mirror of https://github.com/curl/curl.git synced 2024-12-09 06:30:06 +08:00

Daniel Stenberg eefcc1bda4

docs: introduce "curldown" for libcurl man page format

curldown is this new file format for libcurl man pages. It is markdown
inspired with differences:

- Each file has a set of leading headers with meta-data
- Supports a small subset of markdown
- Uses .md file extensions for editors/IDE/GitHub to treat them nicely
- Generates man pages very similar to the previous ones
- Generates man pages that still convert nicely to HTML on the website
- Detects and highlights mentions of curl symbols automatically (when
  their man page section is specified)

tools:

- cd2nroff: converts from curldown to nroff man page
- nroff2cd: convert an (old) nroff man page to curldown
- cdall: convert many nroff pages to curldown versions
- cd2cd: verifies and updates a curldown to latest curldown

This setup generates .3 versions of all the curldown versions at build time.

CI:

Since the documentation is now technically markdown in the eyes of many
things, the CI runs many more tests and checks on this documentation,
including proselint, link checkers and tests that make sure we capitalize the
first letter after a period...

Closes #12730

2024-01-23 00:29:02 +01:00

1.7 KiB

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SPDX-License-Identifier

Title

Section

Source

See-also

curl

CURLOPT_DNS_SHUFFLE_ADDRESSES

libcurl

CURLOPT_DNS_CACHE_TIMEOUT (3)

CURLOPT_IPRESOLVE (3)

NAME

CURLOPT_DNS_SHUFFLE_ADDRESSES - shuffle IP addresses for hostname

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SHUFFLE_ADDRESSES, long onoff);

DESCRIPTION

Pass a long set to 1 to enable this option.

When a name is resolved and more than one IP address is returned, this function shuffles the order of all returned addresses so that they are used in a random order. This is similar to the ordering behavior of the legacy gethostbyname function which is no longer used on most platforms.

Addresses are not reshuffled if name resolution is completed using the DNS cache. CURLOPT_DNS_CACHE_TIMEOUT(3) can be used together with this option to reduce DNS cache timeout or disable caching entirely if frequent reshuffling is needed.

Since the addresses returned are randomly reordered, the order is not in accordance with RFC 3484 or any other deterministic order that may be generated by the system's name resolution implementation. This may have performance impacts and may cause IPv4 to be used before IPv6 or vice versa.

DEFAULT

0 (disabled)

PROTOCOLS

All

EXAMPLE

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
    curl_easy_setopt(curl, CURLOPT_DNS_SHUFFLE_ADDRESSES, 1L);

    curl_easy_perform(curl);

    /* always cleanup */
    curl_easy_cleanup(curl);
  }
}

AVAILABILITY

Added in 7.60.0

RETURN VALUE

CURLE_OK or an error such as CURLE_UNKNOWN_OPTION.

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