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22 lines
514 B
Go
22 lines
514 B
Go
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package fs
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import (
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"os"
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"golang.org/x/sys/unix"
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)
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// SetFlags tries to set the O_NOATIME flag on f, which prevents the kernel
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// from updating the atime on a read call.
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//
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// The call fails when we're not the owner of the file or root. The caller
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// should ignore the error, which is returned for testing only.
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func setFlags(f *os.File) error {
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fd := f.Fd()
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flags, err := unix.FcntlInt(fd, unix.F_GETFL, 0)
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if err == nil {
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_, err = unix.FcntlInt(fd, unix.F_SETFL, flags|unix.O_NOATIME)
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}
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return err
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}
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