event.c File Reference

Wrapper around libkqueue to make managing events easier. More...

#include <freeradius-devel/util/dlist.h>
#include <freeradius-devel/util/event.h>
#include <freeradius-devel/util/lst.h>
#include <freeradius-devel/util/log.h>
#include <freeradius-devel/util/rb.h>
#include <freeradius-devel/util/strerror.h>
#include <freeradius-devel/util/syserror.h>
#include <freeradius-devel/util/table.h>
#include <freeradius-devel/util/token.h>
#include <freeradius-devel/util/atexit.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <pthread.h>

Include dependency graph for event.c:

Go to the source code of this file.

Data Structures
struct	fr_event_fd
	A file descriptor/filter event. More...
struct	fr_event_func_map_entry_t
	Specifies a mapping between a function pointer in a structure and its respective event. More...
struct	fr_event_func_map_t
struct	fr_event_list
	Stores all information relating to an event list. More...
struct	fr_event_pid
struct	fr_event_pid.early_exit
	Fields that are only used if we're being triggered by a user event. More...
struct	fr_event_pid_reap_t
	Hold additional information for automatically reaped PIDs. More...
struct	fr_event_post_t
	Callbacks to perform after all timers and FDs have been checked. More...
struct	fr_event_pre_t
	Callbacks to perform when the event handler is about to check the events. More...
struct	fr_event_timer
	A timer event. More...
struct	fr_event_user_s
	Callbacks for kevent() user events. More...

Macros
#define	EVENT_DEBUG(...)
#define	FR_EV_BATCH_FDS   (256)
#define	FR_EVENT_FD_PCAP   0
#define	fr_time()   static_assert(0, "Use el->time for event loop timing")
#define	GET_FUNC(_ef, _offset)   *((fr_event_fd_cb_t const *)((uint8_t const *)&(_ef)->active + _offset))
#define	NOTE_EXITSTATUS   (0)

Enumerations
enum	fr_event_fd_type_t {   FR_EVENT_FD_SOCKET = 1 ,   FR_EVENT_FD_FILE = 2 ,   FR_EVENT_FD_DIRECTORY = 4 }
enum	fr_event_func_idx_type_t {   FR_EVENT_FUNC_IDX_NONE = 0 ,   FR_EVENT_FUNC_IDX_FILTER ,   FR_EVENT_FUNC_IDX_FFLAGS }

