Win32 Thread Information Block
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In computing, the Win32 Thread Information Block (TIB) is a data structure in Win32 on x86 that stores info about the currently running thread. While officially undocumented, many Win32 programs use it so it is effectively a part of the API.
The TIB can be accessed as an offset of segment register FS.
| Position | Length | Windows Versions | Description |
|---|---|---|---|
| FS:[0x00] | 4 | Win9x and NT | Current Structured Exception Handling (SEH) frame |
| FS:[0x04] | 4 | Win9x and NT | Top of stack |
| FS:[0x08] | 4 | Win9x and NT | Current bottom of stack |
| FS:[0x10] | 4 | NT | Fiber data |
| FS:[0x14] | 4 | Win9x and NT | Arbitrary data slot |
| FS:[0x18] | 4 | Win9x and NT | Linear address of TIB |
| FS:[0x20] | 4 | NT | Process ID |
| FS:[0x24] | 4 | NT | Current thread ID |
| FS:[0x2C] | 4 | Win9x and NT | Linear address of the thread local storage array |
| FS:[0x34] | 4 | NT | Current error number |
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