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99 lines
3.1 KiB
Groff
99 lines
3.1 KiB
Groff
.\" generated by cd2nroff 0.1 from curl_multi_wait.md
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.TH curl_multi_wait 3 libcurl
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.SH NAME
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curl_multi_wait \- polls on all easy handles in a multi handle
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLMcode curl_multi_wait(CURLM *multi_handle,
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struct curl_waitfd extra_fds[],
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unsigned int extra_nfds,
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int timeout_ms,
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int *numfds);
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.fi
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.SH DESCRIPTION
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\fIcurl_multi_wait(3)\fP polls all file descriptors used by the curl easy
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handles contained in the given multi handle set. It blocks until activity is
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detected on at least one of the handles or \fItimeout_ms\fP has passed.
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Alternatively, if the multi handle has a pending internal timeout that has a
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shorter expiry time than \fItimeout_ms\fP, that shorter time is be used
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instead to make sure timeout accuracy is reasonably kept.
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The calling application may pass additional \fIcurl_waitfd\fP structures which
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are similar to \fIpoll(2)\fP\(aqs \fIpollfd\fP structure to be waited on in the
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same call.
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On completion, if \fInumfds\fP is non\-NULL, it gets populated with the total
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number of file descriptors on which interesting events occurred. This number
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can include both libcurl internal descriptors as well as descriptors provided
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in \fIextra_fds\fP.
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If no extra file descriptors are provided and libcurl has no file descriptor
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to offer to wait for, this function returns immediately. (Consider using
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\fIcurl_multi_poll(3)\fP to avoid this behavior.)
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This function is encouraged to be used instead of select(3) when using the
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multi interface to allow applications to easier circumvent the common problem
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with 1024 maximum file descriptors.
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.SH curl_waitfd
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.nf
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struct curl_waitfd {
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curl_socket_t fd;
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short events;
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short revents;
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};
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.fi
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.IP CURL_WAIT_POLLIN
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Bit flag to \fIcurl_waitfd.events\fP indicating the socket should poll on read
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events such as new data received.
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.IP CURL_WAIT_POLLPRI
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Bit flag to \fIcurl_waitfd.events\fP indicating the socket should poll on high
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priority read events such as out of band data.
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.IP CURL_WAIT_POLLOUT
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Bit flag to \fIcurl_waitfd.events\fP indicating the socket should poll on
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write events such as the socket being clear to write without blocking.
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.SH PROTOCOLS
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All
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.SH EXAMPLE
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.nf
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int main(void)
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{
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CURL *easy;
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CURLM *multi = curl_multi_init();
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int still_running;
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/* add the individual easy handle */
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curl_multi_add_handle(multi, easy);
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do {
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CURLMcode mc;
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int numfds;
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mc = curl_multi_perform(multi, &still_running);
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if(mc == CURLM_OK) {
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/* wait for activity, timeout or "nothing" */
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mc = curl_multi_wait(multi, NULL, 0, 1000, &numfds);
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}
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if(mc != CURLM_OK) {
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fprintf(stderr, "curl_multi failed, code %d.\\n", mc);
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break;
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}
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} while(still_running);
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curl_multi_remove_handle(multi, easy);
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}
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.fi
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.SH AVAILABILITY
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This function was added in libcurl 7.28.0.
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.SH RETURN VALUE
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CURLMcode type, general libcurl multi interface error code. See
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\fIlibcurl\-errors(3)\fP
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.SH SEE ALSO
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.BR curl_multi_fdset (3),
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.BR curl_multi_perform (3),
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.BR curl_multi_poll (3)
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