| event2/bufferevent.h(3) | Library Functions Manual | event2/bufferevent.h(3) |
event2/bufferevent.h - Functions for buffering data for network sending or receiving.
#include <event2/visibility.h>
#include <event2/event-config.h>
#include <event2/util.h>
struct bufferevent
An opaque type for handling buffered IO.
#define EV_RATE_LIMIT_MAX EV_SSIZE_MAX
Maximum configurable rate- or burst-limit.
Bufferevent event codes
These flags are passed as arguments to a bufferevent's event callback.
#define BEV_EVENT_READING 0x01
error encountered while reading #define BEV_EVENT_WRITING 0x02
error encountered while writing #define BEV_EVENT_EOF 0x10
eof file reached #define BEV_EVENT_ERROR 0x20
unrecoverable error encountered #define BEV_EVENT_TIMEOUT 0x40
user-specified timeout reached #define BEV_EVENT_CONNECTED 0x80
connect operation finished.
typedef void(* bufferevent_data_cb) (struct
bufferevent *bev, void *ctx)
A read or write callback for a bufferevent. typedef void(*
bufferevent_event_cb) (struct bufferevent *bev, short what,
void *ctx)
An event/error callback for a bufferevent.
enum bufferevent_flush_mode { BEV_NORMAL = 0,
BEV_FLUSH = 1, BEV_FINISHED = 2 } Flags that can be passed
into filters to let them know how to deal with the incoming data. "
enum bufferevent_options { BEV_OPT_CLOSE_ON_FREE = (1<<0),
BEV_OPT_THREADSAFE = (1<<1), BEV_OPT_DEFER_CALLBACKS =
(1<<2), BEV_OPT_UNLOCK_CALLBACKS = (1<<3) } Options
that can be specified when creating a bufferevent. "
enum bufferevent_trigger_options { BEV_TRIG_IGNORE_WATERMARKS =
(1<<16), BEV_TRIG_DEFER_CALLBACKS = BEV_OPT_DEFER_CALLBACKS }
Flags for bufferevent_trigger(_event) that modify when and how to trigger
the callback. "
EVENT2_EXPORT_SYMBOL int
bufferevent_add_to_rate_limit_group (struct bufferevent *bev,
struct bufferevent_rate_limit_group *g)
Add 'bev' to the list of bufferevents whose aggregate reading and writing
is restricted by 'g'. EVENT2_EXPORT_SYMBOL int
bufferevent_base_set (struct event_base *base, struct
bufferevent *bufev)
Assign a bufferevent to a specific event_base.
EVENT2_EXPORT_SYMBOL int bufferevent_decref (struct
bufferevent *bufev)
Public interface to manually decrement the reference count of a
bufferevent. EVENT2_EXPORT_SYMBOL int bufferevent_disable
(struct bufferevent *bufev, short event)
Disable a bufferevent. EVENT2_EXPORT_SYMBOL int
bufferevent_enable (struct bufferevent *bufev, short
event)
Enable a bufferevent. EVENT2_EXPORT_SYMBOL int
bufferevent_flush (struct bufferevent *bufev, short iotype,
enum bufferevent_flush_mode mode)
Triggers the bufferevent to produce more data if possible.
EVENT2_EXPORT_SYMBOL void bufferevent_free (struct bufferevent
*bufev)
Deallocate the storage associated with a bufferevent structure.
EVENT2_EXPORT_SYMBOL struct event_base * bufferevent_get_base
(struct bufferevent *bev)
Return the event_base used by a bufferevent.
EVENT2_EXPORT_SYMBOL short bufferevent_get_enabled (struct
bufferevent *bufev)
Return the events that are enabled on a given bufferevent.
EVENT2_EXPORT_SYMBOL struct evbuffer * bufferevent_get_input
(struct bufferevent *bufev)
Returns the input buffer. EVENT2_EXPORT_SYMBOL ev_ssize_t
bufferevent_get_max_single_read (struct bufferevent *bev)
Get the current size limit for single read operation.
EVENT2_EXPORT_SYMBOL ev_ssize_t bufferevent_get_max_single_write
(struct bufferevent *bev)
Get the current size limit for single write operation.
