blob: 9ec28b012188c367749203a8ffab19a35f3eda25 [file] [log] [blame]
/*
*
* Copyright (c) 2022 Project CHIP Authors
* All rights reserved.
*
* 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 "NamedPipeCommands.h"
#include <errno.h>
#include <fcntl.h>
#include <lib/support/CodeUtils.h>
#include <pthread.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
static constexpr const size_t kChipEventCmdBufSize = 256;
CHIP_ERROR NamedPipeCommands::Start(std::string & path, NamedPipeCommandDelegate * delegate)
{
VerifyOrReturnError(!mStarted, CHIP_NO_ERROR);
VerifyOrReturnError(delegate != nullptr, CHIP_ERROR_INVALID_ARGUMENT);
mStarted = true;
mDelegate = delegate;
mChipEventFifoPath = path;
// Creating the named file(FIFO)
VerifyOrReturnError((mkfifo(path.c_str(), 0666) == 0) || (errno == EEXIST), CHIP_ERROR_OPEN_FAILED);
VerifyOrReturnError(
pthread_create(&mChipEventCommandListener, nullptr, EventCommandListenerTask, reinterpret_cast<void *>(this)) == 0,
CHIP_ERROR_UNEXPECTED_EVENT);
return CHIP_NO_ERROR;
}
CHIP_ERROR NamedPipeCommands::Stop()
{
VerifyOrReturnError(mStarted, CHIP_NO_ERROR);
mStarted = false;
mDelegate = nullptr;
VerifyOrReturnError(pthread_cancel(mChipEventCommandListener) == 0, CHIP_ERROR_CANCELLED);
// Wait further for the thread to terminate if we had previously created it.
VerifyOrReturnError(pthread_join(mChipEventCommandListener, nullptr) == 0, CHIP_ERROR_SHUT_DOWN);
VerifyOrReturnError(unlink(mChipEventFifoPath.c_str()) == 0, CHIP_ERROR_WRITE_FAILED);
mChipEventFifoPath.clear();
return CHIP_NO_ERROR;
}
void * NamedPipeCommands::EventCommandListenerTask(void * arg)
{
char readbuf[kChipEventCmdBufSize];
NamedPipeCommands * self = reinterpret_cast<NamedPipeCommands *>(arg);
for (;;)
{
int fd = open(self->mChipEventFifoPath.c_str(), O_RDONLY);
if (fd == -1)
{
ChipLogError(NotSpecified, "Failed to open Event FIFO");
break;
}
ssize_t readBytes = read(fd, readbuf, kChipEventCmdBufSize);
readbuf[readBytes - 1] = '\0';
ChipLogProgress(NotSpecified, "Received payload: \"%s\"", readbuf);
// Process the received command request from event fifo
self->mDelegate->OnEventCommandReceived(readbuf);
close(fd);
}
return nullptr;
}