实现pty，附带测试程序 (#685)

* 实现pty，附带测试程序

* fmt ** clippy

* 将file层的锁粒度缩小，从而不使用no_preempt。更改pipe在sleep部分的bug

* 修复拼写错误

user/apps/test_pty/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
+
+
+all:
+	$(CC) -static -o test_pty test_pty.c
+
+.PHONY: install clean
+install: all
+	mv test_pty $(DADK_CURRENT_BUILD_DIR)/test_pty
+
+clean:
+	rm test_pty *.o
+
+fmt:

user/apps/test_pty/test_pty.c

@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <termios.h>
+#include <pty.h>
+
+int main()
+{
+	int ptm, pts;
+	char name[256];
+	struct termios term;
+
+	if (openpty(&ptm, &pts, name, NULL, NULL) == -1) {
+		perror("openpty");
+		exit(EXIT_FAILURE);
+	}
+
+	printf("slave name: %s fd: %d\n", name,pts);
+
+	tcgetattr(pts, &term);
+	term.c_lflag &= ~(ICANON | ECHO);
+	term.c_cc[VMIN] = 1;
+	term.c_cc[VTIME] = 0;
+	tcsetattr(pts, TCSANOW, &term);
+	
+	printf("before print to pty slave\n");
+
+	dprintf(pts, "Hello world!\n");
+
+	char buf[256];
+	ssize_t n = read(ptm, buf, sizeof(buf));
+	if (n > 0) {
+		printf("read %ld bytes from slave: %.*s", n, (int)n, buf);
+	}
+
+	dprintf(ptm, "hello world from master\n");
+
+	char nbuf[256];
+	ssize_t nn = read(pts, nbuf, sizeof(nbuf));
+	if (nn > 0) {
+		printf("read %ld bytes from master: %.*s", nn, (int)nn, nbuf);
+	}
+
+	close(ptm);
+	close(pts);
+
+	return 0;
+}

user/dadk/config/test_pty-0.1.0.dadk

@@ -0,0 +1,23 @@
+{
+  "name": "test_pty",
+  "version": "0.1.0",
+  "description": "简单的pty测试程序",
+  "task_type": {
+    "BuildFromSource": {
+      "Local": {
+        "path": "apps/test_pty"
+      }
+    }
+  },
+  "depends": [],
+  "build": {
+    "build_command": "make install -j $(nproc)"
+  },
+  "install": {
+    "in_dragonos_path": "/bin"
+  },
+  "clean": {
+    "clean_command": "make clean"
+  },
+  "envs": []
+}