2 * Copyright (C) 2004-2009 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1998-2002 Internet Software Consortium.
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
18 /* $Id: socket.h,v 1.85.58.3 2009-01-29 22:40:35 jinmei Exp $ */
21 #define ISC_SOCKET_H 1
27 /*! \file isc/socket.h
28 * \brief Provides TCP and UDP sockets for network I/O. The sockets are event
29 * sources in the task system.
31 * When I/O completes, a completion event for the socket is posted to the
32 * event queue of the task which requested the I/O.
35 * The module ensures appropriate synchronization of data structures it
36 * creates and manipulates.
37 * Clients of this module must not be holding a socket's task's lock when
38 * making a call that affects that socket. Failure to follow this rule
39 * can result in deadlock.
40 * The caller must ensure that isc_socketmgr_destroy() is called only
41 * once for a given manager.
44 * No anticipated impact.
50 * No anticipated impact.
61 #include <isc/types.h>
62 #include <isc/event.h>
63 #include <isc/eventclass.h>
65 #include <isc/region.h>
66 #include <isc/sockaddr.h>
76 * Maximum number of buffers in a scatter/gather read/write. The operating
77 * system in use must support at least this number (plus one on some.)
79 #define ISC_SOCKET_MAXSCATTERGATHER 8
82 * In isc_socket_bind() set socket option SO_REUSEADDR prior to calling
83 * bind() if a non zero port is specified (AF_INET and AF_INET6).
85 #define ISC_SOCKET_REUSEADDRESS 0x01U
88 * Statistics counters. Used as isc_statscounter_t values.
91 isc_sockstatscounter_udp4open = 0,
92 isc_sockstatscounter_udp6open = 1,
93 isc_sockstatscounter_tcp4open = 2,
94 isc_sockstatscounter_tcp6open = 3,
95 isc_sockstatscounter_unixopen = 4,
97 isc_sockstatscounter_udp4openfail = 5,
98 isc_sockstatscounter_udp6openfail = 6,
99 isc_sockstatscounter_tcp4openfail = 7,
100 isc_sockstatscounter_tcp6openfail = 8,
101 isc_sockstatscounter_unixopenfail = 9,
103 isc_sockstatscounter_udp4close = 10,
104 isc_sockstatscounter_udp6close = 11,
105 isc_sockstatscounter_tcp4close = 12,
106 isc_sockstatscounter_tcp6close = 13,
107 isc_sockstatscounter_unixclose = 14,
108 isc_sockstatscounter_fdwatchclose = 15,
110 isc_sockstatscounter_udp4bindfail = 16,
111 isc_sockstatscounter_udp6bindfail = 17,
112 isc_sockstatscounter_tcp4bindfail = 18,
113 isc_sockstatscounter_tcp6bindfail = 19,
114 isc_sockstatscounter_unixbindfail = 20,
115 isc_sockstatscounter_fdwatchbindfail = 21,
117 isc_sockstatscounter_udp4connect = 22,
118 isc_sockstatscounter_udp6connect = 23,
119 isc_sockstatscounter_tcp4connect = 24,
120 isc_sockstatscounter_tcp6connect = 25,
121 isc_sockstatscounter_unixconnect = 26,
122 isc_sockstatscounter_fdwatchconnect = 27,
124 isc_sockstatscounter_udp4connectfail = 28,
125 isc_sockstatscounter_udp6connectfail = 29,
126 isc_sockstatscounter_tcp4connectfail = 30,
127 isc_sockstatscounter_tcp6connectfail = 31,
128 isc_sockstatscounter_unixconnectfail = 32,
129 isc_sockstatscounter_fdwatchconnectfail = 33,
131 isc_sockstatscounter_tcp4accept = 34,
132 isc_sockstatscounter_tcp6accept = 35,
133 isc_sockstatscounter_unixaccept = 36,
135 isc_sockstatscounter_tcp4acceptfail = 37,
