ardupilot/libraries/AP_HAL_Linux/Util.cpp

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#include <errno.h>
#include <fcntl.h>
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#include <stdarg.h>
#include <stdio.h>
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#include <stdlib.h>
#include <sys/stat.h>
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#include <time.h>
#include <unistd.h>
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#include <AP_HAL/AP_HAL.h>
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#include "Heat_Pwm.h"
#include "ToneAlarm_Disco.h"
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#include "Util.h"
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using namespace Linux;
extern const AP_HAL::HAL& hal;
#if CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_DISCO
ToneAlarm_Disco Util::_toneAlarm;
#else
ToneAlarm Util::_toneAlarm;
#endif
void Util::init(int argc, char * const *argv) {
saved_argc = argc;
saved_argv = argv;
#ifdef HAL_UTILS_HEAT
#if HAL_UTILS_HEAT == HAL_LINUX_HEAT_PWM
_heat = new Linux::HeatPwm(HAL_LINUX_HEAT_PWM_NUM,
HAL_LINUX_HEAT_KP,
HAL_LINUX_HEAT_KI,
HAL_LINUX_HEAT_PERIOD_NS);
#else
#error Unrecognized Heat
#endif // #if
#else
_heat = new Linux::Heat();
#endif // #ifdef
}
// set current IMU temperatue in degrees C
void Util::set_imu_temp(float current)
{
_heat->set_imu_temp(current);
}
// set target IMU temperatue in degrees C
void Util::set_imu_target_temp(int8_t *target)
{
_heat->set_imu_target_temp(target);
}
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/**
return commandline arguments, if available
*/
void Util::commandline_arguments(uint8_t &argc, char * const *&argv)
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{
argc = saved_argc;
argv = saved_argv;
}
void Util::set_hw_rtc(uint64_t time_utc_usec)
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{
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#if CONFIG_HAL_BOARD_SUBTYPE != HAL_BOARD_SUBTYPE_LINUX_NONE
// call superclass method to set time. We've guarded this so we
// don't reset the HW clock time on people's laptops.
AP_HAL::Util::set_hw_rtc(time_utc_usec);
#endif
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}
bool Util::is_chardev_node(const char *path)
{
struct stat st;
if (!path || lstat(path, &st) < 0) {
return false;
}
return S_ISCHR(st.st_mode);
}
/*
always report 256k of free memory. Using mallinfo() isn't useful as
it only reported the current heap, which auto-expands. What we're
trying to do here is ensure that code which checks for free memory
before allocating objects does allow the allocation
*/
uint32_t Util::available_memory(void)
{
return 256*1024;
}
#ifndef HAL_LINUX_DEFAULT_SYSTEM_ID
#define HAL_LINUX_DEFAULT_SYSTEM_ID "linux-unknown"
#endif
/*
get a (hopefully unique) machine ID
*/
bool Util::get_system_id_unformatted(uint8_t buf[], uint8_t &len)
{
char *cbuf = (char *)buf;
// try first to use machine-id file. Most systems will have this
const char *paths[] = { "/etc/machine-id", "/var/lib/dbus/machine-id" };
for (uint8_t i=0; i<ARRAY_SIZE(paths); i++) {
int fd = open(paths[i], O_RDONLY);
if (fd == -1) {
continue;
}
ssize_t ret = read(fd, buf, len);
close(fd);
if (ret <= 0) {
continue;
}
len = ret;
char *p = strchr(cbuf, '\n');
if (p) {
*p = 0;
}
len = strnlen(cbuf, len);
return true;
}
// fallback to hostname
if (gethostname(cbuf, len) != 0) {
// use a default name so this always succeeds. Without it we can't
// implement some features (such as UAVCAN)
strncpy(cbuf, HAL_LINUX_DEFAULT_SYSTEM_ID, len);
}
len = strnlen(cbuf, len);
return true;
}
/*
as get_system_id_unformatted will already be ascii, we use the same
ID here
*/
bool Util::get_system_id(char buf[40])
{
uint8_t len = 40;
return get_system_id_unformatted((uint8_t *)buf, len);
}
int Util::write_file(const char *path, const char *fmt, ...)
{
errno = 0;
int fd = open(path, O_WRONLY | O_CLOEXEC);
if (fd == -1) {
return -errno;
}
va_list args;
va_start(args, fmt);
int ret = vdprintf(fd, fmt, args);
int errno_bkp = errno;
close(fd);
va_end(args);
if (ret < 1) {
return -errno_bkp;
}
return ret;
}
int Util::read_file(const char *path, const char *fmt, ...)
{
errno = 0;
FILE *file = fopen(path, "re");
if (!file) {
return -errno;
}
va_list args;
va_start(args, fmt);
int ret = vfscanf(file, fmt, args);
int errno_bkp = errno;
fclose(file);
va_end(args);
if (ret < 1) {
return -errno_bkp;
}
return ret;
}
const char *Linux::Util::_hw_names[UTIL_NUM_HARDWARES] = {
[UTIL_HARDWARE_RPI1] = "BCM2708",
[UTIL_HARDWARE_RPI2] = "BCM2709",
[UTIL_HARDWARE_BEBOP] = "Mykonos3 board",
[UTIL_HARDWARE_BEBOP2] = "Milos board",
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[UTIL_HARDWARE_DISCO] = "Evinrude board",
};
#define MAX_SIZE_LINE 50
int Util::get_hw_arm32()
{
char buffer[MAX_SIZE_LINE] = { 0 };
FILE *f = fopen("/proc/cpuinfo", "r");
if (f == nullptr) {
return -errno;
}
while (fgets(buffer, MAX_SIZE_LINE, f) != nullptr) {
if (strstr(buffer, "Hardware") == nullptr) {
continue;
}
for (uint8_t i = 0; i < UTIL_NUM_HARDWARES; i++) {
if (strstr(buffer, _hw_names[i]) == nullptr) {
continue;
}
fclose(f);
return i;
}
}
fclose(f);
return -ENOENT;
}