Tribblix: manual page: CURLMOPT

CURLMOPT_PUSHDATA(3) Introduction to Library Functions CURLMOPT_PUSHDATA(3)

NAME

CURLMOPT_PUSHDATA - pointer to pass to push callback

SYNOPSIS

#include <curl/curl.h>

CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_PUSHDATA, void *pointer);

DESCRIPTION

Set a pointer to pass as the last argument to the
CURLMOPT_PUSHFUNCTION(3) callback. The pointer is not touched or used
by libcurl itself, only passed on to the callback function.

DEFAULT

NULL

PROTOCOLS

This functionality affects http only

EXAMPLE

#include <string.h>

/* only allow pushes for filenames starting with "push-" */
int push_callback(CURL *parent,
CURL *easy,
size_t num_headers,
struct curl_pushheaders *headers,
void *clientp)
{
char *headp;
int *transfers = (int *)clientp;
FILE *out;
headp = curl_pushheader_byname(headers, ":path");
if(headp && !strncmp(headp, "/push-", 6)) {
fprintf(stderr, "The PATH is %s\n", headp);

/* save the push here */
out = fopen("pushed-stream", "wb");

/* write to this file */
curl_easy_setopt(easy, CURLOPT_WRITEDATA, out);

(*transfers)++; /* one more */

return CURL_PUSH_OK;
}
return CURL_PUSH_DENY;
}

int main(void)
{
int counter;
CURLM *multi = curl_multi_init();
curl_multi_setopt(multi, CURLMOPT_PUSHFUNCTION, push_callback);
curl_multi_setopt(multi, CURLMOPT_PUSHDATA, &counter);
}

AVAILABILITY

Added in curl 7.44.0

RETURN VALUE

curl_multi_setopt(3) returns a CURLMcode indicating success or error.

CURLM_OK (0) means everything was OK, non-zero means an error
occurred, see libcurl-errors(3).