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curl_getenv(3) [osx man page]

curl_getenv(3)							  libcurl Manual						    curl_getenv(3)

NAME
curl_getenv - return value for environment name SYNOPSIS
#include <curl/curl.h> char *curl_getenv(const char *name); DESCRIPTION
curl_getenv() is a portable wrapper for the getenv() function, meant to emulate its behaviour and provide an identical interface for all operating systems libcurl builds on (including win32). AVAILABILITY
This function will be removed from the public libcurl API in a near future. It will instead be made "available" by source code access only, and then as curlx_getenv(). RETURN VALUE
If successful, curl_getenv() returns a pointer to the value of the specified environment. The memory it refers to is malloc()ed so the application must free() this when the data is no longer needed. When curl_getenv(3) fails to find the specified name, it returns a null pointer. NOTE
Under unix operating systems, there isn't any point in returning an allocated memory, although other systems won't work properly if this isn't done. The unix implementation thus has to suffer slightly from the drawbacks of other systems. SEE ALSO
getenv(3C), libcurl 7.12 30 April 2004 curl_getenv(3)

Check Out this Related Man Page

curl_multi_assign(3)						  libcurl Manual					      curl_multi_assign(3)

NAME
curl_multi_assign - set data to associate 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 creates an association in the multi handle between the given socket and a private pointer of the application. This is designed for curl_multi_socket_action(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_action(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. SEE ALSO
curl_multi_setopt(3), curl_multi_socket_action(3) libcurl 7.54.0 February 03, 2016 curl_multi_assign(3)
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