#256: many writes, congested link -> LIBSSH2_ERROR_BAD_USE, stuck
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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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I am using libssh2 in an application that reads and writes many
small blocks (<200 bytes) on a connection that blocks frequently.
Occasionally a write returns LIBSSH2_ERROR_BAD_USE (-39). Once
this occurs, no subsequent write succeeds.
It turns out this happens when a window-adjust packet send() call
(e.g. during {{{libssh2_channel_read()}}}) returns a short write,
leaving {{{p->odata}}} pointing to the channel-adjust buffer.
Sending another window-adjust would unstick it, but
no code path provoked by normal code evokes that.
It could happen with keepalive packets too, although I have
not seen it yet.
The patch attached may be the right way to fix it.
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Ticket URL: <https://trac.libssh2.org/ticket/256>
libssh2 <https://trac.libssh2.org/>
C library for writing portable SSH2 clients
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