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User.h
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#ifndef USER_H
#define USER_H
#include "FileManager.h"
#include <string>
using namespace std;
/*
* @comment 该类与Unixv6中 struct user结构对应，因此只改变
* 类名，不修改成员结构名字，关于数据类型的对应关系如下:
*/
class User
{
public:
static const int EAX = 0; /* u.u_ar0[EAX]；访问现场保护区中EAX寄存器的偏移量 */
/* u_error's Error Code */
/* 1~32 来自linux 的内核代码中的/usr/include/asm/errno.h, 其余for V6++ */
enum ErrorCode
{
myNOERROR = 0, /* No error */
myEPERM = 1, /* Operation not permitted */
myENOENT = 2, /* No such file or directory */
myESRCH = 3, /* No such process */
myEINTR = 4, /* Interrupted system call */
myEIO = 5, /* I/O error */
myENXIO = 6, /* No such device or address */
myE2BIG = 7, /* Arg list too long */
myENOEXEC = 8, /* Exec format error */
myEBADF = 9, /* Bad file number */
myECHILD = 10, /* No child processes */
myEAGAIN = 11, /* Try again */
myENOMEM = 12, /* Out of memory */
myEACCES = 13, /* Permission denied */
myEFAULT = 14, /* Bad address */
myENOTBLK = 15, /* Block device required */
myEBUSY = 16, /* Device or resource busy */
myEEXIST = 17, /* File exists */
myEXDEV = 18, /* Cross-device link */
myENODEV = 19, /* No such device */
myENOTDIR = 20, /* Not a directory */
myEISDIR = 21, /* Is a directory */
myEINVAL = 22, /* Invalid argument */
myENFILE = 23, /* File table overflow */
myEMFILE = 24, /* Too many open files */
myENOTTY = 25, /* Not a typewriter(terminal) */
myETXTBSY = 26, /* Text file busy */
myEFBIG = 27, /* File too large */
myENOSPC = 28, /* No space left on device */
myESPIPE = 29, /* Illegal seek */
myEROFS = 30, /* Read-only file system */
myEMLINK = 31, /* Too many links */
myEPIPE = 32, /* Broken pipe */
myENOSYS = 100,
//myEFAULT = 106
};
public:
unsigned long u_rsav[2]; /* 用于保存esp与ebp指针 */
unsigned long u_ssav[2]; /* 用于对esp和ebp指针的二次保护 */
/* 系统调用相关成员 */
unsigned int u_ar0[1024]; /* 指向核心栈现场保护区中EAX寄存器
存放的栈单元，本字段存放该栈单元的地址。
在V6中r0存放系统调用的返回值给用户程序，
x86平台上使用EAX存放返回值，替代u.u_ar0[R0] */
int u_arg[5]; /* 存放当前系统调用参数 */
string u_dirp; /* 系统调用参数(一般用于Pathname)的指针 */
/* 文件系统相关成员 */
Inode* u_cdir; /* 指向当前目录的Inode指针 */
Inode* u_pdir; /* 指向父目录的Inode指针 */
DirectoryEntry u_dent; /* 当前目录的目录项 */
char u_dbuf[DirectoryEntry::dir_name_size]; /* 当前路径分量，长度应当为 DirectoryEntry::DIRSIZ */
string u_curdir; /* 当前工作目录完整路径 */
ErrorCode u_error; /* 存放错误码 */
/* 文件系统相关成员 */
OpenFiles u_ofiles; /* 进程打开文件描述符表对象 */
/* 文件I/O操作 */
IOParameter u_IOParam; /* 记录当前读、写文件的偏移量，用户目标区域和剩余字节数参数 */
FileManager* u_FileManager;
string ls;
/* Member Functions */
public:
User();
~User();
/* 根据系统调用参数uid设置有效用户ID，真实用户ID，进程用户ID(p_uid) */
void Setuid();
/* 获取用户ID，低16比特为真实用户ID(u_ruid)，高16比特为有效用户ID(u_uid) */
void Getuid();
/* 根据系统调用参数gid设置有效组ID，真实组ID */
void Setgid();
/* 获取组ID, 低16比特为真实组ID(u_rgid)，高16比特为有效组ID(u_gid) */
void Getgid();
/* 获取当前用户工作目录 */
void Pwd();
/* 检查当前用户是否是超级用户 */
bool SUser();
void Cd(string dirName);
void Mkdir(string dirName);
void Create(string fileName, string mode);
void Delete(string fileName);
void Open(string fileName, string mode);
void Close(string fd);
void Seek(string fd, string offset, string origin);
void Write(string fd, string inFile, string size);
void Read(string fd, string outFile, string size);
void Ls();
bool IsError();
void EchoError(enum ErrorCode err);
int INodeMode(string mode);
int FileMode(string mode);
bool checkPathName(string path);
};
#endif // !USER_H