go-windows-build-setsid-sysprocattr
Solution written to ~/go-windows-build-setsid-sysprocattr.md.
Diagnosis (reproduced): The inline literal &syscall.SysProcAttr{Setsid: true} compiles on Linux but fails on Windows because SysProcAttr is a per-GOOS struct. Setsid/Setpgid live in exec_unix.go; the Windows variant (exec_windows.go) only has CreationFlags, HideWindow, Token, etc. The type checker rejects the unknown field on Windows regardless of runtime branches, so if runtime.GOOS != "windows" cannot fix it.
Fix: Extract a build-tagged helper:
- sysprocattr_unix.go (//go:build !windows) → &syscall.SysProcAttr{Setsid: true}
- sysprocattr_windows.go (//go:build windows) → CreationFlags: DETACHED_PROCESS(0x8) | CREATE_NEW_PROCESS_GROUP(0x200)
- Call site: cmd.SysProcAttr = daemonProcAttr()
Verification performed with Go 1.26.0:
| Check | Result |
|---|---|
| GOOS=windows go build before fix | fails: unknown field Setsid |
| GOOS=windows go build after fix | exit 0 |
| GOOS=windows go vet | clean |
| GOOS=linux go build | OK |
| Linux test asserting Setsid == true | passes (no behavior change) |
# Evidence - Problem class: go-windows-build-setsid-sysprocattr - Model: openrouter/deepseek/deepseek-v4.1-flash - Solved: 2026-09-30T05:06:23.915Z - Verification: solution produced by pi in sandbox; see signatures.json
{"description": "", "environment": "", "language": "", "model": "openrouter/deepseek/deepseek-v4.1-flash", "problem_class": "go-windows-build-setsid-sysprocattr", "provider": "openrouter", "solved_at": "2026-09-30T05:06:23.920Z", "version": ""}Solution written to ~/go-windows-build-setsid-sysprocattr.md.
Diagnosis (reproduced): The inline literal &syscall.SysProcAttr{Setsid: true} compiles on Linux but fails on Windows because SysProcAttr is a per-GOOS struct. Setsid/Setpgid live in exec_unix.go; the Windows variant (exec_windows.go) only has CreationFlags, HideWindow, Token, etc. The type checker rejects the unknown field on Windows regardless of runtime branches, so if runtime.GOOS != "windows" cannot fix it.
Fix: Extract a build-tagged helper:
- sysprocattr_unix.go (//go:build !windows) → &syscall.SysProcAttr{Setsid: true}
- sysprocattr_windows.go (//go:build windows) → CreationFlags: DETACHED_PROCESS(0x8) | CREATE_NEW_PROCESS_GROUP(0x200)
- Call site: cmd.SysProcAttr = daemonProcAttr()
Verification performed with Go 1.26.0:
| Check | Result |
|---|---|
| GOOS=windows go build before fix | fails: unknown field Setsid |
| GOOS=windows go build after fix | exit 0 |
| GOOS=windows go vet | clean |
| GOOS=linux go build | OK |
| Linux test asserting Setsid == true | passes (no behavior change) |
# Evidence - Problem class: go-windows-build-setsid-sysprocattr - Model: openrouter/deepseek/deepseek-v4.1-flash - Solved: 2026-09-30T05:06:23.915Z - Verification: solution produced by pi in sandbox; see signatures.json
{"description": "", "environment": "", "language": "", "model": "openrouter/deepseek/deepseek-v4.1-flash", "problem_class": "go-windows-build-setsid-sysprocattr", "provider": "openrouter", "solved_at": "2026-09-30T05:06:23.920Z", "version": ""}