136 isc_sockstatscounter_tcp6acceptfail = 38,
137 isc_sockstatscounter_unixacceptfail = 39,
139 isc_sockstatscounter_udp4sendfail = 40,
140 isc_sockstatscounter_udp6sendfail = 41,
141 isc_sockstatscounter_tcp4sendfail = 42,
142 isc_sockstatscounter_tcp6sendfail = 43,
143 isc_sockstatscounter_unixsendfail = 44,
144 isc_sockstatscounter_fdwatchsendfail = 45,
146 isc_sockstatscounter_udp4recvfail = 46,
147 isc_sockstatscounter_udp6recvfail = 47,
148 isc_sockstatscounter_tcp4recvfail = 48,
149 isc_sockstatscounter_tcp6recvfail = 49,
150 isc_sockstatscounter_unixrecvfail = 50,
151 isc_sockstatscounter_fdwatchrecvfail = 51,
153 isc_sockstatscounter_max = 52
160 struct isc_socketevent {
161 ISC_EVENT_COMMON(isc_socketevent_t);
162 isc_result_t result; /*%< OK, EOF, whatever else */
163 unsigned int minimum; /*%< minimum i/o for event */
164 unsigned int n; /*%< bytes read or written */
165 unsigned int offset; /*%< offset into buffer list */
166 isc_region_t region; /*%< for single-buffer i/o */
167 isc_bufferlist_t bufferlist; /*%< list of buffers */
168 isc_sockaddr_t address; /*%< source address */
169 isc_time_t timestamp; /*%< timestamp of packet recv */
170 struct in6_pktinfo pktinfo; /*%< ipv6 pktinfo */
171 isc_uint32_t attributes; /*%< see below */
172 isc_eventdestructor_t destroy; /*%< original destructor */
175 typedef struct isc_socket_newconnev isc_socket_newconnev_t;
176 struct isc_socket_newconnev {
177 ISC_EVENT_COMMON(isc_socket_newconnev_t);
178 isc_socket_t * newsocket;
179 isc_result_t result; /*%< OK, EOF, whatever else */
180 isc_sockaddr_t address; /*%< source address */
183 typedef struct isc_socket_connev isc_socket_connev_t;
184 struct isc_socket_connev {
185 ISC_EVENT_COMMON(isc_socket_connev_t);
186 isc_result_t result; /*%< OK, EOF, whatever else */
191 * _ATTACHED: Internal use only.
192 * _TRUNC: Packet was truncated on receive.
193 * _CTRUNC: Packet control information was truncated. This can
194 * indicate that the packet is not complete, even though
195 * all the data is valid.
196 * _TIMESTAMP: The timestamp member is valid.
197 * _PKTINFO: The pktinfo member is valid.
198 * _MULTICAST: The UDP packet was received via a multicast transmission.
200 #define ISC_SOCKEVENTATTR_ATTACHED 0x80000000U /* internal */
201 #define ISC_SOCKEVENTATTR_TRUNC 0x00800000U /* public */
202 #define ISC_SOCKEVENTATTR_CTRUNC 0x00400000U /* public */
203 #define ISC_SOCKEVENTATTR_TIMESTAMP 0x00200000U /* public */
204 #define ISC_SOCKEVENTATTR_PKTINFO 0x00100000U /* public */
205 #define ISC_SOCKEVENTATTR_MULTICAST 0x00080000U /* public */
208 #define ISC_SOCKEVENT_ANYEVENT (0)
209 #define ISC_SOCKEVENT_RECVDONE (ISC_EVENTCLASS_SOCKET + 1)
210 #define ISC_SOCKEVENT_SENDDONE (ISC_EVENTCLASS_SOCKET + 2)
211 #define ISC_SOCKEVENT_NEWCONN (ISC_EVENTCLASS_SOCKET + 3)
212 #define ISC_SOCKEVENT_CONNECT (ISC_EVENTCLASS_SOCKET + 4)
217 #define ISC_SOCKEVENT_INTR (ISC_EVENTCLASS_SOCKET + 256)
218 #define ISC_SOCKEVENT_INTW (ISC_EVENTCLASS_SOCKET + 257)
221 isc_sockettype_udp = 1,
222 isc_sockettype_tcp = 2,
223 isc_sockettype_unix = 3,
224 isc_sockettype_fdwatch = 4
229 * How a socket should be shutdown in isc_socket_shutdown() calls.
