147 lines
4.9 KiB
C++
147 lines
4.9 KiB
C++
/*
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* Copyright (C) 2019 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 <android-base/logging.h>
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#include <errno.h>
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#include <log/log.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 <sys/inotify.h>
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#include <unistd.h>
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#include <fstream>
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#include <cutils/properties.h>
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#include <gflags/gflags.h>
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#include "common/libs/fs/shared_fd.h"
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#include "common/libs/utils/subprocess.h"
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static const char TOMBSTONE_DIR[] = "/data/tombstones/";
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// returns a fd which when read from, provides inotify events when tombstones
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// are created
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static int new_tombstone_create_notifier(void) {
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int file_create_notification_handle = inotify_init();
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if (file_create_notification_handle == -1) {
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ALOGE("%s: inotify_init failure error: '%s' (%d)", __FUNCTION__,
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strerror(errno), errno);
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return -1;
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}
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int watch_descriptor = inotify_add_watch(file_create_notification_handle,
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TOMBSTONE_DIR, IN_CREATE);
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if (watch_descriptor == -1) {
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ALOGE("%s: Could not add watch for '%s', error: '%s' (%d)", __FUNCTION__,
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TOMBSTONE_DIR, strerror(errno), errno);
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close(file_create_notification_handle);
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return -1;
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}
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return file_create_notification_handle;
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}
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#define INOTIFY_MAX_EVENT_SIZE (sizeof(struct inotify_event) + NAME_MAX + 1)
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static std::vector<std::string> get_next_tombstones_path_blocking(int fd) {
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char event_readout[INOTIFY_MAX_EVENT_SIZE];
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int bytes_parsed = 0;
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std::vector<std::string> tombstone_paths;
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// Each successful read can contain one or more of inotify_event events
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// Note: read() on inotify returns 'whole' events, will never partially
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// populate the buffer.
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int event_read_out_length = read(fd, event_readout, INOTIFY_MAX_EVENT_SIZE);
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if(event_read_out_length == -1) {
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ALOGE("%s: Couldn't read out inotify event due to error: '%s' (%d)",
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__FUNCTION__, strerror(errno), errno);
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return std::vector<std::string>();
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}
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while (bytes_parsed < event_read_out_length) {
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struct inotify_event* event =
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reinterpret_cast<inotify_event*>(event_readout + bytes_parsed);
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bytes_parsed += sizeof(struct inotify_event) + event->len;
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// No file name was present
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if (event->len == 0) {
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ALOGE("%s: inotify event didn't contain filename", __FUNCTION__);
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continue;
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}
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if (!(event->mask & IN_CREATE)) {
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ALOGE("%s: inotify event didn't pertain to file creation", __FUNCTION__);
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continue;
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}
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tombstone_paths.push_back(std::string(TOMBSTONE_DIR) +
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std::string(event->name));
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}
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return tombstone_paths;
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}
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DEFINE_uint32(port,
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static_cast<uint32_t>(
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property_get_int64("ro.boot.vsock_tombstone_port", 0)),
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"VSOCK port to send tombstones to");
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DEFINE_uint32(cid, 2, "VSOCK CID to send logcat output to");
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#define TOMBSTONE_BUFFER_SIZE (1024)
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int main(int argc, char** argv) {
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gflags::ParseCommandLineFlags(&argc, &argv, true);
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if(FLAGS_port == 0) {
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LOG(FATAL_WITHOUT_ABORT) << "Port flag is required";
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while(1) {sleep(1);};
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}
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int file_create_notification_handle = new_tombstone_create_notifier();
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if (file_create_notification_handle == -1) {return -1;}
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LOG(INFO) << "tombstone watcher successfully initialized";
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while (true) {
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std::vector<std::string> ts_paths =
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get_next_tombstones_path_blocking(file_create_notification_handle);
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for (auto& ts_path : ts_paths) {
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auto log_fd =
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cuttlefish::SharedFD::VsockClient(FLAGS_cid, FLAGS_port, SOCK_STREAM);
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std::ifstream ifs(ts_path);
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char buffer[TOMBSTONE_BUFFER_SIZE];
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uint num_transfers = 0;
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int num_bytes_read = 0;
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while (log_fd->IsOpen() && ifs.is_open() && !ifs.eof()) {
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ifs.read(buffer, sizeof(buffer));
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num_bytes_read += ifs.gcount();
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log_fd->Write(buffer, ifs.gcount());
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num_transfers++;
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}
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if (!log_fd->IsOpen()) {
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auto error = log_fd->StrError();
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ALOGE("Unable to connect to vsock:%u:%u: %s", FLAGS_cid, FLAGS_port,
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error.c_str());
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} else if (!ifs.is_open()) {
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ALOGE("%s closed in the middle of readout.", ts_path.c_str());
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} else {
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LOG(INFO) << num_bytes_read << " chars transferred from "
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<< ts_path.c_str() << " over " << num_transfers << " "
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<< TOMBSTONE_BUFFER_SIZE << " byte sized transfers";
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}
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}
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}
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return 0;
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}
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