lib: add curl_multi_waitfds
New function call, similar to curl_multi_fdset() Closes #13135
This commit is contained in:
Dmitry Karpov
Daniel Stenberg
Родитель
e469ac4494
Коммит
02beac6bb6
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@ -87,6 +87,7 @@ man_MANS = \
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curl_multi_timeout.3 \
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curl_multi_wakeup.3 \
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curl_multi_wait.3 \
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curl_multi_waitfds.3 \
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curl_pushheader_bynum.3 \
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curl_pushheader_byname.3 \
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curl_share_cleanup.3 \
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@ -10,6 +10,7 @@ See-also:
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- curl_multi_perform (3)
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- curl_multi_timeout (3)
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- curl_multi_wait (3)
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- curl_multi_waitfds (3)
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- select (2)
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Protocol:
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- All
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@ -0,0 +1,107 @@
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---
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c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
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SPDX-License-Identifier: curl
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Title: curl_multi_waitfds
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Section: 3
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Source: libcurl
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See-also:
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- curl_multi_perform (3)
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- curl_multi_poll (3)
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- curl_multi_wait (3)
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- curl_multi_fdset (3)
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---
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# NAME
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curl_multi_waitfds - extracts file descriptor information from a multi handle
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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#include <stdlib.h>
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CURLMcode curl_multi_waitfds(CURLM *multi,
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struct curl_waitfd *ufds,
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unsigned int size,
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unsigned int *fd_count);
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~~~
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# DESCRIPTION
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This function extracts *curl_waitfd* structures which are similar to
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*poll(2)*'s *pollfd* structure from a given multi_handle.
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These structures can be used for polling on multi_handle file descriptors in a
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fashion similar to curl_multi_poll(3). The curl_multi_perform(3)
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function should be called as soon as one of them is ready to be read from or
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written to.
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libcurl fills provided *ufds* array up to the *size*.
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If a number of descriptors used by the multi_handle is greater than the
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*size* parameter then libcurl returns CURLM_OUT_OF_MEMORY error.
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If the *fd_count* argument is not a null pointer, it points to a variable
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that on returns specifies the number of descriptors used by the multi_handle to
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be checked for being ready to read or write.
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The client code can pass *size* equal to zero just to get the number of the
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descriptors and allocate appropriate storage for them to be used in a
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subsequent function call.
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURLMcode mc;
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struct curl_waitfd *ufds;
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CURLM *multi = curl_multi_init();
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do {
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/* call curl_multi_perform() */
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/* get the count of file descriptors from the transfers */
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unsigned int fd_count = 0;
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mc = curl_multi_waitfds(multi, NULL, 0, &fd_count);
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if(mc != CURLM_OK) {
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fprintf(stderr, "curl_multi_waitfds() failed, code %d.\n", mc);
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break;
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}
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if(!fd_count)
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continue; /* no descriptors yet */
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/* Allocate storage for our descriptors.
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* Note that a better approach can be used to minimize allocations and
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* deallocations, if needed, like pre-allocated or grow-only array.
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*/
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ufds = (struct curl_waitfd*)malloc(fd_count * sizeof(struct curl_waitfd));
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/* get wait descriptors from the transfers and put them into array. */
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mc = curl_multi_waitfds(multi, ufds, fd_count, NULL);
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if(mc != CURLM_OK) {
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fprintf(stderr, "curl_multi_waitfds() failed, code %d.\n", mc);
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free(ufds);
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break;
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}
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/* Do polling on descriptors in ufds */
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free(ufds);
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} while (!mc);
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}
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~~~
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# AVAILABILITY
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Added in 8.8.0
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# RETURN VALUE
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**CURLMcode** type, general libcurl multi interface error code. See
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libcurl-errors(3)
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@ -464,6 +464,20 @@ typedef int (*curl_push_callback)(CURL *parent,
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struct curl_pushheaders *headers,
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void *userp);
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/*
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* Name: curl_multi_waitfds()
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*
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* Desc: Ask curl for fds for polling. The app can use these to poll on.
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* We want curl_multi_perform() called as soon as one of them are
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* ready. Passing zero size allows to get just a number of fds.
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*
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* Returns: CURLMcode type, general multi error code.
