source: UsbWattMeter/trunk/curl-7.47.1/include/curl/multi.h@ 164

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1#ifndef __CURL_MULTI_H
2#define __CURL_MULTI_H
3/***************************************************************************
4 * _ _ ____ _
5 * Project ___| | | | _ \| |
6 * / __| | | | |_) | |
7 * | (__| |_| | _ <| |___
8 * \___|\___/|_| \_\_____|
9 *
10 * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
11 *
12 * This software is licensed as described in the file COPYING, which
13 * you should have received as part of this distribution. The terms
14 * are also available at https://curl.haxx.se/docs/copyright.html.
15 *
16 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
17 * copies of the Software, and permit persons to whom the Software is
18 * furnished to do so, under the terms of the COPYING file.
19 *
20 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
21 * KIND, either express or implied.
22 *
23 ***************************************************************************/
24/*
25 This is an "external" header file. Don't give away any internals here!
26
27 GOALS
28
29 o Enable a "pull" interface. The application that uses libcurl decides where
30 and when to ask libcurl to get/send data.
31
32 o Enable multiple simultaneous transfers in the same thread without making it
33 complicated for the application.
34
35 o Enable the application to select() on its own file descriptors and curl's
36 file descriptors simultaneous easily.
37
38*/
39
40/*
41 * This header file should not really need to include "curl.h" since curl.h
42 * itself includes this file and we expect user applications to do #include
43 * <curl/curl.h> without the need for especially including multi.h.
44 *
45 * For some reason we added this include here at one point, and rather than to
46 * break existing (wrongly written) libcurl applications, we leave it as-is
47 * but with this warning attached.
48 */
49#include "curl.h"
50
51#ifdef __cplusplus
52extern "C" {
53#endif
54
55typedef void CURLM;
56
57typedef enum {
58 CURLM_CALL_MULTI_PERFORM = -1, /* please call curl_multi_perform() or
59 curl_multi_socket*() soon */
60 CURLM_OK,
61 CURLM_BAD_HANDLE, /* the passed-in handle is not a valid CURLM handle */
62 CURLM_BAD_EASY_HANDLE, /* an easy handle was not good/valid */
63 CURLM_OUT_OF_MEMORY, /* if you ever get this, you're in deep sh*t */
64 CURLM_INTERNAL_ERROR, /* this is a libcurl bug */
65 CURLM_BAD_SOCKET, /* the passed in socket argument did not match */
66 CURLM_UNKNOWN_OPTION, /* curl_multi_setopt() with unsupported option */
67 CURLM_ADDED_ALREADY, /* an easy handle already added to a multi handle was
68 attempted to get added - again */
69 CURLM_LAST
70} CURLMcode;
71
72/* just to make code nicer when using curl_multi_socket() you can now check
73 for CURLM_CALL_MULTI_SOCKET too in the same style it works for
74 curl_multi_perform() and CURLM_CALL_MULTI_PERFORM */
75#define CURLM_CALL_MULTI_SOCKET CURLM_CALL_MULTI_PERFORM
76
77/* bitmask bits for CURLMOPT_PIPELINING */
78#define CURLPIPE_NOTHING 0L
79#define CURLPIPE_HTTP1 1L
80#define CURLPIPE_MULTIPLEX 2L
81
82typedef enum {
83 CURLMSG_NONE, /* first, not used */
84 CURLMSG_DONE, /* This easy handle has completed. 'result' contains
85 the CURLcode of the transfer */
86 CURLMSG_LAST /* last, not used */
87} CURLMSG;
88
89struct CURLMsg {
90 CURLMSG msg; /* what this message means */
91 CURL *easy_handle; /* the handle it concerns */
92 union {
93 void *whatever; /* message-specific data */
94 CURLcode result; /* return code for transfer */
95 } data;
96};
97typedef struct CURLMsg CURLMsg;
98
99/* Based on poll(2) structure and values.
