const runtime._O_CLOEXEC 2 uses runtime (current package) defs_linux_amd64.go#L173: _O_CLOEXEC = 0x80000 nbpipe_pipe2.go#L10: return pipe2(_O_NONBLOCK | _O_CLOEXEC)
The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)