Exit Codes Windows __link__ May 2026

These are STILL_ACTIVE (thread) and STATUS_PENDING (process). Seeing them from GetExitCodeProcess means you called it before the process actually exited. This is a classic race.

If your main() throws an uncaught C++ exception, the CRT catches it, calls terminate() , and then ExitProcess(3) . The code 3 means nothing about your logic—it simply signals "CRT abnormal termination." exit codes windows

This layering leads to a key insight: . The default for a thread is STATUS_THREAD_TERMINATED (0x00000100); for a process, it is STATUS_PENDING (0x00000103) until termination, then the final code. 2. The Semantic Wasteland: What Does Non-Zero Mean? Unlike Unix, where exit codes are small (0–255) and often mapped to sysexits.h conventions, Windows exit codes are full 32-bit values, blending several distinct categories: These are STILL_ACTIVE (thread) and STATUS_PENDING (process)

> err 0xC0000005 # for hex 0xc0000005 / decimal -1073741819 STATUS_ACCESS_VIOLATION Check against Win32 error codes: If your main() throws an uncaught C++ exception,

If yes, it's either an NTSTATUS (0xCxxxxxxx) or HRESULT (0x8xxxxxxx). Use the Visual Studio tool err.exe or net helpmsg :

In the seemingly sterile output of a command-line program—a lone integer returned to the operating system—lies a sophisticated, often misunderstood contract between a process and its caller. On Windows, this integer is the exit code (or "return code"), and while the convention 0 for success and non-zero for failure is universal, the depth beneath is uniquely shaped by Windows' architecture, its legacy subsystems, and the perils of cross-platform assumptions. 1. The Kernel's Handshake: How Exit Codes Really Work When a Windows process terminates—whether by returning from main() , calling ExitProcess() , or suffering an unhandled exception—the kernel records a 32-bit unsigned integer inside the EPROCESS block. This value persists until the process object is reaped by WaitForSingleObject() or GetExitCodeProcess() .

Crucially, the exit code is the return value of main() in the C runtime sense. The CRT wraps main() , captures its return value, and passes it to ExitProcess() . If you never call ExitProcess explicitly, the CRT does it for you.