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Encode many of the file syscalls

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This commit is contained in:
Jeremy Soller 2016-09-25 11:20:59 -06:00
parent 0e8487cf83
commit 549fe53bc3
5 changed files with 131 additions and 194 deletions
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186
kernel/syscall/fs.rs
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@ -2,9 +2,45 @@
use context;
use scheme;
use syscall::data::Stat;
use syscall::data::{Packet, Stat};
use syscall::error::*;
pub fn file_op(a: usize, fd: usize, c: usize, d: 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()
};
let mut packet = Packet {
id: 0,
a: a,
b: file.number,
c: c,
d: d
};
scheme.handle(&mut packet);
Error::demux(packet.a)
}
pub fn file_op_slice(a: usize, fd: usize, slice: &[u8]) -> Result<usize> {
file_op(a, fd, slice.as_ptr() as usize, slice.len())
}
pub fn file_op_mut_slice(a: usize, fd: usize, slice: &mut [u8]) -> Result<usize> {
file_op(a, fd, slice.as_mut_ptr() as usize, slice.len())
}
/// Change the current working directory
pub fn chdir(path: &[u8]) -> Result<usize> {
let contexts = context::contexts();
@ -92,12 +128,22 @@ pub fn dup(fd: usize) -> Result<usize> {
file
};
let scheme = {
let schemes = scheme::schemes();
let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
scheme.clone()
};
scheme.dup(file.number)
let file_id = {
let scheme = {
let schemes = scheme::schemes();
let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
scheme.clone()
};
scheme.dup(file.number)
}?;
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: file.scheme,
number: file_id
}).ok_or(Error::new(EMFILE))
}
/// Register events for file
@ -119,129 +165,3 @@ pub fn fevent(fd: usize, flags: usize) -> Result<usize> {
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)
}