Functions
static int	_event_build_indexes (UNUSED void *uctx)
static int	_event_fd_delete (fr_event_fd_t *ef)
	Remove a file descriptor from the event loop and rbtree but don't explicitly free it. More...
static int	_event_free_indexes (UNUSED void *uctx)
	Free any memory we allocated for indexes. More...
static int	_event_list_free (fr_event_list_t *el)
	Cleanup an event list. More...
static int	_event_pid_free (fr_event_pid_t *ev)
	Remove PID wait event from kevent if the fr_event_pid_t is freed. More...
static int	_event_timer_free (fr_event_timer_t *ev)
	Remove an event from the event loop. More...
static int	_event_user_delete (fr_event_user_t *ev)
	Memory will not be freed if we fail to remove the event from the kqueue. More...
int	_fr_event_fd_insert (NDEBUG_LOCATION_ARGS TALLOC_CTX *ctx, fr_event_fd_t **ef_out, fr_event_list_t *el, int fd, fr_event_fd_cb_t read_fn, fr_event_fd_cb_t write_fn, fr_event_error_cb_t error, void *uctx)
	Associate I/O callbacks with a file descriptor. More...
int	_fr_event_fd_move (NDEBUG_LOCATION_ARGS fr_event_list_t *dst, fr_event_list_t *src, int fd, fr_event_filter_t filter)
	Move a file descriptor event from one event list to another. More...
int	_fr_event_filter_insert (NDEBUG_LOCATION_ARGS TALLOC_CTX *ctx, fr_event_fd_t **ef_out, fr_event_list_t *el, int fd, fr_event_filter_t filter, void *funcs, fr_event_error_cb_t error, void *uctx)
	Insert a filter for the specified fd. More...
int	_fr_event_filter_update (NDEBUG_LOCATION_ARGS fr_event_list_t *el, int fd, fr_event_filter_t filter, fr_event_update_t const updates[])
	Suspend/resume a subset of filters. More...
static void	_fr_event_pid_early_exit (fr_event_list_t *el, void *uctx)
	Called on the next loop through the event loop when inserting an EVFILT_PROC event fails. More...
int	_fr_event_pid_reap (NDEBUG_LOCATION_ARGS fr_event_list_t *el, pid_t pid, fr_event_pid_cb_t callback, void *uctx)
	Asynchronously wait for a PID to exit, then reap it. More...
static void	_fr_event_pid_reap_cb (UNUSED fr_event_list_t *el, pid_t pid, int status, void *uctx)
	Does the actual reaping of PIDs. More...
int	_fr_event_pid_wait (NDEBUG_LOCATION_ARGS TALLOC_CTX *ctx, fr_event_list_t *el, fr_event_pid_t const **ev_p, pid_t pid, fr_event_pid_cb_t callback, void *uctx)
	Insert a PID event into an event list. More...
static int	_fr_event_reap_free (fr_event_pid_reap_t *reap)
int	_fr_event_timer_at (NDEBUG_LOCATION_ARGS TALLOC_CTX *ctx, fr_event_list_t *el, fr_event_timer_t const **ev_p, fr_time_t when, fr_event_timer_cb_t callback, void const *uctx)
	Insert a timer event into an event list. More...
int	_fr_event_timer_in (NDEBUG_LOCATION_ARGS TALLOC_CTX *ctx, fr_event_list_t *el, fr_event_timer_t const **ev_p, fr_time_delta_t delta, fr_event_timer_cb_t callback, void const *uctx)
	Insert a timer event into an event list. More...
int	_fr_event_user_insert (NDEBUG_LOCATION_ARGS TALLOC_CTX *ctx, fr_event_list_t *el, fr_event_user_t **ev_p, bool trigger, fr_event_user_cb_t callback, void *uctx)
	Add a user callback to the event list. More...
static void	event_callback (fr_event_list_t *el, fr_event_fd_t *ef, int *filter, int flags, int *fflags)
	EVENT_DEBUG ("%s - Reaper forcefully reaping PID %u - %p", __FUNCTION__, reap->pid_ev->pid, reap)
static fr_event_fd_cb_t	event_fd_func (fr_event_fd_t *ef, int *filter, int *fflags)
	Figure out which function to call given a kevent. More...
static void	event_fd_func_index_build (fr_event_func_map_t *map)
static void	event_list_reap_run_callback (fr_event_pid_reap_t *reap, pid_t pid, int status)
	Saves some boilerplate... More...
	event_list_reap_run_callback (reap, reap->pid_ev->pid, status)
static void	event_pid_eval (fr_event_list_t *el, struct kevent *kev)
	Evaluate a EVFILT_PROC event. More...
static void	event_user_eval (fr_event_list_t *el, struct kevent *kev)
static ssize_t	fr_event_build_evset (UNUSED fr_event_list_t *el, struct kevent out_kev[], size_t outlen, fr_event_funcs_t *active, fr_event_fd_t *ef, fr_event_funcs_t const *new, fr_event_funcs_t const *prev)
	Build a new evset based on function pointers present. More...
int	fr_event_corral (fr_event_list_t *el, fr_time_t now, bool wait)
	Gather outstanding timer and file descriptor events. More...
int	fr_event_fd_armour (fr_event_list_t *el, int fd, fr_event_filter_t filter, uintptr_t armour)
	Armour an FD. More...
fr_event_fd_cb_t	fr_event_fd_cb (fr_event_fd_t *ef, int kq_filter, int kq_fflags)
	Returns the appropriate callback function for a given event. More...
static int8_t	fr_event_fd_cmp (void const *one, void const *two)
	Compare two file descriptor handles. More...
int	fr_event_fd_delete (fr_event_list_t *el, int fd, fr_event_filter_t filter)
	Remove a file descriptor from the event loop. More...
fr_event_fd_t *	fr_event_fd_handle (fr_event_list_t *el, int fd, fr_event_filter_t filter)
	Get the opaque event handle from a file descriptor. More...
static void	fr_event_fd_noop (UNUSED fr_event_list_t *el, UNUSED int fd, UNUSED int flags, UNUSED void *uctx)
	Placeholder callback to avoid branches in service loop. More...
static int	fr_event_fd_type_set (fr_event_fd_t *ef, int fd)
	Discover the type of a file descriptor. More...
void *	fr_event_fd_uctx (fr_event_fd_t *ef)
	Returns the uctx associated with an fr_event_fd_t handle. More...
int	fr_event_fd_unarmour (fr_event_list_t *el, int fd, fr_event_filter_t filter, uintptr_t armour)
	Unarmour an FD. More...
fr_event_list_t *	fr_event_list_alloc (TALLOC_CTX *ctx, fr_event_status_cb_t status, void *status_uctx)
	Initialise a new event list. More...
bool	fr_event_list_empty (fr_event_list_t *el)
	Return whether the event loop has any active events. More...
int	fr_event_list_kq (fr_event_list_t *el)
	Return the kq associated with an event list. More...
uint64_t	fr_event_list_num_fds (fr_event_list_t *el)
	Return the number of file descriptors is_registered with this event loop. More...
uint64_t	fr_event_list_num_timers (fr_event_list_t *el)
	Return the number of timer events currently scheduled. More...
unsigned int	fr_event_list_reap_signal (fr_event_list_t *el, fr_time_delta_t timeout, int signal)
	Send a signal to all the processes we have in our reap list, and reap them. More...
void	fr_event_list_set_time_func (fr_event_list_t *el, fr_event_time_source_t func)
	Override event list time source. More...
fr_time_t	fr_event_list_time (fr_event_list_t *el)
	Get the current server time according to the event list. More...
int	fr_event_loop (fr_event_list_t *el)
	Run an event loop. More...
void	fr_event_loop_exit (fr_event_list_t *el, int code)
	Signal an event loop exit with the specified code. More...
bool	fr_event_loop_exiting (fr_event_list_t *el)
	Check to see whether the event loop is in the process of exiting. More...
int	fr_event_post_delete (fr_event_list_t *el, fr_event_timer_cb_t callback, void *uctx)
	Delete a post-event callback from the event list. More...
int	fr_event_post_insert (fr_event_list_t *el, fr_event_timer_cb_t callback, void *uctx)
	Add a post-event callback to the event list. More...
int	fr_event_pre_delete (fr_event_list_t *el, fr_event_status_cb_t callback, void *uctx)
	Delete a pre-event callback from the event list. More...
int	fr_event_pre_insert (fr_event_list_t *el, fr_event_status_cb_t callback, void *uctx)
	Add a pre-event callback to the event list. More...
void	fr_event_service (fr_event_list_t *el)
	Service any outstanding timer or file descriptor events. More...
static int8_t	fr_event_timer_cmp (void const *a, void const *b)
	Compare two timer events to see which one should occur first. More...
int	fr_event_timer_delete (fr_event_timer_t const **ev_p)
	Delete a timer event from the event list. More...
int	fr_event_timer_run (fr_event_list_t *el, fr_time_t *when)
	Run a single scheduled timer event. More...
fr_time_t	fr_event_timer_when (fr_event_timer_t const *ev)
	Internal timestamp representing when the timer should fire. More...
int	fr_event_user_trigger (fr_event_list_t *el, fr_event_user_t *ev)
	Trigger a user event. More...
	if (kill(reap->pid_ev->pid, signal)< 0)
	talloc_free (reap)
	waitpid (reap->pid_ev->pid, &status, 0)

Variables
force	__pad0__
static fr_event_func_map_t	filter_maps []
static fr_table_num_sorted_t const	fr_event_fd_type_table []
static size_t	fr_event_fd_type_table_len = NUM_ELEMENTS(fr_event_fd_type_table)
static fr_table_num_sorted_t const	kevent_filter_table []
static size_t	kevent_filter_table_len = NUM_ELEMENTS(kevent_filter_table)
return	processed

Detailed Description

Wrapper around libkqueue to make managing events easier.