231 #define ISC_SOCKSHUT_RECV 0x00000001 /*%< close read side */
232 #define ISC_SOCKSHUT_SEND 0x00000002 /*%< close write side */
233 #define ISC_SOCKSHUT_ALL 0x00000003 /*%< close them all */
238 * What I/O events to cancel in isc_socket_cancel() calls.
240 #define ISC_SOCKCANCEL_RECV 0x00000001 /*%< cancel recv */
241 #define ISC_SOCKCANCEL_SEND 0x00000002 /*%< cancel send */
242 #define ISC_SOCKCANCEL_ACCEPT 0x00000004 /*%< cancel accept */
243 #define ISC_SOCKCANCEL_CONNECT 0x00000008 /*%< cancel connect */
244 #define ISC_SOCKCANCEL_ALL 0x0000000f /*%< cancel everything */
249 * Flags for isc_socket_send() and isc_socket_recv() calls.
251 #define ISC_SOCKFLAG_IMMEDIATE 0x00000001 /*%< send event only if needed */
252 #define ISC_SOCKFLAG_NORETRY 0x00000002 /*%< drop failed UDP sends */
257 * Flags for fdwatchcreate.
259 #define ISC_SOCKFDWATCH_READ 0x00000001 /*%< watch for readable */
260 #define ISC_SOCKFDWATCH_WRITE 0x00000002 /*%< watch for writable */
264 *** Socket and Socket Manager Functions
266 *** Note: all Ensures conditions apply only if the result is success for
267 *** those functions which return an isc_result.
271 isc_socket_fdwatchcreate(isc_socketmgr_t *manager,
274 isc_sockfdwatch_t callback,
277 isc_socket_t **socketp);
279 * Create a new file descriptor watch socket managed by 'manager'.
283 *\li 'fd' is the already-opened file descriptor.
284 *\li This function is not available on Windows.
285 *\li The callback function is called "in-line" - this means the function
286 * needs to return as fast as possible, as all other I/O will be suspended
287 * until the callback completes.
291 *\li 'manager' is a valid manager
293 *\li 'socketp' is a valid pointer, and *socketp == NULL
299 * '*socketp' is attached to the newly created fdwatch socket
305 *\li #ISC_R_NORESOURCES
306 *\li #ISC_R_UNEXPECTED
310 isc_socket_create(isc_socketmgr_t *manager,
312 isc_sockettype_t type,
313 isc_socket_t **socketp);
315 * Create a new 'type' socket managed by 'manager'.
317 * For isc_sockettype_fdwatch sockets you should use isc_socket_fdwatchcreate()
318 * rather than isc_socket_create().
322 *\li 'pf' is the desired protocol family, e.g. PF_INET or PF_INET6.
326 *\li 'manager' is a valid manager
328 *\li 'socketp' is a valid pointer, and *socketp == NULL
330 *\li 'type' is not isc_sockettype_fdwatch
334 * '*socketp' is attached to the newly created socket
340 *\li #ISC_R_NORESOURCES
341 *\li #ISC_R_UNEXPECTED
345 isc_socket_cancel(isc_socket_t *sock, isc_task_t *task,
348 * Cancel pending I/O of the type specified by "how".
350 * Note: if "task" is NULL, then the cancel applies to all tasks using the
355 * \li "socket" is a valid socket
357 * \li "task" is NULL or a valid task
359 * "how" is a bitmask describing the type of cancelation to perform.
360 * The type ISC_SOCKCANCEL_ALL will cancel all pending I/O on this
363 * \li ISC_SOCKCANCEL_RECV:
364 * Cancel pending isc_socket_recv() calls.
366 * \li ISC_SOCKCANCEL_SEND:
367 * Cancel pending isc_socket_send() and isc_socket_sendto() calls.
369 * \li ISC_SOCKCANCEL_ACCEPT:
370 * Cancel pending isc_socket_accept() calls.
372 * \li ISC_SOCKCANCEL_CONNECT:
373 * Cancel pending isc_socket_connect() call.
377 isc_socket_shutdown(isc_socket_t *sock, unsigned int how);
379 * Shutdown 'socket' according to 'how'.
383 * \li 'socket' is a valid socket.
