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65 lines
2.3 KiB
Groff
65 lines
2.3 KiB
Groff
.\" generated by cd2nroff 0.1 from curl_multi_assign.md
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.TH curl_multi_assign 3 "2024-08-02" libcurl
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.SH NAME
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curl_multi_assign \- set data to associate with an internal socket
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLMcode curl_multi_assign(CURLM *multi_handle, curl_socket_t sockfd,
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void *sockptr);
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.fi
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.SH DESCRIPTION
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This function creates an association in the multi handle between the given
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socket and a private pointer of the application. This is designed for
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\fIcurl_multi_socket_action(3)\fP uses.
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When set, the \fIsockptr\fP pointer is passed to all future socket callbacks
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for the specific \fIsockfd\fP socket.
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If the given \fIsockfd\fP is not already in use by libcurl, this function
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returns an error.
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libcurl only keeps one single pointer associated with a socket, so calling
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this function several times for the same socket makes the last set pointer get
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used.
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The idea here being that this association (socket to private pointer) is
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something that just about every application that uses this API needs and then
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libcurl can just as well do it since it already has the necessary
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functionality.
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It is acceptable to call this function from your multi callback functions.
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.SH PROTOCOLS
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This functionality affects all supported protocols
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.SH EXAMPLE
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.nf
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int main(void)
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{
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CURLM *multi = curl_multi_init();
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void *ourstructp; /* pointer to our data */
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curl_socket_t fd; /* file descriptor to associate our data with */
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/* make our struct pointer associated with socket fd */
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CURLMcode mc = curl_multi_assign(multi, fd, ourstructp);
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if(mc)
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printf("error: %s\\n", curl_multi_strerror(mc));
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}
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.fi
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.SH TYPICAL USAGE
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In a typical application you allocate a struct or at least use some kind of
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semi\-dynamic data for each socket that we must wait for action on when using
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the \fIcurl_multi_socket_action(3)\fP approach.
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When our socket\-callback gets called by libcurl and we get to know about yet
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another socket to wait for, we can use \fIcurl_multi_assign(3)\fP to point out the
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particular data so that when we get updates about this same socket again, we
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do not have to find the struct associated with this socket by ourselves.
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.SH AVAILABILITY
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Added in curl 7.15.5
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.SH RETURN VALUE
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The standard CURLMcode for multi interface error codes.
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.SH SEE ALSO
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.BR curl_multi_setopt (3),
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.BR curl_multi_socket_action (3)
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