149 lines
4.6 KiB
C++
149 lines
4.6 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 <debuggerd/client.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <chrono>
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include <android-base/unique_fd.h>
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#include <cutils/sockets.h>
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#include <debuggerd/handler.h>
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#include <debuggerd/protocol.h>
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#include <debuggerd/util.h>
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using android::base::unique_fd;
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static bool send_signal(pid_t pid, bool backtrace) {
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sigval val;
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val.sival_int = backtrace;
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if (sigqueue(pid, DEBUGGER_SIGNAL, val) != 0) {
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PLOG(ERROR) << "libdebuggerd_client: failed to send signal to pid " << pid;
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return false;
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}
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return true;
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}
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bool debuggerd_trigger_dump(pid_t pid, unique_fd output_fd, DebuggerdDumpType dump_type,
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int timeout_ms) {
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LOG(INFO) << "libdebuggerd_client: started dumping process " << pid;
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unique_fd sockfd;
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const auto end = std::chrono::steady_clock::now() + std::chrono::milliseconds(timeout_ms);
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auto set_timeout = [timeout_ms, &sockfd, &end]() {
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if (timeout_ms <= 0) {
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return true;
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}
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auto now = std::chrono::steady_clock::now();
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if (now > end) {
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return false;
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}
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auto time_left = std::chrono::duration_cast<std::chrono::microseconds>(end - now);
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auto seconds = std::chrono::duration_cast<std::chrono::seconds>(time_left);
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auto microseconds = std::chrono::duration_cast<std::chrono::microseconds>(time_left - seconds);
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struct timeval timeout = {
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.tv_sec = static_cast<long>(seconds.count()),
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.tv_usec = static_cast<long>(microseconds.count()),
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};
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if (setsockopt(sockfd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout)) != 0) {
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return false;
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}
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if (setsockopt(sockfd, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout)) != 0) {
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return false;
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}
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return true;
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};
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sockfd.reset(socket(AF_LOCAL, SOCK_SEQPACKET, 0));
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if (sockfd == -1) {
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PLOG(ERROR) << "libdebugger_client: failed to create socket";
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return false;
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}
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if (!set_timeout()) {
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PLOG(ERROR) << "libdebugger_client: failed to set timeout";
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return false;
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}
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if (socket_local_client_connect(sockfd.get(), kTombstonedInterceptSocketName,
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ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_SEQPACKET) == -1) {
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PLOG(ERROR) << "libdebuggerd_client: failed to connect to tombstoned";
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return false;
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}
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InterceptRequest req = {.pid = pid };
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if (!set_timeout()) {
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PLOG(ERROR) << "libdebugger_client: failed to set timeout";
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}
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if (send_fd(sockfd.get(), &req, sizeof(req), std::move(output_fd)) != sizeof(req)) {
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PLOG(ERROR) << "libdebuggerd_client: failed to send output fd to tombstoned";
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return false;
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}
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bool backtrace = dump_type == kDebuggerdBacktrace;
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send_signal(pid, backtrace);
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if (!set_timeout()) {
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PLOG(ERROR) << "libdebugger_client: failed to set timeout";
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}
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InterceptResponse response;
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ssize_t rc = TEMP_FAILURE_RETRY(recv(sockfd.get(), &response, sizeof(response), MSG_TRUNC));
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if (rc == 0) {
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LOG(ERROR) << "libdebuggerd_client: failed to read response from tombstoned: timeout reached?";
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return false;
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} else if (rc != sizeof(response)) {
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LOG(ERROR)
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<< "libdebuggerd_client: received packet of unexpected length from tombstoned: expected "
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<< sizeof(response) << ", received " << rc;
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return false;
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}
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if (response.success != 1) {
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response.error_message[sizeof(response.error_message) - 1] = '\0';
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LOG(ERROR) << "libdebuggerd_client: tombstoned reported failure: " << response.error_message;
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}
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LOG(INFO) << "libdebuggerd_client: done dumping process " << pid;
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return true;
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}
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int dump_backtrace_to_file(pid_t tid, int fd) {
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return dump_backtrace_to_file_timeout(tid, fd, 0);
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}
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int dump_backtrace_to_file_timeout(pid_t tid, int fd, int timeout_secs) {
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android::base::unique_fd copy(dup(fd));
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if (copy == -1) {
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return -1;
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}
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int timeout_ms = timeout_secs > 0 ? timeout_secs * 1000 : 0;
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return debuggerd_trigger_dump(tid, std::move(copy), kDebuggerdBacktrace, timeout_ms) ? 0 : -1;
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}
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