EVENT2_EXPORT_SYMBOL ev_ssize_t bufferevent_get_max_to_read (struct
bufferevent *bev)
EVENT2_EXPORT_SYMBOL ev_ssize_t bufferevent_get_max_to_write (struct
bufferevent *bev)
EVENT2_EXPORT_SYMBOL struct evbuffer * bufferevent_get_output
(struct bufferevent *bufev)
Returns the output buffer. EVENT2_EXPORT_SYMBOL int
bufferevent_get_priority (const struct bufferevent *bufev)
Return the priority of a bufferevent. EVENT2_EXPORT_SYMBOL const
struct ev_token_bucket_cfg * bufferevent_get_token_bucket_cfg (const
struct bufferevent *bev)
EVENT2_EXPORT_SYMBOL struct bufferevent *
bufferevent_get_underlying (struct bufferevent *bufev)
Returns the underlying bufferevent associated with a bufferevent (if the
bufferevent is a wrapper), or NULL if there is no underlying bufferevent.
EVENT2_EXPORT_SYMBOL void bufferevent_getcb (struct
bufferevent *bufev, bufferevent_data_cb *readcb_ptr,
bufferevent_data_cb *writecb_ptr, bufferevent_event_cb
*eventcb_ptr, void **cbarg_ptr)
Retrieves the callbacks for a bufferevent. EVENT2_EXPORT_SYMBOL
evutil_socket_t bufferevent_getfd (struct bufferevent
*bufev)
Returns the file descriptor associated with a bufferevent, or -1 if no file
descriptor is associated with the bufferevent. EVENT2_EXPORT_SYMBOL int
bufferevent_getwatermark (struct bufferevent *bufev, short
events, size_t *lowmark, size_t *highmark)
Retrieves the watermarks for read or write events.
EVENT2_EXPORT_SYMBOL void bufferevent_incref (struct
bufferevent *bufev)
Public interface to manually increase the reference count of a bufferevent
this is useful in situations where a user may reference the bufferevent
somewhere eles (unknown to libevent) EVENT2_EXPORT_SYMBOL void
bufferevent_lock (struct bufferevent *bufev)
Acquire the lock on a bufferevent. EVENT2_EXPORT_SYMBOL struct
bufferevent * bufferevent_pair_get_partner (struct
bufferevent *bev)
Given one bufferevent returned by bufferevent_pair_new(),
returns the other one if it still exists. EVENT2_EXPORT_SYMBOL
int bufferevent_pair_new (struct event_base *base, int
options, struct bufferevent *pair[2])
Allocate a pair of linked bufferevents. EVENT2_EXPORT_SYMBOL int
bufferevent_priority_set (struct bufferevent *bufev, int pri)
Assign a priority to a bufferevent. EVENT2_EXPORT_SYMBOL void
bufferevent_rate_limit_group_free (struct
bufferevent_rate_limit_group *)
Free a rate-limiting group. EVENT2_EXPORT_SYMBOL void
bufferevent_rate_limit_group_get_totals (struct
bufferevent_rate_limit_group *grp, ev_uint64_t *total_read_out, ev_uint64_t
*total_written_out)
Inspect the total bytes read/written on a group. EVENT2_EXPORT_SYMBOL
struct bufferevent_rate_limit_group *
bufferevent_rate_limit_group_new (struct event_base *base,
const struct ev_token_bucket_cfg *cfg)
Create a new rate-limit group for bufferevents. EVENT2_EXPORT_SYMBOL
void bufferevent_rate_limit_group_reset_totals (struct
bufferevent_rate_limit_group *grp)
Reset the total bytes read/written on a group. EVENT2_EXPORT_SYMBOL
int bufferevent_rate_limit_group_set_cfg (struct
bufferevent_rate_limit_group *, const struct ev_token_bucket_cfg *)
Change the rate-limiting settings for a given rate-limiting group.
EVENT2_EXPORT_SYMBOL int bufferevent_rate_limit_group_set_min_share
(struct bufferevent_rate_limit_group *, size_t)
Change the smallest quantum we're willing to allocate to any single
bufferevent in a group for reading or writing at a time.
EVENT2_EXPORT_SYMBOL size_t bufferevent_read (struct
bufferevent *bufev, void *data, size_t size)
Read data from a bufferevent buffer. EVENT2_EXPORT_SYMBOL int
bufferevent_read_buffer (struct bufferevent *bufev, struct
evbuffer *buf)
Read data from a bufferevent buffer into an evbuffer.