385 * \li 'task' is NULL or is a valid task.
387 * \li If 'how' is 'ISC_SOCKSHUT_RECV' or 'ISC_SOCKSHUT_ALL' then
389 * The read queue must be empty.
391 * No further read requests may be made.
393 * \li If 'how' is 'ISC_SOCKSHUT_SEND' or 'ISC_SOCKSHUT_ALL' then
395 * The write queue must be empty.
397 * No further write requests may be made.
401 isc_socket_attach(isc_socket_t *sock, isc_socket_t **socketp);
403 * Attach *socketp to socket.
407 * \li 'socket' is a valid socket.
409 * \li 'socketp' points to a NULL socket.
413 * \li *socketp is attached to socket.
417 isc_socket_detach(isc_socket_t **socketp);
419 * Detach *socketp from its socket.
423 * \li 'socketp' points to a valid socket.
425 * \li If '*socketp' is the last reference to the socket,
428 * There must be no pending I/O requests.
432 * \li *socketp is NULL.
434 * \li If '*socketp' is the last reference to the socket,
437 * The socket will be shutdown (both reading and writing)
440 * All resources used by the socket have been freed
444 isc_socket_open(isc_socket_t *sock);
446 * Open a new socket file descriptor of the given socket structure. It simply
447 * opens a new descriptor; all of the other parameters including the socket
448 * type are inherited from the existing socket. This function is provided to
449 * avoid overhead of destroying and creating sockets when many short-lived
450 * sockets are frequently opened and closed. When the efficiency is not an
451 * issue, it should be safer to detach the unused socket and re-create a new
452 * one. This optimization may not be available for some systems, in which
453 * case this function will return ISC_R_NOTIMPLEMENTED and must not be used.
455 * isc_socket_open() should not be called on sockets created by
456 * isc_socket_fdwatchcreate().
460 * \li there must be no other reference to this socket.
462 * \li 'socket' is a valid and previously closed by isc_socket_close()
464 * \li 'sock->type' is not isc_sockettype_fdwatch
467 * Same as isc_socket_create().
468 * \li ISC_R_NOTIMPLEMENTED
472 isc_socket_close(isc_socket_t *sock);
474 * Close a socket file descriptor of the given socket structure. This function
475 * is provided as an alternative to destroying an unused socket when overhead
476 * destroying/re-creating sockets can be significant, and is expected to be
477 * used with isc_socket_open(). This optimization may not be available for some
478 * systems, in which case this function will return ISC_R_NOTIMPLEMENTED and
481 * isc_socket_close() should not be called on sockets created by
482 * isc_socket_fdwatchcreate().
486 * \li The socket must have a valid descriptor.
488 * \li There must be no other reference to this socket.
490 * \li There must be no pending I/O requests.
492 * \li 'sock->type' is not isc_sockettype_fdwatch
495 * \li #ISC_R_NOTIMPLEMENTED
499 isc_socket_bind(isc_socket_t *sock, isc_sockaddr_t *addressp,
500 unsigned int options);
502 * Bind 'socket' to '*addressp'.
506 * \li 'socket' is a valid socket
508 * \li 'addressp' points to a valid isc_sockaddr.
514 * \li ISC_R_ADDRNOTAVAIL
515 * \li ISC_R_ADDRINUSE
517 * \li ISC_R_UNEXPECTED
521 isc_socket_filter(isc_socket_t *sock, const char *filter);
523 * Inform the kernel that it should perform accept filtering.
524 * If filter is NULL the current filter will be removed.:w
528 isc_socket_listen(isc_socket_t *sock, unsigned int backlog);
530 * Set listen mode on the socket. After this call, the only function that
531 * can be used (other than attach and detach) is isc_socket_accept().
535 * \li 'backlog' is as in the UNIX system call listen() and may be
536 * ignored by non-UNIX implementations.
538 * \li If 'backlog' is zero, a reasonable system default is used, usually
543 * \li 'socket' is a valid, bound TCP socket or a valid, bound UNIX socket.
