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GIO Reference Manual | |
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GSocketControlMessage; GSocketControlMessage * g_socket_control_message_deserialize (int level,int type,gsize size,gpointer data); int g_socket_control_message_get_level (GSocketControlMessage *message); int g_socket_control_message_get_msg_type (GSocketControlMessage *message); gsize g_socket_control_message_get_size (GSocketControlMessage *message); void g_socket_control_message_serialize (GSocketControlMessage *message,gpointer data);
A GSocketControlMessage is a special-purpose utility message that can be sent to or received from a GSocket. These types of messages are often called "ancillary data".
The message can represent some sort of special instruction to or information from the socket or can represent a special kind of transfer to the peer (for example, sending a file description over a UNIX socket).
These messages are sent with g_socket_send_message() and received
with g_socket_receive_message().
To extend the set of control message that can be sent, subclass this class and override the get_size, get_level, get_type and serialize methods.
To extend the set of control messages that can be received, subclass
this class and implement the deserialize method. Also, make sure your
class is registered with the GType typesystem before calling
g_socket_receive_message() to read such a message.
typedef struct _GSocketControlMessage GSocketControlMessage;
Base class for socket-type specific control messages that can be sent and received over GSocket.
GSocketControlMessage * g_socket_control_message_deserialize (int level,int type,gsize size,gpointer data);
Tries to deserialize a socket control message of a given
level and type. This will ask all known (to GType) subclasses
of GSocketControlMessage if they can understand this kind
of message and if so deserialize it into a GSocketControlMessage.
If there is no implementation for this kind of control message, NULL
will be returned.
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a socket level |
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a socket control message type for the given level
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the size of the data in bytes |
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pointer to the message data |
Returns : |
the deserialized message or NULL
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Since 2.22
int g_socket_control_message_get_level (GSocketControlMessage *message);
Returns the "level" (i.e. the originating protocol) of the control message. This is often SOL_SOCKET.
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a GSocketControlMessage |
Returns : |
an integer describing the level |
Since 2.22
int g_socket_control_message_get_msg_type
(GSocketControlMessage *message);
Returns the protocol specific type of the control message. For instance, for UNIX fd passing this would be SCM_RIGHTS.
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a GSocketControlMessage |
Returns : |
an integer describing the type of control message |
Since 2.22
gsize g_socket_control_message_get_size (GSocketControlMessage *message);
Returns the space required for the control message, not including headers or alignment.
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a GSocketControlMessage |
Returns : |
The number of bytes required. |
Since 2.22
void g_socket_control_message_serialize (GSocketControlMessage *message,gpointer data);
Converts the data in the message to bytes placed in the message.
data is guaranteed to have enough space to fit the size
returned by g_socket_control_message_get_size() on this
object.
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a GSocketControlMessage |
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A buffer to write data to |
Since 2.22