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libssh2/docs/libssh2_channel_open_ex.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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2.1 KiB
Markdown

---
c: Copyright (C) The libssh2 project and its contributors.
SPDX-License-Identifier: BSD-3-Clause
Title: libssh2_channel_open_ex
Section: 3
Source: libssh2
See-also:
- libssh2_channel_direct_tcpip(3)
- libssh2_channel_forward_listen(3)
- libssh2_channel_open_session(3)
- libssh2_session_init_ex(3)
---
# NAME
libssh2_channel_open_ex - establish a generic session channel
# SYNOPSIS
~~~c
#include <libssh2.h>
LIBSSH2_CHANNEL *
libssh2_channel_open_ex(LIBSSH2_SESSION *session, const char *channel_type,
unsigned int channel_type_len,
unsigned int window_size,
unsigned int packet_size,
const char *message, unsigned int message_len);
LIBSSH2_CHANNEL *
libssh2_channel_open_session(session);
~~~
# DESCRIPTION
*session* - Session instance as returned by libssh2_session_init_ex(3)
*channel_type* - Channel type to open. Typically one of session,
direct-tcpip, or tcpip-forward. The SSH2 protocol allowed for additional
types including local, custom channel types.
*channel_type_len* - Length of channel_type
*window_size* - Maximum amount of unacknowledged data remote host is
allowed to send before receiving an SSH_MSG_CHANNEL_WINDOW_ADJUST packet.
*packet_size* - Maximum number of bytes remote host is allowed to send
in a single SSH_MSG_CHANNEL_DATA or SSG_MSG_CHANNEL_EXTENDED_DATA packet.
*message* - Additional data as required by the selected channel_type.
*message_len* - Length of message parameter.
Allocate a new channel for exchanging data with the server. This method is
typically called through its macroized form:
*libssh2_channel_open_session(3)* or via *libssh2_channel_direct_tcpip(3)*
or *libssh2_channel_forward_listen(3)*
# RETURN VALUE
Pointer to a newly allocated LIBSSH2_CHANNEL instance, or NULL on errors.
# ERRORS
*LIBSSH2_ERROR_ALLOC* - An internal memory allocation call failed.
*LIBSSH2_ERROR_SOCKET_SEND* - Unable to send data on socket.
*LIBSSH2_ERROR_CHANNEL_FAILURE* -
*LIBSSH2_ERROR_EAGAIN* - Marked for non-blocking I/O but the call would block.
Add related functions