Non-thread-safe event handling specific to FreeRADIUS.

By non-thread-safe we mean multiple threads can't insert/delete events concurrently into the same event list without synchronization.

Copyright

2007-2016 The FreeRADIUS server project

2016 Arran Cudbard-Bell (a.cud.nosp@m.bard.nosp@m.b@fre.nosp@m.erad.nosp@m.ius.o.nosp@m.rg)

2007 Alan DeKok (aland.nosp@m.@fre.nosp@m.eradi.nosp@m.us.o.nosp@m.rg)

Definition in file event.c.

---

Data Structure Documentation

fr_event_fd

struct fr_event_fd

A file descriptor/filter event.

Definition at line 294 of file event.c.

Collaboration diagram for fr_event_fd:

Data Fields
fr_event_funcs_t	active	Active filter functions.
uintptr_t	armour	protection flag from being deleted.
fr_event_list_t *	el	Event list this event belongs to.
fr_dlist_t	entry	Entry in free list.
fr_event_error_cb_t	error	Callback for when an error occurs on the FD.
int	fd	File descriptor we're listening for events on.
char const *	file	Source file this event was last updated in.
fr_event_filter_t	filter
bool	is_registered	Whether this fr_event_fd_t's FD has been registered with kevent. Mostly for debugging.
int	line	Line this event was last updated on.
TALLOC_CTX *	linked_ctx	talloc ctx this event was bound to.
fr_event_func_map_t const *	map	Function map between fr_event_funcs_t and kevent filters.
fr_rb_node_t	node	Entry in the tree of file descriptor handles. this should really go away and we should pass around handles directly.
int	sock_type	The type of socket SOCK_STREAM, SOCK_RAW etc...
fr_event_funcs_t	stored	Stored (set, but inactive) filter functions.
fr_event_fd_type_t	type	Type of events we're interested in.
void *	uctx	Context pointer to pass to each file descriptor callback.

fr_event_func_map_entry_t

struct fr_event_func_map_entry_t

Specifies a mapping between a function pointer in a structure and its respective event.

If the function pointer at the specified offset is set, then a matching event will be added.

If the function pointer is NULL, then any existing events will be removed.

Definition at line 155 of file event.c.

Data Fields
bool	coalesce	Coalesce this map with the next.
uint32_t	fflags	fflags to pass to filter.
int16_t	filter	Filter to apply.
uint16_t	flags	Flags to use for inserting event.
char const *	name	Name of the event.
size_t	offset	Offset of function pointer in structure.
int	type	Type this filter applies to.

fr_event_func_map_t

struct fr_event_func_map_t

Definition at line 165 of file event.c.

Collaboration diagram for fr_event_func_map_t:

Data Fields
fr_event_func_map_entry_t **	ev_to_func	Function -> Event maps in index order.
fr_event_func_map_entry_t *	func_to_ev	Function -> Event maps coalesced, out of order.
fr_event_func_idx_type_t	idx_type	What type of index we use for event to function mapping.

fr_event_list

struct fr_event_list

Stores all information relating to an event list.

Definition at line 411 of file event.c.

Collaboration diagram for fr_event_list:

Data Fields
bool	dispatch	Whether the event list is currently dispatching events.
fr_dlist_head_t	ev_to_add	dlist of events to add
struct kevent	events[FR_EV_BATCH_FDS]
int	exit	If non-zero event loop will prevent the addition of new events, and will return immediately from the corral/service function.
fr_dlist_head_t	fd_to_free	File descriptor events pending deletion.
fr_rb_tree_t *	fds	Tree used to track FDs with filters in kqueue.
bool	in_handler	Deletes should be deferred until after the handlers complete.
int	kq	instance associated with this event list.
fr_time_t	now	The last time the event list was serviced.
int	num_fd_events	Number of events in this event list.
fr_dlist_head_t	pid_to_reap	A list of all orphaned child processes we're waiting to reap.
fr_dlist_head_t	post_callbacks	post-processing callbacks
fr_dlist_head_t	pre_callbacks	callbacks when we may be idle...
fr_event_time_source_t	time	Where our time comes from.
fr_lst_t *	times	of timer events to be executed.
int	will_exit	Will exit on next call to fr_event_corral.

fr_event_pid

struct fr_event_pid

Definition at line 332 of file event.c.

Collaboration diagram for fr_event_pid:

Data Fields
fr_event_pid_cb_t	callback	callback to run when the child exits
struct fr_event_pid	early_exit	Fields that are only used if we're being triggered by a user event.
fr_event_list_t *	el	Event list this event belongs to.
char const *	file	Source file this event was last updated in.
bool	is_registered	Whether this user event has been registered with the event loop.
int	line	Line this event was last updated on.
fr_event_pid_t const **	parent
pid_t	pid	child to wait for
void *	uctx	Context pointer to pass to each file descriptor callback.

fr_event_pid.early_exit

struct fr_event_pid.early_exit

Fields that are only used if we're being triggered by a user event.

Definition at line 346 of file event.c.

Data Fields
fr_event_user_t *	ev	Fallback user event we use to raise a PID event when a race occurs with kevent.
int	status	Status we got from waitid.

fr_event_pid_reap_t

struct fr_event_pid_reap_t

Hold additional information for automatically reaped PIDs.

Definition at line 359 of file event.c.

Collaboration diagram for fr_event_pid_reap_t:

Data Fields
fr_event_pid_cb_t	callback	callback to run when the child exits
fr_event_list_t *	el	Event list this event belongs to.
fr_dlist_t	entry	If the fr_event_pid is in the detached, reap state, it's inserted into a list associated with the event. We then send SIGKILL, and forcefully reap the process on exit.
fr_event_pid_t const *	pid_ev	pid_ev this reaper is bound to.
void *	uctx	Context pointer to pass to each file descriptor callback.

fr_event_post_t

struct fr_event_post_t

Callbacks to perform after all timers and FDs have been checked.

