On Thu, Oct 11, 2018, at 18:48, Greg Saylor wrote:
> 1. Create a temporary file and squirrel away the file handle
> 2. Unlink the temporary file by name
> 3. Various functions would write stuff to the file
> 4. If the programs completes to some successful state, create a hardlink to
> the file handle with the final filename
The golang.org/x/sys/unix [1] package gives you a lower level interface that
might be familiar to you if you're used to using C. Something like this is
probably similar to what you were doing (though you'll need /proc mounted, I'm
not sure if there's a better way to do that):
oldfd, err := unix.Open(".", unix.O_TMPFILE|unix.O_RDWR,
unix.S_IRUSR|unix.S_IWUSR)
if err != nil {
panic(err)
}
f := os.NewFile(uintptr(oldfd), "myoldfile")
_, err = f.Write([]byte("Hello, World"))
if err != nil {
panic(err)
}
dir, err := os.Open(".")
if err != nil {
panic(err)
}
procdir, err := os.Open("/proc/self/fd/")
if err != nil {
panic(err)
}
err = unix.Linkat(int(procdir.Fd()), strconv.Itoa(oldfd),
int(dir.Fd()), "mynewfile", unix.AT_SYMLINK_FOLLOW)
if err != nil {
panic(err)
}
—Sam
[1]: https://godoc.org/golang.org/x/sys/unix
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