SOCKFD_LOOKUP(9) Linux Networking SOCKFD_LOOKUP(9)NAME
sockfd_lookup - Go from a file number to its socket slot
SYNOPSIS
struct socket * sockfd_lookup(int fd, int * err);
ARGUMENTS
fd
file handle
err
pointer to an error code return
DESCRIPTION
The file handle passed in is locked and the socket it is bound too is returned. If an error occurs the err pointer is overwritten with a
negative errno code and NULL is returned. The function checks for both invalid handles and passing a handle which is not a socket.
On a success the socket object pointer is returned.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 SOCKFD_LOOKUP(9)
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curl_multi_assign(3) libcurl Manual curl_multi_assign(3)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)libcurl 7.16.0 9 Jul 2006 curl_multi_assign(3)
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