Fixed compile warnings - handled write() return values and removed unused variable

VERSION

@@ -1 +1 @@
-0.1.30
+0.1.31

event_miner.c

@@ -56,8 +56,6 @@ struct main_context {
     pthread_mutex_t result_mutex;
 };
 
-// Global reference to main context for signal handler (unused but kept for future use)
-static main_context_t* g_main_context = NULL;
 
 // Mining context for workers (keeping legacy fields for now during transition)
 struct mining_context {
@@ -110,7 +108,7 @@ static void cleanup_context(mining_context_t* ctx);
 // Signal handling and debugging functions
 static void signal_handler(int sig);
 static void install_signal_handlers(void);
-static void log_thread_exit(int thread_id, void* exit_status, const char* reason);
+static void log_thread_exit(int thread_id, void* exit_status, const char* reason, int verbose);
 static const char* get_signal_name(int sig);
 static void emergency_shutdown(void);
 
@@ -282,7 +280,11 @@ static const char* get_signal_name(int sig) {
     }
 }
 
-static void log_thread_exit(int thread_id, void* exit_status, const char* reason) {
+static void log_thread_exit(int thread_id, void* exit_status, const char* reason, int verbose) {
+    if (!verbose) {
+        return;
+    }
+    
     time_t current_time = time(NULL);
     struct tm* local_time = localtime(&current_time);
     
@@ -319,14 +321,14 @@ static void signal_handler(int sig) {
     // Log the signal (async-signal-safe functions only)
     const char* sig_name = get_signal_name(sig);
     
-    // Write to stderr using async-signal-safe functions
+    // Write to stderr using async-signal-safe functions (ignore return values in signal handler)
-    write(STDERR_FILENO, "\n[SIGNAL] Received ", 19);
+    (void)write(STDERR_FILENO, "\n[SIGNAL] Received ", 19);
-    write(STDERR_FILENO, sig_name, strlen(sig_name));
+    (void)write(STDERR_FILENO, sig_name, strlen(sig_name));
-    write(STDERR_FILENO, "\n", 1);
+    (void)write(STDERR_FILENO, "\n", 1);
     
     // For fatal signals, try emergency shutdown
     if (sig == SIGSEGV || sig == SIGABRT || sig == SIGFPE || sig == SIGBUS) {
-        write(STDERR_FILENO, "[SIGNAL] Attempting emergency shutdown...\n", 42);
+        (void)write(STDERR_FILENO, "[SIGNAL] Attempting emergency shutdown...\n", 42);
         emergency_shutdown();
         
         // Reset signal handler to default and re-raise
@@ -334,7 +336,7 @@ static void signal_handler(int sig) {
         raise(sig);
     } else if (sig == SIGINT || sig == SIGTERM) {
         // Graceful shutdown for interrupt signals
-        write(STDERR_FILENO, "[SIGNAL] Initiating graceful shutdown...\n", 41);
+        (void)write(STDERR_FILENO, "[SIGNAL] Initiating graceful shutdown...\n", 41);
         emergency_shutdown();
     }
     
@@ -416,7 +418,7 @@ static void* miner_thread(void* arg) {
     // Create a copy of the event for this thread
     char* event_str = cJSON_Print(ctx->event);
     if (!event_str) {
-        log_thread_exit(ctx->thread_id, exit_status, "JSON serialization failed");
+        log_thread_exit(ctx->thread_id, exit_status, "JSON serialization failed", ctx->verbose_enabled);
         return exit_status;
     }
     
@@ -424,7 +426,7 @@ static void* miner_thread(void* arg) {
     free(event_str);
     
     if (!local_event) {
-        log_thread_exit(ctx->thread_id, exit_status, "Event parsing failed");
+        log_thread_exit(ctx->thread_id, exit_status, "Event parsing failed", ctx->verbose_enabled);
         return exit_status;
     }
     
@@ -450,14 +452,14 @@ static void* miner_thread(void* arg) {
                 ctx->solution_callback(local_event, ctx);
             }
             exit_status = (void*)(intptr_t)THREAD_EXIT_SUCCESS;
-            log_thread_exit(ctx->thread_id, exit_status, "Solution found");
+            log_thread_exit(ctx->thread_id, exit_status, "Solution found", ctx->verbose_enabled);
             break;  // Exit after reporting solution
         }
         
         // Check for emergency shutdown
         if (g_shutdown_requested) {
             exit_status = (void*)(intptr_t)THREAD_EXIT_STOPPED;
-            log_thread_exit(ctx->thread_id, exit_status, "Emergency shutdown");
+            log_thread_exit(ctx->thread_id, exit_status, "Emergency shutdown", ctx->verbose_enabled);
             break;
         }
         
@@ -468,7 +470,7 @@ static void* miner_thread(void* arg) {
     // Normal stop by main thread
     if (ctx->should_stop && !g_shutdown_requested) {
         exit_status = (void*)(intptr_t)THREAD_EXIT_STOPPED;
-        log_thread_exit(ctx->thread_id, exit_status, "Stopped by main thread");
+        log_thread_exit(ctx->thread_id, exit_status, "Stopped by main thread", ctx->verbose_enabled);
     }
     
     cJSON_Delete(local_event);
@@ -542,7 +544,7 @@ static int mine_event(mining_context_t* ctx) {
             for (int j = 0; j < i; j++) {
                 void* exit_status;
                 pthread_join(threads[j], &exit_status);
-                log_thread_exit(j, exit_status, "Cleanup after creation failure");
+                log_thread_exit(j, exit_status, "Cleanup after creation failure", ctx->verbose_enabled);
             }
             free(threads);
             free(worker_contexts);
@@ -598,7 +600,7 @@ static int mine_event(mining_context_t* ctx) {
         // Log exit status if it wasn't already logged by the thread
         long status_code = (long)exit_status;
         if (status_code == THREAD_EXIT_ERROR) {
-            log_thread_exit(i, exit_status, "Thread error (not previously logged)");
+            log_thread_exit(i, exit_status, "Thread error (not previously logged)", ctx->verbose_enabled);
         }
     }