.\" generated by cd2nroff 0.1 from CURLOPT_STREAM_DEPENDS_E.md
.TH CURLOPT_STREAM_DEPENDS_E 3 "2024-11-18" libcurl
.SH NAME
CURLOPT_STREAM_DEPENDS_E \- stream this transfer depends on exclusively
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STREAM_DEPENDS_E,
                          CURL *dephandle);
.fi
.SH DESCRIPTION
Pass a CURL pointer in \fIdephandle\fP 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.

\fIdephandle\fP must not be the same as \fIhandle\fP, that makes this function return
an error. It must be another easy handle, and it also needs to be a handle of
a transfer that is about to be sent over the same HTTP/2 connection for this
option to have an actual effect.
.SH DEFAULT
NULL
.SH PROTOCOLS
This functionality affects http only
.SH EXAMPLE
.nf
int main(void)
{
  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! */
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.46.0
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH SEE ALSO
.BR CURLMOPT_PIPELINING (3),
.BR CURLOPT_HTTP_VERSION (3),
.BR CURLOPT_STREAM_DEPENDS (3),
.BR CURLOPT_STREAM_WEIGHT (3)