100 * We don't use pollfd and POLL* constants explicitly
101 * to cover platforms without poll(). */
102#define CURL_WAIT_POLLIN 0x0001
103#define CURL_WAIT_POLLPRI 0x0002
104#define CURL_WAIT_POLLOUT 0x0004
105
106struct curl_waitfd {
107 curl_socket_t fd;
108 short events;
109 short revents; /* not supported yet */
110};
111
112/*
113 * Name: curl_multi_init()
114 *
115 * Desc: inititalize multi-style curl usage
116 *
117 * Returns: a new CURLM handle to use in all 'curl_multi' functions.
118 */
119CURL_EXTERN CURLM *curl_multi_init(void);
120
121/*
122 * Name: curl_multi_add_handle()
123 *
124 * Desc: add a standard curl handle to the multi stack
125 *
126 * Returns: CURLMcode type, general multi error code.
127 */
128CURL_EXTERN CURLMcode curl_multi_add_handle(CURLM *multi_handle,
129 CURL *curl_handle);
130
131 /*
132 * Name: curl_multi_remove_handle()
133 *
134 * Desc: removes a curl handle from the multi stack again
135 *
136 * Returns: CURLMcode type, general multi error code.
137 */
138CURL_EXTERN CURLMcode curl_multi_remove_handle(CURLM *multi_handle,
139 CURL *curl_handle);
140
141 /*
142 * Name: curl_multi_fdset()
143 *
144 * Desc: Ask curl for its fd_set sets. The app can use these to select() or
145 * poll() on. We want curl_multi_perform() called as soon as one of
146 * them are ready.
147 *
148 * Returns: CURLMcode type, general multi error code.
149 */
150CURL_EXTERN CURLMcode curl_multi_fdset(CURLM *multi_handle,
151 fd_set *read_fd_set,
152 fd_set *write_fd_set,
153 fd_set *exc_fd_set,
154 int *max_fd);
155
156/*
157 * Name: curl_multi_wait()
158 *
159 * Desc: Poll on all fds within a CURLM set as well as any
160 * additional fds passed to the function.
161 *
162 * Returns: CURLMcode type, general multi error code.
163 */
164CURL_EXTERN CURLMcode curl_multi_wait(CURLM *multi_handle,
165 struct curl_waitfd extra_fds[],
166 unsigned int extra_nfds,
167 int timeout_ms,
168 int *ret);
169
170 /*
171 * Name: curl_multi_perform()
172 *
173 * Desc: When the app thinks there's data available for curl it calls this
174 * function to read/write whatever there is right now. This returns
175 * as soon as the reads and writes are done. This function does not
176 * require that there actually is data available for reading or that
177 * data can be written, it can be called just in case. It returns
178 * the number of handles that still transfer data in the second
179 * argument's integer-pointer.
180 *
181 * Returns: CURLMcode type, general multi error code. *NOTE* that this only
182 * returns errors etc regarding the whole multi stack. There might
183 * still have occurred problems on invidual transfers even when this
184 * returns OK.
185 */
186CURL_EXTERN CURLMcode curl_multi_perform(CURLM *multi_handle,
187 int *running_handles);
188
189 /*
190 * Name: curl_multi_cleanup()
191 *
192 * Desc: Cleans up and removes a whole multi stack. It does not free or
193 * touch any individual easy handles in any way. We need to define
194 * in what state those handles will be if this function is called
195 * in the middle of a transfer.
196 *
197 * Returns: CURLMcode type, general multi error code.
198 */
199CURL_EXTERN CURLMcode curl_multi_cleanup(CURLM *multi_handle);
200
201/*
202 * Name: curl_multi_info_read()
203 *
204 * Desc: Ask the multi handle if there's any messages/informationals from
205 * the individual transfers. Messages include informationals such as
206 * error code from the transfer or just the fact that a transfer is
207 * completed. More details on these should be written down as well.
208 *
209 * Repeated calls to this function will return a new struct each
210 * time, until a special "end of msgs" struct is returned as a signal
211 * that there is no more to get at this point.
212 *
213 * The data the returned pointer points to will not survive calling
214 * curl_multi_cleanup().
215 *
216 * The 'CURLMsg' struct is meant to be very simple and only contain
217 * very basic informations. If more involved information is wanted,
218 * we will provide the particular "transfer handle" in that struct
219 * and that should/could/would be used in subsequent
220 * curl_easy_getinfo() calls (or similar). The point being that we
221 * must never expose complex structs to applications, as then we'll
222 * undoubtably get backwards compatibility problems in the future.