Definition at line 402 of file event.c.

Collaboration diagram for fr_event_post_t:

Data Fields
fr_event_timer_cb_t	callback	The callback to call.
fr_dlist_t	entry	Linked list of callback.
void *	uctx	Context for the callback.

fr_event_pre_t

struct fr_event_pre_t

Callbacks to perform when the event handler is about to check the events.

Definition at line 393 of file event.c.

Collaboration diagram for fr_event_pre_t:

Data Fields
fr_event_status_cb_t	callback	The callback to call.
fr_dlist_t	entry	Linked list of callback.
void *	uctx	Context for the callback.

fr_event_timer

struct fr_event_timer

A timer event.

Definition at line 102 of file event.c.

Collaboration diagram for fr_event_timer:

Data Fields
fr_event_timer_cb_t	callback	Callback to execute when the timer fires.
fr_event_list_t *	el	Event list containing this timer.
fr_dlist_t	entry	List of deferred timer events.
char const *	file	Source file this event was last updated in.
int	line	Line this event was last updated on.
TALLOC_CTX *	linked_ctx	talloc ctx this event was bound to.
fr_lst_index_t	lst_id	Where to store opaque lst data.
fr_event_timer_t const **	parent	A pointer to the parent structure containing the timer event.
void const *	uctx	Context pointer to pass to the callback.
fr_time_t	when	When this timer should fire.

fr_event_user_s

struct fr_event_user_s

Callbacks for kevent() user events.

Definition at line 375 of file event.c.

Collaboration diagram for fr_event_user_s:

Data Fields
fr_event_user_cb_t	callback	The callback to call.
fr_event_list_t *	el	Event list this event belongs to.
char const *	file	Source file this event was last updated in.
bool	is_registered	Whether this user event has been registered with the event loop.
int	line	Line this event was last updated on.
void *	uctx	Context for the callback.

Macro Definition Documentation

EVENT_DEBUG

#define EVENT_DEBUG

(

...

)

Definition at line 73 of file event.c.

FR_EV_BATCH_FDS

#define FR_EV_BATCH_FDS   (256)

Definition at line 57 of file event.c.

FR_EVENT_FD_PCAP

#define FR_EVENT_FD_PCAP   0

Definition at line 145 of file event.c.

fr_time

#define fr_time

(

void

)

static_assert(0, "Use el->time for event loop timing")

Definition at line 60 of file event.c.

GET_FUNC

#define GET_FUNC	(		_ef,
			_offset
	)		*((fr_event_fd_cb_t const *)((uint8_t const *)&(_ef)->active + _offset))

NOTE_EXITSTATUS

#define NOTE_EXITSTATUS   (0)

Enumeration Type Documentation

fr_event_fd_type_t

enum fr_event_fd_type_t

Enumerator
FR_EVENT_FD_SOCKET	is a socket.
FR_EVENT_FD_FILE	is a file.
FR_EVENT_FD_DIRECTORY	is a directory.

Definition at line 124 of file event.c.

fr_event_func_idx_type_t

enum fr_event_func_idx_type_t

Enumerator
FR_EVENT_FUNC_IDX_NONE
FR_EVENT_FUNC_IDX_FILTER	Sign flip is performed i.e. -1 = 0The filter is used / as the index in the ev to func index.
FR_EVENT_FUNC_IDX_FFLAGS	The bit position of the flags in FFLAGS is used to provide the index. i.e. 0x01 -> 0, 0x02 -> 1, 0x08 -> 3 etc..

Definition at line 134 of file event.c.

Function Documentation

_event_build_indexes()

static int _event_build_indexes ( UNUSED void *  uctx )

static

Definition at line 2820 of file event.c.

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_event_fd_delete()

static int _event_fd_delete ( fr_event_fd_t *  ef )

static

Remove a file descriptor from the event loop and rbtree but don't explicitly free it.

Parameters

[in]

ef

to remove.

Returns

• 0 on success.
• -1 on error;

Definition at line 868 of file event.c.

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_event_free_indexes()

static int _event_free_indexes ( UNUSED void *  uctx )

static

Free any memory we allocated for indexes.

Definition at line 2812 of file event.c.

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_event_list_free()

static int _event_list_free ( fr_event_list_t *  el )

static

Cleanup an event list.

Frees/destroys any resources associated with an event list

Parameters

[in]

el

to free resources for.

Definition at line 2794 of file event.c.

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_event_pid_free()

static int _event_pid_free ( fr_event_pid_t *  ev )

static

Remove PID wait event from kevent if the fr_event_pid_t is freed.

Parameters

[in]

ev

to free.

Returns

0

Definition at line 1643 of file event.c.

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_event_timer_free()

static int _event_timer_free ( fr_event_timer_t *  ev )

static

Remove an event from the event loop.

Parameters

[in]

ev

to free.

Returns

• 0 on success.
• -1 on failure.

Definition at line 1396 of file event.c.

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_event_user_delete()

static int _event_user_delete ( fr_event_user_t *  ev )

static

Memory will not be freed if we fail to remove the event from the kqueue.

It's easier to debug memory leaks with modern tooling than it is to determine why we get random failures and event leaks inside of kqueue.

Returns

• 0 on success.
• -1 on failure.

Definition at line 2141 of file event.c.

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_fr_event_fd_insert()

int _fr_event_fd_insert	(	NDEBUG_LOCATION_ARGS TALLOC_CTX *	ctx,
		fr_event_fd_t **	ef_out,
		fr_event_list_t *	el,
		int	fd,
		fr_event_fd_cb_t	read_fn,
		fr_event_fd_cb_t	write_fn,
		fr_event_error_cb_t	error,
		void *	uctx
	)

Associate I/O callbacks with a file descriptor.

Parameters

[in]	ctx	to bind lifetime of the event to.
[out]	ef_out	Where to store the output event
[in]	el	to insert fd callback into.
[in]	fd	to install filters for.
[in]	read_fn	function to call when fd is readable.
[in]	write_fn	function to call when fd is writable.
[in]	error	function to call when an error occurs on the fd.
[in]	uctx	to pass to handler.

