Remove the shim kernel crate

kernel/src/syscall/dup.rs

@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use super::SyscallReturn;
+use crate::{
+    fs::file_table::{FdFlags, FileDesc},
+    prelude::*,
+    process::ResourceType,
+};
+
+pub fn sys_dup(old_fd: FileDesc, ctx: &Context) -> Result<SyscallReturn> {
+    debug!("old_fd = {}", old_fd);
+
+    let mut file_table = ctx.process.file_table().lock();
+    let new_fd = file_table.dup(old_fd, 0, FdFlags::empty())?;
+
+    Ok(SyscallReturn::Return(new_fd as _))
+}
+
+pub fn sys_dup2(old_fd: FileDesc, new_fd: FileDesc, ctx: &Context) -> Result<SyscallReturn> {
+    debug!("old_fd = {}, new_fd = {}", old_fd, new_fd);
+
+    if old_fd == new_fd {
+        let file_table = ctx.process.file_table().lock();
+        let _ = file_table.get_file(old_fd)?;
+        return Ok(SyscallReturn::Return(new_fd as _));
+    }
+
+    do_dup3(old_fd, new_fd, FdFlags::empty(), ctx)
+}
+
+pub fn sys_dup3(
+    old_fd: FileDesc,
+    new_fd: FileDesc,
+    flags: u32,
+    ctx: &Context,
+) -> Result<SyscallReturn> {
+    debug!("old_fd = {}, new_fd = {}", old_fd, new_fd);
+
+    let fdflag = match flags {
+        0x0 => FdFlags::empty(),
+        0x80000 => FdFlags::CLOEXEC,
+        _ => return_errno_with_message!(Errno::EINVAL, "flags must be O_CLOEXEC or 0"),
+    };
+
+    do_dup3(old_fd, new_fd, fdflag, ctx)
+}
+
+fn do_dup3(
+    old_fd: FileDesc,
+    new_fd: FileDesc,
+    flags: FdFlags,
+    ctx: &Context,
+) -> Result<SyscallReturn> {
+    if old_fd == new_fd {
+        return_errno!(Errno::EINVAL);
+    }
+
+    let current = ctx.process;
+    if new_fd
+        >= current
+            .resource_limits()
+            .lock()
+            .get_rlimit(ResourceType::RLIMIT_NOFILE)
+            .get_cur() as FileDesc
+    {
+        return_errno!(Errno::EBADF);
+    }
+
+    let mut file_table = current.file_table().lock();
+    let _ = file_table.close_file(new_fd);
+    let new_fd = file_table.dup(old_fd, new_fd, flags)?;
+
+    Ok(SyscallReturn::Return(new_fd as _))
+}