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/*******************************************************************************
* Copyright (c) 2007, 2011 Wind River Systems, Inc. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v1.0 which accompany this distribution.
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
* You may elect to redistribute this code under either of these licenses.
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
/*
* Exception handling. Functionality is similar to C++ try/catch.
* Usage example:
Trap trap;
if (set_trap(&trap)) {
// Some code that can throw an exception by calling exception()
...
clear_trap(&trap);
}
else {
// Exception handling code
if (trap.error == ...
...
}
* Only main thread is allowed to use exceptions.
*/
#include <tcf/config.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <assert.h>
#include <tcf/framework/exceptions.h>
#include <tcf/framework/myalloc.h>
#include <tcf/framework/events.h>
#include <tcf/framework/trace.h>
static Trap * chain = NULL;
int set_trap_a(Trap * trap) {
assert(is_dispatch_thread());
memset(trap, 0, sizeof(Trap));
trap->next = chain;
chain = trap;
return 0;
}
int set_trap_b(Trap * trap) {
if (trap->error == 0) return 1;
assert(trap == chain);
chain = trap->next;
return 0;
}
void clear_trap(Trap * trap) {
assert(is_dispatch_thread());
assert(trap == chain);
chain = trap->next;
}
void exception(int error) {
assert(is_dispatch_thread());
assert(error != 0);
if (chain == NULL) {
trace(LOG_ALWAYS, "Unhandled exception %d: %s.",
error, errno_to_str(error));
exit(error);
}
errno = chain->error = error;
longjmp(chain->env, 1);
}
void str_exception(int error, const char * msg) {
exception(set_errno(error, msg));
}
void str_fmt_exception(int error, const char * fmt, ...) {
va_list vaList;
char * buf = NULL;
size_t len = 100;
int n;
while (1) {
buf = (char *)loc_realloc(buf, len);
va_start(vaList, fmt);
n = vsnprintf(buf, len, fmt, vaList);
va_end(vaList);
if (n < (int)len) break;
len = n + 1;
}
error = set_errno(error, buf);
loc_free(buf);
exception(error);
}
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