ardupilot/libraries/AP_HAL_SITL/system.cpp

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#include <stdarg.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <AP_HAL/AP_HAL.h>
#include <AP_HAL/system.h>
#include "Scheduler.h"
extern const AP_HAL::HAL& hal;
using HALSITL::Scheduler;
namespace AP_HAL {
static struct {
struct timeval start_time;
} state;
void init()
{
gettimeofday(&state.start_time, nullptr);
}
void panic(const char *errormsg, ...)
{
va_list ap;
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fflush(stdout);
va_start(ap, errormsg);
vprintf(errormsg, ap);
va_end(ap);
printf("\n");
dump_stack_trace();
if (getenv("SITL_PANIC_EXIT")) {
// this is used on the autotest server to prevent us waiting
// 10 hours for a timeout
exit(1);
}
for(;;);
}
// partly flogged from: https://github.com/tridge/junkcode/blob/master/segv_handler/segv_handler.c
void dump_stack_trace()
{
// find dumpstack command:
const char *dumpstack = "dumpstack"; // if we can't find it trust in PATH
struct stat statbuf;
const char *paths[] {
"Tools/scripts/dumpstack",
"APM/Tools/scripts/dumpstack", // for autotest server
};
for (uint8_t i=0; i<ARRAY_SIZE(paths); i++) {
if (::stat(paths[i], &statbuf) != -1) {
dumpstack = paths[i];
break;
}
}
char cmd[100];
char progname[100];
char *p;
int n;
n = readlink("/proc/self/exe", progname, sizeof(progname)-1);
if (n == -1) {
strncpy(progname, "unknown", sizeof(progname));
n = strlen(progname);
}
progname[n] = 0;
p = strrchr(progname, '/');
if (p != nullptr) {
*p = 0;
} else {
p = progname;
}
char output_filepath[30];
snprintf(output_filepath,
ARRAY_SIZE(output_filepath),
"segv_%s.%d.out",
p+1,
(int)getpid());
snprintf(cmd,
sizeof(cmd),
"sh %s %d >%s 2>&1",
dumpstack,
(int)getpid(),
output_filepath);
fprintf(stderr, "Running: %s\n", cmd);
if (system(cmd)) {
fprintf(stderr, "Failed\n");
return;
}
fprintf(stderr, "Stack dumped\n");
// print the trace on stderr:
int fd = open(output_filepath, O_RDONLY);
if (fd == -1) {
fprintf(stderr, "Failed to open stack dump filepath: %m");
return;
}
char buf[1024]; // let's hope we're not here because we ran out of stack
while (true) {
const ssize_t ret = read(fd, buf, ARRAY_SIZE(buf));
if (ret == -1) {
fprintf(stderr, "Read error: %m");
break;
}
if (ret == 0) {
break;
}
if (write(2, buf, ret) != ret) {
// *sigh*
break;
}
}
close(fd);
}
uint32_t micros()
{
return micros64() & 0xFFFFFFFF;
}
uint32_t millis()
{
return millis64() & 0xFFFFFFFF;
}
/*
we define a millis16() here to avoid an issue with sitl builds in cygwin
*/
uint16_t millis16()
{
return millis64() & 0xFFFF;
}
uint64_t micros64()
{
const HALSITL::Scheduler* scheduler = HALSITL::Scheduler::from(hal.scheduler);
uint64_t stopped_usec = scheduler->stopped_clock_usec();
if (stopped_usec) {
return stopped_usec;
}
struct timeval tp;
gettimeofday(&tp, nullptr);
uint64_t ret = 1.0e6 * ((tp.tv_sec + (tp.tv_usec * 1.0e-6)) -
(state.start_time.tv_sec +
(state.start_time.tv_usec * 1.0e-6)));
return ret;
}
uint64_t millis64()
{
const HALSITL::Scheduler* scheduler = HALSITL::Scheduler::from(hal.scheduler);
uint64_t stopped_usec = scheduler->stopped_clock_usec();
if (stopped_usec) {
return stopped_usec / 1000;
}
struct timeval tp;
gettimeofday(&tp, nullptr);
uint64_t ret = 1.0e3*((tp.tv_sec + (tp.tv_usec*1.0e-6)) -
(state.start_time.tv_sec +
(state.start_time.tv_usec*1.0e-6)));
return ret;
}
} // namespace AP_HAL