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* Copyright (c) 2008-2009 Brent Fulgham <>. All rights reserved.
* This source code is a modified version of the CoreFoundation sources released by Apple Inc. under
* the terms of the APSL version 2.0 (see below).
* For information about changes from the original Apple source release can be found by reviewing the
* source control system for the project at
* The original license information is as follows:
* Copyright (c) 2008 Apple Inc. All rights reserved.
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* and read it before using this
* file.
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* Please see the License for the specific language governing rights and
* limitations under the License.
/* CFSocket.h
Copyright (c) 1999-2007, Apple Inc. All rights reserved.
#ifdef WIN32
// Avoid actually including <winsock2.h>, as it can screw up lots of data type definitions
typedef unsigned int CFSocketNativeHandle;
typedef int CFSocketNativeHandle;
#include <CoreFoundation/CFRunLoop.h>
#include <CoreFoundation/CFData.h>
typedef struct __CFSocket * CFSocketRef;
/* A CFSocket contains a native socket within a structure that can
be used to read from the socket in the background and make the data
thus read available using a runloop source. The callback used for
this may be of three types, as specified by the callBackTypes
argument when creating the CFSocket.
If kCFSocketReadCallBack is used, then data will not be
automatically read, but the callback will be called when data
is available to be read, or a new child socket is waiting to be
If kCFSocketAcceptCallBack is used, then new child sockets will be
accepted and passed to the callback, with the data argument being
a pointer to a CFSocketNativeHandle. This is usable only with
connection rendezvous sockets.
If kCFSocketDataCallBack is used, then data will be read in chunks
in the background and passed to the callback, with the data argument
being a CFDataRef.
These three types are mutually exclusive, but any one of them may
have kCFSocketConnectCallBack added to it, if the socket will be
used to connect in the background. Connect in the background occurs
if CFSocketConnectToAddress is called with a negative timeout
value, in which case the call returns immediately, and a
kCFSocketConnectCallBack is generated when the connect finishes.
In this case the data argument is either NULL, or a pointer to
an SInt32 error code if the connect failed. kCFSocketConnectCallBack
will never be sent more than once for a given socket.
The callback types may also have kCFSocketWriteCallBack added to
them, if large amounts of data are to be sent rapidly over the
socket and notification is desired when there is space in the
kernel buffers so that the socket is writable again.
With a connection-oriented socket, if the connection is broken from the
other end, then one final kCFSocketReadCallBack or kCFSocketDataCallBack
will occur. In the case of kCFSocketReadCallBack, the underlying socket
will have 0 bytes available to read. In the case of kCFSocketDataCallBack,
the data argument will be a CFDataRef of length 0.
There are socket flags that may be set to control whether callbacks of
a given type are automatically reenabled after they are triggered, and
whether the underlying native socket will be closed when the CFSocket
is invalidated. By default read, accept, and data callbacks are
automatically reenabled; write callbacks are not, and connect callbacks
may not be, since they are sent once only. Be careful about automatically
reenabling read and write callbacks, since this implies that the
callbacks will be sent repeatedly if the socket remains readable or
writable respectively. Be sure to set these flags only for callbacks
that your CFSocket actually possesses; the result of setting them for
other callback types is undefined.
Individual callbacks may also be enabled and disabled manually, whether
they are automatically reenabled or not. If they are not automatically
reenabled, then they will need to be manually reenabled when the callback
is ready to be received again (and not sooner). Even if they are
automatically reenabled, there may be occasions when it will be useful
to be able to manually disable them temporarily and then reenable them.
Be sure to enable and disable only callbacks that your CFSocket actually
possesses; the result of enabling and disabling other callback types is
By default the underlying native socket will be closed when the CFSocket
is invalidated, but it will not be if kCFSocketCloseOnInvalidate is
turned off. This can be useful in order to destroy a CFSocket but
continue to use the underlying native socket. The CFSocket must
still be invalidated when it will no longer be used. Do not in
either case close the underlying native socket without invalidating
the CFSocket.
Addresses are stored as CFDatas containing a struct sockaddr
appropriate for the protocol family; make sure that all fields are
filled in properly when passing in an address.