548 * \li ISC_R_UNEXPECTED
552 isc_socket_accept(isc_socket_t *sock,
553 isc_task_t *task, isc_taskaction_t action, const void *arg);
555 * Queue accept event. When a new connection is received, the task will
556 * get an ISC_SOCKEVENT_NEWCONN event with the sender set to the listen
557 * socket. The new socket structure is sent inside the isc_socket_newconnev_t
558 * event type, and is attached to the task 'task'.
561 * \li 'socket' is a valid TCP socket that isc_socket_listen() was called
564 * \li 'task' is a valid task
566 * \li 'action' is a valid action
571 * \li ISC_R_UNEXPECTED
575 isc_socket_connect(isc_socket_t *sock, isc_sockaddr_t *addressp,
576 isc_task_t *task, isc_taskaction_t action,
579 * Connect 'socket' to peer with address *saddr. When the connection
580 * succeeds, or when an error occurs, a CONNECT event with action 'action'
581 * and arg 'arg' will be posted to the event queue for 'task'.
585 * \li 'socket' is a valid TCP socket
587 * \li 'addressp' points to a valid isc_sockaddr
589 * \li 'task' is a valid task
591 * \li 'action' is a valid action
597 * \li ISC_R_UNEXPECTED
599 * Posted event's result code:
603 * \li ISC_R_CONNREFUSED
604 * \li ISC_R_NETUNREACH
605 * \li ISC_R_UNEXPECTED
609 isc_socket_getpeername(isc_socket_t *sock, isc_sockaddr_t *addressp);
611 * Get the name of the peer connected to 'socket'.
615 * \li 'socket' is a valid TCP socket.
621 * \li ISC_R_UNEXPECTED
625 isc_socket_getsockname(isc_socket_t *sock, isc_sockaddr_t *addressp);
627 * Get the name of 'socket'.
631 * \li 'socket' is a valid socket.
637 * \li ISC_R_UNEXPECTED
642 isc_socket_recv(isc_socket_t *sock, isc_region_t *region,
643 unsigned int minimum,
644 isc_task_t *task, isc_taskaction_t action, const void *arg);
646 isc_socket_recvv(isc_socket_t *sock, isc_bufferlist_t *buflist,
647 unsigned int minimum,
648 isc_task_t *task, isc_taskaction_t action, const void *arg);
651 isc_socket_recv2(isc_socket_t *sock, isc_region_t *region,
652 unsigned int minimum, isc_task_t *task,
653 isc_socketevent_t *event, unsigned int flags);
656 * Receive from 'socket', storing the results in region.
660 *\li Let 'length' refer to the length of 'region' or to the sum of all
661 * available regions in the list of buffers '*buflist'.
663 *\li If 'minimum' is non-zero and at least that many bytes are read,
664 * the completion event will be posted to the task 'task.' If minimum
665 * is zero, the exact number of bytes requested in the region must
666 * be read for an event to be posted. This only makes sense for TCP
667 * connections, and is always set to 1 byte for UDP.
669 *\li The read will complete when the desired number of bytes have been
670 * read, if end-of-input occurs, or if an error occurs. A read done
671 * event with the given 'action' and 'arg' will be posted to the
672 * event queue of 'task'.
674 *\li The caller may not modify 'region', the buffers which are passed
675 * into this function, or any data they refer to until the completion
678 *\li For isc_socket_recvv():
679 * On successful completion, '*buflist' will be empty, and the list of
680 * all buffers will be returned in the done event's 'bufferlist'
681 * member. On error return, '*buflist' will be unchanged.
683 *\li For isc_socket_recv2():
684 * 'event' is not NULL, and the non-socket specific fields are
685 * expected to be initialized.
687 *\li For isc_socket_recv2():
688 * The only defined value for 'flags' is ISC_SOCKFLAG_IMMEDIATE. If
689 * set and the operation completes, the return value will be
690 * ISC_R_SUCCESS and the event will be filled in and not sent. If the
691 * operation does not complete, the return value will be
692 * ISC_R_INPROGRESS and the event will be sent when the operation
697 *\li 'socket' is a valid, bound socket.
699 *\li For isc_socket_recv():
700 * 'region' is a valid region
702 *\li For isc_socket_recvv():
703 * 'buflist' is non-NULL, and '*buflist' contain at least one buffer.