EVENT2_EXPORT_SYMBOL int bufferevent_remove_from_rate_limit_group
(struct bufferevent *bev)
Remove 'bev' from its current rate-limit group (if any).
EVENT2_EXPORT_SYMBOL int bufferevent_set_max_single_read (struct
bufferevent *bev, size_t size)
Set the size limit for single read operation. EVENT2_EXPORT_SYMBOL int
bufferevent_set_max_single_write (struct bufferevent *bev,
size_t size)
Set the size limit for single write operation. EVENT2_EXPORT_SYMBOL
int bufferevent_set_rate_limit (struct bufferevent *bev,
struct ev_token_bucket_cfg *cfg)
Set the rate-limit of a the bufferevent 'bev' to the one specified in
'cfg'. EVENT2_EXPORT_SYMBOL int bufferevent_set_timeouts (struct
bufferevent *bufev, const struct timeval *timeout_read, const struct
timeval *timeout_write)
Set the read and write timeout for a bufferevent. EVENT2_EXPORT_SYMBOL
void bufferevent_setcb (struct bufferevent *bufev,
bufferevent_data_cb readcb, bufferevent_data_cb writecb,
bufferevent_event_cb eventcb, void *cbarg)
Changes the callbacks for a bufferevent. EVENT2_EXPORT_SYMBOL int
bufferevent_setfd (struct bufferevent *bufev,
evutil_socket_t fd)
Changes the file descriptor on which the bufferevent operates.
EVENT2_EXPORT_SYMBOL void bufferevent_setwatermark (struct
bufferevent *bufev, short events, size_t lowmark, size_t highmark)
Sets the watermarks for read and write events. EVENT2_EXPORT_SYMBOL
int bufferevent_socket_connect (struct bufferevent *, const
struct sockaddr *, int)
Launch a connect() attempt with a socket-based bufferevent.
EVENT2_EXPORT_SYMBOL int bufferevent_socket_connect_hostname (struct
bufferevent *, struct evdns_base *, int, const char *, int)
Resolve the hostname 'hostname' and connect to it as with
bufferevent_socket_connect(). EVENT2_EXPORT_SYMBOL
int bufferevent_socket_get_dns_error (struct bufferevent *bev)
Return the error code for the last failed DNS lookup attempt made by
bufferevent_socket_connect_hostname().
EVENT2_EXPORT_SYMBOL struct bufferevent *
bufferevent_socket_new (struct event_base *base,
evutil_socket_t fd, int options)
Create a new socket bufferevent over an existing socket.
EVENT2_EXPORT_SYMBOL void bufferevent_trigger (struct
bufferevent *bufev, short iotype, int options)
Triggers bufferevent data callbacks. EVENT2_EXPORT_SYMBOL void
bufferevent_trigger_event (struct bufferevent *bufev, short
what, int options)
Triggers the bufferevent event callback. EVENT2_EXPORT_SYMBOL void
bufferevent_unlock (struct bufferevent *bufev)
Release the lock on a bufferevent. EVENT2_EXPORT_SYMBOL int
bufferevent_write (struct bufferevent *bufev, const void
*data, size_t size)
Write data to a bufferevent buffer. EVENT2_EXPORT_SYMBOL int
bufferevent_write_buffer (struct bufferevent *bufev, struct
evbuffer *buf)
Write data from an evbuffer to a bufferevent buffer.
EVENT2_EXPORT_SYMBOL void ev_token_bucket_cfg_free (struct
ev_token_bucket_cfg *cfg)
Free all storage held in 'cfg'. EVENT2_EXPORT_SYMBOL struct
ev_token_bucket_cfg * ev_token_bucket_cfg_new (size_t read_rate,
size_t read_burst, size_t write_rate, size_t write_burst, const struct
timeval *tick_len)
Initialize and return a new object to configure the rate-limiting behavior
of bufferevents.
Rate limit inspection
Return the current read or write bucket size for a bufferevent.
If it is not configured with a per-bufferevent ratelimit, return EV_SSIZE_MAX. This function does not inspect the group limit, if any. Note that it can return a negative value if the bufferevent has been made to read or write more than its limit.
