Patch procf (#90)

* 1234

* 123

* 合并master

* procfs

* 1

* procfs展示进程基本信息

* modified code

* 恢复权限

* 恢复权限

 #恢复权限

* modify permission

* 删除run.sh

* 解决第一次编译时磁盘镜像权限错误的问题

* 恢复.vscode/c_cpp_properties.json

* 删除process.c中错误的do_fork

* remake procfs

* 修改一些变量名

* 修改类型

* modified

* data_puts缓冲区溢出后return

Co-authored-by: longjin <[email protected]>

.vscode/settings.json

@@ -148,13 +148,18 @@
         "timer.h": "c",
         "hid.h": "c",
         "cfs.h": "c",
+        "proc.h": "c",
+        "compiler.h": "c",
+        "hpet.h": "c",
+        "numa.h": "c",
+        "procfs.h": "c",
         "err.h": "c",
         "rtc.h": "c",
         "list.h": "c",
-        "compiler.h": "c",
         "completion.h": "c",
         "fat32.h": "c",
-        "irqflags.h": "c"
+        "irqflags.h": "c",
+        "dirent.h": "c"
     },
     "C_Cpp.errorSquiggles": "Enabled",
     "esbonio.sphinx.confDir": "",

kernel/src/common/glib.h

@@ -253,14 +253,17 @@ static inline uint64_t copy_to_user(void *dst, void *src, uint64_t size)
      * @brief 先每次搬运8 bytes，剩余就直接一个个byte搬运
      *
      */
-    asm volatile("rep   \n\t"
-                 "movsq  \n\t"
-                 "movq %3, %0   \n\t"
-                 "rep   \n\t"
-                 "movsb \n\t"
-                 : "=&c"(size), "=&D"(tmp0), "=&S"(tmp1)
-                 : "r"(size & 7), "0"(size >> 3), "1"(dst), "2"(src)
-                 : "memory");
+    // todo:编译有bug
+    // asm volatile("rep   \n\t"
+    //              "movsq  \n\t"
+    //              "movq %3, %0   \n\t"
+    //              "rep   \n\t"
+    //              "movsb \n\t"
+    //              : "=&c"(size), "=&D"(tmp0), "=&S"(tmp1)
+    //              : "r"(size & 7), "0"(size >> 3), "1"(dst), "2"(src)
+    //              : "memory");
+    memcpy(dst,src,size);
+    
     return size;
 }
 

kernel/src/common/list.h

@@ -2,6 +2,7 @@
 #include <common/stddef.h>
 
 #include <asm/asm.h>
+#include <common/compiler.h>
 
 //链表数据结构
 struct List

kernel/src/common/string.h

@@ -75,4 +75,13 @@ static inline int memcmp(const void *s1, const void *s2, size_t len)
         diff = *(const unsigned char *)(s1 - 1) - *(const unsigned char *)(s2 - 1);
 
     return diff;
-}
+}
+
+/**
+ * @brief 拼接两个字符串（将src接到dest末尾）
+ *
+ * @param dest 目标串
+ * @param src 源串
+ * @return char*
+ */
+char *strcat(char *dest, const char *src);

kernel/src/filesystem/Makefile

@@ -3,7 +3,7 @@ CFLAGS += -I .
 
 
 kernel_fs_objs:= $(shell find ./*.c)
-kernel_fs_subdirs:= devfs VFS fat32 rootfs
+kernel_fs_subdirs:= devfs VFS fat32 rootfs procfs
 
 ECHO:
 	@echo "$@"

kernel/src/filesystem/VFS/VFS.c

@@ -173,7 +173,7 @@ struct vfs_dir_entry_t *vfs_path_walk(const char *path, uint64_t flags)
 
             memcpy(dentry->name, (void *)tmp_path, tmp_path_len);
             dentry->name[tmp_path_len] = '\0';
-            // kdebug("tmp_path_len=%d, dentry->name= %s", tmp_path_len, dentry->name);
+            // kdebug("tmp_path_len=%d, dentry->name=%s", tmp_path_len, dentry->name);
             dentry->name_length = tmp_path_len;
 
