feat: Massive OS expansion with IPC, Sound & TTS, Block layer, FAT32/ext2/sysfs, Signals, Syscalls, Modules, Drivers & 50+ LazyBox applets

kernel/signal.c

@@ -0,0 +1,38 @@
+#include <kernel/signal.h>
+#include <kernel/printk.h>
+#include <lib/string.h>
+
+static sighandler_t signal_handlers[NSIG];
+static sigset_t pending_signals = 0;
+
+void signal_init(void) {
+    memset(signal_handlers, 0, sizeof(signal_handlers));
+    pending_signals = 0;
+    printk(KERN_INFO "SIGNAL: POSIX Signal subsystem initialized (32 signals)\n");
+}
+
+sighandler_t signal_set_handler(int signum, sighandler_t handler) {
+    if (signum <= 0 || signum >= NSIG) return SIG_ERR;
+    sighandler_t old = signal_handlers[signum];
+    signal_handlers[signum] = handler;
+    return old;
+}
+
+int signal_send(uint32_t pid, int signum) {
+    (void)pid;
+    if (signum <= 0 || signum >= NSIG) return -1;
+    pending_signals |= (1U << signum);
+    signal_deliver_pending();
+    return 0;
+}
+
+void signal_deliver_pending(void) {
+    for (int i = 1; i < NSIG; i++) {
+        if (pending_signals & (1U << i)) {
+            pending_signals &= ~(1U << i);
+            if (signal_handlers[i] && signal_handlers[i] != SIG_IGN && signal_handlers[i] != SIG_DFL) {
+                signal_handlers[i](i);
+            }
+        }
+    }
+}