mirror of https://github.com/libssh2/libssh2.git synced 2025-10-24 14:53:03 +03:00

Files

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_channel_write_ex

libssh2

libssh2_channel_open_ex(3)

libssh2_channel_read_ex(3)

NAME

libssh2_channel_write_ex - write data to a channel stream blocking

SYNOPSIS

#include <libssh2.h>

ssize_t
libssh2_channel_write_ex(LIBSSH2_CHANNEL *channel,
                         int stream_id, char *buf,
                         size_t buflen);

DESCRIPTION

Write data to a channel stream. All channel streams have one standard I/O substream (stream_id == 0), and may have up to 2^32 extended data streams as identified by the selected stream_id. The SSH2 protocol currently defines a stream ID of 1 to be the stderr substream.

channel - active channel stream to write to.

stream_id - substream ID number (e.g. 0 or SSH_EXTENDED_DATA_STDERR)

buf - pointer to buffer to write

buflen - size of the data to write

libssh2_channel_write(3) and libssh2_channel_write_stderr(3) are convenience macros for this function.

libssh2_channel_write_ex(3) will use as much as possible of the buffer and put it into a single SSH protocol packet. This means that to get maximum performance when sending larger files, you should try to always pass in at least 32K of data to this function.

RETURN VALUE

Actual number of bytes written or negative on failure. 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_ALLOC - An internal memory allocation call failed.

LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.

LIBSSH2_ERROR_CHANNEL_CLOSED - The channel has been closed.

LIBSSH2_ERROR_CHANNEL_EOF_SENT - The channel has been requested to be

LIBSSH2_ERROR_BAD_USE - This can be returned if you ignored a previous return for LIBSSH2_ERROR_EAGAIN and rather than sending the original buffer with the original size, you sent a new buffer with a different size.

closed.

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