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+#ifndef CURLINC_MULTI_H
+#define CURLINC_MULTI_H
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+/*
+ This is an "external" header file. Don't give away any internals here!
+
+ GOALS
+
+ o Enable a "pull" interface. The application that uses libcurl decides where
+ and when to ask libcurl to get/send data.
+
+ o Enable multiple simultaneous transfers in the same thread without making it
+ complicated for the application.
+
+ o Enable the application to select() on its own file descriptors and curl's
+ file descriptors simultaneous easily.
+
+*/
+
+/*
+ * This header file should not really need to include "curl.h" since curl.h
+ * itself includes this file and we expect user applications to do #include
+ * <curl/curl.h> without the need for especially including multi.h.
+ *
+ * For some reason we added this include here at one point, and rather than to
+ * break existing (wrongly written) libcurl applications, we leave it as-is
+ * but with this warning attached.
+ */
+#include "curl.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(BUILDING_LIBCURL) || defined(CURL_STRICTER)
+typedef struct Curl_multi CURLM;
+#else
+typedef void CURLM;
+#endif
+
+typedef enum {
+ CURLM_CALL_MULTI_PERFORM = -1, /* please call curl_multi_perform() or
+ curl_multi_socket*() soon */
+ CURLM_OK,
+ CURLM_BAD_HANDLE, /* the passed-in handle is not a valid CURLM handle */
+ CURLM_BAD_EASY_HANDLE, /* an easy handle was not good/valid */
+ CURLM_OUT_OF_MEMORY, /* if you ever get this, you're in deep sh*t */
+ CURLM_INTERNAL_ERROR, /* this is a libcurl bug */
+ CURLM_BAD_SOCKET, /* the passed in socket argument did not match */
+ CURLM_UNKNOWN_OPTION, /* curl_multi_setopt() with unsupported option */
+ CURLM_ADDED_ALREADY, /* an easy handle already added to a multi handle was
+ attempted to get added - again */
+ CURLM_RECURSIVE_API_CALL, /* an api function was called from inside a
+ callback */
+ CURLM_WAKEUP_FAILURE, /* wakeup is unavailable or failed */
+ CURLM_BAD_FUNCTION_ARGUMENT, /* function called with a bad parameter */
+ CURLM_ABORTED_BY_CALLBACK,
+ CURLM_LAST
+} CURLMcode;
+
+/* just to make code nicer when using curl_multi_socket() you can now check
+ for CURLM_CALL_MULTI_SOCKET too in the same style it works for
+ curl_multi_perform() and CURLM_CALL_MULTI_PERFORM */
+#define CURLM_CALL_MULTI_SOCKET CURLM_CALL_MULTI_PERFORM
+
+/* bitmask bits for CURLMOPT_PIPELINING */
+#define CURLPIPE_NOTHING 0L
+#define CURLPIPE_HTTP1 1L
+#define CURLPIPE_MULTIPLEX 2L
+
+typedef enum {
+ CURLMSG_NONE, /* first, not used */
+ CURLMSG_DONE, /* This easy handle has completed. 'result' contains
+ the CURLcode of the transfer */
+ CURLMSG_LAST /* last, not used */
+} CURLMSG;
+
+struct CURLMsg {
+ CURLMSG msg; /* what this message means */
+ CURL *easy_handle; /* the handle it concerns */
+ union {
+ void *whatever; /* message-specific data */
+ CURLcode result; /* return code for transfer */
+ } data;
+};
+typedef struct CURLMsg CURLMsg;
+
+/* Based on poll(2) structure and values.
+ * We don't use pollfd and POLL* constants explicitly
+ * to cover platforms without poll(). */
+#define CURL_WAIT_POLLIN 0x0001
+#define CURL_WAIT_POLLPRI 0x0002
+#define CURL_WAIT_POLLOUT 0x0004
+
+struct curl_waitfd {
+ curl_socket_t fd;
+ short events;
+ short revents; /* not supported yet */
+};
+
+/*
+ * Name: curl_multi_init()
+ *
+ * Desc: inititalize multi-style curl usage
+ *
+ * Returns: a new CURLM handle to use in all 'curl_multi' functions.
+ */
+CURL_EXTERN CURLM *curl_multi_init(void);
+
+/*
+ * Name: curl_multi_add_handle()
+ *
+ * Desc: add a standard curl handle to the multi stack
+ *
+ * Returns: CURLMcode type, general multi error code.
