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libssh2/docs/libssh2_session_method_pref.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

1.5 KiB

c, SPDX-License-Identifier, Title, Section, Source, See-also
c SPDX-License-Identifier Title Section Source See-also
Copyright (C) The libssh2 project and its contributors. BSD-3-Clause libssh2_session_method_pref 3 libssh2
libssh2_session_handshake(3)
libssh2_session_init_ex(3)

NAME

libssh2_session_method_pref - set preferred key exchange method

SYNOPSIS

#include <libssh2.h>

int
libssh2_session_method_pref(LIBSSH2_SESSION *session,
                            int method_type, const char *prefs);

DESCRIPTION

session - Session instance as returned by libssh2_session_init_ex(3)

method_type - One of the Method Type constants.

prefs - Coma delimited list of preferred methods to use with the most preferred listed first and the least preferred listed last. If a method is listed which is not supported by libssh2 it will be ignored and not sent to the remote host during protocol negotiation.

Set preferred methods to be negotiated. These preferences must be set prior to calling libssh2_session_handshake(3) as they are used during the protocol initiation phase.

RETURN VALUE

Return 0 on success or negative on failure. It returns LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a negative number, it is not really a failure per se.

ERRORS

LIBSSH2_ERROR_INVAL - The requested method type was invalid.

LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed.

LIBSSH2_ERROR_METHOD_NOT_SUPPORTED - The requested method is not supported.