Function sys_sendto

components/lwp/lwp_syscall.c:6050–6114

* @brief Sends data to a specific address using a socket. * * This system call is used to send data from a socket to a specified address. It is commonly * used with connectionless sockets (e.g., UDP) but can also be used with connection-oriented * sockets if the destination address needs to be overridden. * * @param[in] socket The socket descriptor used for sending data. It must be valid a

 * @see sys_send(), sys_sendmsg(), sys_recvfrom()
 */
sysret_t sys_sendto(int socket, const void *dataptr, size_t size, int flags,
    const struct musl_sockaddr *to, socklen_t tolen)
{
    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 (!size)
    {
        return -EINVAL;
    }

    if (!lwp_user_accessable((void *)dataptr, size))
    {
        return -EFAULT;
    }

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

    lwp_get_from_user(kmem, (void *)dataptr, size);

    if (to)
    {
        struct sockaddr sa;
        sockaddr_tolwip(to, &sa);

        ret = sendto(socket, kmem, size, flgs, &sa, tolen);
    }
    else
    {
        ret = sendto(socket, kmem, size, flgs, NULL, tolen);
    }

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

    kmem_put(kmem);

    return ret;
#else
    int ret;
    if (to)
    {
        struct sockaddr sa;
        sockaddr_tolwip(to, &sa);

        ret = sendto(socket, dataptr, size, flgs, &sa, tolen);
    }