/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2004, 2012 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * 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. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ 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
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+/*!
+ @header kern_control.h
+ This header defines an API to communicate between a kernel
+ extension and a process outside of the kernel.
*/
+#ifndef KPI_KERN_CONTROL_H
+#define KPI_KERN_CONTROL_H
-#ifndef SYS_KERN_CONTROL_H
-#define SYS_KERN_CONTROL_H
#include <sys/appleapiopts.h>
-#ifdef __APPLE_API_UNSTABLE
/*
* Define Controller event subclass, and associated events.
+ * Subclass of KEV_SYSTEM_CLASS
*/
-/* Subclass of KEV_SYSTEM_CLASS */
-#define KEV_CTL_SUBCLASS 1
+/*!
+ @defined KEV_CTL_SUBCLASS
+ @discussion The kernel event subclass for kernel control events.
+*/
+#define KEV_CTL_SUBCLASS 2
+
+/*!
+ @defined KEV_CTL_REGISTERED
+ @discussion The event code indicating a new controller was
+ registered. The data portion will contain a ctl_event_data.
+*/
+#define KEV_CTL_REGISTERED 1 /* a new controller appears */
-#define KEV_CTL_REGISTERED 1 /* a new controller appears */
-#define KEV_CTL_DEREGISTERED 2 /* a controller disappears */
+/*!
+ @defined KEV_CTL_DEREGISTERED
+ @discussion The event code indicating a controller was unregistered.
+ The data portion will contain a ctl_event_data.
+*/
+#define KEV_CTL_DEREGISTERED 2 /* a controller disappears */
-/* All KEV_CTL_SUBCLASS events share the same header */
+/*!
+ @struct ctl_event_data
+ @discussion This structure is used for KEV_CTL_SUBCLASS kernel
+ events.
+ @field ctl_id The kernel control id.
+ @field ctl_unit The kernel control unit.
+*/
struct ctl_event_data {
- u_int32_t ctl_id;
+ u_int32_t ctl_id; /* Kernel Controller ID */
u_int32_t ctl_unit;
};
-
/*
* Controls destined to the Controller Manager.
*/
-#define CTLIOCGCOUNT _IOR('N', 1, int) /* get number of control structures registered */
+/*!
+ @defined CTLIOCGCOUNT
+ @discussion The CTLIOCGCOUNT ioctl can be used to determine the
+ number of kernel controllers registered.
+*/
+#define CTLIOCGCOUNT _IOR('N', 2, int) /* get number of control structures registered */
+
+/*!
+ @defined CTLIOCGINFO
+ @discussion The CTLIOCGINFO ioctl can be used to convert a kernel
+ control name to a kernel control id.
+*/
+#define CTLIOCGINFO _IOWR('N', 3, struct ctl_info) /* get id from name */
+
+
+/*!
+ @defined MAX_KCTL_NAME
+ @discussion Kernel control names must be no longer than
+ MAX_KCTL_NAME.
+*/
+#define MAX_KCTL_NAME 96
/*
- * Controller address structure
- * used to establish contact between user client and kernel controller
- * sc_id/sc_unit uniquely identify each controller
- * sc_id is a 32-bit "signature" obtained by developers from Apple Computer
- * sc_unit is a unit number for this sc_id, and is privately used
- * by the developper to identify several instances to control
+ * Controls destined to the Controller Manager.
*/
-struct sockaddr_ctl
-{
- u_char sc_len; /* sizeof(struct sockaddr_ctl) */
- u_char sc_family; /* AF_SYSTEM */
- u_int16_t ss_sysaddr; /* AF_SYS_CONTROL */
- u_int32_t sc_id; /* 32-bit "signature" managed by Apple */
+/*!
+ @struct ctl_info
+ @discussion This structure is used with the CTLIOCGINFO ioctl to
+ translate from a kernel control name to a control id.
+ @field ctl_id The kernel control id, filled out upon return.
+ @field ctl_name The kernel control name to find.
+*/
+struct ctl_info {
+ u_int32_t ctl_id; /* Kernel Controller ID */
+ char ctl_name[MAX_KCTL_NAME]; /* Kernel Controller Name (a C string) */
+};
+
+
+/*!