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*/
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CURL_EXTERN CURLMcode curl_multi_waitfds(CURLM *multi,
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struct curl_waitfd *ufds,
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unsigned int size,
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unsigned int *fd_count);
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#ifdef __cplusplus
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} /* end of extern "C" */
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#endif
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62
lib/multi.c
62
lib/multi.c
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@ -1208,6 +1208,68 @@ CURLMcode curl_multi_fdset(struct Curl_multi *multi,
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return CURLM_OK;
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}
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CURLMcode curl_multi_waitfds(struct Curl_multi *multi,
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struct curl_waitfd *ufds,
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unsigned int size,
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unsigned int *fd_count)
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{
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struct Curl_easy *data;
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unsigned int nfds = 0;
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struct easy_pollset ps;
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unsigned int i;
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CURLMcode result = CURLM_OK;
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struct curl_waitfd *ufd;
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unsigned int j;
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if(!ufds)
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return CURLM_BAD_FUNCTION_ARGUMENT;
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if(!GOOD_MULTI_HANDLE(multi))
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return CURLM_BAD_HANDLE;
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if(multi->in_callback)
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return CURLM_RECURSIVE_API_CALL;
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memset(&ps, 0, sizeof(ps));
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for(data = multi->easyp; data; data = data->next) {
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multi_getsock(data, &ps);
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for(i = 0; i < ps.num; i++) {
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if(nfds < size) {
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curl_socket_t fd = ps.sockets[i];
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int fd_idx = -1;
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/* Simple linear search to skip an already added descriptor */
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for(j = 0; j < nfds; j++) {
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if(ufds[j].fd == fd) {
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fd_idx = (int)j;
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break;
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}
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}
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if(fd_idx < 0) {
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ufd = &ufds[nfds++];
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ufd->fd = ps.sockets[i];
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ufd->events = 0;
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}
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else
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ufd = &ufds[fd_idx];
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if(ps.actions[i] & CURL_POLL_IN)
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ufd->events |= CURL_WAIT_POLLIN;
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if(ps.actions[i] & CURL_POLL_OUT)
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ufd->events |= CURL_WAIT_POLLOUT;
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}
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else
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return CURLM_OUT_OF_MEMORY;
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}
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}
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if(fd_count)
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*fd_count = nfds;
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return result;
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}
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#ifdef USE_WINSOCK
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/* Reset FD_WRITE for TCP sockets. Nothing is actually sent. UDP sockets can't
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* be reset this way because an empty datagram would be sent. #9203
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@ -64,6 +64,7 @@ curl_multi_socket_all
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curl_multi_strerror
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curl_multi_timeout
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curl_multi_wait
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curl_multi_waitfds
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curl_multi_wakeup
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curl_mvaprintf
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curl_mvfprintf
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@ -114,6 +114,7 @@ my %api = (
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'curl_multi_strerror' => 'API',
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'curl_multi_timeout' => 'API',
