asterinas/services/libs/aster-std/src/syscall/sendto.rs

use crate::fs::file_table::FileDescripter;
use crate::log_syscall_entry;
use crate::net::socket::SendRecvFlags;
use crate::prelude::*;
use crate::util::net::{get_socket_from_fd, read_socket_addr_from_user};
use crate::util::read_bytes_from_user;

use super::{SyscallReturn, SYS_SENDTO};

pub fn sys_sendto(
    sockfd: FileDescripter,
    buf: Vaddr,
    len: usize,
    flags: i32,
    dest_addr: Vaddr,
    addrlen: usize,
) -> Result<SyscallReturn> {
    log_syscall_entry!(SYS_SENDTO);
    let flags = SendRecvFlags::from_bits_truncate(flags);
    let socket_addr = if dest_addr == 0 {
        None
    } else {
        let socket_addr = read_socket_addr_from_user(dest_addr, addrlen)?;
        Some(socket_addr)
    };
    debug!("sockfd = {sockfd}, buf = 0x{buf:x}, len = 0x{len:x}, flags = {flags:?}, socket_addr = {socket_addr:?}");
    let mut buffer = vec![0u8; len];
    read_bytes_from_user(buf, &mut buffer)?;

    let socket = get_socket_from_fd(sockfd)?;

    let send_size = socket.sendto(&buffer, socket_addr, flags)?;

    Ok(SyscallReturn::Return(send_size as _))
}