@JKeita ..我 linux 测试没有你说的问题
linux 的就这么一段

// ReadOpen opens a file for reading only
func ReadOpen(path string) (*os.File, error) {
flag := os.O_RDONLY
perm := os.FileMode(0)
return os.OpenFile(path, flag, perm)
}，和 os.Open 一样的。


// Open opens the named file for reading. If successful, methods on
// the returned file can be used for reading; the associated file
// descriptor has mode O_RDONLY.
// If there is an error, it will be of type *PathError.
func Open(name string) (*File, error) {
return OpenFile(name, O_RDONLY, 0)
}