Misleading comment?

[peter-mogensen]

I was wondering about the comment in line 529:
"// returns a dup(2) - FD_CLOEXEC flag not set"

Is that strictly correct? If I call syscall.Syscall to GETFD , the value is 1

Isn't what happens that .File() actually returns a os.File with an FD with FD_CLOEXEC set (using dupCloseOnExec() in net/fd_unix.go )
And then... when you call
cmd := exec.Command(path, args...)
err = cmd.Start()
... the Go stdlib clears CLOEXEC on the files you put in cmd.ExtraFiles as a part of forkAndExecInChild() when it shuffles file descriptors around ?