223 *
224 * Returns: A pointer to a filled-in struct, or NULL if it failed or ran out
225 * of structs. It also writes the number of messages left in the
226 * queue (after this read) in the integer the second argument points
227 * to.
228 */
229CURL_EXTERN CURLMsg *curl_multi_info_read(CURLM *multi_handle,
230 int *msgs_in_queue);
231
232/*
233 * Name: curl_multi_strerror()
234 *
235 * Desc: The curl_multi_strerror function may be used to turn a CURLMcode
236 * value into the equivalent human readable error string. This is
237 * useful for printing meaningful error messages.
238 *
239 * Returns: A pointer to a zero-terminated error message.
240 */
241CURL_EXTERN const char *curl_multi_strerror(CURLMcode);
242
243/*
244 * Name: curl_multi_socket() and
245 * curl_multi_socket_all()
246 *
247 * Desc: An alternative version of curl_multi_perform() that allows the
248 * application to pass in one of the file descriptors that have been
249 * detected to have "action" on them and let libcurl perform.
250 * See man page for details.
251 */
252#define CURL_POLL_NONE 0
253#define CURL_POLL_IN 1
254#define CURL_POLL_OUT 2
255#define CURL_POLL_INOUT 3
256#define CURL_POLL_REMOVE 4
257
258#define CURL_SOCKET_TIMEOUT CURL_SOCKET_BAD
259
260#define CURL_CSELECT_IN 0x01
261#define CURL_CSELECT_OUT 0x02
262#define CURL_CSELECT_ERR 0x04
263
264typedef int (*curl_socket_callback)(CURL *easy, /* easy handle */
265 curl_socket_t s, /* socket */
266 int what, /* see above */
267 void *userp, /* private callback
268 pointer */
269 void *socketp); /* private socket
270 pointer */
271/*
272 * Name: curl_multi_timer_callback
273 *
274 * Desc: Called by libcurl whenever the library detects a change in the
275 * maximum number of milliseconds the app is allowed to wait before
276 * curl_multi_socket() or curl_multi_perform() must be called
277 * (to allow libcurl's timed events to take place).
278 *
279 * Returns: The callback should return zero.
280 */
281typedef int (*curl_multi_timer_callback)(CURLM *multi, /* multi handle */
282 long timeout_ms, /* see above */
283 void *userp); /* private callback
284 pointer */
285
286CURL_EXTERN CURLMcode curl_multi_socket(CURLM *multi_handle, curl_socket_t s,
287 int *running_handles);
288
289CURL_EXTERN CURLMcode curl_multi_socket_action(CURLM *multi_handle,
290 curl_socket_t s,
291 int ev_bitmask,
292 int *running_handles);
293
294CURL_EXTERN CURLMcode curl_multi_socket_all(CURLM *multi_handle,
295 int *running_handles);
296
297#ifndef CURL_ALLOW_OLD_MULTI_SOCKET
298/* This macro below was added in 7.16.3 to push users who recompile to use
299 the new curl_multi_socket_action() instead of the old curl_multi_socket()
300*/
301#define curl_multi_socket(x,y,z) curl_multi_socket_action(x,y,0,z)
302#endif
303
304/*
305 * Name: curl_multi_timeout()
306 *
307 * Desc: Returns the maximum number of milliseconds the app is allowed to
308 * wait before curl_multi_socket() or curl_multi_perform() must be
309 * called (to allow libcurl's timed events to take place).
310 *
311 * Returns: CURLM error code.
