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/*
* Copyright (C) 2017 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.
*/
#include <signal.h>
#include <unistd.h>
#include <string>
#include <vector>
#include <android-base/strings.h>
#include <gflags/gflags.h>
#include <glog/logging.h>
#include <common/libs/fs/shared_fd.h>
#include <common/libs/fs/shared_select.h>
#include <host/libs/config/cuttlefish_config.h>
#include "host/commands/kernel_log_monitor/kernel_log_server.h"
DEFINE_int32(log_pipe_fd, -1,
"A file descriptor representing a (UNIX) socket from which to "
"read the logs. If -1 is given the socket is created according to "
"the instance configuration");
DEFINE_string(subscriber_fds, "",
"A comma separated list of file descriptors (most likely pipes) to"
" send boot events to.");
std::vector<cvd::SharedFD> SubscribersFromCmdline() {
// Validate the parameter
std::string fd_list = FLAGS_subscriber_fds;
for (auto c: fd_list) {
if (c != ',' && (c < '0' || c > '9')) {
LOG(ERROR) << "Invalid file descriptor list: " << fd_list;
std::exit(1);
}
}
auto fds = android::base::Split(FLAGS_subscriber_fds, ",");
std::vector<cvd::SharedFD> shared_fds;
for (auto& fd_str: fds) {
auto fd = std::stoi(fd_str);
auto shared_fd = cvd::SharedFD::Dup(fd);
close(fd);
shared_fds.push_back(shared_fd);
}
return shared_fds;
}
int main(int argc, char** argv) {
::android::base::InitLogging(argv, android::base::StderrLogger);
google::ParseCommandLineFlags(&argc, &argv, true);
auto subscriber_fds = SubscribersFromCmdline();
// Disable default handling of SIGPIPE
struct sigaction new_action {
}, old_action{};
new_action.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &new_action, &old_action);
auto config = vsoc::CuttlefishConfig::Get();
if (!config) {
LOG(ERROR) << "Unable to get config object";
return 1;
}
cvd::SharedFD pipe;
if (FLAGS_log_pipe_fd < 0) {
auto log_name = config->kernel_log_pipe_name();
pipe = cvd::SharedFD::Open(log_name.c_str(), O_RDONLY);
} else {
pipe = cvd::SharedFD::Dup(FLAGS_log_pipe_fd);
close(FLAGS_log_pipe_fd);
}
if (!pipe->IsOpen()) {
LOG(ERROR) << "Error opening log pipe: " << pipe->StrError();
return 2;
}
monitor::KernelLogServer klog{pipe, config->PerInstancePath("kernel.log"),
config->deprecated_boot_completed()};
for (auto subscriber_fd: subscriber_fds) {
if (subscriber_fd->IsOpen()) {
klog.SubscribeToBootEvents([subscriber_fd](monitor::BootEvent evt) {
int retval = subscriber_fd->Write(&evt, sizeof(evt));
if (retval < 0) {
if (subscriber_fd->GetErrno() != EPIPE) {
LOG(ERROR) << "Error while writing to pipe: "
<< subscriber_fd->StrError();
}
subscriber_fd->Close();
return monitor::SubscriptionAction::CancelSubscription;
}
return monitor::SubscriptionAction::ContinueSubscription;
});
} else {
LOG(ERROR) << "Subscriber fd isn't valid: " << subscriber_fd->StrError();
// Don't return here, we still need to write the logs to a file
}
}
for (;;) {
cvd::SharedFDSet fd_read;
fd_read.Zero();
klog.BeforeSelect(&fd_read);
int ret = cvd::Select(&fd_read, nullptr, nullptr, nullptr);
if (ret <= 0) continue;
klog.AfterSelect(fd_read);
}
return 0;
}
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