Function sys_send

components/lwp/lwp_syscall.c:6142–6169

* @brief Sends data over a connected socket. * * This system call sends data from the specified buffer through a connected socket. It is typically * used with connection-oriented sockets (e.g., TCP) but can also work with connectionless sockets * (e.g., UDP) if a connection is established using `sys_connect()`. * * @param[in] socket The socket descriptor used for sending data. It must be a

 * @see sys_sendto(), sys_sendmsg(), sys_recv()
 */
sysret_t sys_send(int socket, const void *dataptr, size_t size, int flags)
{
    int flgs = 0;
    int ret = 0;
    void *kdataptr = RT_NULL;

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

    kdataptr = kmem_get(size);
    if (kdataptr == RT_NULL)
    {
        return -ENOMEM;
    }

    if (lwp_get_from_user(kdataptr, (void *)dataptr, size) != size)
    {
        kmem_put(kdataptr);
        return -EINVAL;
    }

    flgs = netflags_muslc_2_lwip(flags);
    ret = sendto(socket, kdataptr, size, flgs, NULL, 0);

    kmem_put(kdataptr);

    return (ret < 0 ? GET_ERRNO() : ret);
}

/**
 * @brief Creates a new socket for communication.