Function sys_recvfrom

components/lwp/lwp_syscall.c:5814–5886

* @brief Receives data from a socket, optionally capturing the source address. * * This system call is used to receive data from a socket. For connectionless sockets, it also * retrieves the address of the sender. It supports both blocking and non-blocking operations * depending on the socket configuration and the specified flags. * * @param[in] socket The socket descriptor from which the

 * @see sys_sendto(), sys_recv()
 */
sysret_t sys_recvfrom(int socket, void *mem, size_t len, int flags,
      struct musl_sockaddr *from, socklen_t *fromlen)
{
    int flgs = 0;
#ifdef ARCH_MM_MMU
    int ret = -1;
    void *kmem = RT_NULL;
#endif

    flgs = netflags_muslc_2_lwip(flags);
#ifdef ARCH_MM_MMU
    if (!len)
    {
        return -EINVAL;
    }

    if (!lwp_user_accessable((void *)mem, len))
    {
        return -EFAULT;
    }

    kmem = kmem_get(len);
    if (!kmem)
    {
        return -ENOMEM;
    }

    if (flags == 0x2)
    {
        flags = 0x1;
    }

    if (from)
    {
        struct sockaddr sa;

        ret = recvfrom(socket, kmem, len, flgs, &sa, fromlen);
        sockaddr_tomusl(&sa, from);
    }
    else
    {
        ret = recvfrom(socket, kmem, len, flgs, NULL, NULL);
    }

    if (ret > 0)
    {
        lwp_put_to_user(mem, kmem, len);
    }

    if (ret < 0)
    {
        ret = GET_ERRNO();
    }

    kmem_put(kmem);

    return ret;
#else