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#include <signal.h>

#include <sys/time.h>

#include <string>

#include <sstream>

#include <iostream>

#include "cpu_profiler.h"

using namespace std;

void SignalHandler(int signum, siginfo_t *info, void *context) {

if (info->si_code <= 0) {

return;

}

Agent::instance.cpu_profiler->HandleSignal(context);

}

bool CPUProfiler::SetupProfiler() {

if (!profile_recorder->sample_index.is_lock_free()) {

Agent::instance.LogInfo("Lock-free atomics not available.");

return false;

}

struct sigaction sa;

sigemptyset(&sa.sa_mask);

sa.sa_handler = NULL;

sa.sa_sigaction = SignalHandler;

sa.sa_flags = SA_RESTART | SA_SIGINFO;

if (sigaction(SIGPROF, &sa, NULL) < 0) {

Agent::instance.LogInfo("Signal handler setup failed.");

return false;

}

return true;

}

void CPUProfiler::DestroyProfiler() {

SetSamplingRate(0);

struct sigaction sa;

sigemptyset(&sa.sa_mask);

sa.sa_handler = SIG_DFL;

sigaction(SIGPROF, &sa, NULL);

}

void CPUProfiler::StartProfiler() {

profile_recorder->Reset();

SetSamplingRate(sampling_rate);

}

void CPUProfiler::StopProfiler() {

SetSamplingRate(0);

}

void CPUProfiler::SetSamplingRate(long rate) {

static struct itimerval timer;

timer.it_interval.tv_sec = 0;

timer.it_interval.tv_usec = rate;

timer.it_value = timer.it_interval;

if (setitimer(ITIMER_PROF, &timer, 0) == -1) {

ostringstream msg;

msg << "setitimer failed with error " << errno;

Agent::instance.LogError(msg.str());

return;

}

void CPUProfiler::HandleSignal(void* context) {

profile_recorder->RecordSample(0, context);

}

extern "C" JNIEXPORT jboolean JNICALL Java_com_stackimpact_agent_profilers_CPUProfiler_setupCPUProfiler(JNIEnv* env, jobject unused, jlong sampling_rate) {

Agent* agent = &Agent::instance;

agent->cpu_profiler->sampling_rate = (long)sampling_rate;

return agent->cpu_profiler->SetupProfiler();

}

extern "C" JNIEXPORT void JNICALL Java_com_stackimpact_agent_profilers_CPUProfiler_destroyCPUProfiler(JNIEnv* env, jobject unused) {

Agent* agent = &Agent::instance;

agent->cpu_profiler->DestroyProfiler();

}

extern "C" JNIEXPORT void JNICALL Java_com_stackimpact_agent_profilers_CPUProfiler_startCPUProfiler(JNIEnv* env, jobject unused) {

Agent* agent = &Agent::instance;

agent->cpu_profiler->StartProfiler();

}

extern "C" JNIEXPORT jobjectArray JNICALL Java_com_stackimpact_agent_profilers_CPUProfiler_stopCPUProfiler(JNIEnv* env, jobject unused) {

Agent* agent = &Agent::instance;

agent->cpu_profiler->StopProfiler();

return agent->cpu_profiler->profile_recorder->ExportProfile(env);

}

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