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nl: improve nl_sendto() docs and error checks

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Make nl_sendto() return NLE_INVAL if provided buffer is NULL
and make it return NLE_BAD_SOCK if the socket is not connected.

Add note in docs about lack of NL_CB_MSG_OUT invokation
This commit is contained in:
Thomas Graf 2012-11-06 17:48:28 +01:00
parent b25f26b896
commit 8f47501741
1 changed files with 27 additions and 5 deletions
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32
lib/nl.c
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@ -158,16 +158,38 @@ void nl_close(struct nl_sock *sk)
*/
/**
* Send raw data over netlink socket.
* @arg sk Netlink socket.
* @arg buf Data buffer.
* @arg size Size of data buffer.
* @return Number of characters written on success or a negative error code.
* Transmit raw data over netlink socket.
* @arg sk Netlink socket (required)
* @arg buf Buffer carrying data to send (required)
* @arg size Size of buffer (required)
*
* Transmits "raw" data over the specified netlink socket. Unlike the other
* transmit functions it does not modify the data in any way. It directly
* passes the buffer \c buf of \c size to sendto().
*
* The message is addressed to the peer as specified in the socket by either
* the nl_socket_set_peer_port() or nl_socket_set_peer_groups() function.
*
* @note Because there is no indication on the message boundaries of the data
* being sent, the \c NL_CB_MSG_OUT callback handler will not be invoked
* for data that is being sent using this function.
*
* @see nl_socket_set_peer_port()
* @see nl_socket_set_peer_groups()
* @see nl_sendmsg()
*
* @return Number of bytes sent or a negative error code.
*/
int nl_sendto(struct nl_sock *sk, void *buf, size_t size)
{
int ret;
if (!buf)
return -NLE_INVAL;
if (sk->s_fd < 0)
return -NLE_BAD_SOCK;
ret = sendto(sk->s_fd, buf, size, 0, (struct sockaddr *)
&sk->s_peer, sizeof(sk->s_peer));
if (ret < 0)