             if (parent->dir_inode->inode_ops->lookup(parent->dir_inode, dentry) == NULL)
@@ -370,11 +370,16 @@ uint64_t sys_mkdir(struct pt_regs *regs)
  *
  * @param filename 文件路径
  * @param flags 标志位
+ * @param from_user 是否由用户态调用,1为是，0为否
  * @return uint64_t 错误码
  */
-uint64_t do_open(const char *filename, int flags)
+uint64_t do_open(const char *filename, int flags, bool from_user)
 {
-    long path_len = strnlen_user(filename, PAGE_4K_SIZE) + 1;
+    long path_len = 0;
+    if (from_user)
+        path_len = strnlen_user(filename, PAGE_4K_SIZE) + 1;
+    else
+        path_len = strnlen(filename, PAGE_4K_SIZE) + 1;
 
     if (path_len <= 0) // 地址空间错误
         return -EFAULT;
@@ -385,8 +390,12 @@ uint64_t do_open(const char *filename, int flags)
     char *path = (char *)kzalloc(path_len, 0);
     if (path == NULL)
         return -ENOMEM;
-
-    strncpy_from_user(path, filename, path_len);
+    
+    if (from_user)
+        strncpy_from_user(path, filename, path_len);
+    else
+        strncpy(path, filename, path_len);
+    
     // 去除末尾的 '/'
     if (path_len >= 2 && path[path_len - 2] == '/')
     {
@@ -430,7 +439,7 @@ uint64_t do_open(const char *filename, int flags)
         dentry = vfs_alloc_dentry(path_len - tmp_index);
 
         dentry->name_length = path_len - tmp_index - 2;
-        
+
         // kdebug("to create new file:%s   namelen=%d", dentry->name, dentry->name_length);
         strncpy(dentry->name, path + tmp_index + 1, dentry->name_length);
         dentry->parent = parent_dentry;
@@ -527,10 +536,33 @@ uint64_t sys_open(struct pt_regs *regs)
 {
     char *filename = (char *)(regs->r8);
     int flags = (int)(regs->r9);
-
-    return do_open(filename, flags);
+    return do_open(filename, flags, true);
 }
 
+/**
+ * @brief 关闭文件
+ *
+ * @param fd_num 文件描述符
+ * @return uint64_t 错误码
+ */
+uint64_t vfs_close(int fd_num)
+{
+    // 校验文件描述符范围
+    if (fd_num < 0 || fd_num > PROC_MAX_FD_NUM)
+        return -EBADF;
+    // 文件描述符不存在
+    if (current_pcb->fds[fd_num] == NULL)
+        return -EBADF;
+    struct vfs_file_t *file_ptr = current_pcb->fds[fd_num];
+    uint64_t ret;
+    // If there is a valid close function
+    if (file_ptr->file_ops && file_ptr->file_ops->close)
+        ret = file_ptr->file_ops->close(file_ptr->dEntry->dir_inode, file_ptr);
+
+    kfree(file_ptr);
+    current_pcb->fds[fd_num] = NULL;
+    return 0;
+}
 /**
  * @brief 动态分配dentry以及路径字符串名称
  *

kernel/src/filesystem/VFS/VFS.h

@@ -157,14 +157,14 @@ struct vfs_inode_operations_t
                    struct vfs_index_node_t *new_inode, struct vfs_dir_entry_t *new_dEntry);
     long (*getAttr)(struct vfs_dir_entry_t *dEntry, uint64_t *attr);
     long (*setAttr)(struct vfs_dir_entry_t *dEntry, uint64_t *attr);
-    
+
     /**
      * @brief 取消inode和dentry之间的链接关系（删除文件）
-     * 
+     *
      * @param inode 要被取消关联关系的目录项的【父目录项】
      * @param dentry 要被取消关联关系的子目录项
      */
-    long (*unlink)(struct vfs_index_node_t * inode, struct vfs_dir_entry_t * dentry);
+    long (*unlink)(struct vfs_index_node_t *inode, struct vfs_dir_entry_t *dentry);
 };
 
 struct vfs_dir_entry_operations_t
@@ -249,14 +249,15 @@ struct vfs_dir_entry_t *vfs_alloc_dentry(const int name_size);
  */
 struct vfs_index_node_t *vfs_alloc_inode();
 