+ */
+CURL_EXTERN CURLMcode curl_multi_add_handle(CURLM *multi_handle,
+ CURL *curl_handle);
+
+ /*
+ * Name: curl_multi_remove_handle()
+ *
+ * Desc: removes a curl handle from the multi stack again
+ *
+ * Returns: CURLMcode type, general multi error code.
+ */
+CURL_EXTERN CURLMcode curl_multi_remove_handle(CURLM *multi_handle,
+ CURL *curl_handle);
+
+ /*
+ * Name: curl_multi_fdset()
+ *
+ * Desc: Ask curl for its fd_set sets. The app can use these to select() or
+ * poll() on. We want curl_multi_perform() called as soon as one of
+ * them are ready.
+ *
+ * Returns: CURLMcode type, general multi error code.
+ */
+CURL_EXTERN CURLMcode curl_multi_fdset(CURLM *multi_handle,
+ fd_set *read_fd_set,
+ fd_set *write_fd_set,
+ fd_set *exc_fd_set,
+ int *max_fd);
+
+/*
+ * Name: curl_multi_wait()
+ *
+ * Desc: Poll on all fds within a CURLM set as well as any
+ * additional fds passed to the function.
+ *
+ * Returns: CURLMcode type, general multi error code.
+ */
+CURL_EXTERN CURLMcode curl_multi_wait(CURLM *multi_handle,
+ struct curl_waitfd extra_fds[],
+ unsigned int extra_nfds,
+ int timeout_ms,
+ int *ret);
+
+/*
+ * Name: curl_multi_poll()
+ *
+ * Desc: Poll on all fds within a CURLM set as well as any
+ * additional fds passed to the function.
+ *
+ * Returns: CURLMcode type, general multi error code.
+ */
+CURL_EXTERN CURLMcode curl_multi_poll(CURLM *multi_handle,
+ struct curl_waitfd extra_fds[],
+ unsigned int extra_nfds,
+ int timeout_ms,
+ int *ret);
+
+/*
+ * Name: curl_multi_wakeup()
+ *
+ * Desc: wakes up a sleeping curl_multi_poll call.
+ *
+ * Returns: CURLMcode type, general multi error code.
+ */
+CURL_EXTERN CURLMcode curl_multi_wakeup(CURLM *multi_handle);
+
+ /*
+ * Name: curl_multi_perform()
+ *
+ * Desc: When the app thinks there's data available for curl it calls this
+ * function to read/write whatever there is right now. This returns
+ * as soon as the reads and writes are done. This function does not
+ * require that there actually is data available for reading or that
+ * data can be written, it can be called just in case. It returns
+ * the number of handles that still transfer data in the second
+ * argument's integer-pointer.
+ *
+ * Returns: CURLMcode type, general multi error code. *NOTE* that this only
+ * returns errors etc regarding the whole multi stack. There might
+ * still have occurred problems on individual transfers even when
+ * this returns OK.
+ */
+CURL_EXTERN CURLMcode curl_multi_perform(CURLM *multi_handle,
+ int *running_handles);
+
+ /*
+ * Name: curl_multi_cleanup()
+ *
+ * Desc: Cleans up and removes a whole multi stack. It does not free or
+ * touch any individual easy handles in any way. We need to define
+ * in what state those handles will be if this function is called
+ * in the middle of a transfer.
+ *
+ * Returns: CURLMcode type, general multi error code.
+ */
+CURL_EXTERN CURLMcode curl_multi_cleanup(CURLM *multi_handle);
+
+/*
+ * Name: curl_multi_info_read()
+ *
+ * Desc: Ask the multi handle if there's any messages/informationals from
+ * the individual transfers. Messages include informationals such as
+ * error code from the transfer or just the fact that a transfer is
+ * completed. More details on these should be written down as well.
+ *
+ * Repeated calls to this function will return a new struct each
+ * time, until a special "end of msgs" struct is returned as a signal
+ * that there is no more to get at this point.
+ *
+ * The data the returned pointer points to will not survive calling
+ * curl_multi_cleanup().
+ *
+ * The 'CURLMsg' struct is meant to be very simple and only contain
+ * very basic information. If more involved information is wanted,
+ * we will provide the particular "transfer handle" in that struct
+ * and that should/could/would be used in subsequent
+ * curl_easy_getinfo() calls (or similar). The point being that we
+ * must never expose complex structs to applications, as then we'll
+ * undoubtably get backwards compatibility problems in the future.
