const runtime._O_NONBLOCK 2 uses runtime (current package) defs_linux_amd64.go#L172: _O_NONBLOCK = 0x800 nbpipe_pipe2.go#L10: return pipe2(_O_NONBLOCK | _O_CLOEXEC)
The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)