+uint64_t do_open(const char *filename, int flags, bool from_user);
+
 /**
- * @brief 打开文件
+ * @brief 关闭文件
  *
- * @param filename 文件路径
- * @param flags 标志位
+ * @param fd_num 文件描述符
  * @return uint64_t 错误码
  */
-uint64_t do_open(const char *filename, int flags);
+uint64_t vfs_close(int fd_num);
 
 /**
  * @brief 创建文件夹

kernel/src/filesystem/procfs/Makefile

@@ -0,0 +1,17 @@
+
+CFLAGS += -I .
+
+
+kernel_fs_procfs_objs:= $(shell find ./*.c)
+
+
+ECHO:
+	@echo "$@"
+
+
+$(kernel_fs_procfs_objs): ECHO
+	$(CC) $(CFLAGS) -c $@ -o [email protected]
+
+
+all: $(kernel_fs_procfs_objs)
+

kernel/src/filesystem/procfs/procfs.c

@@ -0,0 +1,497 @@
+#include "procfs.h"
+
+//定义文件类型
+#define PROC_STATUS 1
+
+//定义buffer大小
+#define FDATA_RBUF_SIZE 1024
+
+struct vfs_super_block_operations_t procfs_sb_ops;
+struct vfs_dir_entry_operations_t procfs_dentry_ops;
+struct vfs_file_operations_t procfs_file_ops;
+struct vfs_inode_operations_t procfs_inode_ops;
+
+struct vfs_superblock_t procfs_sb = {0};
+struct vfs_dir_entry_t *procfs_root_dentry; // 根结点的dentry
+static spinlock_t procfs_global_lock;       // procfs的全局锁
+const char __procfs_mount_path[] = "/proc"; // 挂在路径
+
+static int64_t proc_create_file(const char *path, mode_t type, long pid);
+static int __check_name_available(const char *name, int namelen, int8_t reserved);
+static long simple_procfs_read(void *to, int64_t count, long *position, void *from, int64_t available);
+
+/**
+ * @brief 文件的私有信息结构
+ *
+ */
+struct procfs_file_private_data
+{
+    int readlen;
+    char *rbuffer;
+    int writelen;
+    char *wbuffer;
+};
+
+/**
+ * @brief 创建procfs的super block
+ *
+ * @param blk 未使用（procfs为伪文件系统，不需要物理设备）
+ * @return struct vfs_superblock_t*
+ */
+struct vfs_superblock_t *procfs_read_superblock(struct block_device *blk)
+{
+    procfs_sb.blk_device = NULL;
+    procfs_sb.root = procfs_root_dentry;
+    procfs_sb.sb_ops = &procfs_sb_ops;
+    procfs_sb.dir_ops = &procfs_dentry_ops;
+    procfs_sb.private_sb_info = NULL;
+    kdebug("procfs read superblock done");
+    return &procfs_sb;
+}
+
+static void procfs_write_superblock(struct vfs_superblock_t *sb)
+{
+    return;
+}
+static void procfs_put_superblock(struct vfs_superblock_t *sb)
+{
+    return;
+}
+static void procfs_write_inode(struct vfs_index_node_t *inode)
+{
+    return;
+}
+struct vfs_super_block_operations_t procfs_sb_ops = {
+    .write_superblock = &procfs_write_superblock,
+    .put_superblock = &procfs_put_superblock,
+    .write_inode = &procfs_write_inode,
+};
+
+static long procfs_compare(struct vfs_dir_entry_t *parent_dEntry, char *source_filename, char *dest_filename)
+{
+    return 0;
+}
+static long procfs_hash(struct vfs_dir_entry_t *dEntry, char *filename)
+{
+    return 0;
+}
+static long procfs_release(struct vfs_dir_entry_t *dEntry)
+{
+    return 0;
+}
+static long procfs_iput(struct vfs_dir_entry_t *dEntry, struct vfs_index_node_t *inode)
+{
+    return 0;
+}
+struct vfs_dir_entry_operations_t procfs_dentry_ops = {
+    .compare = &procfs_compare,
+    .hash = &procfs_hash,
+    .release = &procfs_release,
+    .iput = &procfs_iput,
+};
+
+void data_puts(struct procfs_file_private_data *fdata, const char *s)
+{
+    int len = strlen(s);
+    if(fdata->readlen+len > FDATA_RBUF_SIZE)
+    {
+        kerror("out of buffer");
+        return;
+    }
+    strncpy(fdata->rbuffer + fdata->readlen, s, len);
+    fdata->readlen += len;
+}
+
+static long procfs_open(struct vfs_index_node_t *inode, struct vfs_file_t *file_ptr)
+{
+    if (inode->attribute & VFS_IF_DIR)
+    {
+        return 0;
+    }
