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Explain device IDs with a comment

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This commit is contained in:
Benjamin Sago 2021-04-11 23:34:29 +01:00
parent d19d66d57a
commit 311c9baf65
1 changed files with 8 additions and 3 deletions
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11
src/fs/file.rs
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@ -319,10 +319,15 @@ impl<'dir> File<'dir> {
f::Size::None
}
else if self.is_char_device() || self.is_block_device() {
let dev = self.metadata.rdev();
let device_ids = self.metadata.rdev().to_be_bytes();
// In C-land, getting the major and minor device IDs is done with
// preprocessor macros called `major` and `minor` that depend on
// the size of `dev_t`, but we just take the second-to-last and
// last bytes.
f::Size::DeviceIDs(f::DeviceIDs {
major: (dev / 256) as u8,
minor: (dev % 256) as u8,
major: device_ids[6],
minor: device_ids[7],
})
}
else {