diff --git a/getcwd.c b/getcwd.c
new file mode 100644
index 0000000..11c73be
--- /dev/null
+++ b/getcwd.c
@@ -0,0 +1,145 @@
+#define __LIBRARY__
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <fcntl.h>
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <asm/segment.h>
+#include <sys/stat.h>
+
+#define BUF_MAX  128
+#define	DIRBUF  8192
+#define NAME_MAX  14
+
+struct dirent {                            /* Ŀ¼��ṹ�� */
+	long           d_ino;                  /* i�ڵ� */
+	off_t          d_off;                  /* � */
+	unsigned short d_reclen;               /* �ļ������� */
+	char           d_name[NAME_MAX + 1];   /* �ļ��� */
+};
+
+typedef struct
+{
+	int	dd_fd;			/* �ļ������� */
+	int	dd_loc;			/* ����ƫ�� */
+	int	dd_size;		/* ��Ч���ݴ�С */
+	char* dd_buf;		/* -> directory block */
+}	DIR;			    /* Ŀ¼�� */
+
+struct direct {
+	ino_t d_ino;
+	char d_name[NAME_MAX];
+};
+
+static struct dirent result;
+
+_syscall3(int, read, int, fildes, char*, buf, off_t, count)
+_syscall2(int, fstat, int, fildes, struct stat*, stat_buf)
+_syscall2(int, stat, const char*, filename, struct stat*, stat_buf)
+_syscall1(int, chdir, const char*, filename)
+
+struct dirent* readdir(DIR* dir)              /* ���ز���dirĿ¼�����¸�Ŀ¼����� */
+{                                             /* ��ȡ��Ŀ¼��Ϣ�����ptrָ���Ŀ¼�ṹ���У�ֻ��i�ڵ��Ŀ¼�� */
+	struct direct* ptr;                       /* ��ȡ��ǰĿ¼��ͬʱ��ȡ���¸�Ŀ¼����Ϣ�������result�� */
+											  /* ����ĩβ���������NULL */
+	if (!dir) {
+		errno = EBADF;
+		return NULL;
+	}
+	if (!dir->dd_buf)
+		if (!(dir->dd_buf = malloc(DIRBUF)))
+			return NULL;
+		else
+			dir->dd_size = dir->dd_loc = 0;
+	while (1) {
+		if (dir->dd_size <= dir->dd_loc) {
+			dir->dd_loc = 0;
+			dir->dd_size = read(dir->dd_fd, dir->dd_buf, DIRBUF);
+		}
+		if (dir->dd_size <= 0)
+			return NULL;
+		ptr = (struct direct*)(dir->dd_loc + dir->dd_buf);
+		dir->dd_loc += sizeof(*ptr);
+		if (!ptr->d_ino)
+			continue;
+		result.d_ino = ptr->d_ino;
+		strncpy(result.d_name, ptr->d_name, NAME_MAX);
+		result.d_name[NAME_MAX] = 0;
+		result.d_reclen = strlen(result.d_name);
+		return &result;
+	}
+}
+
+int closedir(DIR* dir)        /* �رղ���dir��ָ���Ŀ¼�� */
+{
+	int fd;
+
+	if (!dir) {
+		errno = EBADF;
+		return -1;
+	}
+	fd = dir->dd_fd;
+	free(dir->dd_buf);
+	free(dir);
+	return close(fd);
+}
+
+DIR* opendir(const char* dirname)         /* �򿪲���dirnameָ����Ŀ¼��������DIR��̬��Ŀ¼����ʧ�ܷ���NULL */
+{
+	int fd;
+	struct stat stat_buf;
+	DIR* ptr;
+
+	if ((fd = open(dirname, O_RDONLY)) < 0)  /* ִ��ϵͳ����read����ȡ�ļ������� */
+		return NULL;
+	if (fstat(fd, &stat_buf) < 0 ||          /* ִ��ϵͳ����fstat��ͨ���ļ���������ȡ�ļ�״̬��Ϣ�����뻺����stat_buf */
+		!S_ISDIR(stat_buf.st_mode) ||
+		!(ptr = malloc(sizeof(*ptr)))) {
+		close(fd);
+		return NULL;
+	}
+	memset(ptr, 0, sizeof(*ptr));
+	ptr->dd_fd = fd;
+	return ptr;
+}
+
+char* sys_getcwd(char* buf, size_t size) {
+	char through_name[BUF_MAX], cwd[BUF_MAX];
+	DIR* pre_fstream;
+	struct dirent* through_stream;
+	struct stat current_direct_state, through_state, pre_direct_state;
+	dev_t current_direct_dev;
+	ino_t current_direct_inum;
+
+	while (1) {
+		if (stat(".", &current_direct_state == 0)) {            /* ��ȡ��ǰĿ¼���ļ�״̬��Ϣ */
+			current_direct_dev = current_direct_state.st_dev;
+			current_direct_inum = current_direct_state.st_ino;
+		}
+
+		pre_fstream = opendir("..");                            /* ��ȡ��ǰĿ¼�ĸ�Ŀ¼���ļ��� */
+		stat("..", &pre_direct_state);                          /* ��ȡ��ǰĿ¼�ĸ�Ŀ¼���ļ���Ϣ */
+		if (pre_direct_state.st_dev == current_direct_dev && pre_direct_state.st_ino == current_direct_inum)
+			break;                                              /* �����Ŀ¼�͵�ǰĿ¼��ͬ��˵���Ѿ����˸�Ŀ¼����ʱ�˳�ѭ�� */
+
+		while ((through_stream = readdir(pre_fstream)) != NULL) {           /* ������Ŀ¼�µ�Ŀ¼�����ƥ�� */
+			memcpy(through_name, through_stream->d_name, BUF_MAX);          /* �������Ŀ¼������֣�����ʹ��stat������ȡ��״̬��Ϣ */
+			stat(through_name, &through_state);                             /* �������Ŀ¼���״̬��Ϣ������ƥ�� */
+
+			if (current_direct_dev == through_state.st_dev && current_direct_inum == through_state.st_ino) {
+				memset(cwd, 0, sizeof(cwd));                    /* ƥ�䵽�˵�ǰĿ¼����������׷�ӵ�cwd�� */
+				strcat(cwd, "/");
+				strcat(cwd, through_stream->d_name);
+				strcat(cwd, buf);                               /* buf��¼������һ��ѭ����cwd������׷�Ӹ���ǰѭ����cwd */
+				strncpy(buf, cwd, BUF_MAX);                     /* ��cwd������buf */
+				break;
+			}
+		}
+		closedir(pre_fstream);
+		chdir("..");											/* �ı䵱ǰĿ¼Ϊ�丸Ŀ¼ */
+	}
+	return buf;
+}
\ No newline at end of file