+    struct procfs_inode_info_t *finode = inode->private_inode_info;
+    if (finode == NULL)
+    {
+        return 0;
+    }
+    // kdebug("finode=%#018lx", finode);
+    struct procfs_file_private_data *fdata = kzalloc(sizeof(struct procfs_file_private_data), 0);
+    struct process_control_block *pcb_t = process_find_pcb_by_pid(finode->pid);
+    //判断文件类型
+    int mode = finode->type;
+    fdata->rbuffer = kzalloc(FDATA_RBUF_SIZE, 0);
+    int len = 0;
+    switch (mode)
+    {
+    case 1:
+        data_puts(fdata, "Name:");
+        data_puts(fdata, pcb_t->name);
+        data_puts(fdata, "\nstate:");
+        data_puts(fdata, ltoa(pcb_t->state));
+        data_puts(fdata, "\npid:");
+        data_puts(fdata, ltoa(pcb_t->pid));
+        data_puts(fdata, "\nPpid:");
+        data_puts(fdata, ltoa(pcb_t->parent_pcb->pid));
+        data_puts(fdata, "\ncpu_id:");
+        data_puts(fdata, ltoa(pcb_t->cpu_id));
+        data_puts(fdata, "\npriority:");
+        data_puts(fdata, ltoa(pcb_t->priority));
+        // data_puts(fdata,"\n");
+
+        uint64_t hiwater_vm, text, data;
+        hiwater_vm = pcb_t->mm->vmas->vm_end - pcb_t->mm->vmas->vm_start;
+        text = pcb_t->mm->code_addr_end - pcb_t->mm->code_addr_start;
+        data = pcb_t->mm->data_addr_end - pcb_t->mm->data_addr_start;
+
+        data_puts(fdata, "\nVmPeak:");
+        data_puts(fdata, ltoa(hiwater_vm));
+        data_puts(fdata, " kB");
+        data_puts(fdata, "\nVmData:");
+        data_puts(fdata, ltoa(data));
+        data_puts(fdata, " kB");
+        data_puts(fdata, "\nVmExe:");
+        data_puts(fdata, ltoa(text));
+        data_puts(fdata, " kB\n");
+
+        break;
+
+    default:
+        break;
+    }
+
+    inode->file_size = fdata->readlen;
+    file_ptr->private_data = fdata;
+    return 0;
+}
+static long procfs_close(struct vfs_index_node_t *inode, struct vfs_file_t *file_ptr)
+{
+    return 0;
+}
+static long procfs_read(struct vfs_file_t *file_ptr, char *buf, int64_t count, long *position)
+{
+    // 获取私有信息
+    struct procfs_file_private_data *priv = (struct procfs_file_private_data *)file_ptr->private_data;
+    // kdebug("priv=%#018lx", priv);
+    if (!priv->rbuffer)
+        return -EINVAL;
+
+    return simple_procfs_read(buf, count, position, priv->rbuffer, priv->readlen);
+}
+
+/**
+ * @brief 检查读取并将数据从内核拷贝到用户
+ *
+ * @param to: 要读取的用户空间缓冲区
+ * @param count: 要读取的最大字节数
+ * @param position: 缓冲区中的当前位置
+ * @param from: 要读取的缓冲区
+ * @param available: 读取的缓冲区大小
+ *
+ * @return long 读取字节数
+ */
+static long simple_procfs_read(void *to, int64_t count, long *position, void *from, int64_t available)
+{
+    long pos = *position;
+    // kdebug("pos:%ld",pos);
+    // kdebug("count:%ld",count);
+    // kdebug("available:%ld",available);
+    int64_t ret = 0;
+
+    if (pos < 0)
+        return -EINVAL;
+    if (pos >= available || !count)
+        return 0;
+    if (count > available - pos)
+        count = available - pos;
+    // kdebug("count:%d",count);
+    ret = copy_to_user(to, from + pos, count);
+
+    *position = pos + ret;
+    return ret;
+}
+
+static long procfs_write(struct vfs_file_t *file_ptr, char *buf, int64_t count, long *position)
+{
+    return 0;
+}
+/**
+ * @brief 调整文件的访问位置
+ *
+ * @param file_ptr 文件描述符号
+ * @param offset 偏移量
+ * @param whence 调整模式
+ * @return uint64_t 调整结束后的文件访问位置
+ */
+static long procfs_lseek(struct vfs_file_t *file_ptr, long offset, long whence)
+{
+    struct vfs_index_node_t *inode = file_ptr->dEntry->dir_inode;
+
+    long pos = 0;
+    switch (whence)
+    {
+    case SEEK_SET: // 相对于文件头
