Refactor project structure

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

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use super::{SyscallReturn, SYS_RECVFROM};
+use crate::{
+    fs::file_table::FileDescripter,
+    log_syscall_entry,
+    net::socket::SendRecvFlags,
+    prelude::*,
+    util::{
+        net::{get_socket_from_fd, write_socket_addr_to_user},
+        write_bytes_to_user,
+    },
+};
+
+pub fn sys_recvfrom(
+    sockfd: FileDescripter,
+    buf: Vaddr,
+    len: usize,
+    flags: i32,
+    src_addr: Vaddr,
+    addrlen_ptr: Vaddr,
+) -> Result<SyscallReturn> {
+    log_syscall_entry!(SYS_RECVFROM);
+    let flags = SendRecvFlags::from_bits_truncate(flags);
+    debug!("sockfd = {sockfd}, buf = 0x{buf:x}, len = {len}, flags = {flags:?}, src_addr = 0x{src_addr:x}, addrlen_ptr = 0x{addrlen_ptr:x}");
+
+    let socket = get_socket_from_fd(sockfd)?;
+
+    let mut buffer = vec![0u8; len];
+
+    let (recv_size, socket_addr) = socket.recvfrom(&mut buffer, flags)?;
+    if buf != 0 {
+        write_bytes_to_user(buf, &buffer[..recv_size])?;
+    }
+    if src_addr != 0 {
+        write_socket_addr_to_user(&socket_addr, src_addr, addrlen_ptr)?;
+    }
+    Ok(SyscallReturn::Return(recv_size as _))
+}