mirror of https://github.com/curl/curl.git synced 2024-12-03 06:20:31 +08:00

Daniel Stenberg e3fe020089

docs/libcurl: generate PROTOCOLS from meta-data

Remove the PROTOCOLS section from the source files completely and
instead generate them based on the header data in the curldown files.

It also generates TLS backend information for options marked for TLS as
protocol.

Closes #13175

2024-03-23 18:13:03 +01:00

1.8 KiB

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SPDX-License-Identifier

Title

Section

Source

See-also

Protocol

curl

curl_easy_duphandle

libcurl

curl_easy_cleanup (3)

curl_easy_init (3)

curl_easy_reset (3)

curl_global_init (3)

All

NAME

curl_easy_duphandle - Clone a libcurl session handle

SYNOPSIS

#include <curl/curl.h>

CURL *curl_easy_duphandle(CURL *handle);

DESCRIPTION

This function returns a new curl handle, a duplicate, using all the options previously set in the input curl handle. Both handles can subsequently be used independently and they must both be freed with curl_easy_cleanup(3).

Any options that the input handle has been told to point to (as opposed to copy) with previous calls to curl_easy_setopt(3), are pointed to by the new handle as well. You must therefore make sure to keep the data around until both handles have been cleaned up.

The new handle does not inherit any state information, no connections, no SSL sessions and no cookies. It also does not inherit any share object states or options (created as if CURLOPT_SHARE(3) was set to NULL).

If the source handle has HSTS or alt-svc enabled, the duplicate gets data read data from the main filename to populate the cache.

In multi-threaded programs, this function must be called in a synchronous way, the input handle may not be in use when cloned.

EXAMPLE

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    CURL *nother;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
    nother = curl_easy_duphandle(curl);
    res = curl_easy_perform(nother);
    curl_easy_cleanup(nother);
    curl_easy_cleanup(curl);
  }
}

AVAILABILITY

Added in 7.9

RETURN VALUE

If this function returns NULL, something went wrong and no valid handle was returned.

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