Annotation of embedaddon/curl/docs/libcurl/opts/CURLOPT_STREAM_DEPENDS_E.3, revision 1.1
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! 23: .TH CURLOPT_STREAM_DEPENDS_E 3 "March 23, 2020" "libcurl 7.70.0" "curl_easy_setopt options"
! 24:
! 25: .SH NAME
! 26: CURLOPT_STREAM_DEPENDS_E \- set stream this transfer depends on exclusively
! 27: .SH SYNOPSIS
! 28: #include <curl/curl.h>
! 29:
! 30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STREAM_DEPENDS_E, CURL *dephandle);
! 31: .SH DESCRIPTION
! 32: Pass a CURL * pointer in \fIdephandle\fP to identify the stream within the
! 33: same connection that this stream is depending upon exclusively. That means it
! 34: depends on it and sets the Exclusive bit.
! 35:
! 36: The spec says "Including a dependency expresses a preference to allocate
! 37: resources to the identified stream rather than to the dependent stream."
! 38:
! 39: Setting a dependency with the exclusive flag for a reprioritized stream causes
! 40: all the dependencies of the new parent stream to become dependent on the
! 41: reprioritized stream.
! 42:
! 43: This option can be set during transfer.
! 44:
! 45: \fIdephandle\fP must not be the same as \fIhandle\fP, that will cause this
! 46: function to return an error. It must be another easy handle, and it also needs
! 47: to be a handle of a transfer that will be sent over the same HTTP/2 connection
! 48: for this option to have an actual effect.
! 49: .SH DEFAULT
! 50: NULL
! 51: .SH PROTOCOLS
! 52: HTTP/2
! 53: .SH EXAMPLE
! 54: .nf
! 55: CURL *curl = curl_easy_init();
! 56: CURL *curl2 = curl_easy_init(); /* a second handle */
! 57: if(curl) {
! 58: curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/one");
! 59:
! 60: /* the second depends on the first */
! 61: curl_easy_setopt(curl2, CURLOPT_URL, "https://example.com/two");
! 62: curl_easy_setopt(curl2, CURLOPT_STREAM_DEPENDS_E, curl);
! 63:
! 64: /* then add both to a multi handle and transfer them! */
! 65: }
! 66: .fi
! 67: .SH AVAILABILITY
! 68: Added in 7.46.0
! 69: .SH RETURN VALUE
! 70: Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
! 71: .SH "SEE ALSO"
! 72: .BR CURLOPT_STREAM_WEIGHT "(3), " CURLOPT_STREAM_DEPENDS "(3), "
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