feat(tty): 实现发送SIGINT终止信号 (#952)

* 实现SIGINT终止信号传递

* 添加test_sigint测试程序

user/apps/test_sigint/.gitignore

@@ -0,0 +1 @@
+test_sigint

user/apps/test_sigint/Makefile

@@ -0,0 +1,20 @@
+ifeq ($(ARCH), x86_64)
+	CROSS_COMPILE=x86_64-linux-musl-
+else ifeq ($(ARCH), riscv64)
+	CROSS_COMPILE=riscv64-linux-musl-
+endif
+
+CC=$(CROSS_COMPILE)gcc
+
+.PHONY: all
+all: main.c
+	$(CC) -static -o test_sigint main.c
+
+.PHONY: install clean
+install: all
+	mv test_sigint $(DADK_CURRENT_BUILD_DIR)/test_sigint
+
+clean:
+	rm test_sigint *.o
+
+fmt:

user/apps/test_sigint/main.c

@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <signal.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+// 信号处理函数
+void handle_signal(int signal)
+{
+    if (signal == SIGINT)
+    {
+        printf("Caught SIGINT (Ctrl+C). Exiting gracefully...\n");
+        exit(0); // 终止程序
+    }
+}
+
+int main()
+{
+    // 注册信号处理函数
+    signal(SIGINT, handle_signal);
+
+    // 模拟一个长时间运行的进程
+    while (1)
+    {
+        printf("Running... Press Ctrl+C to stop.\n");
+        sleep(5);
+    }
+
+    return 0;
+}