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'curl_multi_wait' => 'API',
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'curl_multi_waitfds' => 'API',
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'curl_multi_wakeup' => 'API',
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'curl_mvaprintf' => 'API',
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'curl_mvfprintf' => 'API',
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@ -248,7 +248,7 @@ test2200 test2201 test2202 test2203 test2204 test2205 \
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\
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test2300 test2301 test2302 test2303 test2304 test2305 test2306 test2307 \
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\
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test2400 test2401 test2402 test2403 test2404 \
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test2400 test2401 test2402 test2403 test2404 test2405 \
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\
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test2500 test2501 test2502 test2503 \
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\
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@ -109,6 +109,7 @@ curl_multi_assign
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curl_multi_get_handles
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curl_pushheader_bynum
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curl_pushheader_byname
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curl_multi_waitfds
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curl_easy_option_by_name
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curl_easy_option_by_id
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curl_easy_option_next
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@ -0,0 +1,51 @@
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<testcase>
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<info>
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<keywords>
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multi
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HTTP
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HTTP/2
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</keywords>
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</info>
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# Server-side
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<reply>
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<data nocheck="yes">
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HTTP/1.1 200 OK
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Date: Tue, 09 Nov 2010 14:49:00 GMT
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Server: test-server/fake
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Last-Modified: Tue, 13 Jun 2000 12:10:00 GMT
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ETag: "21025-dc7-39462498"
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Accept-Ranges: bytes
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Content-Length: 6007
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Connection: close
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Content-Type: text/html
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Funny-head: yesyes
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-foo-
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%repeat[1000 x foobar]%
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</data>
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</reply>
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# Client-side
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<client>
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<server>
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http
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http/2
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</server>
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<tool>
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lib%TESTNUMBER
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</tool>
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<name>
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checking curl_multi_waitfds functionality
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</name>
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<command>
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http://%HOSTIP:%HTTP2PORT/%TESTNUMBER
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</command>
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</client>
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# Verify data after the test has been "shot"
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<verify>
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<protocol>
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</protocol>
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</verify>
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</testcase>
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@ -74,7 +74,7 @@ noinst_PROGRAMS = chkhostname libauthretry libntlmconnect libprereq \
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lib1960 lib1964 \
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lib1970 lib1971 lib1972 lib1973 lib1974 lib1975 \
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lib2301 lib2302 lib2304 lib2305 lib2306 \
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lib2402 lib2404 \
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lib2402 lib2404 lib2405 \
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lib2502 \
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lib3010 lib3025 lib3026 lib3027 \
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lib3100 lib3101 lib3102 lib3103
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@ -683,6 +683,9 @@ lib2402_LDADD = $(TESTUTIL_LIBS)