/* Values for CFSocketError */
enum {
kCFSocketSuccess = 0,
kCFSocketError = -1,
kCFSocketTimeout = -2
typedef CFIndex CFSocketError;
typedef struct {
SInt32 protocolFamily;
SInt32 socketType;
SInt32 protocol;
CFDataRef address;
} CFSocketSignature;
/* Values for CFSocketCallBackType */
enum {
kCFSocketNoCallBack = 0,
kCFSocketReadCallBack = 1,
kCFSocketAcceptCallBack = 2,
kCFSocketDataCallBack = 3,
kCFSocketConnectCallBack = 4
kCFSocketWriteCallBack = 8
typedef CFOptionFlags CFSocketCallBackType;
/* Socket flags */
enum {
kCFSocketAutomaticallyReenableReadCallBack = 1,
kCFSocketAutomaticallyReenableAcceptCallBack = 2,
kCFSocketAutomaticallyReenableDataCallBack = 3,
kCFSocketAutomaticallyReenableWriteCallBack = 8,
kCFSocketCloseOnInvalidate = 128
typedef void (*CFSocketCallBack)(CFSocketRef s, CFSocketCallBackType type, CFDataRef address, const void *data, void *info);
/* If the callback wishes to keep hold of address or data after the point that it returns, then it must copy them. */
typedef struct {
CFIndex version;
void * info;
const void *(*retain)(const void *info);
void (*release)(const void *info);
CFStringRef (*copyDescription)(const void *info);
} CFSocketContext;
CF_EXPORT CFTypeID CFSocketGetTypeID(void);
CF_EXPORT CFSocketRef CFSocketCreate(CFAllocatorRef allocator, SInt32 protocolFamily, SInt32 socketType, SInt32 protocol, CFOptionFlags callBackTypes, CFSocketCallBack callout, const CFSocketContext *context);
CF_EXPORT CFSocketRef CFSocketCreateWithNative(CFAllocatorRef allocator, CFSocketNativeHandle sock, CFOptionFlags callBackTypes, CFSocketCallBack callout, const CFSocketContext *context);
CF_EXPORT CFSocketRef CFSocketCreateWithSocketSignature(CFAllocatorRef allocator, const CFSocketSignature *signature, CFOptionFlags callBackTypes, CFSocketCallBack callout, const CFSocketContext *context);
CF_EXPORT CFSocketRef CFSocketCreateConnectedToSocketSignature(CFAllocatorRef allocator, const CFSocketSignature *signature, CFOptionFlags callBackTypes, CFSocketCallBack callout, const CFSocketContext *context, CFTimeInterval timeout);
/* CFSocketCreateWithSignature creates a socket of the requested type and binds its address (using CFSocketSetAddress) to the requested address. If this fails, it returns NULL. CFSocketCreateConnectedToSignature creates a socket suitable for connecting to the requested type and address, and connects it (using CFSocketConnectToAddress). If this fails, it returns NULL. */
CF_EXPORT CFSocketError CFSocketSetAddress(CFSocketRef s, CFDataRef address);
CF_EXPORT CFSocketError CFSocketConnectToAddress(CFSocketRef s, CFDataRef address, CFTimeInterval timeout);
CF_EXPORT void CFSocketInvalidate(CFSocketRef s);
CF_EXPORT Boolean CFSocketIsValid(CFSocketRef s);
CF_EXPORT CFDataRef CFSocketCopyAddress(CFSocketRef s);
CF_EXPORT CFDataRef CFSocketCopyPeerAddress(CFSocketRef s);
CF_EXPORT void CFSocketGetContext(CFSocketRef s, CFSocketContext *context);
CF_EXPORT CFSocketNativeHandle CFSocketGetNative(CFSocketRef s);
CF_EXPORT CFRunLoopSourceRef CFSocketCreateRunLoopSource(CFAllocatorRef allocator, CFSocketRef s, CFIndex order);
CF_EXPORT CFOptionFlags CFSocketGetSocketFlags(CFSocketRef s);
CF_EXPORT void CFSocketSetSocketFlags(CFSocketRef s, CFOptionFlags flags);
CF_EXPORT void CFSocketDisableCallBacks(CFSocketRef s, CFOptionFlags callBackTypes);
CF_EXPORT void CFSocketEnableCallBacks(CFSocketRef s, CFOptionFlags callBackTypes);
/* For convenience, a function is provided to send data using the socket with a timeout. The timeout will be used only if the specified value is positive. The address should be left NULL if the socket is already connected. */
CF_EXPORT CFSocketError CFSocketSendData(CFSocketRef s, CFDataRef address, CFDataRef data, CFTimeInterval timeout);
/* Generic name registry functionality (CFSocketRegisterValue,
CFSocketCopyRegisteredValue) allows the registration of any property
list type. Functions specific to CFSockets (CFSocketRegisterSocketData,
CFSocketCopyRegisteredSocketData) register a CFData containing the
components of a socket signature (protocol family, socket type,
protocol, and address). In each function the nameServerSignature
may be NULL, or any component of it may be 0, to use default values
(TCP, INADDR_LOOPBACK, port as set). Name registration servers might
not allow registration with other than TCP and INADDR_LOOPBACK.
The actual address of the server responding to a query may be obtained
by using the nameServerAddress argument. This address, the address
returned by CFSocketCopyRegisteredSocketSignature, and the value
returned by CFSocketCopyRegisteredValue must (if non-null) be released
by the caller. CFSocketUnregister removes any registration associated
with the specified name.
CF_EXPORT CFSocketError CFSocketRegisterValue(const CFSocketSignature *nameServerSignature, CFTimeInterval timeout, CFStringRef name, CFPropertyListRef value);
CF_EXPORT CFSocketError CFSocketCopyRegisteredValue(const CFSocketSignature *nameServerSignature, CFTimeInterval timeout, CFStringRef name, CFPropertyListRef *value, CFDataRef *nameServerAddress);
CF_EXPORT CFSocketError CFSocketRegisterSocketSignature(const CFSocketSignature *nameServerSignature, CFTimeInterval timeout, CFStringRef name, const CFSocketSignature *signature);
CF_EXPORT CFSocketError CFSocketCopyRegisteredSocketSignature(const CFSocketSignature *nameServerSignature, CFTimeInterval timeout, CFStringRef name, CFSocketSignature *signature, CFDataRef *nameServerAddress);
CF_EXPORT CFSocketError CFSocketUnregister(const CFSocketSignature *nameServerSignature, CFTimeInterval timeout, CFStringRef name);
CF_EXPORT void CFSocketSetDefaultNameRegistryPortNumber(UInt16 port);
CF_EXPORT UInt16 CFSocketGetDefaultNameRegistryPortNumber(void);
/* Constants used in name registry server communications */
CF_EXPORT const CFStringRef kCFSocketCommandKey;
CF_EXPORT const CFStringRef kCFSocketNameKey;
CF_EXPORT const CFStringRef kCFSocketValueKey;
CF_EXPORT const CFStringRef kCFSocketResultKey;
CF_EXPORT const CFStringRef kCFSocketErrorKey;
CF_EXPORT const CFStringRef kCFSocketRegisterCommand;
CF_EXPORT const CFStringRef kCFSocketRetrieveCommand;