312 */
313CURL_EXTERN CURLMcode curl_multi_timeout(CURLM *multi_handle,
314 long *milliseconds);
315
316#undef CINIT /* re-using the same name as in curl.h */
317
318#ifdef CURL_ISOCPP
319#define CINIT(name,type,num) CURLMOPT_ ## name = CURLOPTTYPE_ ## type + num
320#else
321/* The macro "##" is ISO C, we assume pre-ISO C doesn't support it. */
322#define LONG CURLOPTTYPE_LONG
323#define OBJECTPOINT CURLOPTTYPE_OBJECTPOINT
324#define FUNCTIONPOINT CURLOPTTYPE_FUNCTIONPOINT
325#define OFF_T CURLOPTTYPE_OFF_T
326#define CINIT(name,type,number) CURLMOPT_/**/name = type + number
327#endif
328
329typedef enum {
330 /* This is the socket callback function pointer */
331 CINIT(SOCKETFUNCTION, FUNCTIONPOINT, 1),
332
333 /* This is the argument passed to the socket callback */
334 CINIT(SOCKETDATA, OBJECTPOINT, 2),
335
336 /* set to 1 to enable pipelining for this multi handle */
337 CINIT(PIPELINING, LONG, 3),
338
339 /* This is the timer callback function pointer */
340 CINIT(TIMERFUNCTION, FUNCTIONPOINT, 4),
341
342 /* This is the argument passed to the timer callback */
343 CINIT(TIMERDATA, OBJECTPOINT, 5),
344
345 /* maximum number of entries in the connection cache */
346 CINIT(MAXCONNECTS, LONG, 6),
347
348 /* maximum number of (pipelining) connections to one host */
349 CINIT(MAX_HOST_CONNECTIONS, LONG, 7),
350
351 /* maximum number of requests in a pipeline */
352 CINIT(MAX_PIPELINE_LENGTH, LONG, 8),
353
354 /* a connection with a content-length longer than this
355 will not be considered for pipelining */
356 CINIT(CONTENT_LENGTH_PENALTY_SIZE, OFF_T, 9),
357
358 /* a connection with a chunk length longer than this
359 will not be considered for pipelining */
360 CINIT(CHUNK_LENGTH_PENALTY_SIZE, OFF_T, 10),
361
362 /* a list of site names(+port) that are blacklisted from
363 pipelining */
364 CINIT(PIPELINING_SITE_BL, OBJECTPOINT, 11),
365
366 /* a list of server types that are blacklisted from
367 pipelining */
368 CINIT(PIPELINING_SERVER_BL, OBJECTPOINT, 12),
369
370 /* maximum number of open connections in total */
371 CINIT(MAX_TOTAL_CONNECTIONS, LONG, 13),
372
373 /* This is the server push callback function pointer */
374 CINIT(PUSHFUNCTION, FUNCTIONPOINT, 14),
375
376 /* This is the argument passed to the server push callback */
377 CINIT(PUSHDATA, OBJECTPOINT, 15),
378
379 CURLMOPT_LASTENTRY /* the last unused */
380} CURLMoption;
381
382
383/*
384 * Name: curl_multi_setopt()
385 *
386 * Desc: Sets options for the multi handle.
387 *
388 * Returns: CURLM error code.
389 */
390CURL_EXTERN CURLMcode curl_multi_setopt(CURLM *multi_handle,
391 CURLMoption option, ...);
392
393
394/*
395 * Name: curl_multi_assign()
396 *
397 * Desc: This function sets an association in the multi handle between the
398 * given socket and a private pointer of the application. This is
399 * (only) useful for curl_multi_socket uses.
400 *
401 * Returns: CURLM error code.
402 */
403CURL_EXTERN CURLMcode curl_multi_assign(CURLM *multi_handle,
404 curl_socket_t sockfd, void *sockp);
405
406
407/*
408 * Name: curl_push_callback
409 *
410 * Desc: This callback gets called when a new stream is being pushed by the
411 * server. It approves or denies the new stream.
412 *
413 * Returns: CURL_PUSH_OK or CURL_PUSH_DENY.
414 */
415#define CURL_PUSH_OK 0
416#define CURL_PUSH_DENY 1
417
418struct curl_pushheaders; /* forward declaration only */
419
420CURL_EXTERN char *curl_pushheader_bynum(struct curl_pushheaders *h,
421 size_t num);
422CURL_EXTERN char *curl_pushheader_byname(struct curl_pushheaders *h,
423 const char *name);
424
425typedef int (*curl_push_callback)(CURL *parent,
426 CURL *easy,
427 size_t num_headers,
428 struct curl_pushheaders *headers,
429 void *userp);
430
431#ifdef __cplusplus
432} /* end of extern "C" */
433#endif
434
435#endif
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