Transcript OS_EX1
Operating Systems Session 1 Administration Contact details TA: Alexander(Sasha) Apartsin ◦ [email protected] ◦ Office hours: E-mail Homepage: www.cs.tau.ac.il/~apartzin Resources: ◦ Everything at: msdn.microsoft.com ◦ Everything else at: www.google.com Administration Assignments All homework assignments must be performed individually. Usually 2 weeks per assignment Mostly Windows but few are Linux You have to submit all assignments to be able to approach the exam Late submission fine: ◦ A point off the final grade Submission guidelines Submission by e-mail See guidelines on the course’s Web page Administration Classes Each class will consist of 2 parts: Part I: Review of general OS concept and its Windows/Unix implementation Part II: “On-projector” development/coding of a Windows application which makes use of the presented concept Administration Windows Development Setup Home ◦ A reasonable PC with XP/Vista ◦ Free Download from MS site: Visual C++ 2010 Express Edition Visual Studio 2003 @ Lab Windows Essentials Windows Executables EXE :Portable Executable File Format What Windows does when you click on executable file? Read and parse PE file header Allocate resources (e.g. memory) Locate and load libraries (DLL) Map EXE segments (data, code) to the memory Setup an environment (e.g. security) Locate address of start function (main) Call “main” function Windows Essentials Command Shell Processor CMD.com Use special window: console window ◦ Makes system calls to read input from console(e.g. “dir” string) ◦ Makes system calls to fetch list of the files in current directory ◦ Makes system calls to print out results In-class examples and assignments will be windows console applications Windows Essentials Windows Objects & Handles Windows object ◦ Window ◦ Process ◦ Device Handles ◦ ◦ ◦ ◦ Program that uses an object has a handle to it Multiple handles to the same objects Permissions can be associated with handle Reference counting: OS free object’s resources if there are no more handles to it Windows Development Let’s do some programming Win32 files CreateFile ReadFile WriteFile CloseHandle