EVENT2_EXPORT_SYMBOL ev_ssize_t bufferevent_get_read_limit (struct
bufferevent *bev)
EVENT2_EXPORT_SYMBOL ev_ssize_t bufferevent_get_write_limit (struct
bufferevent *bev)
Group Rate limit inspection
Return the read or write bucket size for a bufferevent rate limit group.
Note that it can return a negative value if bufferevents in the group have been made to read or write more than their limits.
EVENT2_EXPORT_SYMBOL ev_ssize_t
bufferevent_rate_limit_group_get_read_limit (struct
bufferevent_rate_limit_group *)
EVENT2_EXPORT_SYMBOL ev_ssize_t
bufferevent_rate_limit_group_get_write_limit (struct
bufferevent_rate_limit_group *)
Rate limit manipulation
Subtract a number of bytes from a bufferevent's read or write bucket.
The decrement value can be negative, if you want to manually refill the bucket. If the change puts the bucket above or below zero, the bufferevent will resume or suspend reading writing as appropriate. These functions make no change in the buckets for the bufferevent's group, if any.
Returns 0 on success, -1 on internal error.
EVENT2_EXPORT_SYMBOL int bufferevent_decrement_read_limit (struct
bufferevent *bev, ev_ssize_t decr)
EVENT2_EXPORT_SYMBOL int bufferevent_decrement_write_limit (struct
bufferevent *bev, ev_ssize_t decr)
Group rate limit manipulation
Subtract a number of bytes from a bufferevent rate-limiting group's read or
write bucket.
The decrement value can be negative, if you want to manually refill the bucket. If the change puts the bucket above or below zero, the bufferevents in the group will resume or suspend reading writing as appropriate.
Returns 0 on success, -1 on internal error.
EVENT2_EXPORT_SYMBOL int bufferevent_rate_limit_group_decrement_read
(struct bufferevent_rate_limit_group *, ev_ssize_t)
EVENT2_EXPORT_SYMBOL int bufferevent_rate_limit_group_decrement_write
(struct bufferevent_rate_limit_group *, ev_ssize_t)
enum bufferevent_filter_result { BEV_OK = 0,
BEV_NEED_MORE = 1, BEV_ERROR = 2 } Values that filters can
return. "
typedef enum bufferevent_filter_result(* bufferevent_filter_cb)
(struct evbuffer *src, struct evbuffer *dst, ev_ssize_t
dst_limit, enum bufferevent_flush_mode mode, void *ctx)
A callback function to implement a filter for a bufferevent.
EVENT2_EXPORT_SYMBOL struct bufferevent *
bufferevent_filter_new (struct bufferevent *underlying,
bufferevent_filter_cb input_filter, bufferevent_filter_cb
output_filter, int options, void(*free_context)(void *), void *ctx)
Allocate a new filtering bufferevent on top of an existing bufferevent.
Functions for buffering data for network sending or receiving.
Bufferevents are higher level than evbuffers: each has an underlying evbuffer for reading and one for writing, and callbacks that are invoked under certain circumstances.
A bufferevent provides input and output buffers that get filled and drained automatically. The user of a bufferevent no longer deals directly with the I/O, but instead is reading from input and writing to output buffers.
Once initialized, the bufferevent structure can be used repeatedly with bufferevent_enable() and bufferevent_disable().
When reading is enabled, the bufferevent will try to read from the file descriptor onto its input buffer, and call the read callback. When writing is enabled, the bufferevent will try to write data onto its file descriptor when the output buffer has enough data, and call the write callback when the output buffer is sufficiently drained.
Bufferevents come in several flavors, including:
connect operation finished.
Maximum configurable rate- or burst-limit.
A read or write callback for a bufferevent. The read callback is triggered when new data arrives in the input buffer and the amount of readable data exceed the low watermark which is 0 by default.
The write callback is triggered if the write buffer has been exhausted or fell below its low watermark.
Parameters:
An event/error callback for a bufferevent. The event callback is triggered if either an EOF condition or another unrecoverable error was encountered.
For bufferevents with deferred callbacks, this is a bitwise OR of all errors that have happened on the bufferevent since the last callback invocation.
Parameters:
A callback function to implement a filter for a bufferevent.
Parameters:
Returns:
Values that filters can return.
Enumerator
Flags that can be passed into filters to let them know how to deal with the incoming data.
Enumerator
Options that can be specified when creating a bufferevent.