+ *
+ * Returns: A pointer to a filled-in struct, or NULL if it failed or ran out
+ * of structs. It also writes the number of messages left in the
+ * queue (after this read) in the integer the second argument points
+ * to.
+ */
+CURL_EXTERN CURLMsg *curl_multi_info_read(CURLM *multi_handle,
+ int *msgs_in_queue);
+
+/*
+ * Name: curl_multi_strerror()
+ *
+ * Desc: The curl_multi_strerror function may be used to turn a CURLMcode
+ * value into the equivalent human readable error string. This is
+ * useful for printing meaningful error messages.
+ *
+ * Returns: A pointer to a null-terminated error message.
+ */
+CURL_EXTERN const char *curl_multi_strerror(CURLMcode);
+
+/*
+ * Name: curl_multi_socket() and
+ * curl_multi_socket_all()
+ *
+ * Desc: An alternative version of curl_multi_perform() that allows the
+ * application to pass in one of the file descriptors that have been
+ * detected to have "action" on them and let libcurl perform.
+ * See man page for details.
+ */
+#define CURL_POLL_NONE 0
+#define CURL_POLL_IN 1
+#define CURL_POLL_OUT 2
+#define CURL_POLL_INOUT 3
+#define CURL_POLL_REMOVE 4
+
+#define CURL_SOCKET_TIMEOUT CURL_SOCKET_BAD
+
+#define CURL_CSELECT_IN 0x01
+#define CURL_CSELECT_OUT 0x02
+#define CURL_CSELECT_ERR 0x04
+
+typedef int (*curl_socket_callback)(CURL *easy, /* easy handle */
+ curl_socket_t s, /* socket */
+ int what, /* see above */
+ void *userp, /* private callback
+ pointer */
+ void *socketp); /* private socket
+ pointer */
+/*
+ * Name: curl_multi_timer_callback
+ *
+ * Desc: Called by libcurl whenever the library detects a change in the
+ * maximum number of milliseconds the app is allowed to wait before
+ * curl_multi_socket() or curl_multi_perform() must be called
+ * (to allow libcurl's timed events to take place).
+ *
+ * Returns: The callback should return zero.
+ */
+typedef int (*curl_multi_timer_callback)(CURLM *multi, /* multi handle */
+ long timeout_ms, /* see above */
+ void *userp); /* private callback
+ pointer */
+
+CURL_EXTERN CURLMcode curl_multi_socket(CURLM *multi_handle, curl_socket_t s,
+ int *running_handles);
+
+CURL_EXTERN CURLMcode curl_multi_socket_action(CURLM *multi_handle,
+ curl_socket_t s,
+ int ev_bitmask,
+ int *running_handles);
+
+CURL_EXTERN CURLMcode curl_multi_socket_all(CURLM *multi_handle,
+ int *running_handles);
+
+#ifndef CURL_ALLOW_OLD_MULTI_SOCKET
+/* This macro below was added in 7.16.3 to push users who recompile to use
+ the new curl_multi_socket_action() instead of the old curl_multi_socket()
+*/
+#define curl_multi_socket(x,y,z) curl_multi_socket_action(x,y,0,z)
+#endif
+
+/*
+ * Name: curl_multi_timeout()
+ *
+ * Desc: Returns the maximum number of milliseconds the app is allowed to
+ * wait before curl_multi_socket() or curl_multi_perform() must be
+ * called (to allow libcurl's timed events to take place).
+ *
+ * Returns: CURLM error code.
