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CreateRemoteThread info  Overview  Group

The CreateRemoteThread function creates a thread that runs in the address space of another process.

HANDLE CreateRemoteThread(

    HANDLE hProcess,

// handle to process to create thread in

    LPSECURITY_ATTRIBUTES lpThreadAttributes,

// pointer to thread security attributes

    DWORD dwStackSize,

// initial thread stack size, in bytes

    LPTHREAD_START_ROUTINE lpStartAddress,

// pointer to thread function

    LPVOID lpParameter,

// pointer to argument for new thread

    DWORD dwCreationFlags,

// creation flags

    LPDWORD lpThreadId 

// pointer to returned thread identifier

   );

Parameters

hProcess
Identifies the process in which the thread is to be created.

Windows NT: The handle must have PROCESS_CREATE_THREAD access. For more information, see Process Objects.

lpThreadAttributes
Pointer to a SECURITY_ATTRIBUTES structure that specifies a security descriptor for the new thread and determines whether child processes can inherit the returned handle. If lpThreadAttributes is NULL, the thread gets a default security descriptor and the handle cannot be inherited.
dwStackSize
Specifies the size, in bytes, of the stack for the new thread. If this value is zero, the stack size defaults to the same size as that of the primary thread of the process. The stack is allocated automatically in the memory space of the process and is freed when the thread terminates. Note that the stack size grows as necessary.
lpStartAddress
Points to the starting address of the new thread. This is typically the address of a function declared with the WINAPI calling convention that never returns and that accepts a single 32-bit pointer as an argument.
lpParameter
Points to a single 32-bit value passed to the thread.
dwCreationFlags
Specifies additional flags that control the creation of the thread. If the CREATE_SUSPENDED flag is specified, the thread is created in a suspended state and will not run until the ResumeThread function is called. If this value is zero, the thread runs immediately after creation.
lpThreadId
Points to a 32-bit variable that receives the thread identifier.

Return Values

If the function succeeds, the return value is a handle to the new thread.

If the function fails, the return value is NULL. To get extended error information, call GetLastError.

Remarks

The CreateRemoteThread function causes a new thread of execution to begin in the address space of the specified process. The thread has access to all objects opened by the process.

The new thread handle is created with full access to the new thread. If a security descriptor is not provided, the handle may be used in any function that requires a thread object handle. When a security descriptor is provided, an access check is performed on all subsequent uses of the handle before access is granted. If the access check denies access, the requesting process cannot use the handle to gain access to the thread.

The thread execution begins at the function specified by the lpStartAddress parameter. If this function returns, the results are unspecified.

CreateRemoteThread may succeed even if lpStartAddress points to data, code, or is not accessible. If the start address is invalid when the thread runs, an exception occurs, and the thread terminates. Thread termination due to a invalid start address is handled as an error exit for the threadís process. This behavior is similar to the asynchronous nature of CreateProcess, where the process is created even if it refers to invalid or missing dynamic-link libraries (DLLs).

The thread is created with a thread priority of THREAD_PRIORITY_NORMAL. Use the GetThreadPriority and SetThreadPriority functions to get and set the priority value of a thread.

When a thread terminates, the thread object attains a signaled state, satisfying any threads that were waiting for the object.

The thread object remains in the system until the thread has terminated and all handles to it have been closed through a call to CloseHandle.

The ExitProcess, ExitThread, CreateThread, CreateRemoteThread functions, and a process that is starting (as the result of a CreateProcess call) are serialized between each other within a process. Only one of these events can happen in an address space at a time. This means the following restrictions hold:

See Also

CloseHandle, CreateProcess, CreateThread, ExitProcess, ExitThread, GetThreadPriority, ResumeThread, SECURITY_ATTRIBUTES, SetThreadPriority 

See also:


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