Enumerator
Flags for bufferevent_trigger(_event) that modify when and how to trigger the callback.
Enumerator
Add 'bev' to the list of bufferevents whose aggregate reading and writing is restricted by 'g'. If 'g' is NULL, remove 'bev' from its current group.
A bufferevent may belong to no more than one rate-limit group at a time. If 'bev' is already a member of a group, it will be removed from its old group before being added to 'g'.
Return 0 on success and -1 on failure.
Assign a bufferevent to a specific event_base. NOTE that only socket bufferevents support this function.
Parameters:
Returns:
See also:
Public interface to manually decrement the reference count of a bufferevent. Warning: make sure you know what you're doing. This is mainly used in conjunction with bufferevent_incref(). This will free up all data associated with a bufferevent if the reference count hits 0.
Parameters:
Returns:
Disable a bufferevent.
Parameters:
Returns:
See also:
Enable a bufferevent.
Parameters:
Returns:
See also:
Allocate a new filtering bufferevent on top of an existing bufferevent.
Parameters:
Triggers the bufferevent to produce more data if possible.
Parameters:
Returns:
Deallocate the storage associated with a bufferevent structure. If there is pending data to write on the bufferevent, it probably won't be flushed before the bufferevent is freed.
Parameters:
Return the events that are enabled on a given bufferevent.
Parameters:
Returns:
Returns the input buffer. The user MUST NOT set the callback on this buffer.
Parameters:
Returns:
Get the current size limit for single read operation.
Get the current size limit for single write operation.
Returns the output buffer. The user MUST NOT set the callback on this buffer.
When filters are being used, the filters need to be manually triggered if the output buffer was manipulated.
Parameters:
Returns:
Return the priority of a bufferevent. Only supported for socket bufferevents
Retrieves the callbacks for a bufferevent.
Parameters:
See also:
Retrieves the watermarks for read or write events. Returns non-zero if events contains not only EV_READ or EV_WRITE. Returns zero if events equal EV_READ or EV_WRITE
Parameters:
Public interface to manually increase the reference count of a bufferevent this is useful in situations where a user may reference the bufferevent somewhere eles (unknown to libevent)
Parameters:
Acquire the lock on a bufferevent. Has no effect if locking was not enabled with BEV_OPT_THREADSAFE.
Given one bufferevent returned by bufferevent_pair_new(), returns the other one if it still exists. Otherwise returns NULL.
Allocate a pair of linked bufferevents. The bufferevents behave as would two bufferevent_sock instances connected to opposite ends of a socketpair(), except that no internal socketpair is allocated.
Parameters:
Returns:
Assign a priority to a bufferevent. Only supported for socket bufferevents.
Parameters:
Returns:
Free a rate-limiting group. The group must have no members when this function is called.
Inspect the total bytes read/written on a group. Set the variable pointed to by total_read_out to the total number of bytes ever read on grp, and the variable pointed to by total_written_out to the total number of bytes ever written on grp.
Create a new rate-limit group for bufferevents. A rate-limit group constrains the maximum number of bytes sent and received, in toto, by all of its bufferevents.
Parameters:
Note that all rate-limits hare are currently best-effort: future versions of Libevent may implement them more tightly.
Note also that only some bufferevent types currently respect rate-limiting. They are: socket-based bufferevents (normal and IOCP-based), and SSL-based bufferevents.
Reset the total bytes read/written on a group. Reset the number of bytes read or written on grp as given by bufferevent_rate_limit_group_reset_totals().
Change the rate-limiting settings for a given rate-limiting group. Return 0 on success, -1 on failure.
Change the smallest quantum we're willing to allocate to any single bufferevent in a group for reading or writing at a time. The rationale is that, because of TCP/IP protocol overheads and kernel behavior, if a rate-limiting group is so tight on bandwidth that you're only willing to send 1 byte per tick per bufferevent, you might instead want to batch up the reads and writes so that you send N bytes per 1/N of the bufferevents (chosen at random) each tick, so you still wind up send 1 byte per tick per bufferevent on average, but you don't send so many tiny packets.
The default min-share is currently 64 bytes.
Returns 0 on success, -1 on faulre.
Read data from a bufferevent buffer. The bufferevent_read() function is used to read data from the input buffer.
Parameters:
Returns:
Read data from a bufferevent buffer into an evbuffer. This avoids memory copies.
