ardupilot/libraries/AP_HAL_SITL/Util.cpp

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#include "Util.h"
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#include <sys/time.h>
#ifdef WITH_SITL_TONEALARM
HALSITL::ToneAlarm_SF HALSITL::Util::_toneAlarm;
#endif
uint64_t HALSITL::Util::get_hw_rtc() const
{
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#ifndef CLOCK_REALTIME
struct timeval ts;
gettimeofday(&ts, nullptr);
return ((long long)((ts.tv_sec * 1000000) + ts.tv_usec));
#else
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
const uint64_t seconds = ts.tv_sec;
const uint64_t nanoseconds = ts.tv_nsec;
return (seconds * 1000000ULL + nanoseconds/1000ULL);
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#endif
}
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/*
get a (hopefully unique) machine ID
*/
bool HALSITL::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, "sitl-unknown", len);
}
len = strnlen(cbuf, len);
return true;
}
/*
as get_system_id_unformatted will already be ascii, we use the same
ID here
*/
bool HALSITL::Util::get_system_id(char buf[40])
{
uint8_t len = 40;
return get_system_id_unformatted((uint8_t *)buf, len);
}
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#ifdef ENABLE_HEAP
void *HALSITL::Util::allocate_heap_memory(size_t size)
{
struct heap *new_heap = (struct heap*)malloc(sizeof(struct heap));
if (new_heap != nullptr) {
new_heap->scripting_max_heap_size = size;
new_heap->current_heap_usage = 0;
}
return (void *)new_heap;
}
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void *HALSITL::Util::heap_realloc(void *heap_ptr, void *ptr, size_t new_size)
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{
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if (heap_ptr == nullptr) {
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return nullptr;
}
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struct heap *heapp = (struct heap*)heap_ptr;
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// extract appropriate headers
size_t old_size = 0;
heap_allocation_header *old_header = nullptr;
if (ptr != nullptr) {
old_header = ((heap_allocation_header *)ptr) - 1;
old_size = old_header->allocation_size;
}
heapp->current_heap_usage -= old_size;
if (new_size == 0) {
free(old_header);
return nullptr;
}
if ((heapp->current_heap_usage + new_size - old_size) > heapp->scripting_max_heap_size) {
// fail the allocation as we don't have the memory. Note that we don't simulate fragmentation
return nullptr;
}
heap_allocation_header *new_header = (heap_allocation_header *)malloc(new_size + sizeof(heap_allocation_header));
if (new_header == nullptr) {
// total failure to allocate, this is very surprising in SITL
return nullptr;
}
heapp->current_heap_usage += new_size;
new_header->allocation_size = new_size;
void *new_mem = new_header + 1;
if (ptr == nullptr) {
return new_mem;
}
memcpy(new_mem, ptr, old_size > new_size ? new_size : old_size);
free(old_header);
return new_mem;
}
#endif // ENABLE_HEAP