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CURLOPT_STREAM_DEPENDS_E

Section: curl_easy_setopt options (3)
Updated: May 31, 2017
Index Return to Main Contents

 

NAME

CURLOPT_STREAM_DEPENDS_E - set stream this transfer depends on execlusively  

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STREAM_DEPENDS_E, CURL *dephandle);  

DESCRIPTION

Pass a CURL * pointer in dephandle to identify the stream within the same connection that this stream is depending upon exclusively. That means it depends on it and sets the Exclusive bit.

The spec says "Including a dependency expresses a preference to allocate resources to the identified stream rather than to the dependent stream."

Setting a dependency with the exclusive flag for a reprioritized stream causes all the dependencies of the new parent stream to become dependent on the reprioritized stream.

This option can be set during transfer.

dephandle must not be the same as handle, that will cause this function to return an error. It must be another easy handle, and it also needs to be a handle of a transfer that will be sent over the same HTTP/2 connection for this option to have an actual effect.  

DEFAULT

NULL  

PROTOCOLS

HTTP/2  

EXAMPLE

CURL *curl = curl_easy_init();
CURL *curl2 = curl_easy_init(); /* a second handle */
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/one");

  /* the second depends on the first */
  curl_easy_setopt(curl2, CURLOPT_URL, "https://example.com/two");
  curl_easy_setopt(curl2, CURLOPT_STREAM_DEPENDS_E, curl);

  /* then add both to a multi handle and transfer them! */
}
 

AVAILABILITY

Added in 7.46.0  

RETURN VALUE

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.  

SEE ALSO

CURLOPT_STREAM_WEIGHT(3), CURLOPT_STREAM_DEPENDS(3),


 

Index

NAME
SYNOPSIS
DESCRIPTION
DEFAULT
PROTOCOLS
EXAMPLE
AVAILABILITY
RETURN VALUE
SEE ALSO





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