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1. The callback is better described in the option for setting it. Having it in a single place reduces the risk that one of them is wrong. 2. The "typical usage" is wrong since the functions described in this man page are both deprecated so they cannot be used in any "typical" way anymore. Closes #8262
91 lines
4.0 KiB
Groff
91 lines
4.0 KiB
Groff
.\" **************************************************************************
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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) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
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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
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.\" * 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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.\" **************************************************************************
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.TH curl_multi_socket 3 "9 Jul 2006" "libcurl 7.16.0" "libcurl Manual"
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.SH NAME
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curl_multi_socket \- reads/writes available data
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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_socket(CURLM *multi_handle, curl_socket_t sockfd,
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int *running_handles);
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CURLMcode curl_multi_socket_all(CURLM *multi_handle,
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int *running_handles);
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.fi
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.SH DESCRIPTION
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These functions are deprecated. Do not use. See
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\fIcurl_multi_socket_action(3)\fP instead.
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At return, the integer \fBrunning_handles\fP points to will contain the number
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of still running easy handles within the multi handle. When this number
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reaches zero, all transfers are complete/done. Note that when you call
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\fIcurl_multi_socket_action(3)\fP on a specific socket and the counter
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decreases by one, it DOES NOT necessarily mean that this exact socket/transfer
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is the one that completed. Use \fIcurl_multi_info_read(3)\fP to figure out
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which easy handle that completed.
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The \fIcurl_multi_socket_action(3)\fP functions inform the application about
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updates in the socket (file descriptor) status by doing none, one, or multiple
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calls to the socket callback function set with the
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\fICURLMOPT_SOCKETFUNCTION(3)\fP option to \fIcurl_multi_setopt(3)\fP. They
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update the status with changes since the previous time the callback was
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called.
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Get the timeout time by setting the \fICURLMOPT_TIMERFUNCTION(3)\fP option
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with \fIcurl_multi_setopt(3)\fP. Your application will then get called with
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information on how long to wait for socket actions at most before doing the
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timeout action: call the \fIcurl_multi_socket_action(3)\fP function with the
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\fBsockfd\fP argument set to CURL_SOCKET_TIMEOUT. You can also use the
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\fIcurl_multi_timeout(3)\fP function to poll the value at any given time, but
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for an event-based system using the callback is far better than relying on
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polling the timeout value.
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Usage of \fIcurl_multi_socket(3)\fP is deprecated, whereas the function is
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equivalent to \fIcurl_multi_socket_action(3)\fP with \fBev_bitmask\fP set to
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0.
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Force libcurl to (re-)check all its internal sockets and transfers instead of
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just a single one by calling \fIcurl_multi_socket_all(3)\fP. Note that there
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should not be any reason to use this function.
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.SH EXAMPLE
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.nf
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/* the event-library gets told when there activity on the socket 'fd',
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which we translate to a call to curl_multi_socket_action() */
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int running;
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rc = curl_multi_socket(multi_handle, fd, &running);
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.fi
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.SH AVAILABILITY
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This function was added in libcurl 7.15.4, and is deemed stable since
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7.16.0.
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\fIcurl_multi_socket(3)\fP is deprecated, use
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\fIcurl_multi_socket_action(3)\fP instead!
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.SH "RETURN VALUE"
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CURLMcode type, general libcurl multi interface error code.
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The return code is for the whole multi stack. Problems still might have
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occurred on individual transfers even when one of these functions return OK.
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.SH "SEE ALSO"
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.BR curl_multi_cleanup "(3), " curl_multi_init "(3), "
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.BR curl_multi_fdset "(3), " curl_multi_info_read "(3), "
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.BR "the hiperfifo.c example"
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