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

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SPDX-License-Identifier

Title

Section

Source

See-also

curl

curl_multi_assign

libcurl

curl_multi_setopt (3)

curl_multi_socket_action (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 is passed to all future socket callbacks for the specific sockfd socket.

If the given sockfd is not already in use by libcurl, this function returns an error.

libcurl only keeps one single pointer associated with a socket, so calling this function several times for the same socket makes 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 needs and then libcurl can just as well do it since it already has the necessary functionality.

It is acceptable to call this function from your multi callback functions.

EXAMPLE

int main(void)
{
  CURLM *multi = curl_multi_init();
  void *ourstructp; /* pointer to our data */
  curl_socket_t fd; /* file descriptor to associate our data with */

  /* make our struct pointer associated with socket fd */
  CURLMcode mc = curl_multi_assign(multi, fd, ourstructp);
  if(mc)
    printf("error: %s\n", curl_multi_strerror(mc));
}

AVAILABILITY

Added in 7.15.5

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 do not have to find the struct associated with this socket by ourselves.

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