Returns

• 0 on success.
• -1 on failure.

Definition at line 1233 of file event.c.

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_fr_event_fd_move()

int _fr_event_fd_move	(	NDEBUG_LOCATION_ARGS fr_event_list_t *	dst,
		fr_event_list_t *	src,
		int	fd,
		fr_event_filter_t	filter
	)

Move a file descriptor event from one event list to another.

FIXME - Move suspended events too.

Note

Any pending events will not be transferred.

Parameters

[in]	dst	Event list to move file descriptor event to.
[in]	src	Event list to move file descriptor from.
[in]	fd	of the event to move.
[in]	filter	of the event to move.

Returns

• 0 on success.
• -1 on failure. The event will remain active in the src list.

Definition at line 949 of file event.c.

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_fr_event_filter_insert()

int _fr_event_filter_insert	(	NDEBUG_LOCATION_ARGS TALLOC_CTX *	ctx,
		fr_event_fd_t **	ef_out,
		fr_event_list_t *	el,
		int	fd,
		fr_event_filter_t	filter,
		void *	funcs,
		fr_event_error_cb_t	error,
		void *	uctx
	)

Insert a filter for the specified fd.

Parameters

[in]	ctx	to bind lifetime of the event to.
[out]	ef_out	Previously allocated ef, or NULL.
[in]	el	to insert fd callback into.
[in]	fd	to install filters for.
[in]	filter	one of the fr_event_filter_t values.
[in]	funcs	Structure containing callback functions. If a function pointer is set, the equivalent kevent filter will be installed.
[in]	error	function to call when an error occurs on the fd.
[in]	uctx	to pass to handler.

Definition at line 1077 of file event.c.

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_fr_event_filter_update()

int _fr_event_filter_update	(	NDEBUG_LOCATION_ARGS fr_event_list_t *	el,
		int	fd,
		fr_event_filter_t	filter,
		fr_event_update_t const	updates[]
	)

Suspend/resume a subset of filters.

This function trades producing useful errors for speed.

An example of suspending the read filter for an FD would be:

static fr_event_update_t pause_read[] = {
      FR_EVENT_SUSPEND(fr_event_io_func_t, read),
      { 0 }
}
 
fr_event_filter_update(el, fd, FR_EVENT_FILTER_IO, pause_read);

Parameters

[in]	el	to update descriptor in.
[in]	fd	to update filters for.
[in]	filter	The type of filter to update.
[in]	updates	An array of updates to toggle filters on/off without removing the callback function.

Definition at line 1000 of file event.c.

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_fr_event_pid_early_exit()

static void _fr_event_pid_early_exit ( fr_event_list_t *  el, void *  uctx  )

static

Called on the next loop through the event loop when inserting an EVFILT_PROC event fails.

This is just a trampoleen function which takes the user event and simulates an EVFILT_PROC event from it.

Parameters

[in]	el	That received the event.
[in]	uctx	An fr_event_pid_t to process.

Definition at line 1710 of file event.c.

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_fr_event_pid_reap()

int _fr_event_pid_reap	(	NDEBUG_LOCATION_ARGS fr_event_list_t *	el,
		pid_t	pid,
		fr_event_pid_cb_t	callback,
		void *	uctx
	)

Asynchronously wait for a PID to exit, then reap it.

This is intended to be used when we no longer care about a process exiting, but we still want to clean up its state so we don't have zombie processes sticking around.

Parameters

[in]	el	to use to reap the process.
[in]	pid	to reap.
[in]	callback	to call when the process is reaped. May be NULL.
[in]	uctx	to pass to callback.

Returns

• -1 if we couldn't find the process or it has already exited/been reaped.
• 0 on success (we setup a process handler).

Definition at line 1968 of file event.c.

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_fr_event_pid_reap_cb()

static void _fr_event_pid_reap_cb ( UNUSED fr_event_list_t *  el, pid_t  pid, int  status, void *  uctx  )

static

Does the actual reaping of PIDs.

Definition at line 1925 of file event.c.

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_fr_event_pid_wait()

int _fr_event_pid_wait	(	NDEBUG_LOCATION_ARGS TALLOC_CTX *	ctx,
		fr_event_list_t *	el,
		fr_event_pid_t const **	ev_p,
		pid_t	pid,
		fr_event_pid_cb_t	callback,
		void *	uctx
	)

Insert a PID event into an event list.

Note

The talloc parent of the memory returned in ev_p must not be changed. If the lifetime of the event needs to be bound to another context this function should be called with the existing event pointed to by ev_p.

Parameters

[in]	ctx	to bind lifetime of the event to.
[in]	el	to insert event into.
[in,out]	ev_p	If not NULL modify this event instead of creating a new one. This is a parent in a temporal sense, not in a memory structure or dependency sense.
[in]	pid	child PID to wait for
[in]	callback	function to execute if the event fires.
[in]	uctx	user data to pass to the event.

Returns

• 0 on success.
• -1 on failure.

Definition at line 1741 of file event.c.

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_fr_event_reap_free()

static int _fr_event_reap_free ( fr_event_pid_reap_t *  reap )

static

Definition at line 1938 of file event.c.

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_fr_event_timer_at()

int _fr_event_timer_at	(	NDEBUG_LOCATION_ARGS TALLOC_CTX *	ctx,
		fr_event_list_t *	el,
		fr_event_timer_t const **	ev_p,
		fr_time_t	when,
		fr_event_timer_cb_t	callback,
		void const *	uctx
	)

Insert a timer event into an event list.

Note

The talloc parent of the memory returned in ev_p must not be changed. If the lifetime of the event needs to be bound to another context this function should be called with the existing event pointed to by ev_p.

Parameters

[in]	ctx	to bind lifetime of the event to.
[in]	el	to insert event into.
[in,out]	ev_p	If not NULL modify this event instead of creating a new one. This is a parent in a temporal sense, not in a memory structure or dependency sense.
[in]	when	we should run the event.
[in]	callback	function to execute if the event fires.
[in]	uctx	user data to pass to the event.

