#255: libssh2_channel_write_ex returns zero
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Reporter: ncm | Owner:
Type: defect | Status: new
Priority: normal | Milestone: 1.4.3
Component: misc | Version: 1.4.2
Keywords: | Blocked By:
Blocks: |
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Sometimes {{{libssh2_channel_write_ex()}}} returns zero when writing from
a
non-zero-length buffer. As I understand it, this should never happen:
it should either return a positive number of bytes written, or a negative
value such as {{{_EAGAIN}}}.
The zero may be coming from {{{src/channel.c}}},
{{{_libssh2_channel_write()}}}, c. line 2015, when rc is zero:
{{{
if(channel->local.window_size <= 0)
/* there's no room for data so we stop */
return (rc==LIBSSH2_ERROR_EAGAIN?rc:0);
}}}
{{{rc}}} gets its value from {{{_libssh2_transport_read()}}}, which
returns zero
when {{{session->socket_state}}} is {{{LIBSSH2_SOCKET_DISCONNECTED}}}. I
have not
discovered any other way for {{{_transport_read()}}} to return zero.
Another way for {{{_write_ex()}}} to return zero would be if
{{{channel->local.packet_size}}} were to be set to zero.
Also, it seems as if {{{session->socket_block_directions}}} should
be assigned {{{LIBSSH2_SESSION_BLOCK_INBOUND}}} when
{{{channel->local.window_size}}} is found to be zero, but it is not.
--
Ticket URL: <https://trac.libssh2.org/ticket/255>
libssh2 <https://trac.libssh2.org/>
C library for writing portable SSH2 clients
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