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lib2404_SOURCES = lib2404.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
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lib2404_LDADD = $(TESTUTIL_LIBS)
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lib2405_SOURCES = lib2405.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
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lib2405_LDADD = $(TESTUTIL_LIBS)
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lib2502_SOURCES = lib2502.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
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lib2502_LDADD = $(TESTUTIL_LIBS)
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|
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@ -0,0 +1,309 @@
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Dmitry Karpov <dkarpov1970@gmail.com>
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
|
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
|
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* copies of the Software, and permit persons to whom the Software is
|
||||
* furnished to do so, under the terms of the COPYING file.
|
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*
|
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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/*
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* The purpose of this test is to test behavior of curl_multi_waitfds
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* function in different scenarios:
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* empty multi handle (expected zero descriptors),
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* HTTP1 amd HTTP2 (no multiplexing) two transfers (expected two descriptors),
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* HTTP2 with multiplexing (expected one descriptors)
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*
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* It is also expected that all transfers run by multi-handle should complete
|
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* successfully.
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*/
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#include "test.h"
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#include "testutil.h"
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#include "warnless.h"
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#include "memdebug.h"
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/* ---------------------------------------------------------------- */
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#define test_check(expected_fds) \
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if(res != CURLE_OK) { \
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fprintf(stderr, "test failed with code: %d\n", res); \
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goto test_cleanup; \
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} \
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else if(fd_count != expected_fds) { \
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fprintf(stderr, "Max number of waitfds: %d not as expected: %d\n", \
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fd_count, expected_fds); \
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res = TEST_ERR_FAILURE; \
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goto test_cleanup; \
|
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}
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|
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#define test_run_check(option, expected_fds) do { \
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res = test_run(URL, option, &fd_count); \
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test_check(expected_fds); \
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} while(0)
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/* ---------------------------------------------------------------- */
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enum {
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TEST_USE_HTTP1 = 0,
|
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TEST_USE_HTTP2,
|
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TEST_USE_HTTP2_MPLEX
|
||||
};
|
||||
|
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static size_t emptyWriteFunc(void *ptr, size_t size, size_t nmemb,
|
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void *data) {
|
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(void)ptr; (void)data;
|
||||
return size * nmemb;
|
||||
}
|
||||
|
||||
static int set_easy(char *URL, CURL *easy, long option)
|
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{
|
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int res = CURLE_OK;
|
||||
|
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/* First set the URL that is about to receive our POST. */
|
||||
easy_setopt(easy, CURLOPT_URL, URL);
|
||||
|
||||
/* get verbose debug output please */
|
||||
easy_setopt(easy, CURLOPT_VERBOSE, 1L);
|
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|
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switch(option) {
|
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case TEST_USE_HTTP1:
|
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/* go http1 */
|
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easy_setopt(easy, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
|
||||
break;
|
||||
|
||||
case TEST_USE_HTTP2:
|
||||
/* go http2 */
|
||||
easy_setopt(easy, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
|
||||
break;
|
||||
|
||||
case TEST_USE_HTTP2_MPLEX:
|
||||
/* go http2 with multiplexing */
|
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easy_setopt(easy, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
|
||||