Returns

• 0 on success.
• -1 on failure.

Definition at line 1451 of file event.c.

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_fr_event_timer_in()

int _fr_event_timer_in	(	NDEBUG_LOCATION_ARGS TALLOC_CTX *	ctx,
		fr_event_list_t *	el,
		fr_event_timer_t const **	ev_p,
		fr_time_delta_t	delta,
		fr_event_timer_cb_t	callback,
		void const *	uctx
	)

Insert a timer event into an event list.

Note

The talloc parent of the memory returned in ev_p must not be changed. If the lifetime of the event needs to be bound to another context this function should be called with the existing event pointed to by ev_p.

Parameters

[in]	ctx	to bind lifetime of the event to.
[in]	el	to insert event into.
[in,out]	ev_p	If not NULL modify this event instead of creating a new one. This is a parent in a temporal sense, not in a memory structure or dependency sense.
[in]	delta	In how many nanoseconds to wait before should we execute the event.
[in]	callback	function to execute if the event fires.
[in]	uctx	user data to pass to the event.

Returns

• 0 on success.
• -1 on failure.

Definition at line 1596 of file event.c.

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_fr_event_user_insert()

int _fr_event_user_insert	(	NDEBUG_LOCATION_ARGS TALLOC_CTX *	ctx,
		fr_event_list_t *	el,
		fr_event_user_t **	ev_p,
		bool	trigger,
		fr_event_user_cb_t	callback,
		void *	uctx
	)

Add a user callback to the event list.

Parameters

[in]	ctx	to allocate the event in.
[in]	el	Containing the timer events.
[out]	ev_p	Where to write a pointer.
[in]	trigger	Whether the user event is triggered initially.
[in]	callback	for EVFILT_USER.
[in]	uctx	for the callback.

Returns

• 0 on success.
• -1 on error.

Definition at line 2187 of file event.c.

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event_callback()

static void event_callback ( fr_event_list_t *  el, fr_event_fd_t *  ef, int *  filter, int  flags, int *  fflags  )

inlinestatic

Definition at line 2536 of file event.c.

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EVENT_DEBUG()

EVENT_DEBUG	(	"%s - Reaper forcefully reaping PID %u - %p"	,
		__FUNCTION__	,
		reap->pid_ev->	pid,
		reap
	)

event_fd_func()

static fr_event_fd_cb_t event_fd_func ( fr_event_fd_t *  ef, int *  filter, int *  fflags  )

inlinestatic

Figure out which function to call given a kevent.

This function should be called in a loop until it returns NULL.

Parameters

[in]	ef	File descriptor state handle.
[in]	filter	from the kevent.
[in,out]	fflags	from the kevent. Each call will return the function from the next most significant NOTE_*, with each NOTE_* before unset from fflags.

Returns

• NULL there are no more callbacks to call.
• The next callback to call.

Definition at line 529 of file event.c.

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event_fd_func_index_build()

static void event_fd_func_index_build ( fr_event_func_map_t *  map )

static

Definition at line 447 of file event.c.

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event_list_reap_run_callback() [1/2]

static void event_list_reap_run_callback ( fr_event_pid_reap_t *  reap, pid_t  pid, int  status  )

inlinestatic

Saves some boilerplate...

Definition at line 1917 of file event.c.

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event_list_reap_run_callback() [2/2]

event_list_reap_run_callback	(	reap	,
		reap->pid_ev->	pid,
		status
	)

event_pid_eval()

static void event_pid_eval ( fr_event_list_t *  el, struct kevent *  kev  )

inlinestatic

Evaluate a EVFILT_PROC event.

Definition at line 1663 of file event.c.

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event_user_eval()

static void event_user_eval ( fr_event_list_t *  el, struct kevent *  kev  )

inlinestatic

Definition at line 2159 of file event.c.

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fr_event_build_evset()

static ssize_t fr_event_build_evset ( UNUSED fr_event_list_t *  el, struct kevent  out_kev[], size_t  outlen, fr_event_funcs_t *  active, fr_event_fd_t *  ef, fr_event_funcs_t const *  new, fr_event_funcs_t const *  prev  )

static

Build a new evset based on function pointers present.

Note

The contents of active functions may be inconsistent if this function errors. But the only time that will occur is if the caller passed invalid arguments.

Parameters

[in]	el	we're building events for.
[out]	out_kev	where to write the evset.
[in]	outlen	length of output buffer.
[out]	active	The set of function pointers with active filters.
[in]	ef	event to insert.
[in]	new	Functions to map to filters.
[in]	prev	Previous set of functions mapped to filters.

Returns

• >= 0 the number of changes written to out.
• < 0 an error occurred.

Definition at line 678 of file event.c.

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fr_event_corral()

int fr_event_corral	(	fr_event_list_t *	el,
		fr_time_t	now,
		bool	wait
	)

Gather outstanding timer and file descriptor events.

Parameters

[in]	el	to process events for.
[in]	now	The current time.
[in]	wait	if true, block on the kevent() call until a timer or file descriptor event occurs.

Returns

• <0 error, or the event loop is exiting
• the number of outstanding I/O events, +1 if at least one timer will fire.

Definition at line 2414 of file event.c.

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fr_event_fd_armour()

int fr_event_fd_armour	(	fr_event_list_t *	el,
		int	fd,
		fr_event_filter_t	filter,
		uintptr_t	armour
	)

Armour an FD.

Parameters

[in]	el	to remove file descriptor from.
[in]	fd	to remove.
[in]	filter	The type of filter to remove.
[in]	armour	The armour to add.

Returns

• 0 if file descriptor was armoured
• <0 on error.

Definition at line 1342 of file event.c.

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fr_event_fd_cb()

fr_event_fd_cb_t fr_event_fd_cb	(	fr_event_fd_t *	ef,
		int	kq_filter,
		int	kq_fflags
	)

Returns the appropriate callback function for a given event.

