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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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22 .TH curl_multi_poll 3 "29 Jul 2019" "libcurl 7.66.0" "libcurl Manual"
23 .SH NAME
24 curl_multi_poll - polls on all easy handles in a multi handle
25 .SH SYNOPSIS
26 .nf
27 #include <curl/curl.h>
28
29 CURLMcode curl_multi_poll(CURLM *multi_handle,
30 struct curl_waitfd extra_fds[],
31 unsigned int extra_nfds,
32 int timeout_ms,
33 int *numfds);
34 .ad
35 .SH DESCRIPTION
36 \fIcurl_multi_poll(3)\fP polls all file descriptors used by the curl easy
37 handles contained in the given multi handle set. It will block until activity
38 is detected on at least one of the handles or \fItimeout_ms\fP has passed.
39 Alternatively, if the multi handle has a pending internal timeout that has a
40 shorter expiry time than \fItimeout_ms\fP, that shorter time will be used
41 instead to make sure timeout accuracy is reasonably kept.
42
43 The calling application may pass additional curl_waitfd structures which are
44 similar to \fIpoll(2)\fP's pollfd structure to be waited on in the same call.
45
46 On completion, if \fInumfds\fP is non-NULL, it will be populated with the
47 total number of file descriptors on which interesting events occurred. This
48 number can include both libcurl internal descriptors as well as descriptors
49 provided in \fIextra_fds\fP.
50
51 If no extra file descriptors are provided and libcurl has no file descriptor
52 to offer to wait for, this function will instead wait during \fItimeout_ms\fP
53 milliseconds (or shorter if an internal timer indicates so). This is the
54 detail that makes this function different than \fIcurl_multi_wait(3)\fP.
55
56 This function is encouraged to be used instead of select(3) when using the
57 multi interface to allow applications to easier circumvent the common problem
58 with 1024 maximum file descriptors.
59 .SH curl_waitfd
60 .nf
61 struct curl_waitfd {
62 curl_socket_t fd;
63 short events;
64 short revents;
65 };
66 .fi
67 .IP CURL_WAIT_POLLIN
68 Bit flag to curl_waitfd.events indicating the socket should poll on read
69 events such as new data received.
70 .IP CURL_WAIT_POLLPRI
71 Bit flag to curl_waitfd.events indicating the socket should poll on high
72 priority read events such as out of band data.
73 .IP CURL_WAIT_POLLOUT
74 Bit flag to curl_waitfd.events indicating the socket should poll on write
75 events such as the socket being clear to write without blocking.
76 .SH EXAMPLE
77 .nf
78 CURL *easy_handle;
79 CURLM *multi_handle;
80
81 /* add the individual easy handle */
82 curl_multi_add_handle(multi_handle, easy_handle);
83
84 do {
85 CURLMcode mc;
86 int numfds;
87
88 mc = curl_multi_perform(multi_handle, &still_running);
89
90 if(mc == CURLM_OK) {
91 /* wait for activity or timeout */
92 mc = curl_multi_poll(multi_handle, NULL, 0, 1000, &numfds);
93 }
94
95 if(mc != CURLM_OK) {
96 fprintf(stderr, "curl_multi failed, code %d.\\n", mc);
97 break;
98 }
99
100 } while(still_running);
101
102 curl_multi_remove_handle(multi_handle, easy_handle);
103 .fi
104 .SH RETURN VALUE
105 CURLMcode type, general libcurl multi interface error code. See
106 \fIlibcurl-errors(3)\fP
107 .SH AVAILABILITY
108 This function was added in libcurl 7.66.0.
109 .SH "SEE ALSO"
110 .BR curl_multi_fdset "(3), " curl_multi_perform "(3), " curl_multi_wait "(3)"