From d79a19a2c116022ea77bc678e257a5b6972e8b07 Mon Sep 17 00:00:00 2001
From: prnmxfqg4 <zimujunxue@163.com>
Date: Sat, 25 Jun 2022 02:53:02 +0800
Subject: [PATCH] =?UTF-8?q?=E5=AE=9E=E7=8E=B0=E5=87=BD=E6=95=B0sys=5Fgetcw?=
 =?UTF-8?q?d,=E5=80=9F=E9=89=B4https://www.cnblogs.com/alan-forever/p/3721?=
 =?UTF-8?q?908.html?=
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---
 stat.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 stat.c

diff --git a/stat.c b/stat.c
new file mode 100644
index 0000000..ef09856
--- /dev/null
+++ b/stat.c
@@ -0,0 +1,66 @@
+/*
+ *  linux/fs/stat.c
+ *
+ *  (C) 1991  Linus Torvalds
+ */
+
+#include <errno.h>
+#include <sys/stat.h>
+
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <asm/segment.h>
+
+static void cp_stat(struct m_inode * inode, struct stat * statbuf)
+{
+	struct stat tmp;
+	int i;
+
+	verify_area(statbuf,sizeof (* statbuf));
+	tmp.st_dev = inode->i_dev;
+	tmp.st_ino = inode->i_num;
+	tmp.st_mode = inode->i_mode;
+	tmp.st_nlink = inode->i_nlinks;
+	tmp.st_uid = inode->i_uid;
+	tmp.st_gid = inode->i_gid;
+	tmp.st_rdev = inode->i_zone[0];
+	tmp.st_size = inode->i_size;
+	tmp.st_atime = inode->i_atime;
+	tmp.st_mtime = inode->i_mtime;
+	tmp.st_ctime = inode->i_ctime;
+	for (i=0 ; i<sizeof (tmp) ; i++)
+		put_fs_byte(((char *) &tmp)[i],&((char *) statbuf)[i]);
+}
+
+int sys_stat(char * filename, struct stat * statbuf)
+{
+	struct m_inode * inode;
+
+	if (!(inode=namei(filename)))
+		return -ENOENT;
+	cp_stat(inode,statbuf);
+	iput(inode);
+	return 0;
+}
+
+int sys_lstat(char * filename, struct stat * statbuf)
+{
+	return sys_stat(filename, statbuf);
+}
+
+int sys_fstat(unsigned int fd, struct stat * statbuf)
+{
+	struct file * f;
+	struct m_inode * inode;
+
+	if (fd >= NR_OPEN || !(f=current->filp[fd]) || !(inode=f->f_inode))
+		return -EBADF;
+	cp_stat(inode,statbuf);
+	return 0;
+}
+
+int sys_readlink()
+{
+	return -ENOSYS;
+}