Given a file descriptor, this returns an os.File [1] (it's analogous to a `FILE` from C-land). Which among other things, knows its name [2]. I guess it's hard to in a portable way go from a file descriptor to filename, so it's a parameter to `NewFile`.
Thanks. Indeed, it's not generally possible to go from a file descriptor to filename, because not all file descriptors refer to files with names (e.g. sockets). So I guess the second argument in this case is just a dummy value that is necessary because the Go library doesn't have a way to create a nameless "file" from a file descriptor.
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Given a file descriptor, this returns an os.File [1] (it's analogous to a `FILE` from C-land). Which among other things, knows its name [2]. I guess it's hard to in a portable way go from a file descriptor to filename, so it's a parameter to `NewFile`.
[1] http://golang.org/pkg/os/#File [2] http://golang.org/pkg/os/#File.Name
Thanks. Indeed, it's not generally possible to go from a file descriptor to filename, because not all file descriptors refer to files with names (e.g. sockets). So I guess the second argument in this case is just a dummy value that is necessary because the Go library doesn't have a way to create a nameless "file" from a file descriptor.