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@ -2,6 +2,8 @@
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use super::*;
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use crate::fs::{ROOT_INODE, OpenOptions};
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pub fn sys_read(fd: usize, base: *mut u8, len: usize) -> SysResult {
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info!("read: fd: {}, base: {:?}, len: {:#x}", fd, base, len);
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let mut proc = process();
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@ -24,22 +26,44 @@ pub fn sys_write(fd: usize, base: *const u8, len: usize) -> SysResult {
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Ok(len as isize)
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}
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pub fn sys_open(path: *const u8, flags: usize) -> SysResult {
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pub fn sys_open(path: *const u8, flags: usize, mode: usize) -> SysResult {
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let mut proc = process();
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let path = unsafe { proc.memory_set.check_and_clone_cstr(path) }
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.ok_or(SysError::Inval)?;
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let flags = VfsFlags::from_ucore_flags(flags);
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info!("open: path: {:?}, flags: {:?}", path, flags);
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let (fd, inode) = match path.as_str() {
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"stdin:" => (0, crate::fs::STDIN.clone() as Arc<INode>),
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"stdout:" => (1, crate::fs::STDOUT.clone() as Arc<INode>),
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_ => {
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let fd = (3..).find(|i| !proc.files.contains_key(i)).unwrap();
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let inode = crate::fs::ROOT_INODE.lookup(path.as_str())?;
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(fd, inode)
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let flags = OpenFlags::from_bits_truncate(flags);
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info!("open: path: {:?}, flags: {:?}, mode: {:#o}", path, flags, mode);
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let inode =
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if flags.contains(OpenFlags::CREATE) {
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// FIXME: assume path start from root now
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let mut split = path.as_str().rsplitn(2, '/');
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let file_name = split.next().unwrap();
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let dir_path = split.next().unwrap_or(".");
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let dir_inode = ROOT_INODE.lookup(dir_path)?;
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match dir_inode.find(file_name) {
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Ok(file_inode) => {
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if flags.contains(OpenFlags::EXCLUSIVE) {
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return Err(SysError::Exists);
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}
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file_inode
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},
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Err(FsError::EntryNotFound) => {
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dir_inode.create(file_name, FileType::File, mode as u32)?
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}
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Err(e) => return Err(SysError::from(e)),
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}
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} else {
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// TODO: remove "stdin:" "stdout:"
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match path.as_str() {
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"stdin:" => crate::fs::STDIN.clone() as Arc<INode>,
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"stdout:" => crate::fs::STDOUT.clone() as Arc<INode>,
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_ => ROOT_INODE.lookup(path.as_str())?,
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}
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};
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let file = File::new(inode, flags.contains(VfsFlags::READABLE), flags.contains(VfsFlags::WRITABLE));
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let fd = (3..).find(|i| !proc.files.contains_key(i)).unwrap();
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let file = FileHandle::new(inode, flags.to_options());
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proc.files.insert(fd, file);
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Ok(fd as isize)
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}
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@ -98,30 +122,44 @@ pub fn sys_dup2(fd1: usize, fd2: usize) -> SysResult {
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Ok(0)
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}
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fn get_file<'a>(proc: &'a mut MutexGuard<'static, Process>, fd: usize) -> Result<&'a mut File, SysError> {
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fn get_file<'a>(proc: &'a mut MutexGuard<'static, Process>, fd: usize) -> Result<&'a mut FileHandle, SysError> {
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proc.files.get_mut(&fd).ok_or(SysError::Inval)
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}
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bitflags! {
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struct VfsFlags: usize {
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// WARNING: different from origin uCore
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const READABLE = 1 << 0;
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const WRITABLE = 1 << 1;
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struct OpenFlags: usize {
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/// read only
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const RDONLY = 0;
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/// write only
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const WRONLY = 1;
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/// read write
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const RDWR = 2;
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/// create file if it does not exist
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const CREATE = 1 << 2;
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/// error if O_CREAT and the file exists
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const EXCLUSIVE = 1 << 3;
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const CREATE = 1 << 6;
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/// error if CREATE and the file exists
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const EXCLUSIVE = 1 << 7;
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/// truncate file upon open
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const TRUNCATE = 1 << 4;
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const TRUNCATE = 1 << 9;
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/// append on each write
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const APPEND = 1 << 5;
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const APPEND = 1 << 10;
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}
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}
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impl VfsFlags {
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fn from_ucore_flags(f: usize) -> Self {
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assert_ne!(f & 0b11, 0b11);
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Self::from_bits_truncate(f + 1)
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impl OpenFlags {
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fn readable(&self) -> bool {
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let b = self.bits() & 0b11;
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b == OpenFlags::RDONLY.bits() || b == OpenFlags::RDWR.bits()
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}
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fn writable(&self) -> bool {
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let b = self.bits() & 0b11;
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b == OpenFlags::WRONLY.bits() || b == OpenFlags::RDWR.bits()
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}
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fn to_options(&self) -> OpenOptions {
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OpenOptions {
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read: self.readable(),
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write: self.writable(),
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append: self.contains(OpenFlags::APPEND),
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}
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}
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}
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WangRunji
6 years ago