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218 lines
6.3 KiB
218 lines
6.3 KiB
/*
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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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#define TRACE_TAG FDEVENT
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#include "sysdeps.h"
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#include "fdevent_poll.h"
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <atomic>
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#include <deque>
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#include <functional>
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#include <list>
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#include <mutex>
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#include <optional>
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#include <unordered_map>
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#include <utility>
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#include <variant>
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#include <vector>
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#include <android-base/chrono_utils.h>
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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/stringprintf.h>
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#include <android-base/threads.h>
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#include "adb_io.h"
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#include "adb_trace.h"
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#include "adb_unique_fd.h"
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#include "adb_utils.h"
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#include "fdevent.h"
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#include "sysdeps/chrono.h"
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static void fdevent_interrupt(int fd, unsigned, void*) {
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char buf[BUFSIZ];
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ssize_t rc = TEMP_FAILURE_RETRY(adb_read(fd, buf, sizeof(buf)));
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if (rc == -1) {
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PLOG(FATAL) << "failed to read from fdevent interrupt fd";
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}
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}
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fdevent_context_poll::fdevent_context_poll() {
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int s[2];
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if (adb_socketpair(s) != 0) {
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PLOG(FATAL) << "failed to create fdevent interrupt socketpair";
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}
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if (!set_file_block_mode(s[0], false) || !set_file_block_mode(s[1], false)) {
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PLOG(FATAL) << "failed to make fdevent interrupt socket nonblocking";
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}
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this->interrupt_fd_.reset(s[0]);
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fdevent* fde = this->Create(unique_fd(s[1]), fdevent_interrupt, nullptr);
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CHECK(fde != nullptr);
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this->Add(fde, FDE_READ);
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}
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fdevent_context_poll::~fdevent_context_poll() {
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// Destroy calls virtual methods, but this class is final, so that's okay.
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this->Destroy(this->interrupt_fde_);
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}
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void fdevent_context_poll::Set(fdevent* fde, unsigned events) {
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CheckMainThread();
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fde->state = events;
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D("fdevent_set: %s, events = %u", dump_fde(fde).c_str(), events);
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}
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static std::string dump_pollfds(const std::vector<adb_pollfd>& pollfds) {
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std::string result;
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for (const auto& pollfd : pollfds) {
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std::string op;
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if (pollfd.events & POLLIN) {
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op += "R";
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}
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if (pollfd.events & POLLOUT) {
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op += "W";
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}
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android::base::StringAppendF(&result, " %d(%s)", pollfd.fd, op.c_str());
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}
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return result;
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}
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void fdevent_context_poll::Loop() {
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main_thread_id_ = android::base::GetThreadId();
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std::vector<adb_pollfd> pollfds;
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std::vector<fdevent_event> poll_events;
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while (true) {
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if (terminate_loop_) {
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break;
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}
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D("--- --- waiting for events");
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pollfds.clear();
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for (const auto& [fd, fde] : this->installed_fdevents_) {
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adb_pollfd pfd;
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pfd.fd = fd;
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pfd.events = 0;
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if (fde.state & FDE_READ) {
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pfd.events |= POLLIN;
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}
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if (fde.state & FDE_WRITE) {
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pfd.events |= POLLOUT;
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}
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if (fde.state & FDE_ERROR) {
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pfd.events |= POLLERR;
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}
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#if defined(__linux__)
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pfd.events |= POLLRDHUP;
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#endif
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pfd.revents = 0;
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pollfds.push_back(pfd);
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}
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CHECK_GT(pollfds.size(), 0u);
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D("poll(), pollfds = %s", dump_pollfds(pollfds).c_str());
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std::optional<std::chrono::milliseconds> timeout = CalculatePollDuration();
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int timeout_ms;
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if (!timeout) {
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timeout_ms = -1;
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} else {
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timeout_ms = timeout->count();
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}
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int ret = adb_poll(pollfds.data(), pollfds.size(), timeout_ms);
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if (ret == -1) {
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PLOG(ERROR) << "poll(), ret = " << ret;
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return;
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}
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auto post_poll = std::chrono::steady_clock::now();
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for (const auto& pollfd : pollfds) {
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unsigned events = 0;
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if (pollfd.revents & POLLIN) {
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events |= FDE_READ;
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}
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if (pollfd.revents & POLLOUT) {
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events |= FDE_WRITE;
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}
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if (pollfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
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// We fake a read, as the rest of the code assumes that errors will
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// be detected at that point.
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events |= FDE_READ | FDE_ERROR;
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}
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#if defined(__linux__)
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if (pollfd.revents & POLLRDHUP) {
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events |= FDE_READ | FDE_ERROR;
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}
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#endif
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auto it = this->installed_fdevents_.find(pollfd.fd);
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CHECK(it != this->installed_fdevents_.end());
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fdevent* fde = &it->second;
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if (events == 0) {
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if (fde->timeout) {
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auto deadline = fde->last_active + *fde->timeout;
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if (deadline < post_poll) {
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events |= FDE_TIMEOUT;
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}
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}
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}
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if (events != 0) {
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D("%s got events %x", dump_fde(fde).c_str(), events);
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poll_events.push_back({fde, events});
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fde->last_active = post_poll;
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}
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}
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this->HandleEvents(poll_events);
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poll_events.clear();
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}
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main_thread_id_.reset();
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}
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size_t fdevent_context_poll::InstalledCount() {
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// We always have an installed fde for interrupt.
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return this->installed_fdevents_.size() - 1;
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}
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void fdevent_context_poll::Interrupt() {
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int rc = adb_write(this->interrupt_fd_, "", 1);
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// It's possible that we get EAGAIN here, if lots of notifications came in while handling.
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if (rc == 0) {
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PLOG(FATAL) << "fdevent interrupt fd was closed?";
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} else if (rc == -1 && errno != EAGAIN) {
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PLOG(FATAL) << "failed to write to fdevent interrupt fd";
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}
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}
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void fdevent_context_poll::Register(fdevent*) {}
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void fdevent_context_poll::Unregister(fdevent*) {}
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