248 lines
7.4 KiB
Rust
248 lines
7.4 KiB
Rust
//! Filesystem syscalls
|
|
|
|
use context;
|
|
use scheme;
|
|
use syscall::data::Stat;
|
|
use syscall::error::*;
|
|
|
|
/// Change the current working directory
|
|
pub fn chdir(path: &[u8]) -> Result<usize> {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
let canonical = context.canonicalize(path);
|
|
*context.cwd.lock() = canonical;
|
|
Ok(0)
|
|
}
|
|
|
|
/// Get the current working directory
|
|
pub fn getcwd(buf: &mut [u8]) -> Result<usize> {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
let cwd = context.cwd.lock();
|
|
let mut i = 0;
|
|
while i < buf.len() && i < cwd.len() {
|
|
buf[i] = cwd[i];
|
|
i += 1;
|
|
}
|
|
Ok(i)
|
|
}
|
|
|
|
/// Open syscall
|
|
pub fn open(path: &[u8], flags: usize) -> Result<usize> {
|
|
let path_canon = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
context.canonicalize(path)
|
|
};
|
|
|
|
let mut parts = path_canon.splitn(2, |&b| b == b':');
|
|
let namespace_opt = parts.next();
|
|
let reference_opt = parts.next();
|
|
|
|
let (scheme_id, file_id) = {
|
|
let namespace = namespace_opt.ok_or(Error::new(ENOENT))?;
|
|
let (scheme_id, scheme) = {
|
|
let schemes = scheme::schemes();
|
|
let (scheme_id, scheme) = schemes.get_name(namespace).ok_or(Error::new(ENOENT))?;
|
|
(scheme_id, scheme.clone())
|
|
};
|
|
let file_id = scheme.open(reference_opt.unwrap_or(b""), flags)?;
|
|
(scheme_id, file_id)
|
|
};
|
|
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
context.add_file(::context::file::File {
|
|
scheme: scheme_id,
|
|
number: file_id
|
|
}).ok_or(Error::new(EMFILE))
|
|
}
|
|
|
|
/// Close syscall
|
|
pub fn close(fd: usize) -> Result<usize> {
|
|
let file = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
let file = context.remove_file(fd).ok_or(Error::new(EBADF))?;
|
|
file
|
|
};
|
|
|
|
context::event::unregister(fd, file.scheme, file.number);
|
|
|
|
let scheme = {
|
|
let schemes = scheme::schemes();
|
|
let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
|
|
scheme.clone()
|
|
};
|
|
scheme.close(file.number)
|
|
}
|
|
|
|
/// Duplicate file descriptor
|
|
pub fn dup(fd: usize) -> Result<usize> {
|
|
let file = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
let file = context.get_file(fd).ok_or(Error::new(EBADF))?;
|
|
file
|
|
};
|
|
|
|
let scheme = {
|
|
let schemes = scheme::schemes();
|
|
let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
|
|
scheme.clone()
|
|
};
|
|
scheme.dup(file.number)
|
|
}
|
|
|
|
/// Register events for file
|
|
pub fn fevent(fd: usize, flags: usize) -> Result<usize> {
|
|
let file = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
let file = context.get_file(fd).ok_or(Error::new(EBADF))?;
|
|
file
|
|
};
|
|
|
|
let scheme = {
|
|
let schemes = scheme::schemes();
|
|
let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
|
|
scheme.clone()
|
|
};
|
|
scheme.fevent(file.number, flags)?;
|
|
context::event::register(fd, file.scheme, file.number);
|
|
Ok(0)
|
|
}
|
|
|
|
/// Get the canonical path of the file
|
|
pub fn fpath(fd: usize, buf: &mut [u8]) -> Result<usize> {
|
|
let file = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
let file = context.get_file(fd).ok_or(Error::new(EBADF))?;
|
|
file
|
|
};
|
|
|
|
let scheme = {
|
|
let schemes = scheme::schemes();
|
|
let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
|
|
scheme.clone()
|
|
};
|
|
scheme.fpath(file.number, buf)
|
|
}
|
|
|
|
/// Get information about the file
|
|
pub fn fstat(fd: usize, stat: &mut Stat) -> Result<usize> {
|
|
let file = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
let file = context.get_file(fd).ok_or(Error::new(EBADF))?;
|
|
file
|
|
};
|
|
|
|
let scheme = {
|
|
let schemes = scheme::schemes();
|
|
let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
|
|
scheme.clone()
|
|
};
|
|
scheme.fstat(file.number, stat)
|
|
}
|
|
|
|
/// Sync the file descriptor
|
|
pub fn fsync(fd: usize) -> Result<usize> {
|
|
let file = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
let file = context.get_file(fd).ok_or(Error::new(EBADF))?;
|
|
file
|
|
};
|
|
|
|
let scheme = {
|
|
let schemes = scheme::schemes();
|
|
let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
|
|
scheme.clone()
|
|
};
|
|
scheme.fsync(file.number)
|
|
}
|
|
|
|
/// Truncate the file descriptor
|
|
pub fn ftruncate(fd: usize, len: usize) -> Result<usize> {
|
|
let file = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
let file = context.get_file(fd).ok_or(Error::new(EBADF))?;
|
|
file
|
|
};
|
|
|
|
let scheme = {
|
|
let schemes = scheme::schemes();
|
|
let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
|
|
scheme.clone()
|
|
};
|
|
scheme.ftruncate(file.number, len)
|
|
}
|
|
|
|
/// Seek to an offset
|
|
pub fn lseek(fd: usize, pos: usize, whence: usize) -> Result<usize> {
|
|
let file = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
let file = context.get_file(fd).ok_or(Error::new(EBADF))?;
|
|
file
|
|
};
|
|
|
|
let scheme = {
|
|
let schemes = scheme::schemes();
|
|
let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
|
|
scheme.clone()
|
|
};
|
|
scheme.seek(file.number, pos, whence)
|
|
}
|
|
|
|
/// Read syscall
|
|
pub fn read(fd: usize, buf: &mut [u8]) -> Result<usize> {
|
|
let file = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
let file = context.get_file(fd).ok_or(Error::new(EBADF))?;
|
|
file
|
|
};
|
|
|
|
let scheme = {
|
|
let schemes = scheme::schemes();
|
|
let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
|
|
scheme.clone()
|
|
};
|
|
scheme.read(file.number, buf)
|
|
}
|
|
|
|
/// Write syscall
|
|
pub fn write(fd: usize, buf: &[u8]) -> Result<usize> {
|
|
let file = {
|
|
let contexts = context::contexts();
|
|
let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
|
|
let context = context_lock.read();
|
|
let file = context.get_file(fd).ok_or(Error::new(EBADF))?;
|
|
file
|
|
};
|
|
|
|
let scheme = {
|
|
let schemes = scheme::schemes();
|
|
let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
|
|
scheme.clone()
|
|
};
|
|
scheme.write(file.number, buf)
|
|
}
|