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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLMOPT_PUSHDATA
+Section: 3
+Source: libcurl
+See-also:
+  - CURLMOPT_PIPELINING (3)
+  - CURLMOPT_PUSHFUNCTION (3)
+  - CURLOPT_PIPEWAIT (3)
+  - RFC 7540
+---
+
+# NAME
+
+CURLMOPT_PUSHDATA - pointer to pass to push callback
+
+# SYNOPSIS
+
+~~~c
+#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
+
+HTTP(S)
+
+# EXAMPLE
+
+~~~c
+#include <string.h>
+
+/* 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 *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 7.44.0
+
+# RETURN VALUE
+
+Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.