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/*
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 2020 Gothel Software e.K.
* Copyright (c) 2020 ZAFENA AB
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <cstring>
#include <string>
#include <memory>
#include <cstdint>
#include <vector>
#include <cstdio>
#include <algorithm>
// #define VERBOSE_ON 1
#include <dbt_debug.hpp>
#include "HCIComm.hpp"
extern "C" {
#include <inttypes.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/uio.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <poll.h>
}
namespace direct_bt {
int HCIComm::hci_open_dev(const uint16_t dev_id, const uint16_t channel)
{
sockaddr_hci a;
int dd, err;
/**
* dev_id is unsigned and hence always >= 0
if ( 0 > dev_id ) {
errno = ENODEV;
ERR_PRINT("hci_open_dev: invalid dev_id");
return -1;
} */
// Create a loose HCI socket
dd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
if (0 > dd ) {
ERR_PRINT("HCIComm::hci_open_dev: socket failed");
return dd;
}
// Bind socket to the HCI device
bzero((void *)&a, sizeof(a));
a.hci_family = AF_BLUETOOTH;
a.hci_dev = dev_id;
a.hci_channel = channel;
if (bind(dd, (struct sockaddr *) &a, sizeof(a)) < 0) {
ERR_PRINT("hci_open_dev: bind failed");
goto failed;
}
return dd;
failed:
err = errno;
::close(dd);
errno = err;
return -1;
}
int HCIComm::hci_close_dev(int dd)
{
return ::close(dd);
}
void HCIComm::close() {
const std::lock_guard<std::recursive_mutex> lock(mtx); // RAII-style acquire and relinquish via destructor
if( 0 > _dd ) {
return;
}
hci_close_dev(_dd);
_dd = -1;
}
int HCIComm::read(uint8_t* buffer, const int capacity) {
return read(buffer, capacity, timeoutMS);
}
int HCIComm::read(uint8_t* buffer, const int capacity, const int timeoutMS) {
int len = 0;
if( 0 > _dd || 0 > capacity ) {
goto errout;
}
if( 0 == capacity ) {
goto done;
}
if( timeoutMS ) {
struct pollfd p;
int n;
p.fd = _dd; p.events = POLLIN;
#if 0
sigset_t sigmask;
sigemptyset(&sigmask);
// sigaddset(&sigmask, SIGALRM);
struct timespec timeout_ts;
timeout_ts.tv_sec=0;
timeout_ts.tv_nsec=(long)timeoutMS*1000000L;
while ((n = ppoll(&p, 1, &timeout_ts, &sigmask)) < 0) {
#else
while ((n = poll(&p, 1, timeoutMS)) < 0) {
#endif
if (errno == EAGAIN || errno == EINTR ) {
// cont temp unavail or interruption
continue;
}
goto errout;
}
if (!n) {
errno = ETIMEDOUT;
goto errout;
}
}
while ((len = ::read(_dd, buffer, capacity)) < 0) {
if (errno == EAGAIN || errno == EINTR ) {
// cont temp unavail or interruption
continue;
}
goto errout;
}
done:
return len;
errout:
return -1;
}
int HCIComm::write(const uint8_t* buffer, const int size) {
int len = 0;
if( 0 > _dd || 0 > size ) {
goto errout;
}
if( 0 == size ) {
goto done;
}
while( ( len = ::write(_dd, buffer, size) ) < 0 ) {
if( EAGAIN == errno || EINTR == errno ) {
continue;
}
goto errout;
}
done:
return len;
errout:
return -1;
}
} /* namespace direct_bt */
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