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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/debug/stack_trace.h"
#include <signal.h>
#include <sys/types.h>
#include <unistd.h>
#include "base/logging.h"
namespace base {
namespace debug {
StackTrace::StackTrace() {
}
StackTrace::StackTrace(const void* const* trace, size_t count) {
}
StackTrace::~StackTrace() {
}
const void* const* StackTrace::Addresses(size_t* count) const {
NOTIMPLEMENTED();
return NULL;
}
// Sends fake SIGSTKFLT signals to let the Android linker and debuggerd dump
// stack. See inlined comments and Android bionic/linker/debugger.c and
// system/core/debuggerd/debuggerd.c for details.
void StackTrace::PrintBacktrace() const {
// Get the current handler of SIGSTKFLT for later use.
sighandler_t sig_handler = signal(SIGSTKFLT, SIG_DFL);
signal(SIGSTKFLT, sig_handler);
// The Android linker will handle this signal and send a stack dumping request
// to debuggerd which will ptrace_attach this process. Before returning from
// the signal handler, the linker sets the signal handler to SIG_IGN.
kill(gettid(), SIGSTKFLT);
// Because debuggerd will wait for the process to be stopped by the actual
// signal in crashing scenarios, signal is sent again to met the expectation.
// Debuggerd will dump stack into the system log and /data/tombstones/ files.
// NOTE: If this process runs in the interactive shell, it will be put
// in the background. To resume it in the foreground, use 'fg' command.
kill(gettid(), SIGSTKFLT);
// Restore the signal handler so that this method can work the next time.
signal(SIGSTKFLT, sig_handler);
}
void StackTrace::OutputToStream(std::ostream* os) const {
NOTIMPLEMENTED();
}
std::string StackTrace::ToString() const {
NOTIMPLEMENTED();
return "";
}
} // namespace debug
} // namespace base
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