CURLMOPT_PUSHDATA - pointer to pass to push callback

Added in curl 7.44.0

NULL

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.

#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); }

CURLMOPT_PUSHDATA - pointer to pass to push callback

This functionality affects http only

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).

CURLMOPT_PIPELINING(3), CURLMOPT_PUSHFUNCTION(3), CURLOPT_PIPEWAIT(3), RFC7540 libcurl 2025-06-16 CURLMOPT_PUSHDATA(3)

#include <curl/curl.h> CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_PUSHDATA, void *pointer);