+ @struct sockaddr_ctl
+ @discussion The controller address structure is used to establish
+ contact between a user client and a kernel controller. The
+ sc_id/sc_unit uniquely identify each controller. sc_id is a
+ unique identifier assigned to the controller. The identifier can
+ be assigned by the system at registration time or be a 32-bit
+ creator code obtained from Apple Computer. sc_unit is a unit
+ number for this sc_id, and is privately used by the kernel
+ controller to identify several instances of the controller.
+ @field sc_len The length of the structure.
+ @field sc_family AF_SYSTEM.
+ @field ss_sysaddr AF_SYS_KERNCONTROL.
+ @field sc_id Controller unique identifier.
+ @field sc_unit Kernel controller private unit number.
+ @field sc_reserved Reserved, must be set to zero.
+*/
+struct sockaddr_ctl {
+ u_char sc_len; /* depends on size of bundle ID string */
+ u_char sc_family; /* AF_SYSTEM */
+ u_int16_t ss_sysaddr; /* AF_SYS_KERNCONTROL */
+ u_int32_t sc_id; /* Controller unique identifier */
u_int32_t sc_unit; /* Developer private unit number */
u_int32_t sc_reserved[5];
};
-#endif /* __APPLE_API_UNSTABLE */
#ifdef KERNEL
-#ifdef __APPLE_API_UNSTABLE
-/* Reference to a controller object */
+#include <sys/kpi_mbuf.h>
+
+/*!
+ @typedef kern_ctl_ref
+ @discussion A control reference is used to track an attached kernel
+ control. Registering a kernel control will create a kernel
+ control reference. This reference is required for sending data
+ or removing the kernel control. This reference will be passed to
+ callbacks for that kernel control.
+*/
typedef void * kern_ctl_ref;
-/* Support flags for controllers */
-#define CTL_FLAG_PRIVILEGED 0x1 /* user must be root to contact controller */
+/*!
+ @defined CTL_FLAG_PRIVILEGED
+ @discussion The CTL_FLAG_PRIVILEGED flag is passed in ctl_flags. If
+ this flag is set, only privileged processes may attach to this
+ kernel control.
+*/
+#define CTL_FLAG_PRIVILEGED 0x1
+/*!
+ @defined CTL_FLAG_REG_ID_UNIT
+ @discussion The CTL_FLAG_REG_ID_UNIT flag is passed to indicate that
+ the ctl_id specified should be used. If this flag is not
+ present, a unique ctl_id will be dynamically assigned to your
+ kernel control. The CTLIOCGINFO ioctl can be used by the client
+ to find the dynamically assigned id based on the control name
+ specified in ctl_name.
+*/
+#define CTL_FLAG_REG_ID_UNIT 0x2
+/*!
+ @defined CTL_FLAG_REG_SOCK_STREAM
+ @discussion Use the CTL_FLAG_REG_SOCK_STREAM flag when client need to open
+ socket of type SOCK_STREAM to communicate with the kernel control.
+ By default kernel control sockets are of type SOCK_DGRAM.
+*/
+#define CTL_FLAG_REG_SOCK_STREAM 0x4
+
+#ifdef KERNEL_PRIVATE
+/*!
+ @defined CTL_FLAG_REG_EXTENDED
+ @discussion This flag indicates that this kernel control utilizes the
+ the extended fields within the kern_ctl_reg structure.
+*/
+#define CTL_FLAG_REG_EXTENDED 0x8
+#endif /* KERNEL_PRIVATE */
/* Data flags for controllers */
-#define CTL_DATA_NOWAKEUP 0x1 /* don't wake up client yet */
+/*!
+ @defined CTL_DATA_NOWAKEUP
+ @discussion The CTL_DATA_NOWAKEUP flag can be used for the enqueue
+ data and enqueue mbuf functions to indicate that the process
+ should not be woken up yet. This is useful when you want to
+ enqueue data using more than one call but only want to wake up
+ the client after all of the data has been enqueued.
+*/
+#define CTL_DATA_NOWAKEUP 0x1
+/*!
+ @defined CTL_DATA_EOR
+ @discussion The CTL_DATA_EOR flag can be used for the enqueue
+ data and enqueue mbuf functions to mark the end of a record.
+*/
+#define CTL_DATA_EOR 0x2
+__BEGIN_DECLS
-/*
- * Controller registration structure, given at registration time
+/*!
