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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_BACKTRACE_SYMBOLS
#include <execinfo.h>
#endif /* HAVE_BACKTRACE_SYMBOLS */
#include <isc/backtrace.h>
#include <isc/print.h>
#include <isc/result.h>
#include <isc/util.h>
#if HAVE_BACKTRACE_SYMBOLS
int
isc_backtrace(void **addrs, int maxaddrs) {
int n;
/*
* Validate the arguments: intentionally avoid using REQUIRE().
* See notes in backtrace.h.
*/
if (addrs == NULL || maxaddrs <= 0) {
return (-1);
}
/*
* backtrace(3) includes this function itself in the address array,
* which should be eliminated from the returned sequence.
*/
n = backtrace(addrs, maxaddrs);
if (n < 2) {
return (-1);
}
n--;
memmove(addrs, &addrs[1], sizeof(addrs[0]) * n);
return (n);
}
char **
isc_backtrace_symbols(void *const *buffer, int size) {
return (backtrace_symbols(buffer, size));
}
void
isc_backtrace_symbols_fd(void *const *buffer, int size, int fd) {
backtrace_symbols_fd(buffer, size, fd);
}
#else /* HAVE_BACKTRACE_SYMBOLS */
int
isc_backtrace(void **addrs, int maxaddrs) {
UNUSED(addrs);
UNUSED(maxaddrs);
return (-1);
}
char **
isc_backtrace_symbols(void *const *buffer, int size) {
UNUSED(buffer);
UNUSED(size);
return (NULL);
}
void
isc_backtrace_symbols_fd(void *const *buffer, int size, int fd) {
UNUSED(buffer);
UNUSED(size);
UNUSED(fd);
}
#endif /* HAVE_BACKTRACE_SYMBOLS */
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