_report_impl(false, func, file, line, str);
}
DMNSN_NORETURN
dmnsn_report_error(const char *func, const char *file, unsigned int line, const char *str)
{
dmnsn_report_impl(true, func, file, line, str);
DMNSN_UNREACHABLE();
}
void
dmnsn_die_on_warnings(bool always_die)
{
atomic_store(&dmnsn_always_die, always_die);
}
dmnsn_fatal_error_fn *
dmnsn_get_fatal_error_fn(void)
{
dmnsn_fatal_error_fn *fatal = atomic_load(&dmnsn_fatal);
return fatal;
}
void
dmnsn_set_fatal_error_fn(dmnsn_fatal_error_fn *fatal)
{
atomic_store(&dmnsn_fatal, fatal);
}
static void
dmnsn_default_fatal_error_fn(void)
{
if (dmnsn_is_main_thread()) {
exit(EXIT_FAILURE);
} else {
pthread_exit(NULL);
}
}
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