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libssh2/docs/libssh2_poll_channel_read.md
Viktor Szakats b889b39945 docs: convert man page sources to "curldown" format
To render in Git webviews as-is, to make it easier to edit, verify,
and to sync up with curl.

- add options to not build the `.3` man pages:
  - autotools: `--disable-docs`
  - cmake: `LIBSSH2_BUILD_DOCS=OFF`
- building `.3` man pages requires Perl after this patch.
- drop `mansyntax` and the shell / `grep` / GNU `man` tool requirements with it.
- scripts and most logic were copied from curl.
- add `cd2nroff` from curl, with edits to relax curl-specific checks.
- used `nroff2cd` (from curl) to convert from `.3` to `.md`. Then
  manually fixed copyrights, inline function references and a couple
  of other things.

Credits-to: Daniel Stenberg

Ref: eefcc1bda4
Ref: https://github.com/curl/curl/pull/12730
Ref: https://github.com/libssh2/www/issues/25#issuecomment-3289431671

Closes #1660
2025-10-09 04:05:38 +02:00

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Markdown

---
c: Copyright (C) The libssh2 project and its contributors.
SPDX-License-Identifier: BSD-3-Clause
Title: libssh2_poll_channel_read
Section: 3
Source: libssh2
See-also:
- libssh2_poll(3)
---
# NAME
libssh2_poll_channel_read - check if data is available
# SYNOPSIS
~~~c
#include <libssh2.h>
int
libssh2_poll_channel_read(LIBSSH2_CHANNEL *channel, int extended);
~~~
# DESCRIPTION
This function is deprecated. Do note use.
*libssh2_poll_channel_read(3)* checks to see if data is available in the
*channel*'s read buffer. No attempt is made with this method to see if
packets are available to be processed. For full polling support, use
*libssh2_poll(3)*.
# RETURN VALUE
Returns 1 when data is available and 0 otherwise.