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@ -10,6 +10,8 @@ use crate::fs::*;
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use crate::memory::MemorySet;
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use crate::sync::Condvar;
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use bitvec::{BitSlice, BitVec, LittleEndian};
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use super::*;
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pub fn sys_read(fd: usize, base: *mut u8, len: usize) -> SysResult {
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@ -160,30 +162,30 @@ pub fn sys_select(
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loop {
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let proc = process();
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let mut events = 0;
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for (fd, file_like) in proc.files.iter() {
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if *fd < nfds {
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for (&fd, file_like) in proc.files.iter() {
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if fd < nfds {
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match file_like {
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FileLike::File(_) => {
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// FIXME: assume it is stdin for now
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if STDIN.can_read() {
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if read_fds.is_set(*fd) {
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read_fds.set(*fd);
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if read_fds.contains(fd) {
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read_fds.set(fd);
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events = events + 1;
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}
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}
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}
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FileLike::Socket(socket) => {
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let (input, output, err) = socket.poll();
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if err && err_fds.is_set(*fd) {
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err_fds.set(*fd);
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if err && err_fds.contains(fd) {
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err_fds.set(fd);
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events = events + 1;
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}
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if input && read_fds.is_set(*fd) {
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read_fds.set(*fd);
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if input && read_fds.contains(fd) {
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read_fds.set(fd);
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events = events + 1;
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}
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if output && write_fds.is_set(*fd) {
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write_fds.set(*fd);
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if output && write_fds.contains(fd) {
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write_fds.set(fd);
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events = events + 1;
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}
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}
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@ -1172,54 +1174,51 @@ const FD_PER_ITEM: usize = 8 * size_of::<u32>();
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const MAX_FDSET_SIZE: usize = 1024 / FD_PER_ITEM;
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struct FdSet {
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addr: *mut u32,
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nfds: usize,
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saved: [u32; MAX_FDSET_SIZE],
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bitset: &'static mut BitSlice<LittleEndian, u32>,
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origin: BitVec<LittleEndian, u32>,
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}
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impl FdSet {
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/// Initialize a `FdSet` from pointer and number of fds
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/// Check if the array is large enough
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fn new(vm: &MemorySet, addr: *mut u32, nfds: usize) -> Result<FdSet, SysError> {
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let mut saved = [0u32; MAX_FDSET_SIZE];
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if addr as usize != 0 {
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if addr.is_null() {
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Ok(FdSet {
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bitset: BitSlice::empty_mut(),
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origin: BitVec::new(),
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})
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} else {
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let len = (nfds + FD_PER_ITEM - 1) / FD_PER_ITEM;
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vm.check_write_array(addr, len)?;
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if len > MAX_FDSET_SIZE {
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return Err(SysError::EINVAL);
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}
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let slice = unsafe { slice::from_raw_parts_mut(addr, len) };
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let bitset: &'static mut BitSlice<LittleEndian, u32> = slice.into();
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// save the fdset, and clear it
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for i in 0..len {
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saved[i] = slice[i];
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slice[i] = 0;
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}
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use alloc::prelude::ToOwned;
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let origin = bitset.to_owned();
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bitset.set_all(false);
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Ok(FdSet { bitset, origin })
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}
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Ok(FdSet { addr, nfds, saved })
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}
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/// Try to set fd in `FdSet`
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/// Return true when `FdSet` is valid, and false when `FdSet` is bad (i.e. null pointer)
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/// Fd should be less than nfds
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fn set(&mut self, fd: usize) -> bool {
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if self.addr as usize != 0 {
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assert!(fd < self.nfds);
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unsafe {
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*self.addr.add(fd / 8 / size_of::<u32>()) |= 1 << (fd % (8 * size_of::<u32>()));
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}
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true
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} else {
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false
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if self.bitset.is_empty() {
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return false;
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}
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self.bitset.set(fd, true);
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true
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}
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/// Check to see fd is see in original `FdSet`
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/// Check to see whether `fd` is in original `FdSet`
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/// Fd should be less than nfds
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fn is_set(&mut self, fd: usize) -> bool {
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assert!(fd < self.nfds);
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self.saved[fd / 8 / size_of::<u32>()] & (1 << (fd % (8 * size_of::<u32>()))) != 0
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fn contains(&self, fd: usize) -> bool {
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self.origin[fd]
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}
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}
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WangRunji
6 years ago