705 *\li 'task' is a valid task
707 *\li For isc_socket_recv() and isc_socket_recvv():
708 * action != NULL and is a valid action
710 *\li For isc_socket_recv2():
716 *\li #ISC_R_INPROGRESS
718 *\li #ISC_R_UNEXPECTED
723 *\li #ISC_R_UNEXPECTED
724 *\li XXX needs other net-type errors
730 isc_socket_send(isc_socket_t *sock, isc_region_t *region,
731 isc_task_t *task, isc_taskaction_t action, const void *arg);
733 isc_socket_sendto(isc_socket_t *sock, isc_region_t *region,
734 isc_task_t *task, isc_taskaction_t action, const void *arg,
735 isc_sockaddr_t *address, struct in6_pktinfo *pktinfo);
737 isc_socket_sendv(isc_socket_t *sock, isc_bufferlist_t *buflist,
738 isc_task_t *task, isc_taskaction_t action, const void *arg);
740 isc_socket_sendtov(isc_socket_t *sock, isc_bufferlist_t *buflist,
741 isc_task_t *task, isc_taskaction_t action, const void *arg,
742 isc_sockaddr_t *address, struct in6_pktinfo *pktinfo);
744 isc_socket_sendto2(isc_socket_t *sock, isc_region_t *region,
746 isc_sockaddr_t *address, struct in6_pktinfo *pktinfo,
747 isc_socketevent_t *event, unsigned int flags);
750 * Send the contents of 'region' to the socket's peer.
754 *\li Shutting down the requestor's task *may* result in any
755 * still pending writes being dropped or completed, depending on the
756 * underlying OS implementation.
758 *\li If 'action' is NULL, then no completion event will be posted.
760 *\li The caller may not modify 'region', the buffers which are passed
761 * into this function, or any data they refer to until the completion
764 *\li For isc_socket_sendv() and isc_socket_sendtov():
765 * On successful completion, '*buflist' will be empty, and the list of
766 * all buffers will be returned in the done event's 'bufferlist'
767 * member. On error return, '*buflist' will be unchanged.
769 *\li For isc_socket_sendto2():
770 * 'event' is not NULL, and the non-socket specific fields are
771 * expected to be initialized.
773 *\li For isc_socket_sendto2():
774 * The only defined values for 'flags' are ISC_SOCKFLAG_IMMEDIATE
775 * and ISC_SOCKFLAG_NORETRY.
777 *\li If ISC_SOCKFLAG_IMMEDIATE is set and the operation completes, the
778 * return value will be ISC_R_SUCCESS and the event will be filled
779 * in and not sent. If the operation does not complete, the return
780 * value will be ISC_R_INPROGRESS and the event will be sent when
781 * the operation completes.
783 *\li ISC_SOCKFLAG_NORETRY can only be set for UDP sockets. If set
784 * and the send operation fails due to a transient error, the send
785 * will not be retried and the error will be indicated in the event.
786 * Using this option along with ISC_SOCKFLAG_IMMEDIATE allows the caller
787 * to specify a region that is allocated on the stack.
791 *\li 'socket' is a valid, bound socket.
793 *\li For isc_socket_send():
794 * 'region' is a valid region
796 *\li For isc_socket_sendv() and isc_socket_sendtov():
797 * 'buflist' is non-NULL, and '*buflist' contain at least one buffer.
799 *\li 'task' is a valid task
801 *\li For isc_socket_sendv(), isc_socket_sendtov(), isc_socket_send(), and
802 * isc_socket_sendto():
803 * action == NULL or is a valid action
805 *\li For isc_socket_sendto2():
811 *\li #ISC_R_INPROGRESS
813 *\li #ISC_R_UNEXPECTED
818 *\li #ISC_R_UNEXPECTED
819 *\li XXX needs other net-type errors
824 isc_socketmgr_create(isc_mem_t *mctx, isc_socketmgr_t **managerp);
827 isc_socketmgr_create2(isc_mem_t *mctx, isc_socketmgr_t **managerp,
828 unsigned int maxsocks);
830 * Create a socket manager. If "maxsocks" is non-zero, it specifies the
831 * maximum number of sockets that the created manager should handle.