+ @typedef ctl_connect_func
+ @discussion The ctl_connect_func is used to receive
+ notification of a client connecting to the kernel control.
+ @param kctlref The control ref for the kernel control the client is
+ connecting to.
+ @param sac The address used to connect to this control. The field sc_unit
+ contains the unit number of the kernel control instance the client is
+ connecting to. If CTL_FLAG_REG_ID_UNIT was set when the kernel control
+ was registered, sc_unit is the ctl_unit of the kern_ctl_reg structure.
+ If CTL_FLAG_REG_ID_UNIT was not set when the kernel control was
+ registered, sc_unit is the dynamically allocated unit number of
+ the new kernel control instance that is used for this connection.
+ @param unitinfo A placeholder for a pointer to the optional user-defined
+ private data associated with this kernel control instance. This
+ opaque info will be provided to the user when the rest of the
+ callback routines are executed. For example, it can be used
+ to pass a pointer to an instance-specific data structure in
+ order for the user to keep track of the states related to this
+ kernel control instance.
+ */
+typedef errno_t (*ctl_connect_func)(kern_ctl_ref kctlref,
+ struct sockaddr_ctl *sac,
+ void **unitinfo);
+
+/*!
+ @typedef ctl_disconnect_func
+ @discussion The ctl_disconnect_func is used to receive notification
+ that a client has disconnected from the kernel control. This
+ usually happens when the socket is closed. If this is the last
+ socket attached to your kernel control, you may unregister your
+ kernel control from this callback.
+ @param kctlref The control ref for the kernel control instance the client has
+ disconnected from.
+ @param unit The unit number of the kernel control instance the client has
+ disconnected from.
+ @param unitinfo The user-defined private data initialized by the
+ ctl_connect_func callback.
+ */
+typedef errno_t (*ctl_disconnect_func)(kern_ctl_ref kctlref, u_int32_t unit, void *unitinfo);
+
+/*!
+ @typedef ctl_send_func
+ @discussion The ctl_send_func is used to receive data sent from
+ the client to the kernel control.
+ @param kctlref The control ref of the kernel control.
+ @param unit The unit number of the kernel control instance the client has
+ connected to.
+ @param unitinfo The user-defined private data initialized by the
+ ctl_connect_func callback.
+ @param m The data sent by the client to the kernel control in an
+ mbuf chain. Your function is responsible for releasing the
+ mbuf chain.
+ @param flags The flags specified by the client when calling
+ send/sendto/sendmsg (MSG_OOB/MSG_DONTROUTE).
+ */
+typedef errno_t (*ctl_send_func)(kern_ctl_ref kctlref, u_int32_t unit, void *unitinfo,
+ mbuf_t m, int flags);
+
+/*!
+ @typedef ctl_setopt_func
+ @discussion The ctl_setopt_func is used to handle set socket option
+ calls for the SYSPROTO_CONTROL option level.
+ @param kctlref The control ref of the kernel control.
+ @param unit The unit number of the kernel control instance.
+ @param unitinfo The user-defined private data initialized by the
+ ctl_connect_func callback.
+ @param opt The socket option.
+ @param data A pointer to the socket option data. The data has
+ already been copied in to the kernel for you.
+ @param len The length of the socket option data.
+ */
+typedef errno_t (*ctl_setopt_func)(kern_ctl_ref kctlref, u_int32_t unit, void *unitinfo,
+ int opt, void *data, size_t len);
+
+/*!
+ @typedef ctl_getopt_func
+ @discussion The ctl_getopt_func is used to handle client get socket
+ option requests for the SYSPROTO_CONTROL option level. A buffer
+ is allocated for storage and passed to your function. The length
+ of that buffer is also passed. Upon return, you should set *len
+ to length of the buffer used. In some cases, data may be NULL.
+ When this happens, *len should be set to the length you would
+ have returned had data not been NULL. If the buffer is too small,
+ return an error.
+ @param kctlref The control ref of the kernel control.
+ @param unit The unit number of the kernel control instance.
+ @param unitinfo The user-defined private data initialized by the
+ ctl_connect_func callback.
+ @param opt The socket option.
+ @param data A buffer to copy the results in to. May be NULL, see
+ discussion.
+ @param len A pointer to the length of the buffer. This should be set
+ to the length of the buffer used before returning.
