Function sys_recv

components/lwp/lwp_syscall.c:5914–5936

* @brief Receives data from a connected socket. * * This system call is used to receive data from a socket that is in a connected state. * It supports various flags to modify the behavior of the receive operation. * * @param[in] socket The socket descriptor from which the data will be received. * The socket must be in a valid and connected state. * @param[out] mem

 * @see sys_send(), sys_recvfrom()
 */
sysret_t sys_recv(int socket, void *mem, size_t len, int flags)
{
    int flgs = 0;
    int ret;
    void *kmem = RT_NULL;

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

    kmem = kmem_get(sizeof(*kmem));
    if (kmem == RT_NULL)
    {
        return -ENOMEM;
    }

    flgs = netflags_muslc_2_lwip(flags);
    ret = recvfrom(socket, kmem, len, flgs, NULL, NULL);

    lwp_put_to_user((void *)mem, kmem, len);
    kmem_put(kmem);

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

/**
 * @brief Sends a message from a socket using scatter-gather I/O.