832 * isc_socketmgr_create() is equivalent of isc_socketmgr_create2() with
833 * "maxsocks" being zero.
837 *\li All memory will be allocated in memory context 'mctx'.
841 *\li 'mctx' is a valid memory context.
843 *\li 'managerp' points to a NULL isc_socketmgr_t.
847 *\li '*managerp' is a valid isc_socketmgr_t.
853 *\li #ISC_R_UNEXPECTED
854 *\li #ISC_R_NOTIMPLEMENTED
858 isc_socketmgr_getmaxsockets(isc_socketmgr_t *manager, unsigned int *nsockp);
860 * Returns in "*nsockp" the maximum number of sockets this manager may open.
864 *\li '*manager' is a valid isc_socketmgr_t.
865 *\li 'nsockp' is not NULL.
870 *\li #ISC_R_NOTIMPLEMENTED
874 isc_socketmgr_setstats(isc_socketmgr_t *manager, isc_stats_t *stats);
876 * Set a general socket statistics counter set 'stats' for 'manager'.
879 * \li 'manager' is valid, hasn't opened any socket, and doesn't have
882 *\li stats is a valid statistics supporting socket statistics counters
887 isc_socketmgr_destroy(isc_socketmgr_t **managerp);
889 * Destroy a socket manager.
893 *\li This routine blocks until there are no sockets left in the manager,
894 * so if the caller holds any socket references using the manager, it
895 * must detach them before calling isc_socketmgr_destroy() or it will
900 *\li '*managerp' is a valid isc_socketmgr_t.
902 *\li All sockets managed by this manager are fully detached.
906 *\li *managerp == NULL
908 *\li All resources used by the manager have been freed.
912 isc_socket_gettype(isc_socket_t *sock);
914 * Returns the socket type for "sock."
918 *\li "sock" is a valid socket.
923 isc_socket_isbound(isc_socket_t *sock);
926 isc_socket_ipv6only(isc_socket_t *sock, isc_boolean_t yes);
928 * If the socket is an IPv6 socket set/clear the IPV6_IPV6ONLY socket
929 * option if the host OS supports this option.
932 *\li 'sock' is a valid socket.
937 isc_socket_cleanunix(isc_sockaddr_t *addr, isc_boolean_t active);
940 * Cleanup UNIX domain sockets in the file-system. If 'active' is true
941 * then just unlink the socket. If 'active' is false try to determine
942 * if there is a listener of the socket or not. If no listener is found
943 * then unlink socket.
945 * Prior to unlinking the path is tested to see if it a socket.
947 * Note: there are a number of race conditions which cannot be avoided
948 * both in the filesystem and any application using UNIX domain
949 * sockets (e.g. socket is tested between bind() and listen(),
950 * the socket is deleted and replaced in the file-system between
951 * stat() and unlink()).
955 isc_socket_permunix(isc_sockaddr_t *sockaddr, isc_uint32_t perm,
956 isc_uint32_t owner, isc_uint32_t group);
958 * Set ownership and file permissions on the UNIX domain socket.
960 * Note: On Solaris and SunOS this secures the directory containing
961 * the socket as Solaris and SunOS do not honour the filesystem
962 * permissions on the socket.
965 * \li 'sockaddr' to be a valid UNIX domain sockaddr.
972 void isc_socket_setname(isc_socket_t *socket, const char *name, void *tag);
974 * Set the name and optional tag for a socket. This allows tracking of the
975 * owner or purpose for this socket, and is useful for tracing and statistics
979 const char *isc_socket_getname(isc_socket_t *socket);
981 * Get the name associated with a socket, if any.
984 void *isc_socket_gettag(isc_socket_t *socket);
986 * Get the tag associated with a socket, if any.
990 isc__socketmgr_setreserved(isc_socketmgr_t *mgr, isc_uint32_t);
992 * Temporary. For use by named only.
998 isc_socketmgr_renderxml(isc_socketmgr_t *mgr, xmlTextWriterPtr writer);
1000 * Render internal statistics and other state into the XML document.
1003 #endif /* HAVE_LIBXML2 */
1007 #endif /* ISC_SOCKET_H */