Refactor project structure

kernel/aster-nix/src/syscall/write.rs

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use super::SyscallReturn;
+use crate::{
+    fs::file_table::FileDescripter, log_syscall_entry, prelude::*, syscall::SYS_WRITE,
+    util::read_bytes_from_user,
+};
+
+const STDOUT: u64 = 1;
+const STDERR: u64 = 2;
+
+pub fn sys_write(
+    fd: FileDescripter,
+    user_buf_ptr: Vaddr,
+    user_buf_len: usize,
+) -> Result<SyscallReturn> {
+    log_syscall_entry!(SYS_WRITE);
+    debug!(
+        "fd = {}, user_buf_ptr = 0x{:x}, user_buf_len = 0x{:x}",
+        fd, user_buf_ptr, user_buf_len
+    );
+
+    let current = current!();
+    let file_table = current.file_table().lock();
+    let file = file_table.get_file(fd)?;
+    if user_buf_len == 0 {
+        return Ok(SyscallReturn::Return(0));
+    }
+
+    let mut buffer = vec![0u8; user_buf_len];
+    read_bytes_from_user(user_buf_ptr, &mut buffer)?;
+    debug!("write content = {:?}", buffer);
+    let write_len = file.write(&buffer)?;
+    Ok(SyscallReturn::Return(write_len as _))
+}