easy_setopt(easy, CURLOPT_PIPEWAIT, 1L);
|
||||
break;
|
||||
}
|
||||
|
||||
/* no peer verify */
|
||||
easy_setopt(easy, CURLOPT_SSL_VERIFYPEER, 0L);
|
||||
easy_setopt(easy, CURLOPT_SSL_VERIFYHOST, 0L);
|
||||
|
||||
/* include headers */
|
||||
easy_setopt(easy, CURLOPT_HEADER, 1L);
|
||||
|
||||
/* empty write function */
|
||||
easy_setopt(easy, CURLOPT_WRITEFUNCTION, emptyWriteFunc);
|
||||
|
||||
test_cleanup:
|
||||
return res;
|
||||
}
|
||||
|
||||
static int test_run(char *URL, long option, unsigned int *max_fd_count)
|
||||
{
|
||||
CURLMcode mc = CURLM_OK;
|
||||
CURLM *multi = NULL;
|
||||
CURLM *multi1 = NULL;
|
||||
|
||||
CURL *easy1 = NULL;
|
||||
CURL *easy2 = NULL;
|
||||
|
||||
unsigned int max_count = 0;
|
||||
|
||||
int still_running; /* keep number of running handles */
|
||||
CURLMsg *msg; /* for picking up messages with the transfer status */
|
||||
int msgs_left; /* how many messages are left */
|
||||
|
||||
CURLcode result;
|
||||
int res = CURLE_OK;
|
||||
|
||||
struct curl_waitfd ufds[10];
|
||||
struct curl_waitfd ufds1[10];
|
||||
int numfds;
|
||||
|
||||
easy_init(easy1);
|
||||
easy_init(easy2);
|
||||
|
||||
if(set_easy(URL, easy1, option) != CURLE_OK)
|
||||
goto test_cleanup;
|
||||
|
||||
if(set_easy(URL, easy2, option) != CURLE_OK)
|
||||
goto test_cleanup;
|
||||
|
||||
multi_init(multi);
|
||||
multi_init(multi1);
|
||||
|
||||
if(option == TEST_USE_HTTP2_MPLEX)
|
||||
multi_setopt(multi, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
|
||||
|
||||
multi_add_handle(multi, easy1);
|
||||
multi_add_handle(multi, easy2);
|
||||
|
||||
while(!mc) {
|
||||
/* get the count of file descriptors from the transfers */
|
||||
unsigned int fd_count = 0;
|
||||
|
||||
mc = curl_multi_perform(multi, &still_running);
|
||||
if(!still_running || mc != CURLM_OK)
|
||||
break;
|
||||
|
||||
mc = curl_multi_waitfds(multi, ufds, 10, &fd_count);
|
||||
|
||||
if(mc != CURLM_OK) {
|
||||
fprintf(stderr, "curl_multi_waitfds() failed, code %d.\n", mc);
|
||||
res = TEST_ERR_FAILURE;
|
||||
break;
|
||||
}
|
||||
|
||||
if(!fd_count)
|
||||
continue; /* no descriptors yet */
|
||||
|
||||
/* checking case when we don't have enough space for waitfds */
|
||||
mc = curl_multi_waitfds(multi, ufds1, fd_count - 1, NULL);
|
||||
|
||||
if(mc != CURLM_OUT_OF_MEMORY) {
|
||||
fprintf(stderr, "curl_multi_waitfds() return code %d instead of "
|
||||
"CURLM_OUT_OF_MEMORY.\n", mc);
|
||||
res = TEST_ERR_FAILURE;
|
||||
break;
|
||||
}
|
||||
|
||||
if(fd_count > max_count)
|
||||
max_count = fd_count;
|
||||
|
||||
/* Do polling on descriptors in ufds in Multi 1 */
|
||||
mc = curl_multi_poll(multi1, ufds, fd_count, 500, &numfds);
|
||||
|
||||
if(mc != CURLM_OK) {
|
||||
fprintf(stderr, "curl_multi_poll() failed, code %d.\\n", mc);
|
||||
res = TEST_ERR_FAILURE;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
for(;;) {
|
||||
msg = curl_multi_info_read(multi, &msgs_left);
|
||||
if(!msg)
|
||||
break;
|
||||
if(msg->msg == CURLMSG_DONE) {
|
||||
result = msg->data.result;
|
||||
|
||||
if(!res)
|
||||
res = (int)result;
|
||||
}
|
||||
}
|
||||
|
||||
curl_multi_remove_handle(multi, easy1);
|
||||
curl_multi_remove_handle(multi, easy2);
|
||||
|
||||
test_cleanup:
|
||||
curl_easy_cleanup(easy1);
|
||||
curl_easy_cleanup(easy2);
|
||||
|
||||
curl_multi_cleanup(multi);
|
||||
curl_multi_cleanup(multi1);
|
||||
|
||||
if(max_fd_count)
|
||||
*max_fd_count = max_count;
|
||||
return res;
|
||||
}
|
||||
|
||||
static int empty_multi_test(void)
|
||||
{
|
||||
CURLMcode mc = CURLM_OK;
|
||||
CURLM *multi = NULL;
|
||||
CURL *easy = NULL;
|
||||
|
||||
struct curl_waitfd ufds[10];
|
||||
|
||||
int res = CURLE_OK;
|
||||
unsigned int fd_count = 0;
|
||||
|
||||
multi_init(multi);
|
||||
|
||||
/* calling curl_multi_waitfds() on an empty multi handle. */
|
||||
mc = curl_multi_waitfds(multi, ufds, 10, &fd_count);
|
||||
|
||||
if(mc != CURLM_OK) {
|
||||
fprintf(stderr, "curl_multi_waitfds() failed, code %d.\n", mc);
|
||||
res = TEST_ERR_FAILURE;
|
||||
goto test_cleanup;
|
||||
}
|
||||
else if(fd_count > 0) {
|
||||
fprintf(stderr, "curl_multi_waitfds() returned non-zero count of "
|
||||
"waitfds: %d.\n", fd_count);
|
||||
res = TEST_ERR_FAILURE;
|
||||
goto test_cleanup;
|
||||
}
|
||||
|
||||
/* calling curl_multi_waitfds() on multi handle with added easy handle. */
|
||||
easy_init(easy);
|
||||
|
||||
if(set_easy((char *)"http://example.com", easy, TEST_USE_HTTP1) != CURLE_OK)
|
||||
goto test_cleanup;
|
||||
|
||||
multi_add_handle(multi, easy);
|
||||
|
||||
mc = curl_multi_waitfds(multi, ufds, 10, &fd_count);
|
||||
|
||||
if(mc != CURLM_OK) {
|
||||
fprintf(stderr, "curl_multi_waitfds() failed, code %d.\n", mc);
|
||||
res = TEST_ERR_FAILURE;
|
||||
goto test_cleanup;
|
||||
}
|
||||
else if(fd_count > 0) {
|
||||
fprintf(stderr, "curl_multi_waitfds() returned non-zero count of "
|
||||
"waitfds: %d.\n", fd_count);
|
||||
res = TEST_ERR_FAILURE;
|
||||
goto test_cleanup;
|
||||
}
|
||||
|
||||
curl_multi_remove_handle(multi, easy);
|
||||
|
||||
test_cleanup:
|
||||
curl_easy_cleanup(easy);
|
||||
curl_multi_cleanup(multi);
|
||||
return res;
|
||||
}
|
||||
|
||||
int test(char *URL)
|
||||
{
|
||||
int res = CURLE_OK;
|
||||
unsigned int fd_count = 0;
|
||||
|
||||
global_init(CURL_GLOBAL_ALL);
|
||||
|
||||
/* Testing curl_multi_waitfds on empty and not started handles */
|
||||
res = empty_multi_test();
|
||||
if(res != CURLE_OK)
|
||||
goto test_cleanup;
|
||||
|
||||
/* HTTP1, expected 2 waitfds - one for each transfer */
|
||||
test_run_check(TEST_USE_HTTP1, 2);
|
||||
|
||||
/* HTTP2, expected 2 waitfds - one for each transfer */
|
||||
test_run_check(TEST_USE_HTTP2, 2);
|
||||
|
||||
/* HTTP2 with multiplexing, expected 1 waitfds - one for all transfers */
|
||||
test_run_check(TEST_USE_HTTP2_MPLEX, 1);
|
||||
|
||||
test_cleanup:
|
||||
curl_global_cleanup();
|
||||
return res;
|
||||
}
|
||||
Загрузка…
Ссылка в новой задаче