*/
+typedef errno_t (*ctl_getopt_func)(kern_ctl_ref kctlref, u_int32_t unit, void *unitinfo,
+ int opt, void *data, size_t *len);
+
+#ifdef KERNEL_PRIVATE
+/*!
+ @typedef ctl_rcvd_func
+ @discussion The ctl_rcvd_func is called when the client reads data from
+ the kernel control socket. The kernel control can use this callback
+ in combination with ctl_getenqueuespace() to avoid overflowing
+ the socket's receive buffer. When ctl_getenqueuespace() returns
+ 0 or ctl_enqueuedata()/ctl_enqueuembuf() return ENOBUFS, the
+ kernel control can wait until this callback is called before
+ trying to enqueue the data again.
+ @param kctlref The control ref of the kernel control.
+ @param unit The unit number of the kernel control instance.
+ @param unitinfo The user-defined private data initialized by the
+ ctl_connect_func callback.
+ @param flags The recv flags. See the recv(2) man page.
+ */
+typedef void (*ctl_rcvd_func)(kern_ctl_ref kctlref, u_int32_t unit, void *unitinfo,
+ int flags);
+#endif /* KERNEL_PRIVATE */
+
+/*!
+ @struct kern_ctl_reg
+ @discussion This structure defines the properties of a kernel
+ control being registered.
+ @field ctl_name A Bundle ID string of up to MAX_KCTL_NAME bytes (including the ending zero).
+ This string should not be empty.
+ @field ctl_id The control ID may be dynamically assigned or it can be a
+ 32-bit creator code assigned by DTS.
+ For a DTS assigned creator code the CTL_FLAG_REG_ID_UNIT flag must be set.
+ For a dynamically assigned control ID, do not set the CTL_FLAG_REG_ID_UNIT flag.
+ The value of the dynamically assigned control ID is set to this field
+ when the registration succeeds.
+ @field ctl_unit A separate unit number to register multiple units that
+ share the same control ID with DTS assigned creator code when
+ the CTL_FLAG_REG_ID_UNIT flag is set.
+ This field is ignored for a dynamically assigned control ID.
+ @field ctl_flags CTL_FLAG_PRIVILEGED and/or CTL_FLAG_REG_ID_UNIT.
+ @field ctl_sendsize Override the default send size. If set to zero,
+ the default send size will be used, and this default value
+ is set to this field to be retrieved by the caller.
+ @field ctl_recvsize Override the default receive size. If set to
+ zero, the default receive size will be used, and this default value
+ is set to this field to be retrieved by the caller.
+ @field ctl_connect Specify the function to be called whenever a client
+ connects to the kernel control. This field must be specified.
+ @field ctl_disconnect Specify a function to be called whenever a
+ client disconnects from the kernel control.
+ @field ctl_send Specify a function to handle data send from the
+ client to the kernel control.
+ @field ctl_setopt Specify a function to handle set socket option
+ operations for the kernel control.
+ @field ctl_getopt Specify a function to handle get socket option
+ operations for the kernel control.