+ */
+CURL_EXTERN CURLMcode curl_multi_timeout(CURLM *multi_handle,
+ long *milliseconds);
+
+typedef enum {
+ /* This is the socket callback function pointer */
+ CURLOPT(CURLMOPT_SOCKETFUNCTION, CURLOPTTYPE_FUNCTIONPOINT, 1),
+
+ /* This is the argument passed to the socket callback */
+ CURLOPT(CURLMOPT_SOCKETDATA, CURLOPTTYPE_OBJECTPOINT, 2),
+
+ /* set to 1 to enable pipelining for this multi handle */
+ CURLOPT(CURLMOPT_PIPELINING, CURLOPTTYPE_LONG, 3),
+
+ /* This is the timer callback function pointer */
+ CURLOPT(CURLMOPT_TIMERFUNCTION, CURLOPTTYPE_FUNCTIONPOINT, 4),
+
+ /* This is the argument passed to the timer callback */
+ CURLOPT(CURLMOPT_TIMERDATA, CURLOPTTYPE_OBJECTPOINT, 5),
+
+ /* maximum number of entries in the connection cache */
+ CURLOPT(CURLMOPT_MAXCONNECTS, CURLOPTTYPE_LONG, 6),
+
+ /* maximum number of (pipelining) connections to one host */
+ CURLOPT(CURLMOPT_MAX_HOST_CONNECTIONS, CURLOPTTYPE_LONG, 7),
+
+ /* maximum number of requests in a pipeline */
+ CURLOPT(CURLMOPT_MAX_PIPELINE_LENGTH, CURLOPTTYPE_LONG, 8),
+
+ /* a connection with a content-length longer than this
+ will not be considered for pipelining */
+ CURLOPT(CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE, CURLOPTTYPE_OFF_T, 9),
+
+ /* a connection with a chunk length longer than this
+ will not be considered for pipelining */
+ CURLOPT(CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE, CURLOPTTYPE_OFF_T, 10),
+
+ /* a list of site names(+port) that are blocked from pipelining */
+ CURLOPT(CURLMOPT_PIPELINING_SITE_BL, CURLOPTTYPE_OBJECTPOINT, 11),
+
+ /* a list of server types that are blocked from pipelining */
+ CURLOPT(CURLMOPT_PIPELINING_SERVER_BL, CURLOPTTYPE_OBJECTPOINT, 12),
+
+ /* maximum number of open connections in total */
+ CURLOPT(CURLMOPT_MAX_TOTAL_CONNECTIONS, CURLOPTTYPE_LONG, 13),
+
+ /* This is the server push callback function pointer */
+ CURLOPT(CURLMOPT_PUSHFUNCTION, CURLOPTTYPE_FUNCTIONPOINT, 14),
+
+ /* This is the argument passed to the server push callback */
+ CURLOPT(CURLMOPT_PUSHDATA, CURLOPTTYPE_OBJECTPOINT, 15),
+
+ /* maximum number of concurrent streams to support on a connection */
+ CURLOPT(CURLMOPT_MAX_CONCURRENT_STREAMS, CURLOPTTYPE_LONG, 16),
+
+ CURLMOPT_LASTENTRY /* the last unused */
+} CURLMoption;
+
+
+/*
+ * Name: curl_multi_setopt()
+ *
+ * Desc: Sets options for the multi handle.
+ *
+ * Returns: CURLM error code.
+ */
+CURL_EXTERN CURLMcode curl_multi_setopt(CURLM *multi_handle,
+ CURLMoption option, ...);
+
+
+/*
+ * Name: curl_multi_assign()
+ *
+ * Desc: This function sets an association in the multi handle between the
+ * given socket and a private pointer of the application. This is
+ * (only) useful for curl_multi_socket uses.
+ *
+ * Returns: CURLM error code.
+ */
+CURL_EXTERN CURLMcode curl_multi_assign(CURLM *multi_handle,
+ curl_socket_t sockfd, void *sockp);
+
+
+/*
+ * Name: curl_push_callback
+ *
+ * Desc: This callback gets called when a new stream is being pushed by the
+ * server. It approves or denies the new stream. It can also decide
+ * to completely fail the connection.
+ *
+ * Returns: CURL_PUSH_OK, CURL_PUSH_DENY or CURL_PUSH_ERROROUT
+ */
+#define CURL_PUSH_OK 0
+#define CURL_PUSH_DENY 1
+#define CURL_PUSH_ERROROUT 2 /* added in 7.72.0 */
+
+struct curl_pushheaders; /* forward declaration only */
+
+CURL_EXTERN char *curl_pushheader_bynum(struct curl_pushheaders *h,
+ size_t num);
+CURL_EXTERN char *curl_pushheader_byname(struct curl_pushheaders *h,
+ const char *name);
+
+typedef int (*curl_push_callback)(CURL *parent,
+ CURL *easy,
+ size_t num_headers,
+ struct curl_pushheaders *headers,
+ void *userp);
+
+#ifdef __cplusplus
+} /* end of extern "C" */
+#endif
+
+#endif