docs/libcurl/opts/CURLMOPT_PUSHDATA.3

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.TH CURLMOPT_PUSHDATA 3 "November 04, 2020" "libcurl 7.78.0" "curl_multi_setopt options"

.SH NAME
CURLMOPT_PUSHDATA \- pointer to pass to push callback
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_PUSHDATA, void *pointer);
.fi
.SH DESCRIPTION
Set \fIpointer\fP to pass as the last argument to the
\fICURLMOPT_PUSHFUNCTION(3)\fP callback. The pointer will not be touched or
used by libcurl itself, only passed on to the callback function.
.SH DEFAULT
NULL
.SH PROTOCOLS
HTTP(S)
.SH EXAMPLE
.nf
/* only allow pushes for file names starting with "push-" */
int push_callback(CURL *parent,
                  CURL *easy,
                  size_t num_headers,
                  struct curl_pushheaders *headers,
                  void *userp)
{
  char *headp;
  int *transfers = (int *)userp;
  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;
}

curl_multi_setopt(multi, CURLMOPT_PUSHFUNCTION, push_callback);
curl_multi_setopt(multi, CURLMOPT_PUSHDATA, &counter);
.fi
.SH AVAILABILITY
Added in 7.44.0
.SH RETURN VALUE
Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR CURLMOPT_PUSHFUNCTION "(3), " CURLMOPT_PIPELINING "(3), "
.BR CURLOPT_PIPEWAIT "(3), "
.BR RFC 7540