+*/
struct kern_ctl_reg
{
- /* control information */
- u_int32_t ctl_id; /* unique id of the controller, provided by DTS */
- u_int32_t ctl_unit; /* unit number for the controller, for the specified id */
- /* a controller can be registered several times with the same id */
- /* but must have a different unit number */
-
+ /* control information */
+ char ctl_name[MAX_KCTL_NAME];
+ u_int32_t ctl_id;
+ u_int32_t ctl_unit;
+
/* control settings */
- u_int32_t ctl_flags; /* support flags */
- u_int32_t ctl_sendsize; /* override send/receive buffer size */
- u_int32_t ctl_recvsize; /* 0 = use default values */
+ u_int32_t ctl_flags;
+ u_int32_t ctl_sendsize;
+ u_int32_t ctl_recvsize;
/* Dispatch functions */
-
- int (*ctl_connect)
- (kern_ctl_ref ctlref, void *userdata);
- /* Make contact, called when user client calls connect */
- /* the socket with the id/unit of the controller */
-
- void (*ctl_disconnect)
- (kern_ctl_ref ctlref, void *userdata);
- /* Break contact, called when user client */
- /* closes the control socket */
-
- int (*ctl_write)
- (kern_ctl_ref ctlref, void *userdata, struct mbuf *m);
- /* Send data to the controller, called when user client */
- /* writes data to the socket */
-
- int (*ctl_set)
- (kern_ctl_ref ctlref, void *userdata, int opt, void *data, size_t len);
- /* set controller configuration, called when user client */
- /* calls setsockopt() for the socket */
- /* opt is the option number */
- /* data points to the data, already copied in kernel space */
- /* len is the lenght of the data buffer */
-
- int (*ctl_get)
- (kern_ctl_ref ctlref, void *userdata, int opt, void *data, size_t *len);
- /* get controller configuration, called when user client */
- /* calls getsockopt() for the socket */
- /* opt is the option number */
- /* data points to the data buffer of max lenght len */
- /* the controller can directly copy data in the buffer space */
- /* and does not need to worry about copying out the data */
- /* as long as it respects the max buffer lenght */
- /* on input, len contains the maximum buffer length */
- /* on output, len contains the actual buffer lenght */
- /* if data is NULL on input, then, by convention, the controller */
- /* should return in len the lenght of the data it would like */
- /* to return in the subsequent call for that option */
-
- /* prepare the future */
- u_int32_t ctl_reserved[4]; /* for future use if needed */
+ ctl_connect_func ctl_connect;
+ ctl_disconnect_func ctl_disconnect;
+ ctl_send_func ctl_send;
+ ctl_setopt_func ctl_setopt;
+ ctl_getopt_func ctl_getopt;
+#ifdef KERNEL_PRIVATE
+ ctl_rcvd_func ctl_rcvd; /* Only valid if CTL_FLAG_REG_EXTENDED is set */
+#endif /* KERNEL_PRIVATE */
};
+/*!
+ @function ctl_register
+ @discussion Register a kernel control. This will enable clients to
+ connect to the kernel control using a PF_SYSTEM socket.
+ @param userkctl A structure defining the kernel control to be
+ attached. The ctl_connect callback must be specified, the other callbacks
+ are optional. If ctl_connect is set to zero, ctl_register fails with
+ the error code EINVAL.
+ @param kctlref Upon successful return, the kctlref will contain a
+ reference to the attached kernel control. This reference is used
+ to unregister the kernel control. This reference will also be
+ passed in to the callbacks each time they are called.
+ @result 0 - Kernel control was registered.
+ EINVAL - The registration structure was not valid.
+ ENOMEM - There was insufficient memory.
+ EEXIST - A controller with that id/unit is already registered.
+ */
+errno_t
+ctl_register(struct kern_ctl_reg *userkctl, kern_ctl_ref *kctlref);
-/*
- * FUNCTION :
- * Register the controller to the controller manager
- * For example, can be called from a Kernel Extension Start routine
- *
- * PARAMETERS :
- * userctl : Registration structure containing control information
- * and callback functions for the controller.
- * Callbacks are optional and can be null.
- * A controller with all callbacks set to null would not be very useful.
- * userdata : This parameter is for use by the controller and
- * will be passed to every callback function
- *
- * RETURN CODE :
- * 0 : No error
- * ctlref will be filled with a control reference,
- * to use in subsequent call to the controller manager
- * EINVAL : Invalid registration structure
- * ENOMEM : Not enough memory available to register the controller
- * EEXIST : Controller id/unit already registered
- */
-
-int
-ctl_register(struct kern_ctl_reg *userctl, void *userdata, kern_ctl_ref *ctlref);
+/*!
+ @function ctl_deregister
+ @discussion Unregister a kernel control. A kernel extension must
+ unregister it's kernel control(s) before unloading. If a kernel
+ control has clients attached, this call will fail.
+ @param kctlref The control reference of the control to unregister.
+ @result 0 - Kernel control was unregistered.
+ EINVAL - The kernel control reference was invalid.
+ EBUSY - The kernel control has clients still attached.
+ */
+errno_t
+ctl_deregister(kern_ctl_ref kctlref);
-/*
- * FUNCTION :
- * Deregister the controller
- * For example, can be called from a Kernel Extension Stop routine
- *
- * PARAMETERS :
- * ctlref : Reference to the controller previously registered
- *
- * RETURN CODE :
- * 0 : No error,
- * The controller manager no longer knows about the controller
- * EINVAL : Invalid reference
+/*!
