mirror of
https://codeberg.org/kiss-community/repo
synced 2024-11-20 05:30:11 -07:00
83 lines
2.6 KiB
Groff
83 lines
2.6 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLMOPT_TIMERFUNCTION.md
|
|
.TH CURLMOPT_TIMERFUNCTION 3 "March 15 2024" libcurl
|
|
.SH NAME
|
|
CURLMOPT_TIMERFUNCTION \- callback to receive timeout values
|
|
.SH SYNOPSIS
|
|
.nf
|
|
#include <curl/curl.h>
|
|
|
|
int timer_callback(CURLM *multi, /* multi handle */
|
|
long timeout_ms, /* timeout in number of ms */
|
|
void *clientp); /* private callback pointer */
|
|
|
|
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_TIMERFUNCTION, timer_callback);
|
|
.fi
|
|
.SH DESCRIPTION
|
|
Pass a pointer to your callback function, which should match the prototype
|
|
shown above.
|
|
|
|
Certain features, such as timeouts and retries, require you to call libcurl
|
|
even when there is no activity on the file descriptors.
|
|
|
|
Your callback function \fBtimer_callback\fP should install a non\-repeating
|
|
timer with an expire time of \fBtimeout_ms\fP milliseconds. When that timer
|
|
fires, call either \fIcurl_multi_socket_action(3)\fP or
|
|
\fIcurl_multi_perform(3)\fP, depending on which interface you use.
|
|
|
|
A \fBtimeout_ms\fP value of \-1 passed to this callback means you should delete
|
|
the timer. All other values are valid expire times in number of milliseconds.
|
|
|
|
The \fBtimer_callback\fP is called when the timeout expire time is changed.
|
|
|
|
The \fBclientp\fP pointer is set with \fICURLMOPT_TIMERDATA(3)\fP.
|
|
|
|
The timer callback should return 0 on success, and \-1 on error. If this
|
|
callback returns error, \fBall\fP transfers currently in progress in this
|
|
multi handle are aborted and made to fail.
|
|
|
|
This callback can be used instead of, or in addition to,
|
|
\fIcurl_multi_timeout(3)\fP.
|
|
|
|
\fBWARNING:\fP do not call libcurl directly from within the callback itself
|
|
when the \fBtimeout_ms\fP value is zero, since it risks triggering an
|
|
unpleasant recursive behavior that immediately calls another call to the
|
|
callback with a zero timeout...
|
|
.SH DEFAULT
|
|
NULL
|
|
.SH PROTOCOLS
|
|
All
|
|
.SH EXAMPLE
|
|
.nf
|
|
struct priv {
|
|
void *custom;
|
|
};
|
|
|
|
static int timerfunc(CURLM *multi, long timeout_ms, void *clientp)
|
|
{
|
|
struct priv *mydata = clientp;
|
|
printf("our ptr: %p\\n", mydata->custom);
|
|
|
|
if(timeout_ms) {
|
|
/* this is the new single timeout to wait for */
|
|
}
|
|
else {
|
|
/* delete the timeout, nothing to wait for now */
|
|
}
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
struct priv mydata;
|
|
CURLM *multi = curl_multi_init();
|
|
curl_multi_setopt(multi, CURLMOPT_TIMERFUNCTION, timerfunc);
|
|
curl_multi_setopt(multi, CURLMOPT_TIMERDATA, &mydata);
|
|
}
|
|
.fi
|
|
.SH AVAILABILITY
|
|
Added in 7.16.0
|
|
.SH RETURN VALUE
|
|
Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
|
|
.SH SEE ALSO
|
|
.BR CURLMOPT_SOCKETFUNCTION (3),
|
|
.BR CURLMOPT_TIMERDATA (3)
|