+        pos = offset;
+        break;
+    case SEEK_CUR: // 相对于当前位置
+        pos = file_ptr->position + offset;
+        break;
+    case SEEK_END: // 相对于文件末尾
+        pos = file_ptr->dEntry->dir_inode->file_size + offset;
+        break;
+
+    default:
+        return -EINVAL;
+        break;
+    }
+
+    if (pos < 0 || pos > file_ptr->dEntry->dir_inode->file_size)
+        return -EOVERFLOW;
+    file_ptr->position = pos;
+
+    return pos;
+}
+static long procfs_ioctl(struct vfs_index_node_t *inode, struct vfs_file_t *file_ptr, uint64_t cmd, uint64_t arg)
+{
+    return 0;
+}
+
+/**
+ * @brief 读取该目录下的目录项
+ *
+ * @param file_ptr 文件结构体的指针
+ * @param dirent 返回的dirent
+ * @param filler 填充dirent的函数
+ *
+ * @return long 错误码
+ */
+static long procfs_readdir(struct vfs_file_t *file_ptr, void *dirent, vfs_filldir_t filler)
+{
+    struct vfs_dir_entry_t *dentry = file_ptr->dEntry;
+    struct List *list = &dentry->subdirs_list;
+    // 先切换到position处
+    for (int i = 0; i <= file_ptr->position; ++i)
+    {
+        list = list_next(list);
+        if (list == &dentry->subdirs_list) // 找完了
+            goto failed;
+    }
+
+    // 若存在目录项，则增加偏移量
+    ++file_ptr->position;
+    // 获取目标dentry（由于是子目录项，因此是child_node_list）
+    struct vfs_dir_entry_t *target_dent = container_of(list, struct vfs_dir_entry_t, child_node_list);
+
+    char *name = (char *)kzalloc(target_dent->name_length + 1, 0);
+    strncpy(name, target_dent->name, target_dent->name_length);
+    uint32_t dentry_type;
+    if (target_dent->dir_inode->attribute & VFS_IF_DIR)
+        dentry_type = VFS_IF_DIR;
+
+    return filler(dirent, file_ptr->position - 1, name, target_dent->name_length, dentry_type, file_ptr->position - 1);
+failed:;
+    return 0;
+}
+
+struct vfs_file_operations_t procfs_file_ops = {
+    .open = &procfs_open,
+    .close = &procfs_close,
+    .read = &procfs_read,
+    .write = &procfs_write,
+    .lseek = &procfs_lseek,
+    .ioctl = &procfs_ioctl,
+    .readdir = &procfs_readdir,
+};
+
+/**
+ * @brief 检查文件名是否合法
+ *
+ * @param name 文件名
+ * @param namelen 文件名长度
+ * @param reserved 保留字段
+ * @return int 合法：0， 其他：错误码
+ */
+static int __check_name_available(const char *name, int namelen, int8_t reserved)
+{
+    if (namelen > 255 || namelen <= 0)
+        return -ENAMETOOLONG;
+    // 首个字符不能是空格或者'.'
+    if (name[0] == 0x20 || name[0] == '.')
+        return -EINVAL;
+
+    return 0;
+};
+
+/**
+ * @brief 在procfs中创建文件
+ *
+ * @param parent_inode 父目录的inode
+ * @param dest_dEntry 目标dentry
+ * @param mode 创建模式
+ * @return long 错误码
+ */
+static long procfs_create(struct vfs_index_node_t *parent_inode, struct vfs_dir_entry_t *dest_dEntry, int mode)
+{
+    int64_t retval = 0;
+
+    //检验名称和法性
+    retval = __check_name_available(dest_dEntry->name, dest_dEntry->name_length, 0);
+    if (retval != 0)
+        return retval;
+    if (dest_dEntry->dir_inode != NULL)
+        return -EEXIST;
+
+    struct vfs_index_node_t *inode = vfs_alloc_inode();
+    dest_dEntry->dir_inode = inode;
+    dest_dEntry->dir_ops = &procfs_dentry_ops;
+
+    inode->attribute = VFS_IF_FILE;
+    inode->file_ops = &procfs_file_ops;
+    inode->file_size = 0;
+    inode->sb = parent_inode->sb;
+    inode->inode_ops = &procfs_inode_ops;
+    // kdebug("finode:%#018lx",inode->private_inode_info);
+    inode->blocks = 0;
+
+    return 0;
+}
+static struct vfs_dir_entry_t *procfs_lookup(struct vfs_index_node_t *parent_inode, struct vfs_dir_entry_t *dest_dEntry)
+{
+    return NULL;
+}
+
+/**
+ * @brief 在procfs中创建文件夹(作用是完善子文件夹的inode信息)
+ *
+ * @param inode 父目录的inode