+ @function ctl_enqueuedata
+ @discussion Send data from the kernel control to the client.
+ @param kctlref The control reference of the kernel control.
+ @param unit The unit number of the kernel control instance.
+ @param data A pointer to the data to send.
+ @param len The length of data to send.
+ @param flags Send flags. CTL_DATA_NOWAKEUP and CTL_DATA_EOR are currently
+ the only supported flags.
+ @result 0 - Data was enqueued to be read by the client.
+ EINVAL - Invalid parameters.
+ EMSGSIZE - The buffer is too large.
+ ENOBUFS - The queue is full or there are no free mbufs.
*/
-
-int
-ctl_deregister(kern_ctl_ref ctlref);
+errno_t
+ctl_enqueuedata(kern_ctl_ref kctlref, u_int32_t unit, void *data, size_t len, u_int32_t flags);
-/*
- * FUNCTION :
- * Send data to the application in contact with the controller
- * ctl_enqueuedata will allocate a mbuf, copy data and enqueue it.
- *
- * PARAMETERS :
- * ctlref : Reference to the controller previously registered
- * data : Data to send
- * len : Length of the data (maximum lenght of MCLBYTES)
- * flags : Flags used when enqueing
- * CTL_DATA_NOWAKEUP = just enqueue, don't wake up client
- *
- * RETURN CODE :
- * 0 : No error
- * EINVAL: Invalid reference
- * EMSGSIZE: The buffer is too large
- * ENOTCONN : No user client is connected
- * ENOBUFS : Socket buffer is full, or can't get a new mbuf
- * The controller should re-enqueue later
- */
-
-int
-ctl_enqueuedata(kern_ctl_ref ctlref, void *data, size_t len, u_int32_t flags);
+/*!
+ @function ctl_enqueuembuf
+ @discussion Send data stored in an mbuf chain from the kernel
+ control to the client. The caller is responsible for freeing
+ the mbuf chain if ctl_enqueuembuf returns an error.
+ @param kctlref The control reference of the kernel control.
+ @param unit The unit number of the kernel control instance.
+ @param m An mbuf chain containing the data to send to the client.
+ @param flags Send flags. CTL_DATA_NOWAKEUP and CTL_DATA_EOR are currently
+ the only supported flags.
+ @result 0 - Data was enqueued to be read by the client.
+ EINVAL - Invalid parameters.
+ ENOBUFS - The queue is full.
+ */
+errno_t
+ctl_enqueuembuf(kern_ctl_ref kctlref, u_int32_t unit, mbuf_t m, u_int32_t flags);
-/*
- * FUNCTION :
- * Send data to the application in contact with the controller
- *
- * PARAMETERS :
- * ctlref : Reference to the controller previously registered
- * m : mbuf containing the data to send
- * flags : Flags used when enqueing
- * CTL_DATA_NOWAKEUP = just enqueue, don't wake up client
- *
- * RETURN CODE :
- * 0 : No error
- * EINVAL: Invalid reference
- * ENOTCONN : No user client is connected
- * ENOBUFS : Socket buffer is full,
- * The controller should either free the mbuf or re-enqueue later
- */
-
-int
-ctl_enqueuembuf(kern_ctl_ref ctlref, struct mbuf *m, u_int32_t flags);
-
-#endif /* __APPLE_API_UNSTABLE */
+
+/*!
+ @function ctl_getenqueuespace
+ @discussion Retrieve the amount of space currently available for data to be sent
+ from the kernel control to the client.
+ @param kctlref The control reference of the kernel control.
+ @param unit The unit number of the kernel control instance.
+ @param space The address where to return the current space available
+ @result 0 - Success; the amount of space is returned to caller.
+ EINVAL - Invalid parameters.
+ */
+errno_t
+ctl_getenqueuespace(kern_ctl_ref kctlref, u_int32_t unit, size_t *space);
+
+#ifdef KERNEL_PRIVATE
+u_int32_t ctl_id_by_name(const char *name);
+errno_t ctl_name_by_id(u_int32_t id, char *out_name, size_t maxsize);
+#endif /* KERNEL_PRIVATE */
+
+__END_DECLS
#endif /* KERNEL */
-#endif /* SYS_KERN_CONTROL_H */
+#endif /* KPI_KERN_CONTROL_H */
projects / apple / xnu.git / blobdiff