2d377cd688
.. for ART and the frameworks to link against. In the new stack dumping scheme (see related bug), the Java runtime will communicate with tombstoned in order to obtain a FD to which it can write its traces. Also move things around to separate headers that are private implementation details from headers that constitute the public debuggerd API. There are currently only three such headers : - tombstoned/tombstoned.h - debuggerd/client.h - debuggerd/handler.h Bug: 32064548 Test: make Change-Id: If1b8578550e373d84828b180bbe585f1088d1aa3
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
/*
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* Copyright 2016, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits>
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#include <thread>
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#include <android-base/file.h>
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#include <android-base/logging.h>
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#include <android-base/parseint.h>
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#include <android-base/unique_fd.h>
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#include <debuggerd/client.h>
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#include <selinux/selinux.h>
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#include "util.h"
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using android::base::unique_fd;
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static void usage(int exit_code) {
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fprintf(stderr, "usage: debuggerd [-b] PID\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "-b, --backtrace just a backtrace rather than a full tombstone\n");
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_exit(exit_code);
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}
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static std::thread spawn_redirect_thread(unique_fd fd) {
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return std::thread([fd{ std::move(fd) }]() {
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while (true) {
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char buf[BUFSIZ];
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ssize_t rc = TEMP_FAILURE_RETRY(read(fd.get(), buf, sizeof(buf)));
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if (rc <= 0) {
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return;
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}
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if (!android::base::WriteFully(STDOUT_FILENO, buf, rc)) {
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return;
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}
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}
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});
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}
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int main(int argc, char* argv[]) {
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if (argc <= 1) usage(0);
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if (argc > 3) usage(1);
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if (argc == 3 && strcmp(argv[1], "-b") != 0 && strcmp(argv[1], "--backtrace") != 0) usage(1);
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bool backtrace_only = argc == 3;
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pid_t pid;
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if (!android::base::ParseInt(argv[argc - 1], &pid, 1, std::numeric_limits<pid_t>::max())) {
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usage(1);
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}
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unique_fd piperead, pipewrite;
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if (!Pipe(&piperead, &pipewrite)) {
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err(1, "failed to create pipe");
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}
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std::thread redirect_thread = spawn_redirect_thread(std::move(piperead));
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if (!debuggerd_trigger_dump(pid, std::move(pipewrite),
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backtrace_only ? kDebuggerdBacktrace : kDebuggerdTombstone, 0)) {
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redirect_thread.join();
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errx(1, "failed to dump process %d", pid);
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}
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redirect_thread.join();
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return 0;
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}
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