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_read_ex

libssh2

libssh2_poll_channel_read(3)

NAME

libssh2_channel_read_ex - read data from a channel stream

SYNOPSIS

#include <libssh2.h>

ssize_t
libssh2_channel_read_ex(LIBSSH2_CHANNEL *channel, int stream_id,
                        char *buf, size_t buflen);

ssize_t
libssh2_channel_read(LIBSSH2_CHANNEL *channel,
                     char *buf, size_t buflen);

ssize_t
libssh2_channel_read_stderr(LIBSSH2_CHANNEL *channel,
                            char *buf, size_t buflen);

DESCRIPTION

Attempt to read data from an active 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 read from.

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

buf - pointer to storage buffer to read data into

buflen - size of the buf storage

libssh2_channel_read(3) and libssh2_channel_read_stderr(3) are macros.

RETURN VALUE

Actual number of bytes read 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.

Note that a return value of zero (0) can in fact be a legitimate value and only signals that no payload data was read. It is not an error.

ERRORS

LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.

LIBSSH2_ERROR_CHANNEL_CLOSED - The channel has been closed.

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