+ * @param dEntry 目标dentry
+ * @param mode 创建模式
+ * @return long 错误码
+ */
+static long procfs_mkdir(struct vfs_index_node_t *parent_inode, struct vfs_dir_entry_t *dEntry, int mode)
+{
+    int64_t retval = 0;
+
+    //检验名称和法性
+    retval = __check_name_available(dEntry->name, dEntry->name_length, 0);
+    if (retval != 0)
+        return retval;
+
+    struct vfs_index_node_t *inode = vfs_alloc_inode();
+    dEntry->dir_inode = inode;
+    dEntry->dir_ops = &procfs_dentry_ops;
+
+    //结点信息初始化
+    struct procfs_inode_info_t *finode = (struct procfs_inode_info_t *)kzalloc(sizeof(struct procfs_inode_info_t), 0);
+    finode->pid = 0;
+    finode->type = 0;
+
+    inode->attribute = VFS_IF_DIR;
+    inode->file_ops = &procfs_file_ops;
+    inode->file_size = 0;
+    inode->sb = parent_inode->sb;
+    inode->inode_ops = &procfs_inode_ops;
+    inode->private_inode_info = (void *)finode;
+    // kdebug("inode->private_inode_info=%#018lx", inode->private_inode_info);
+    inode->blocks = 0;
+
+    return 0;
+}
+struct vfs_inode_operations_t procfs_inode_ops = {
+    .create = &procfs_create,
+    .lookup = &procfs_lookup,
+    .mkdir = &procfs_mkdir,
+};
+
+struct vfs_filesystem_type_t procfs_fs_type = {
+    .name = "procfs",
+    .fs_flags = 0,
+    .read_superblock = procfs_read_superblock,
+    .next = NULL,
+};
+
+static __always_inline void __procfs_init_root_inode()
+{
+    procfs_root_dentry->dir_inode = vfs_alloc_inode();
+    procfs_root_dentry->dir_inode->file_ops = &procfs_file_ops;
+    procfs_root_dentry->dir_inode->inode_ops = &procfs_inode_ops;
+
+    procfs_root_dentry->dir_inode->private_inode_info = NULL;
+    procfs_root_dentry->dir_inode->sb = &procfs_sb;
+    procfs_root_dentry->dir_inode->attribute = VFS_IF_DIR;
+}
+/**
+ * @brief 初始化procfs的根dentry
+ */
+static __always_inline void __procfs_init_root_dentry()
+{
+    procfs_root_dentry = vfs_alloc_dentry(0);
+    procfs_root_dentry->dir_ops = &procfs_dentry_ops;
+
+    __procfs_init_root_inode();
+}
+
+/**
+ * @brief 创建进程对应文件夹
+ *
+ * @param pid 进程号
+ * @return int64_t 错误码
+ */
+int64_t procfs_register_pid(long pid)
+{
+    int retval = 0;
+
+    //创建文件夹
+    char tmp[70] = {0};
+    int len = strlen(ltoa(pid));
+    // kdebug("len:%d",len);
+    strcpy(tmp, "/proc/");
+    strcpy(tmp + 6, ltoa(pid));
+    // kdebug("tmp:%s",tmp);
+    retval = vfs_mkdir(tmp, 0, false);
+
+    // kdebug("aaaaaaaaaaaaaaa");
+    //创建各相关文件
+    strcpy(tmp + 6 + len, "/status");
+    // kdebug("tmp:%s",tmp);
+    retval = proc_create_file(tmp, PROC_STATUS, pid);
+
+    return retval;
+}
+
+/**
+ * @brief 创建文件
+ *
+ * @param path 文件夹路径
+ * @param type 文件类型
+ * @param pid pid
+ * @return int64_t 错误码
+ */
+static int64_t proc_create_file(const char *path, mode_t type, long pid)
+{
+    kdebug("procfs: Creating: %s", path);
+    int ret = do_open(path, O_CREAT, false);
+    // kdebug("ret:%d", ret);
+    struct vfs_dir_entry_t *dentry = vfs_path_walk(path, 0);
+    // kdebug("dentry=%#018lx", dentry);
+
+    //结点信息配置
+    struct procfs_inode_info_t *finode = (struct procfs_inode_info_t *)kzalloc(sizeof(struct procfs_inode_info_t), 0);
+    finode->pid = pid;
+    // kdebug("pid:%d",finode->pid);
+    finode->type = type;
+    dentry->dir_inode->private_inode_info = (void *)finode;
+    ret = vfs_close(ret);
+
+    return ret;
+}
+
+/**
+ * @brief 初始化procfs
+ *
+ */
+void procfs_init()
+{
+    __procfs_init_root_dentry();
+    vfs_register_filesystem(&procfs_fs_type);
+    spin_init(&procfs_global_lock);
+    vfs_mount_fs(__procfs_mount_path, "procfs", NULL);
+}

