Chapter06 Process Management

lpsaProcess — Points to the process security attribute
structure
lpsaThread — Points to the thread security attribute
structure

(NULL implies default security)
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A PROCESS AND ITS THREADS
Process
Code
Global Variables
Process Heap Process Resources Open Files, Heaps, · · · Environment Block
Thread 1 TLS Stack
· · ·
Thread N TLS Stack
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FILE SEARCHING USING MULTIPLE PROCESSES
Parent Process grep pattern argv [2] ExitProcess argv [1], argv [2], ..., argv [N+1]
Topic IV
Topic V
Process Termination and Synchronization
Process Environments and Security Lab 6-A Lab 6-B
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TOPIC I
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PROCESS CREATION (1 of 8)
BOOL CreateProcess (LPCTSTR lpImageName, LPTSTR lpCommandLine, LPSECURITY_ATTRIBUTES lpsaProcess, LPSECURITY_ATTRIBUTES lpsaThread, BOOL bInheritHandles, DWORD dwCreate, LPVOID lpvEnvironment, LPCTSTR lpCurDir, LPSTARTUPINFO lpsiStartInfo, LPPROCESS_INFORMATION lppiProcInfo)
Return: TRUE only if the process and thread are successfully created
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PROCESS CREATION (2 of 8)
Parameters
lpImageName — Specifies the executable program lpCommandLine — Specifies the command line arguments
Chapter 6
Process Management
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1
OBJECTIVES
Upon completing this chapter, you will be able to:


Describe Windows processes Create and manage independent processes Describe and use the general purpose Windows object synchronization functions to synchronize processes Be prepared to learn interprocess communication and thread management
Contains name/value strings, such as search path.
lpCurDir — Drive and directory for the new process If NULL, parent’s is used) lpsiStartInfo — Main window appearance for the new
grep pattern argv [3] ExitProcess
· · · grep pattern argv [N+1]
ExitProcess
for (i = 1; i <= N; i++) { StartUp.hStdOut = CreateFile (Temp [i]) CreateProcess (grep pattern argv [i + 1]) } WaitForMultipleObjects; · · · /* Display search results */ for (i = 1; i <= N; i++) { CreateProcess (cat Temp [i]) WaitForSingleObject; } ExitProcess

Individual handles must still be specified as inheritable A typical use is to redirect standard I/O — there are numerous examples in the lab exercises

Except for shared memory-mapped files



One or more code segments One or more data segments containing global variables Environment strings with environment variable information The process heap Resources such as open handles and other heaps
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PROCESS CREATION (4 of 8)
dwCreate — Combines flags, including: CREATE_SUSPENDED — The primary thread is in a suspended state and will only run when ResumeThread is called DETACHED_PROCESS — Creates a process without a console CREATE_NEW_CONSOLE — Gives the new process a console
Windows Processes and Threads
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OVERVIEW



A Windows process contains its own independent virtual address space with both code and data Each process contains one or more independently executed threads The Windows thread is the basic executable unit A process can

Can also be unique for each thread

Have a context structure, maintained by the kernel, with machine register values
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process
lppiProcInfo — Structure to contain the returned process
and thread handles and identification
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TOPICS
Topic I
Topic II Topic III
Windows Processes and Threads
Process Management Object Sharing and Handle Inheritance
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PROCESS CREATION (5 of 8)
lpvEnvironment — Points to an environment block for the new process. If NULL, the parent’s environment is used.
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PROCESS CREATION (3 of 8)
bInheritHandles — This is a “master switch” to indicate
that the new process can inherit handles from the parent



Create new threads within the processes Create new, independent processes Manage communication and synchronization between these objects