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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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c, SPDX-License-Identifier, Title, Section, Source, See-also

SPDX-License-Identifier

Title

Section

Source

See-also

BSD-3-Clause

libssh2_sftp_init

libssh2

libssh2_session_init_ex(3)

libssh2_sftp_open_ex(3)

libssh2_sftp_shutdown(3)

NAME

libssh2_sftp_init - open SFTP channel for the given SSH session.

SYNOPSIS

#include <libssh2.h>
#include <libssh2_sftp.h>

LIBSSH2_SFTP *
libssh2_sftp_init(LIBSSH2_SESSION *session);

DESCRIPTION

session - Session instance as returned by libssh2_session_init_ex(3)

Open a channel and initialize the SFTP subsystem. Although the SFTP subsystem operates over the same type of channel as those exported by the Channel API, the protocol itself implements its own unique binary packet protocol which must be managed with the libssh2_sftp_*() family of functions. When an SFTP session is complete, it must be destroyed using the libssh2_sftp_shutdown(3) function.

RETURN VALUE

A pointer to the newly allocated SFTP instance or NULL on failure.

ERRORS

LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed.

LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.

LIBSSH2_ERROR_SOCKET_TIMEOUT -

LIBSSH2_ERROR_SFTP_PROTOCOL - An invalid SFTP protocol response was received on the socket, or an SFTP operation caused an errorcode to be returned by the server.

LIBSSH2_ERROR_EAGAIN - Marked for non-blocking I/O but the call would block.

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