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eefcc1bda4
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
77 lines
1.6 KiB
Markdown
77 lines
1.6 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_READDATA
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_HEADERDATA (3)
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- CURLOPT_READFUNCTION (3)
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- CURLOPT_WRITEDATA (3)
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- CURLOPT_WRITEFUNCTION (3)
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---
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# NAME
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CURLOPT_READDATA - pointer passed to the read callback
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_READDATA, void *pointer);
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~~~
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# DESCRIPTION
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Data *pointer* to pass to the file read function. If you use the
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CURLOPT_READFUNCTION(3) option, this is the pointer you get as input in
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the fourth argument to the callback.
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If you do not specify a read callback but instead rely on the default internal
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read function, this data must be a valid readable FILE * (cast to 'void *').
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If you are using libcurl as a DLL on Windows, you must use the
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CURLOPT_READFUNCTION(3) callback if you set this option, otherwise you
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might experience crashes.
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# DEFAULT
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By default, this is a FILE * to stdin.
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# PROTOCOLS
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This is used for all protocols when sending data.
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# EXAMPLE
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~~~c
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struct MyData {
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void *custom;
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};
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int main(void)
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{
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CURL *curl = curl_easy_init();
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struct MyData this;
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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/* pass pointer that gets passed in to the
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CURLOPT_READFUNCTION callback */
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curl_easy_setopt(curl, CURLOPT_READDATA, &this);
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curl_easy_perform(curl);
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}
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}
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~~~
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# AVAILABILITY
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This option was once known by the older name CURLOPT_INFILE, the name
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CURLOPT_READDATA(3) was introduced in 7.9.7.
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# RETURN VALUE
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This returns CURLE_OK.
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