Jeremy Soller
61 lines
1.4 KiB
Rust
61 lines
1.4 KiB
Rust
use syscall::error::*;
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use syscall::scheme::Scheme;
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use std::cmp;
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pub struct ZeroScheme;
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impl Scheme for ZeroScheme {
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fn open(&self, _path: &str, _flags: usize, _uid: u32, _gid: u32) -> Result<usize> {
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Ok(0)
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}
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fn dup(&self, _file: usize, buf: &[u8]) -> Result<usize> {
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if ! buf.is_empty() {
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return Err(Error::new(EINVAL));
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}
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Ok(0)
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}
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/// Read the file `number` into the `buffer`
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///
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/// Returns the number of bytes read
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fn read(&self, _file: usize, buf: &mut [u8]) -> Result<usize> {
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let size = buf.len();
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buf[..size].iter_mut().for_each(|val| *val = 0);
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Ok(size)
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}
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/// Write the `buffer` to the `file`
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///
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/// Returns the number of bytes written
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fn write(&self, _file: usize, buffer: &[u8]) -> Result<usize> {
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Ok(buffer.len())
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}
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fn fcntl(&self, _id: usize, _cmd: usize, _arg: usize) -> Result<usize> {
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Ok(0)
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}
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fn fpath(&self, _id: usize, buf: &mut [u8]) -> Result<usize> {
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let scheme_path = b"zero:";
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let size = cmp::min(buf.len(), scheme_path.len());
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buf[..size].copy_from_slice(&scheme_path[..size]);
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Ok(size)
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}
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fn fsync(&self, _file: usize) -> Result<usize> {
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Ok(0)
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}
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/// Close the file `number`
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fn close(&self, _file: usize) -> Result<usize> {
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Ok(0)
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}
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}
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