a73df601b7
All intercept requests and crash dump requests must now specify a dump_type, which can be one of kDebuggerdNativeBacktrace, kDebuggerdTombstone or kDebuggerdJavaBacktrace. Each process can have only one outstanding intercept registered at a time. There's only one non-trivial change in this changeset; and that is to crash_dump. We now pass the type of dump via a command line argument instead of inferring it from the (resent) signal, this allows us to connect to tombstoned before we wait for the signal as the protocol requires. Test: debuggerd_test Change-Id: I189b215acfecd08ac52ab29117e3465da00e3a37
90 lines
3.3 KiB
C++
90 lines
3.3 KiB
C++
/*
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* Copyright 2017, 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 "tombstoned/tombstoned.h"
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#include <fcntl.h>
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#include <unistd.h>
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#include <utility>
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#include <android-base/unique_fd.h>
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#include <async_safe/log.h>
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#include <cutils/sockets.h>
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#include "protocol.h"
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#include "util.h"
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using android::base::unique_fd;
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bool tombstoned_connect(pid_t pid, unique_fd* tombstoned_socket, unique_fd* output_fd,
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DebuggerdDumpType dump_type) {
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unique_fd sockfd(
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socket_local_client((dump_type != kDebuggerdJavaBacktrace ? kTombstonedCrashSocketName
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: kTombstonedJavaTraceSocketName),
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ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_SEQPACKET));
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if (sockfd == -1) {
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async_safe_format_log(ANDROID_LOG_ERROR, "libc", "failed to connect to tombstoned: %s",
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strerror(errno));
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return false;
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}
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TombstonedCrashPacket packet = {};
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packet.packet_type = CrashPacketType::kDumpRequest;
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packet.packet.dump_request.pid = pid;
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packet.packet.dump_request.dump_type = dump_type;
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if (TEMP_FAILURE_RETRY(write(sockfd, &packet, sizeof(packet))) != sizeof(packet)) {
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async_safe_format_log(ANDROID_LOG_ERROR, "libc", "failed to write DumpRequest packet: %s",
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strerror(errno));
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return false;
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}
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unique_fd tmp_output_fd;
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ssize_t rc = recv_fd(sockfd, &packet, sizeof(packet), &tmp_output_fd);
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if (rc == -1) {
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async_safe_format_log(ANDROID_LOG_ERROR, "libc",
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"failed to read response to DumpRequest packet: %s", strerror(errno));
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return false;
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} else if (rc != sizeof(packet)) {
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async_safe_format_log(
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ANDROID_LOG_ERROR, "libc",
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"received DumpRequest response packet of incorrect length (expected %zu, got %zd)",
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sizeof(packet), rc);
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return false;
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}
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// Make the fd O_APPEND so that our output is guaranteed to be at the end of a file.
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// (This also makes selinux rules consistent, because selinux distinguishes between writing to
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// a regular fd, and writing to an fd with O_APPEND).
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int flags = fcntl(tmp_output_fd.get(), F_GETFL);
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if (fcntl(tmp_output_fd.get(), F_SETFL, flags | O_APPEND) != 0) {
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async_safe_format_log(ANDROID_LOG_WARN, "libc", "failed to set output fd flags: %s",
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strerror(errno));
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}
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*tombstoned_socket = std::move(sockfd);
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*output_fd = std::move(tmp_output_fd);
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return true;
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}
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bool tombstoned_notify_completion(int tombstoned_socket) {
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TombstonedCrashPacket packet = {};
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packet.packet_type = CrashPacketType::kCompletedDump;
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if (TEMP_FAILURE_RETRY(write(tombstoned_socket, &packet, sizeof(packet))) != sizeof(packet)) {
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return false;
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}
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return true;
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}
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