Parameters:
Returns:
Remove 'bev' from its current rate-limit group (if any).
Set the size limit for single read operation. Set to 0 for a reasonable default.
Return 0 on success and -1 on failure.
Set the size limit for single write operation. Set to 0 for a reasonable default.
Return 0 on success and -1 on failure.
Set the rate-limit of a the bufferevent 'bev' to the one specified in 'cfg'. If 'cfg' is NULL, disable any per-bufferevent rate-limiting on 'bev'.
Note that only some bufferevent types currently respect rate-limiting. They are: socket-based bufferevents (normal and IOCP-based), and SSL-based bufferevents.
Return 0 on sucess, -1 on failure.
Set the read and write timeout for a bufferevent. A bufferevent's timeout will fire the first time that the indicated amount of time has elapsed since a successful read or write operation, during which the bufferevent was trying to read or write.
(In other words, if reading or writing is disabled, or if the bufferevent's read or write operation has been suspended because there's no data to write, or not enough banwidth, or so on, the timeout isn't active. The timeout only becomes active when we we're willing to actually read or write.)
Calling bufferevent_enable or setting a timeout for a bufferevent whose timeout is already pending resets its timeout.
If the timeout elapses, the corresponding operation (EV_READ or EV_WRITE) becomes disabled until you re-enable it again. The bufferevent's event callback is called with the BEV_EVENT_TIMEOUT|BEV_EVENT_READING or BEV_EVENT_TIMEOUT|BEV_EVENT_WRITING.
Parameters:
Changes the callbacks for a bufferevent.
Parameters:
See also:
Changes the file descriptor on which the bufferevent operates. Not supported for all bufferevent types.
Parameters:
Sets the watermarks for read and write events. On input, a bufferevent does not invoke the user read callback unless there is at least low watermark data in the buffer. If the read buffer is beyond the high watermark, the bufferevent stops reading from the network.
On output, the user write callback is invoked whenever the buffered data falls below the low watermark. Filters that write to this bufev will try not to write more bytes to this buffer than the high watermark would allow, except when flushing.
Parameters:
Launch a connect() attempt with a socket-based bufferevent. When the connect succeeds, the eventcb will be invoked with BEV_EVENT_CONNECTED set.
If the bufferevent does not already have a socket set, we allocate a new socket here and make it nonblocking before we begin.
If no address is provided, we assume that the socket is already connecting, and configure the bufferevent so that a BEV_EVENT_CONNECTED event will be yielded when it is done connecting.
Parameters:
Returns:
Resolve the hostname 'hostname' and connect to it as with bufferevent_socket_connect().
Parameters:
Returns:
Recognized hostname formats are:
www.example.com (hostname) 1.2.3.4 (ipv4address) ::1 (ipv6address) [::1] ([ipv6address])
Performance note: If you do not provide an evdns_base, this function may block while it waits for a DNS response. This is probably not what you want.
Return the error code for the last failed DNS lookup attempt made by bufferevent_socket_connect_hostname().
Parameters:
Returns:
See also:
Create a new socket bufferevent over an existing socket.
Parameters:
Returns:
See also:
Triggers bufferevent data callbacks. The function will honor watermarks unless options contain BEV_TRIG_IGNORE_WATERMARKS. If the options contain BEV_OPT_DEFER_CALLBACKS, the callbacks are deferred.
Parameters:
Triggers the bufferevent event callback. If the options contain BEV_OPT_DEFER_CALLBACKS, the callbacks are deferred.
Parameters:
Release the lock on a bufferevent. Has no effect if locking was not enabled with BEV_OPT_THREADSAFE.
Write data to a bufferevent buffer. The bufferevent_write() function can be used to write data to the file descriptor. The data is appended to the output buffer and written to the descriptor automatically as it becomes available for writing.
Parameters:
Returns:
See also:
Write data from an evbuffer to a bufferevent buffer. The evbuffer is being drained as a result.
Parameters:
Returns:
See also:
Free all storage held in 'cfg'. Note: 'cfg' is not currently reference-counted; it is not safe to free it until no bufferevent is using it.
Initialize and return a new object to configure the rate-limiting behavior of bufferevents.
Parameters:
Note that all rate-limits hare are currently best-effort: future versions of Libevent may implement them more tightly.
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| Tue Jan 31 2017 | libevent |