Parameters

[in]	ef	the event filter fd handle.
[in]	kq_filter	If the callbacks are indexed by filter.
[in]	kq_fflags	If the callbacks are indexed by NOTES (fflags).

Returns

• NULL if no event it associated with the given ef/kq_filter or kq_fflags combo.
• The callback that would be called if an event with this filter/fflag combo was received.

Definition at line 1318 of file event.c.

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fr_event_fd_cmp()

static int8_t fr_event_fd_cmp ( void const *  one, void const *  two  )

static

Compare two file descriptor handles.

Parameters

[in]	one	the first file descriptor handle.
[in]	two	the second file descriptor handle.

Returns

CMP(one, two)

Definition at line 589 of file event.c.

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fr_event_fd_delete()

int fr_event_fd_delete	(	fr_event_list_t *	el,
		int	fd,
		fr_event_filter_t	filter
	)

Remove a file descriptor from the event loop.

Parameters

[in]	el	to remove file descriptor from.
[in]	fd	to remove.
[in]	filter	The type of filter to remove.

Returns

• 0 if file descriptor was removed.
• <0 on error.

Definition at line 1260 of file event.c.

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fr_event_fd_handle()

fr_event_fd_t* fr_event_fd_handle	(	fr_event_list_t *	el,
		int	fd,
		fr_event_filter_t	filter
	)

Get the opaque event handle from a file descriptor.

Parameters

[in]	el	to search for fd/filter in.
[in]	fd	to search for.
[in]	filter	to search for.

Returns

• NULL if no event could be found.
• The opaque handle representing an fd event.

Definition at line 1296 of file event.c.

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fr_event_fd_noop()

static void fr_event_fd_noop ( UNUSED fr_event_list_t *  el, UNUSED int  fd, UNUSED int  flags, UNUSED void *  uctx  )

static

Placeholder callback to avoid branches in service loop.

This is set in place of any NULL function pointers, so that the event loop doesn't SEGV if a filter callback function is unset between corral and service.

Definition at line 657 of file event.c.

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fr_event_fd_type_set()

static int fr_event_fd_type_set ( fr_event_fd_t *  ef, int  fd  )

static

Discover the type of a file descriptor.

This function writes the result of the discovery to the ef->type, and ef->sock_type fields.

Parameters

[out]	ef	to write type data to.
[in]	fd	to discover the type of.

Returns

• 0 on success.
• -1 on failure.

Definition at line 811 of file event.c.

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fr_event_fd_uctx()

void* fr_event_fd_uctx

(

fr_event_fd_t *

ef

)

Returns the uctx associated with an fr_event_fd_t handle.

Definition at line 1326 of file event.c.

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fr_event_fd_unarmour()

int fr_event_fd_unarmour	(	fr_event_list_t *	el,
		int	fd,
		fr_event_filter_t	filter,
		uintptr_t	armour
	)

Unarmour an FD.

Parameters

[in]	el	to remove file descriptor from.
[in]	fd	to remove.
[in]	filter	The type of filter to remove.
[in]	armour	The armour to remove

Returns

• 0 if file descriptor was unarmoured
• <0 on error.

Definition at line 1372 of file event.c.

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fr_event_list_alloc()

fr_event_list_t* fr_event_list_alloc	(	TALLOC_CTX *	ctx,
		fr_event_status_cb_t	status,
		void *	status_uctx
	)

Initialise a new event list.

Parameters

[in]	ctx	to allocate memory in.
[in]	status	callback, called on each iteration of the event list.
[in]	status_uctx	context for the status callback

Returns

• A pointer to a new event list on success (free with talloc_free).
• NULL on error.

Definition at line 2899 of file event.c.

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fr_event_list_empty()

bool fr_event_list_empty

(

fr_event_list_t *

el

)

Return whether the event loop has any active events.

Definition at line 2979 of file event.c.

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fr_event_list_kq()

int fr_event_list_kq

(

fr_event_list_t *

el

)

Return the kq associated with an event list.

Parameters

[in]

el

to return timer events for.

Returns

kq

Definition at line 625 of file event.c.

fr_event_list_num_fds()

uint64_t fr_event_list_num_fds

(

fr_event_list_t *

el

)

Return the number of file descriptors is_registered with this event loop.

Definition at line 601 of file event.c.

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fr_event_list_num_timers()

uint64_t fr_event_list_num_timers

(

fr_event_list_t *

el

)

Return the number of timer events currently scheduled.

Parameters

[in]

el

to return timer events for.

Returns

number of timer events.

Definition at line 613 of file event.c.

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fr_event_list_reap_signal()

unsigned int fr_event_list_reap_signal	(	fr_event_list_t *	el,
		fr_time_delta_t	timeout,
		int	signal
	)

Send a signal to all the processes we have in our reap list, and reap them.

Parameters

[in]	el	containing the processes to reap.
[in]	timeout	how long to wait before we signal the processes.
[in]	signal	to send to processes. Should be a fatal signal.

Returns

The number of processes reaped.

Definition at line 2004 of file event.c.

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fr_event_list_set_time_func()

void fr_event_list_set_time_func	(	fr_event_list_t *	el,
		fr_event_time_source_t	func
	)

Override event list time source.

Parameters

[in]	el	to set new time function for.
[in]	func	to set.

Definition at line 2971 of file event.c.

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fr_event_list_time()

fr_time_t fr_event_list_time

(

fr_event_list_t *

el

)

Get the current server time according to the event list.

If the event list is currently dispatching events, we return the time this iteration of the event list started.

If the event list is not currently dispatching events, we return the current system time.

Parameters

[in]

el

to get time from.

Returns

the current time according to the event list.

Definition at line 643 of file event.c.

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fr_event_loop()

int fr_event_loop

(

fr_event_list_t *

el

)

Run an event loop.

Note

Will not return until fr_event_loop_exit is called.

Parameters

[in]

el

to start processing.

Definition at line 2766 of file event.c.

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fr_event_loop_exit()

void fr_event_loop_exit	(	fr_event_list_t *	el,
		int	code
	)

Signal an event loop exit with the specified code.

