Process Functions - Win32 Programmer's Reference

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Process Functions

The CreateProcess function enables a debugger to start a process and debug it. The fdwCreate parameter of CreateProcess is used to specify the type of debugging operation. If the DEBUG_PROCESS flag is specified for the parameter, a debugger debugs the new process and all of the process's descendants, provided that the descendants are created without the DEBUG_PROCESS flag.

If the DEBUG_PROCESS and DEBUG_ONLY_THIS_PROCESS flags are specified for fdwCreate, a debugger debugs the new process but none of its descendants.

One debugger can debug another by creating a process with the DEBUG_PROCESS flag. The new process (the debugger being debugged) must then create a process with the DEBUG_PROCESS flag.

The OpenProcess function enables a debugger to obtain the identifier of an existing process. (The DebugActiveProcess function uses this identifier to attach the debugger to the process.) Typically, debuggers open a process with the PROCESS_VM_READ and PROCESS_VM_WRITE flags. Using these flags enables the debugger to read from and write to the virtual memory of the process by using the ReadProcessMemory and WriteProcessMemory functions. For more information about processes, see Processes and Threads.

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