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April, 26th. 2006:
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curl_multi_assign
Section: libcurl Manual (3)
Updated: 9 Jul 2006
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NAME
curl_multi_assign - set data to association with an internal socket
SYNOPSIS
#include <curl/curl.h>
CURLMcode curl_multi_assign(CURLM *multi_handle, curl_socket_t sockfd,
void *sockptr);
DESCRIPTION
This function assigns an association in the multi handle between the given
socket and a private pointer of the application. This is (only) useful for
curl_multi_socket(3) uses.
When set, the sockptr pointer will be passed to all future socket
callbacks for the specific sockfd socket.
If the given sockfd isn't already in use by libcurl, this function will
return an error.
libcurl only keeps one single pointer associated with a socket, so calling
this function several times for the same socket will make the last set pointer
get used.
The idea here being that this association (socket to private pointer) is
something that just about every application that uses this API will need and
then libcurl can just as well do it since it already has an internal hash
table lookup for this.
RETURN VALUE
The standard CURLMcode for multi interface error codes.
TYPICAL USAGE
In a typical application you allocate a struct or at least use some kind of
semi-dynamic data for each socket that we must wait for action on when using
the curl_multi_socket(3) approach.
When our socket-callback gets called by libcurl and we get to know about yet
another socket to wait for, we can use curl_multi_assign(3) to point out
the particular data so that when we get updates about this same socket again,
we don't have to find the struct associated with this socket by ourselves.
AVAILABILITY
This function was added in libcurl 7.15.5, although not deemed stable yet.
SEE ALSO
curl_multi_setopt(3), curl_multi_socket(3)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- TYPICAL USAGE
-
- AVAILABILITY
-
- SEE ALSO
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