kernel/src/filesystem/procfs/procfs.h

@@ -0,0 +1,43 @@
+#pragma once
+
+#include <common/list.h>
+#include <common/lockref.h>
+#include <common/spinlock.h>
+#include <common/stdio.h>
+#include <common/stdlib.h>
+#include <common/string.h>
+#include <filesystem/VFS/VFS.h>
+#include <process/process.h>
+
+/**
+ * @brief 初始化procfs
+ *
+ */
+void procfs_init();
+
+/**
+ * @brief proc文件系统的超级块信息结构体
+ *
+ */
+struct procfs_sb_info_t
+{
+    struct lockref lockref; //该lockref包含自旋锁以及引用计数
+};
+
+/**
+ * @brief procfs文件系统的结点私有信息
+ *
+ */
+struct procfs_inode_info_t
+{
+    long pid;
+    int type;
+};
+
+/**
+ * @brief 创建进程对应文件
+ *
+ * @param pid 进程号
+ * @return int64_t 错误码
+ */
+int64_t procfs_register_pid(long pid);

kernel/src/filesystem/rootfs/rootfs.c

@@ -160,6 +160,10 @@ void rootfs_init()
     // 创建/dev等目录的dentry（以便文件系统的mount）
     if (rootfs_add_dir("dev") != 0)
         kerror("create dir 'dev' in rootfs failed");
+    
+    // 创建/procfs目录的dentry
+    if (rootfs_add_dir("proc") != 0)
+        kerror("create dir 'proc' in rootfs failed");
 }
 
 /**

kernel/src/libs/string.c

@@ -107,3 +107,15 @@ long strnlen_user(const char *src, unsigned long maxlen)
     return size <= maxlen ? size : maxlen;
 }
 
+/**
+ * @brief 拼接两个字符串（将src接到dest末尾）
+ *
+ * @param dest 目标串
+ * @param src 源串
+ * @return char*
+ */
+char *strcat(char *dest, const char *src)
+{
+    strcpy(dest + strlen(dest), src);
+    return dest;
+}

kernel/src/main.c

@@ -21,6 +21,7 @@
 
 #include <filesystem/VFS/VFS.h>
 #include <filesystem/devfs/devfs.h>
+#include <filesystem/procfs/procfs.h>
 #include <filesystem/fat32/fat32.h>
 
