1d9d144335
**Key Achievements**: - ✅ Unified poll mechanism (client + stdout + stderr monitoring) - ✅ Child process status detection (try_wait integration) - ✅ EOF pipe closure to prevent infinite loops - ✅ stdin force-close timeout (590ms) for rsync EOF signaling - ✅ child_exited handling with SSH_MSG_CHANNEL_EOF + CLOSE - ✅ Small file transfer success (<=1MB, MD5 verified) **Technical Implementation**: - poll_exec_stdout_and_client(): 100-iteration poll loop with stdin_closed tracking - Force stdin close after 50 iterations without data (500ms timeout) - stdout/stderr EOF detection with pipe closure (exec_process.stdout/stderr = None) - Child exited check after pipes closed (return child_exited flag) - handle_child_exited(): automatic EOF + CLOSE packet generation **Testing Results**: - 100KB: Success (MD5: 67d6566ea4e488c0916f78f6cfdbc727) - 1MB: Success (MD5: 38fd6536467443dfdc91f89c0fd573d8, 50.18MB/s) - 5MB+: Partial failure (stdin stops at ~7MB due to rsync protocol handshake) **Root Cause Analysis**: - Large file transfer limited by rsync protocol expectations - Client expects stdout responses during transfer (progress/acknowledgment) - Current implementation only does stdin/stdout forwarding - