internal: some minor fd/socket cleanups and make logging thread safe (#7123)

* bezier: dont loop on float values

Using a floating-point loop variable with a fixed increment can cause precision
errors over time due to the nature of floating-point arithmetic.
and cause undesired effects.

ex
iteration 1 = 0.10000000149011611938
iteration 2 = 0.20000000298023223877

eventually..

iteration 8 = 0.80000001192092895508
iteration 9 = 0.89999997615814208984

* hyprctl: close sockets on destruction

store socketpath and close the fd and unlink the socket path on exit.

* eventloopmgr: close the timerfd

close the timerfd on exit.

* debug: make logging thread safe

instead of opening and closing the logfile on each write open it on init
and close it on compositor exit. also add a mutex so accidently using
logging from a thread like the watchdog or similiar doesnt cause issues.

* xwl: clean up fd logic

check if the fd is actually opened before closing, and close the
pipesource FD on exit.

src/debug/HyprCtl.cpp

@@ -1604,6 +1604,10 @@ CHyprCtl::CHyprCtl() {
 CHyprCtl::~CHyprCtl() {
     if (m_eventSource)
         wl_event_source_remove(m_eventSource);
+    if (m_iSocketFD >= 0)
+        close(m_iSocketFD);
+    if (!m_socketPath.empty())
+        unlink(m_socketPath.c_str());
 }
 
 SP<SHyprCtlCommand> CHyprCtl::registerCommand(SHyprCtlCommand cmd) {
@@ -1821,9 +1825,9 @@ void CHyprCtl::startHyprCtlSocket() {
 
     sockaddr_un SERVERADDRESS = {.sun_family = AF_UNIX};
 
-    std::string socketPath = g_pCompositor->m_szInstancePath + "/.socket.sock";
+    m_socketPath = g_pCompositor->m_szInstancePath + "/.socket.sock";
 
-    strcpy(SERVERADDRESS.sun_path, socketPath.c_str());
+    strcpy(SERVERADDRESS.sun_path, m_socketPath.c_str());
 
     if (bind(m_iSocketFD, (sockaddr*)&SERVERADDRESS, SUN_LEN(&SERVERADDRESS)) < 0) {
         Debug::log(ERR, "Couldn't start the Hyprland Socket. (2) IPC will not work.");
@@ -1833,7 +1837,7 @@ void CHyprCtl::startHyprCtlSocket() {
     // 10 max queued.
     listen(m_iSocketFD, 10);
 
-    Debug::log(LOG, "Hypr socket started at {}", socketPath);
+    Debug::log(LOG, "Hypr socket started at {}", m_socketPath);
 
     m_eventSource = wl_event_loop_add_fd(g_pCompositor->m_sWLEventLoop, m_iSocketFD, WL_EVENT_READABLE, hyprCtlFDTick, nullptr);
 }

src/debug/HyprCtl.hpp

@@ -31,6 +31,7 @@ class CHyprCtl {
 
     std::vector<SP<SHyprCtlCommand>> m_vCommands;
     wl_event_source*                 m_eventSource = nullptr;
+    std::string                      m_socketPath;
 };
 
 inline std::unique_ptr<CHyprCtl> g_pHyprCtl;

src/debug/Log.cpp

@@ -8,6 +8,11 @@
 
 void Debug::init(const std::string& IS) {
     logFile = IS + (ISDEBUG ? "/hyprlandd.log" : "/hyprland.log");
+    logOfs.open(logFile, std::ios::out | std::ios::app);
+}
+
+void Debug::close() {
+    logOfs.close();
 }
 
 void Debug::log(LogLevel level, std::string str) {
@@ -55,11 +60,8 @@ void Debug::log(LogLevel level, std::string str) {
 
     if (!disableLogs || !**disableLogs) {
         // log to a file
-        std::ofstream ofs;
-        ofs.open(logFile, std::ios::out | std::ios::app);
-        ofs << str << "\n";
-
-        ofs.close();
+        logOfs << str << "\n";
+        logOfs.flush();
     }
 
     // log it to the stdout too.

src/debug/Log.hpp

@@ -4,6 +4,7 @@
 #include <iostream>
 #include <fstream>
 #include <chrono>
+#include <mutex>
 #include "../includes.hpp"
 #include "../helpers/MiscFunctions.hpp"
 
@@ -22,6 +23,7 @@ enum LogLevel {
 
 namespace Debug {
     inline std::string     logFile;
+    inline std::ofstream   logOfs;
     inline int64_t* const* disableLogs   = nullptr;
     inline int64_t* const* disableTime   = nullptr;
     inline bool            disableStdout = false;
@@ -30,14 +32,18 @@ namespace Debug {
     inline int64_t* const* coloredLogs   = nullptr;
 
     inline std::string     rollingLog = ""; // rolling log contains the ROLLING_LOG_SIZE tail of the log
+    inline std::mutex      logMutex;
 
     void                   init(const std::string& IS);
+    void                   close();
 
     //
     void log(LogLevel level, std::string str);
 
     template <typename... Args>
     void log(LogLevel level, std::format_string<Args...> fmt, Args&&... args) {
+        std::lock_guard<std::mutex> guard(logMutex);
+
         if (level == TRACE && !trace)
             return;
 
@@ -66,5 +72,6 @@ namespace Debug {
         logMsg += std::vformat(fmt.get(), std::make_format_args(args...));
 
         log(level, logMsg);
+        logMutex.unlock();
     }
 };