X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/0e1309c02f0703c050df09b71346dab60fc6df87..5ea8e2ba737f903db81d49b56778e883634512a5:/lunaix-os/kernel/demos/iotest.c

diff --git a/lunaix-os/kernel/demos/iotest.c b/lunaix-os/kernel/demos/iotest.c
index 5e17b02..0ebe696 100644
--- a/lunaix-os/kernel/demos/iotest.c
+++ b/lunaix-os/kernel/demos/iotest.c
@@ -15,11 +15,25 @@ _iotest_main()
     char test_sequence[] = "Once upon a time, in a magical land of Equestria. "
                            "There were two regal sisters who ruled together "
                            "and created harmony for all the land.";
+    char read_out[256];
+
+    // 切换工作目录至 /dev
+    int errno = chdir("/dev");
+    if (errno) {
+        write(STDOUT, "fail to chdir", 15);
+        return;
+    }
+
+    if (getcwd(read_out, sizeof(read_out))) {
+        write(STDOUT, "current working dir: ", 22);
+        write(STDOUT, read_out, 256);
+        write(STDOUT, "\n", 2);
+    }
 
     // sda 设备 - 硬盘
     //  sda设备属于容积设备（Volumetric Device），
     //  Lunaix会尽可能缓存任何对此设备的上层读写，并使用延迟写入策略。（FO_DIRECT可用于屏蔽该功能）
-    int fd = open("/dev/sda", 0);
+    int fd = open("./sda", 0);
 
     if (fd < 0) {
         kprintf(KERROR "fail to open (%d)\n", geterrno());
@@ -38,7 +52,6 @@ _iotest_main()
     lseek(fd, 4 * 4096, FSEEK_SET);
     write(fd, test_sequence, sizeof(test_sequence));
 
-    char read_out[256];
     write(STDOUT, "input: ", 8);
     int size = read(STDIN, read_out, 256);