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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define TRACE_TAG FDEVENT
#include "sysdeps.h"
#include "fdevent_poll.h"
#include <fcntl.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <atomic>
#include <deque>
#include <functional>
#include <list>
#include <mutex>
#include <optional>
#include <unordered_map>
#include <utility>
#include <variant>
#include <vector>
#include <android-base/chrono_utils.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <android-base/threads.h>
#include "adb_io.h"
#include "adb_trace.h"
#include "adb_unique_fd.h"
#include "adb_utils.h"
#include "fdevent.h"
#include "sysdeps/chrono.h"
static void fdevent_interrupt(int fd, unsigned, void*) {
char buf[BUFSIZ];
ssize_t rc = TEMP_FAILURE_RETRY(adb_read(fd, buf, sizeof(buf)));
if (rc == -1) {
PLOG(FATAL) << "failed to read from fdevent interrupt fd";
}
}
fdevent_context_poll::fdevent_context_poll() {
int s[2];
if (adb_socketpair(s) != 0) {
PLOG(FATAL) << "failed to create fdevent interrupt socketpair";
}
if (!set_file_block_mode(s[0], false) || !set_file_block_mode(s[1], false)) {
PLOG(FATAL) << "failed to make fdevent interrupt socket nonblocking";
}
this->interrupt_fd_.reset(s[0]);
fdevent* fde = this->Create(unique_fd(s[1]), fdevent_interrupt, nullptr);
CHECK(fde != nullptr);
this->Add(fde, FDE_READ);
}
fdevent_context_poll::~fdevent_context_poll() {
// Destroy calls virtual methods, but this class is final, so that's okay.
this->Destroy(this->interrupt_fde_);
}
void fdevent_context_poll::Set(fdevent* fde, unsigned events) {
CheckMainThread();
fde->state = events;
D("fdevent_set: %s, events = %u", dump_fde(fde).c_str(), events);
}
static std::string dump_pollfds(const std::vector<adb_pollfd>& pollfds) {
std::string result;
for (const auto& pollfd : pollfds) {
std::string op;
if (pollfd.events & POLLIN) {
op += "R";
}
if (pollfd.events & POLLOUT) {
op += "W";
}
android::base::StringAppendF(&result, " %d(%s)", pollfd.fd, op.c_str());
}
return result;
}
void fdevent_context_poll::Loop() {
main_thread_id_ = android::base::GetThreadId();
while (true) {
if (terminate_loop_) {
break;
}
D("--- --- waiting for events");
std::vector<adb_pollfd> pollfds;
for (const auto& [fd, fde] : this->installed_fdevents_) {
adb_pollfd pfd;
pfd.fd = fd;
pfd.events = 0;
if (fde->state & FDE_READ) {
pfd.events |= POLLIN;
}
if (fde->state & FDE_WRITE) {
pfd.events |= POLLOUT;
}
if (fde->state & FDE_ERROR) {
pfd.events |= POLLERR;
}
#if defined(__linux__)
pfd.events |= POLLRDHUP;
#endif
pfd.revents = 0;
pollfds.push_back(pfd);
}
CHECK_GT(pollfds.size(), 0u);
D("poll(), pollfds = %s", dump_pollfds(pollfds).c_str());
std::optional<std::chrono::milliseconds> timeout = CalculatePollDuration();
int timeout_ms;
if (!timeout) {
timeout_ms = -1;
} else {
timeout_ms = timeout->count();
}
int ret = adb_poll(pollfds.data(), pollfds.size(), timeout_ms);
if (ret == -1) {
PLOG(ERROR) << "poll(), ret = " << ret;
return;
}
auto post_poll = std::chrono::steady_clock::now();
std::vector<fdevent_event> poll_events;
for (const auto& pollfd : pollfds) {
unsigned events = 0;
if (pollfd.revents & POLLIN) {
events |= FDE_READ;
}
if (pollfd.revents & POLLOUT) {
events |= FDE_WRITE;
}
if (pollfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
// We fake a read, as the rest of the code assumes that errors will
// be detected at that point.
events |= FDE_READ | FDE_ERROR;
}
#if defined(__linux__)
if (pollfd.revents & POLLRDHUP) {
events |= FDE_READ | FDE_ERROR;
}
#endif
auto it = this->installed_fdevents_.find(pollfd.fd);
CHECK(it != this->installed_fdevents_.end());
fdevent* fde = it->second;
if (events == 0) {
if (fde->timeout) {
auto deadline = fde->last_active + *fde->timeout;
if (deadline < post_poll) {
events |= FDE_TIMEOUT;
}
}
}
if (events != 0) {
D("%s got events %x", dump_fde(fde).c_str(), events);
poll_events.push_back({fde, events});
fde->last_active = post_poll;
}
}
this->HandleEvents(std::move(poll_events));
}
main_thread_id_.reset();
}
size_t fdevent_context_poll::InstalledCount() {
// We always have an installed fde for interrupt.
return this->installed_fdevents_.size() - 1;
}
void fdevent_context_poll::Interrupt() {
int rc = adb_write(this->interrupt_fd_, "", 1);
// It's possible that we get EAGAIN here, if lots of notifications came in while handling.
if (rc == 0) {
PLOG(FATAL) << "fdevent interrupt fd was closed?";
} else if (rc == -1 && errno != EAGAIN) {
PLOG(FATAL) << "failed to write to fdevent interrupt fd";
}
}
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