The event loop will complete its current iteration, and then exit with the specified code.

Parameters

[in]	el	to signal to exit.
[in]	code	for fr_event_loop to return.

Definition at line 2744 of file event.c.

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fr_event_loop_exiting()

bool fr_event_loop_exiting

(

fr_event_list_t *

el

)

Check to see whether the event loop is in the process of exiting.

Parameters

[in]

el

to check.

Definition at line 2755 of file event.c.

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fr_event_post_delete()

int fr_event_post_delete	(	fr_event_list_t *	el,
		fr_event_timer_cb_t	callback,
		void *	uctx
	)

Delete a post-event callback from the event list.

Parameters

[in]	el	Containing the timer events.
[in]	callback	The post-processing callback.
[in]	uctx	for the callback.

Returns

• < 0 on error
• 0 on success

Definition at line 2335 of file event.c.

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fr_event_post_insert()

int fr_event_post_insert	(	fr_event_list_t *	el,
		fr_event_timer_cb_t	callback,
		void *	uctx
	)

Add a post-event callback to the event list.

Events are serviced in insert order. i.e. insert A, B, we then have A running before B.

Parameters

[in]	el	Containing the timer events.
[in]	callback	The post-processing callback.
[in]	uctx	for the callback.

Returns

• < 0 on error
• 0 on success

Definition at line 2313 of file event.c.

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fr_event_pre_delete()

int fr_event_pre_delete	(	fr_event_list_t *	el,
		fr_event_status_cb_t	callback,
		void *	uctx
	)

Delete a pre-event callback from the event list.

Parameters

[in]	el	Containing the timer events.
[in]	callback	The pre-processing callback.
[in]	uctx	for the callback.

Returns

• < 0 on error
• 0 on success

Definition at line 2281 of file event.c.

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fr_event_pre_insert()

int fr_event_pre_insert	(	fr_event_list_t *	el,
		fr_event_status_cb_t	callback,
		void *	uctx
	)

Add a pre-event callback to the event list.

Events are serviced in insert order. i.e. insert A, B, we then have A running before B.

Parameters

[in]	el	Containing the timer events.
[in]	callback	The pre-processing callback.
[in]	uctx	for the callback.

Returns

• < 0 on error
• 0 on success

Definition at line 2259 of file event.c.

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fr_event_service()

void fr_event_service

(

fr_event_list_t *

el

)

Service any outstanding timer or file descriptor events.

Parameters

[in]

el

containing events to service.

Definition at line 2549 of file event.c.

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fr_event_timer_cmp()

static int8_t fr_event_timer_cmp ( void const *  a, void const *  b  )

static

Compare two timer events to see which one should occur first.

Parameters

[in]	a	the first timer event.
[in]	b	the second timer event.

Returns

• +1 if a should occur later than b.
• -1 if a should occur earlier than b.
• 0 if both events occur at the same time.

Definition at line 576 of file event.c.

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fr_event_timer_delete()

int fr_event_timer_delete

(

fr_event_timer_t const **

ev_p

)

Delete a timer event from the event list.

Parameters

[in]

ev_p

of the event being deleted.

Returns

• 0 on success.
• -1 on failure.

Definition at line 1611 of file event.c.

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fr_event_timer_run()

int fr_event_timer_run	(	fr_event_list_t *	el,
		fr_time_t *	when
	)

Run a single scheduled timer event.

Parameters

[in]	el	containing the timer events.
[in]	when	Process events scheduled to run before or at this time.

Returns

• 0 no timer events fired.
• 1 a timer event fired.

Definition at line 2363 of file event.c.

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fr_event_timer_when()

fr_time_t fr_event_timer_when

(

fr_event_timer_t const *

ev

)

Internal timestamp representing when the timer should fire.

Returns

When the timestamp should fire.

Definition at line 1633 of file event.c.

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fr_event_user_trigger()

int fr_event_user_trigger	(	fr_event_list_t *	el,
		fr_event_user_t *	ev
	)

Trigger a user event.

Parameters

[in]	el	containing the user event.
[in]	ev	Handle for the user event.

Returns

• 0 on success.
• -1 on error.

Definition at line 2233 of file event.c.

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if()

if

(

)

Definition at line 2105 of file event.c.

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talloc_free()

talloc_free

(

reap

)

waitpid()

waitpid	(	reap->pid_ev->	pid,
		&	status,
		0
	)

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Variable Documentation

__pad0__

force __pad0__

Definition at line 2096 of file event.c.

filter_maps

fr_event_func_map_t filter_maps[]

static

Definition at line 172 of file event.c.

fr_event_fd_type_table

fr_table_num_sorted_t const fr_event_fd_type_table[]

static

Initial value:

= {
        { L("directory"),       FR_EVENT_FD_DIRECTORY },
        { L("file"),            FR_EVENT_FD_FILE },
        { L("pcap"),            FR_EVENT_FD_PCAP },
        { L("socket"),          FR_EVENT_FD_SOCKET }
}

Definition at line 283 of file event.c.

fr_event_fd_type_table_len

size_t fr_event_fd_type_table_len = NUM_ELEMENTS(fr_event_fd_type_table)

static

Definition at line 289 of file event.c.

kevent_filter_table

fr_table_num_sorted_t const kevent_filter_table[]

static

Initial value:

= {
 
 
 
 
 
 
 
 
 
        { L("EVFILT_PROC"),     EVFILT_PROC },
        { L("EVFILT_READ"),     EVFILT_READ },
        { L("EVFILT_SIGNAL"),   EVFILT_SIGNAL },
        { L("EVFILT_TIMER"),    EVFILT_TIMER },
        { L("EVFILT_VNODE"),    EVFILT_VNODE },
        { L("EVFILT_WRITE"),    EVFILT_WRITE }
}

Definition at line 76 of file event.c.

kevent_filter_table_len

size_t kevent_filter_table_len = NUM_ELEMENTS(kevent_filter_table)

static

Definition at line 93 of file event.c.

processed

return processed

Definition at line 2129 of file event.c.