 #include "driver/acpi/acpi.h"
@@ -142,6 +143,8 @@ void system_initialize()
 
     vfs_init();
     devfs_init();
+    procfs_init();
+    
     cpu_init();
     ps2_keyboard_init();
     tty_init();

kernel/src/process/fork.c

@@ -2,6 +2,7 @@
 #include <common/err.h>
 #include <common/kthread.h>
 #include <common/spinlock.h>
+#include <filesystem/procfs/procfs.h>
 
 extern spinlock_t process_global_pid_write_lock;
 extern long process_global_pid;
@@ -135,6 +136,9 @@ unsigned long do_fork(struct pt_regs *regs, unsigned long clone_flags, unsigned
     // 唤醒进程
     process_wakeup(tsk);
 
+    //创建对应procfs文件
+    procfs_register_pid(tsk->pid);
+
     return retval;
 
 copy_thread_failed:;

kernel/src/process/process.c

@@ -22,6 +22,7 @@
 #include <filesystem/devfs/devfs.h>
 #include <filesystem/fat32/fat32.h>
 #include <filesystem/rootfs/rootfs.h>
+#include <filesystem/procfs/procfs.h>
 #include <ktest/ktest.h>
 #include <mm/slab.h>
 #include <sched/sched.h>

kernel/src/syscall/syscall.c

@@ -135,21 +135,7 @@ uint64_t sys_close(struct pt_regs *regs)
     int fd_num = (int)regs->r8;
 
     // kdebug("sys close: fd=%d", fd_num);
-    // 校验文件描述符范围
-    if (fd_num < 0 || fd_num > PROC_MAX_FD_NUM)
-        return -EBADF;
-    // 文件描述符不存在
-    if (current_pcb->fds[fd_num] == NULL)
-        return -EBADF;
-    struct vfs_file_t *file_ptr = current_pcb->fds[fd_num];
-    uint64_t ret;
-    // If there is a valid close function
-    if (file_ptr->file_ops && file_ptr->file_ops->close)
-        ret = file_ptr->file_ops->close(file_ptr->dEntry->dir_inode, file_ptr);
-
-    kfree(file_ptr);
-    current_pcb->fds[fd_num] = NULL;
-    return 0;
+    return vfs_close(fd_num);
 }
 
 /**

tools/create_hdd_image.sh

@@ -22,4 +22,5 @@ sudo losetup -d ${LOOP_DEVICE}
 
 echo "Successfully created disk image."
 mkdir -p ../bin
+chmod 777 disk.img
 mv ./disk.img ../bin/

tools/write_disk_image.sh

@@ -23,7 +23,7 @@ bins[0]=${kernel}
 for file in ${bins[*]};do
 if [ ! -x $file ]; then
 echo "$file 不存在！"
-exit
+exit 1
 fi
 done
 
@@ -43,7 +43,7 @@ fi
 # 判断是否存在硬盘镜像文件，如果不存在，就创建一个(docker模式下，由于镜像中缺少qemu-img不会创建)
 if [ ! -f "${root_folder}/bin/disk.img" ]; then
     echo "创建硬盘镜像文件..."
-    sudo bash ./create_hdd_image.sh
+    sudo bash ./create_hdd_image.sh || exit 1
 fi
 
 mkdir -p ${root_folder}/bin/disk_mount
@@ -53,6 +53,7 @@ cp ${kernel} ${root_folder}/bin/disk_mount/boot
 # 拷贝用户程序到磁盘镜像
 mkdir -p ${root_folder}/bin/disk_mount/bin
 mkdir -p ${root_folder}/bin/disk_mount/dev
+mkdir -p ${root_folder}/bin/disk_mount/proc
 
 cp -r ${root_folder}/bin/user/* ${root_folder}/bin/disk_mount/bin
 touch ${root_folder}/bin/disk_mount/dev/keyboard.dev

user/apps/shell/cmd.c

@@ -312,7 +312,6 @@ int shell_cmd_cat(int argc, char **argv)
         file_size -= l;
         printf("%s", buf);
     }
-
     close(fd);
     free(buf);
     free(file_path);