操作系统 实验一 多线程 （模拟）

/***************************************************************************mycmd模仿Windows的cmd.exe（1）提供两个内部命令(不必开启子进程，在当前进程中执行)， cd和dircd c:\cd ..dir（2）对于执行可执行程序，则开启子进程来执行该程序，例如C:\Program Files\Internet Explorer\iexplore.exe/*实验设计：邹昌伟：[e-mail]*/****************************************************************************/#include <windows.h>#include <stdio.h> #include <string.h>#define BUFSIZE 4096 #define MAXLINE 4096BOOL CreateChildProcess(char * szCmdline); void processCmdline(char * szCmdline);PROCESS_INFORMATION piProcInfo;/******************************************************************显示目录path下的所有文件和子目录@param  char * path   形如 e:\data\*********************************************************************/void dir(char * path){HANDLE hFile;WIN32_FIND_DATA fd;BOOL bRet = TRUE;bRet = TRUE;hFile = FindFirstFile(path, &fd);while (hFile != INVALID_HANDLE_VALUE && bRet){printf("%s\n",fd.cFileName);bRet = FindNextFile(hFile, &fd);}        FindClose(hFile); //}void processCmdline(char * szCmdline){char path[MAXLINE];if(strncmp(szCmdline,"dir",3) == 0){GetCurrentDirectory(MAXLINE,path);strcat(path,"\\*");dir(path);}else if(strncmp(szCmdline,"cd",2) == 0){char * ptr = szCmdline;ptr += 2;while(*ptr == ' ' || *ptr == '\t'){ptr++;}SetCurrentDirectory(ptr);}else{ if(CreateChildProcess(szCmdline)) {              WaitForSingleObject(piProcInfo.hProcess,INFINITE);  //实验要求补全代码部分            CloseHandle(piProcInfo.hProcess);              CloseHandle(piProcInfo.hThread);                    }          else              printf("出错\n");  }printf("\n");}int main(){charcmdline[MAXLINE];char path[MAXLINE];ZeroMemory( &piProcInfo, sizeof(PROCESS_INFORMATION) );printf("Microsoft Windows\n(C)版权所有  FJNU CSE 2013\n\n");GetCurrentDirectory(MAXLINE,path);printf("%s>",path);while (fgets(cmdline, MAXLINE, stdin) != NULL) {if (cmdline[strlen(cmdline) - 1] == '\n'){cmdline[strlen(cmdline) - 1] = 0; /* replace newline with null */}//用户可能直接输入回车if(cmdline[0] != 0){processCmdline(cmdline);}GetCurrentDirectory(MAXLINE,path);printf("%s>",path);}return 0;}BOOL CreateChildProcess(TCHAR * szCmdline){ STARTUPINFO siStartInfo;ZeroMemory( &siStartInfo, sizeof(STARTUPINFO) );siStartInfo.cb = sizeof(STARTUPINFO); siStartInfo.dwFlags |= STARTF_USESTDHANDLES;    siStartInfo.hStdInput = GetStdHandle(STD_INPUT_HANDLE);siStartInfo.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);siStartInfo.hStdError = GetStdHandle(STD_ERROR_HANDLE);return CreateProcess(NULL, szCmdline,     // command line NULL,          // process security attributes NULL,          // primary thread security attributes TRUE,          // handles are inherited 0,             // creation flags NULL,          // use parent's environment NULL,          // use parent's current directory &siStartInfo,  // STARTUPINFO pointer &piProcInfo);  // receives PROCESS_INFORMATION }