mirror of
https://github.com/curl/curl.git
synced 2024-12-15 06:40:09 +08:00
111 lines
3.9 KiB
Groff
111 lines
3.9 KiB
Groff
.\" **************************************************************************
|
|
.\" * _ _ ____ _
|
|
.\" * Project ___| | | | _ \| |
|
|
.\" * / __| | | | |_) | |
|
|
.\" * | (__| |_| | _ <| |___
|
|
.\" * \___|\___/|_| \_\_____|
|
|
.\" *
|
|
.\" * Copyright (C) 1998 - 2019, 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.
|
|
.\" *
|
|
.\" **************************************************************************
|
|
.\"
|
|
.TH CURLMOPT_SOCKETFUNCTION 3 "3 Nov 2016" "libcurl 7.39.0" "curl_multi_setopt options"
|
|
.SH NAME
|
|
CURLMOPT_SOCKETFUNCTION \- callback informed about what to wait for
|
|
.SH SYNOPSIS
|
|
.nf
|
|
#include <curl/curl.h>
|
|
|
|
int socket_callback(CURL *easy, /* easy handle */
|
|
curl_socket_t s, /* socket */
|
|
int what, /* describes the socket */
|
|
void *userp, /* private callback pointer */
|
|
void *socketp); /* private socket pointer */
|
|
|
|
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_SOCKETFUNCTION, socket_callback);
|
|
.SH DESCRIPTION
|
|
Pass a pointer to your callback function, which should match the prototype
|
|
shown above.
|
|
|
|
When the \fIcurl_multi_socket_action(3)\fP function is called, it informs the
|
|
application about updates in the socket (file descriptor) status by doing
|
|
none, one, or multiple calls to the \fBsocket_callback\fP. The callback
|
|
function gets status updates with changes since the previous time the callback
|
|
was called. If the given callback pointer is set to NULL, no callback will be
|
|
called.
|
|
.SH "CALLBACK ARGUMENTS"
|
|
\fIeasy\fP identifies the specific transfer for which this update is related.
|
|
|
|
\fIs\fP is the specific socket this function invocation concerns. If the
|
|
\fBwhat\fP argument is not CURL_POLL_REMOVE then it holds information about
|
|
what activity on this socket the application is supposed to
|
|
monitor. Subsequent calls to this callback might update the \fBwhat\fP bits
|
|
for a socket that is already monitored.
|
|
|
|
\fBuserp\fP is set with \fICURLMOPT_SOCKETDATA(3)\fP.
|
|
|
|
\fBsocketp\fP is set with \fIcurl_multi_assign(3)\fP or will be NULL.
|
|
|
|
The \fBwhat\fP parameter informs the callback on the status of the given
|
|
socket. It can hold one of these values:
|
|
.IP CURL_POLL_IN
|
|
Wait for incoming data. For the socket to become readable.
|
|
.IP CURL_POLL_OUT
|
|
Wait for outgoing data. For the socket to become writable.
|
|
.IP CURL_POLL_INOUT
|
|
Wait for incoming and outgoing data. For the socket to become readable or
|
|
writable.
|
|
.IP CURL_POLL_REMOVE
|
|
The specified socket/file descriptor is no longer used by libcurl.
|
|
.SH DEFAULT
|
|
NULL (no callback)
|
|
.SH PROTOCOLS
|
|
All
|
|
.SH EXAMPLE
|
|
.nf
|
|
static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
|
|
{
|
|
GlobalInfo *g = (GlobalInfo*) cbp;
|
|
SockInfo *fdp = (SockInfo*) sockp;
|
|
|
|
if(what == CURL_POLL_REMOVE) {
|
|
remsock(fdp);
|
|
}
|
|
else {
|
|
if(!fdp) {
|
|
addsock(s, e, what, g);
|
|
}
|
|
else {
|
|
setsock(fdp, s, e, what, g);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
main()
|
|
{
|
|
GlobalInfo setup;
|
|
/* ... use socket callback and custom pointer */
|
|
curl_multi_setopt(multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
|
|
curl_multi_setopt(multi, CURLMOPT_SOCKETDATA, &setup);
|
|
}
|
|
.fi
|
|
.SH AVAILABILITY
|
|
Added in 7.15.4
|
|
.SH RETURN VALUE
|
|
Returns CURLM_OK.
|
|
.SH "SEE ALSO"
|
|
.BR CURLMOPT_SOCKETDATA "(3), " curl_multi_socket_action "(3), "
|
|
.BR CURLMOPT_TIMERFUNCTION "(3) "
|