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#include "Instance.hpp"
#include "State.hpp"
#include "../helpers/Logger.hpp"
#include "../helpers/Nix.hpp"
#include <cstdlib>
#include <cstring>
#include <sys/poll.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <ranges>
#include <string_view>
#if defined(__linux__)
#include <sys/prctl.h>
#elif defined(__FreeBSD__)
#include <signal.h>
#include <sys/procctl.h>
#endif
#include <hyprutils/os/Process.hpp>
using namespace Hyprutils::OS;
using namespace std::string_literals;
//
void CHyprlandInstance::runHyprlandThread(bool safeMode) {
std::vector<std::string> argsStd;
argsStd.emplace_back("--watchdog-fd");
argsStd.emplace_back(std::format("{}", m_toHlPid.get()));
if (safeMode)
argsStd.emplace_back("--safe-mode");
for (const auto& a : g_state->rawArgvNoBinPath) {
argsStd.emplace_back(a);
}
// spawn a process manually. Hyprutils' Async is detached, while Sync redirects stdout
// TODO: make Sync respect fds?
std::vector<char*> args = {strdup(g_state->customPath.value_or("Hyprland").c_str())};
for (const auto& a : argsStd) {
args.emplace_back(strdup(a.c_str()));
}
args.emplace_back(nullptr);
int forkRet = fork();
if (forkRet == 0) {
// Make hyprland die on our SIGKILL
#if defined(__linux__)
prctl(PR_SET_PDEATHSIG, SIGKILL);
#elif defined(__FreeBSD__)
int sig = SIGKILL;
procctl(P_PID, getpid(), PROC_PDEATHSIG_CTL, &sig);
#endif
if (Nix::shouldUseNixGL()) {
argsStd.insert(argsStd.begin(), g_state->customPath.value_or("Hyprland"));
args.insert(args.begin(), strdup(argsStd.front().c_str()));
execvp("nixGL", args.data());
} else
execvp(g_state->customPath.value_or("Hyprland").c_str(), args.data());
g_logger->log(Hyprutils::CLI::LOG_ERR, "fork(): execvp failed: {}", strerror(errno));
std::fflush(stdout);
exit(1);
} else
m_hlPid = forkRet;
m_hlThread = std::thread([this] {
while (true) {
int status = 0;
int ret = waitpid(m_hlPid, &status, 0);
if (ret == -1) {
g_logger->log(Hyprutils::CLI::LOG_ERR, "Couldn't waitpid for hyprland: {}", strerror(errno));
break;
}
if (WIFEXITED(status))
break;
}
write(m_wakeupWrite.get(), "vax", 3);
std::fflush(stdout);
std::fflush(stderr);
});
}
void CHyprlandInstance::forceQuit() {
m_hyprlandExiting = true;
kill(m_hlPid, SIGTERM); // gracefully, can get stuck but it's unlikely
m_hlThread.join(); // needs this otherwise can crash
}
void CHyprlandInstance::clearFd(const Hyprutils::OS::CFileDescriptor& fd) {
static std::array<char, 1024> buf;
read(fd.get(), buf.data(), 1023);
}
void CHyprlandInstance::dispatchHyprlandEvent() {
std::string recvd = "";
static std::array<char, 4096> buf;
ssize_t n = read(m_fromHlPid.get(), buf.data(), 4096);
if (n < 0) {
g_logger->log(Hyprutils::CLI::LOG_ERR, "Failed dispatching hl events");
return;
}
recvd.append(buf.data(), n);
if (recvd.empty())
return;
for (const auto& s : std::views::split(recvd, '\n')) {
const std::string_view sv = std::string_view{s};
if (sv == "vax") {
// init passed
m_hyprlandInitialized = true;
continue;
}
if (sv == "end") {
// exiting
m_hyprlandExiting = true;
continue;
}
}
}
bool CHyprlandInstance::run(bool safeMode) {
int pipefds[2];
pipe(pipefds);
m_fromHlPid = CFileDescriptor{pipefds[0]};
m_toHlPid = CFileDescriptor{pipefds[1]};
pipe(pipefds);
m_wakeupRead = CFileDescriptor{pipefds[0]};
m_wakeupWrite = CFileDescriptor{pipefds[1]};
runHyprlandThread(safeMode);
pollfd pollfds[2] = {
{
.fd = m_wakeupRead.get(),
.events = POLLIN,
.revents = 0,
},
{
.fd = m_fromHlPid.get(),
.events = POLLIN,
.revents = 0,
},
};
while (true) {
int ret = poll(pollfds, 2, -1);
if (ret < 0) {
g_logger->log(Hyprutils::CLI::LOG_ERR, "poll() failed, exiting");
exit(1);
}
if (pollfds[1].revents & POLLIN) {
g_logger->log(Hyprutils::CLI::LOG_DEBUG, "got an event from hyprland");
dispatchHyprlandEvent();
continue;
}
if (pollfds[0].revents & POLLIN) {
g_logger->log(Hyprutils::CLI::LOG_DEBUG, "hyprland exit, breaking poll, checking state");
clearFd(m_wakeupRead);
break;
}
}
m_hlThread.join();
return !m_hyprlandInitialized || m_hyprlandExiting;
}
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