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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>
#include <type_traits>
// #define PERF_PRINT_ON 1
#include <jau/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) noexcept
{
static_assert( sizeof(struct sockaddr) > sizeof(sockaddr_hci), "Requirement sizeof(struct sockaddr) > sizeof(sockaddr_hci)" );
sockaddr addr_holder; // sizeof(struct sockaddr) > sizeof(sockaddr_hci), silent valgrind.
sockaddr_hci * ptr_hci_addr = (sockaddr_hci*)&addr_holder;
int fd, 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
fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
if (0 > fd ) {
ERR_PRINT("HCIComm::hci_open_dev: socket failed");
return fd;
}
// Bind socket to the HCI device
bzero(&addr_holder, sizeof(addr_holder));
ptr_hci_addr->hci_family = AF_BLUETOOTH;
ptr_hci_addr->hci_dev = dev_id;
ptr_hci_addr->hci_channel = channel;
if (bind(fd, &addr_holder, sizeof(sockaddr_hci)) < 0) {
ERR_PRINT("hci_open_dev: bind failed");
goto failed;
}
return fd;
failed:
err = errno;
::close(fd);
errno = err;
return -1;
}
int HCIComm::hci_close_dev(int dd) noexcept
{
return ::close(dd);
}
// *************************************************
// *************************************************
// *************************************************
HCIComm::HCIComm(const uint16_t _dev_id, const uint16_t _channel) noexcept
: dev_id( _dev_id ), channel( _channel ),
socket_descriptor( hci_open_dev(_dev_id, _channel) ), interrupt_flag(false), tid_read(0)
{
}
void HCIComm::close() noexcept {
const std::lock_guard<std::recursive_mutex> lock(mtx_write); // RAII-style acquire and relinquish via destructor
if( 0 > socket_descriptor ) {
DBG_PRINT("HCIComm::close: Not opened: dd %d", socket_descriptor.load());
return;
}
DBG_PRINT("HCIComm::close: Start: dd %d", socket_descriptor.load());
PERF_TS_T0();
// interrupt ::read(..) and , avoiding prolonged hang
interrupt_flag = true;
{
pthread_t _tid_read = tid_read;
tid_read = 0;
if( 0 != _tid_read ) {
pthread_t tid_self = pthread_self();
if( tid_self != _tid_read ) {
int kerr;
if( 0 != ( kerr = pthread_kill(_tid_read, SIGALRM) ) ) {
ERR_PRINT("HCIComm::close: pthread_kill read %p FAILED: %d", (void*)_tid_read, kerr);
}
}
}
}
hci_close_dev(socket_descriptor);
socket_descriptor = -1;
interrupt_flag = false;
PERF_TS_TD("HCIComm::close");
DBG_PRINT("HCIComm::close: End: dd %d", socket_descriptor.load());
}
jau::snsize_t HCIComm::read(uint8_t* buffer, const jau::nsize_t capacity, const int32_t timeoutMS) noexcept {
jau::snsize_t len = 0;
if( 0 > socket_descriptor ) {
goto errout;
}
if( 0 == capacity ) {
goto done;
}
if( timeoutMS ) {
struct pollfd p;
int n;
p.fd = socket_descriptor; p.events = POLLIN;
while ( !interrupt_flag && (n = poll(&p, 1, timeoutMS)) < 0 ) {
if ( !interrupt_flag && ( errno == EAGAIN || errno == EINTR ) ) {
// cont temp unavail or interruption
continue;
}
goto errout;
}
if (!n) {
errno = ETIMEDOUT;
goto errout;
}
}
while ((len = ::read(socket_descriptor, buffer, capacity)) < 0) {
if (errno == EAGAIN || errno == EINTR ) {
// cont temp unavail or interruption
continue;
}
goto errout;
}
done:
return len;
errout:
return -1;
}
jau::snsize_t HCIComm::write(const uint8_t* buffer, const jau::nsize_t size) noexcept {
const std::lock_guard<std::recursive_mutex> lock(mtx_write); // RAII-style acquire and relinquish via destructor
jau::snsize_t len = 0;
if( 0 > socket_descriptor ) {
goto errout;
}
if( 0 == size ) {
goto done;
}
while( ( len = ::write(socket_descriptor, buffer, size) ) < 0 ) {
if( EAGAIN == errno || EINTR == errno ) {
continue;
}
goto errout;
}
done:
return len;
errout:
return -1;
}
} /* namespace direct_bt */
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