CURLINFO_LASTSOCKET explained
Name
CURLINFO_LASTSOCKET - get the last socket used
Synopsis
#include <curl/curl.h> CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_LASTSOCKET, long *socket);
Description
Deprecated since 7.45.0. Use CURLINFO_ACTIVESOCKET instead.
Pass a pointer to a long to receive the last socket used by this curl session. If the socket is no longer valid, -1 is returned. When you finish working with the socket, you must call curl_easy_cleanup as usual and let libcurl close the socket and cleanup other resources associated with the handle. This is typically used in combination with CURLOPT_CONNECT_ONLY.
NOTE: this API is deprecated since it is not working on win64 where the SOCKET type is 64 bits large while its 'long' is 32 bits. Use the CURLINFO_ACTIVESOCKET instead, if possible.
Protocols
This functionality affects all supported protocols
Example
int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode res; long sockfd; /* does not work on win64! */ curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); /* Do not do the transfer - only connect to host */ curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 1L); res = curl_easy_perform(curl); if(res != CURLE_OK) { printf("Error: %s\n", curl_easy_strerror(res)); curl_easy_cleanup(curl); return 1; } /* Extract the socket from the curl handle */ res = curl_easy_getinfo(curl, CURLINFO_LASTSOCKET, &sockfd); if(!res && sockfd != -1) { /* operate on sockfd */ } curl_easy_cleanup(curl); } }
Availability
Added in curl 7.15.2
Return value
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
See also
CURLINFO_ACTIVESOCKET(3), CURLOPT_CONNECT_ONLY(3), curl_easy_getinfo(3), curl_easy_setopt(3)
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