mirror of https://github.com/curl/curl.git synced 2025-01-24 14:15:18 +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

CURLOPT_UNIX_SOCKET_PATH

libcurl

CURLOPT_ABSTRACT_UNIX_SOCKET (3)

CURLOPT_OPENSOCKETFUNCTION (3)

unix (7)

NAME

CURLOPT_UNIX_SOCKET_PATH - Unix domain socket

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UNIX_SOCKET_PATH, char *path);

DESCRIPTION

Enables the use of Unix domain sockets as connection endpoint and sets the path to path. If path is NULL, then Unix domain sockets are disabled.

When enabled, curl connects to the Unix domain socket instead of establishing a TCP connection to the host. Since no network connection is created, curl does not resolve the DNS hostname in the URL.

The maximum path length on Cygwin, Linux and Solaris is 107. On other platforms it might be even less.

Proxy and TCP options such as CURLOPT_TCP_NODELAY(3) are not supported. Proxy options such as CURLOPT_PROXY(3) have no effect either as these are TCP-oriented, and asking a proxy server to connect to a certain Unix domain socket is not possible.

The application does not have to keep the string around after setting this option.

DEFAULT

Default is NULL, meaning that no Unix domain sockets are used.

PROTOCOLS

All protocols except for FILE and FTP are supported in theory. HTTP, IMAP, POP3 and SMTP should in particular work (including their SSL/TLS variants).

EXAMPLE

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_UNIX_SOCKET_PATH, "/tmp/httpd.sock");
    curl_easy_setopt(curl, CURLOPT_URL, "http://localhost/");

    curl_easy_perform(curl);
  }
}

If you are on Linux and somehow have a need for paths larger than 107 bytes, you can use the proc filesystem to bypass the limitation:

  int dirfd = open(long_directory_path_to_socket, O_DIRECTORY | O_RDONLY);
  char path[108];
  snprintf(path, sizeof(path), "/proc/self/fd/%d/httpd.sock", dirfd);
  curl_easy_setopt(curl_handle, CURLOPT_UNIX_SOCKET_PATH, path);
  /* Be sure to keep dirfd valid until you discard the handle */

AVAILABILITY

Added in 7.40.0.

RETURN VALUE

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

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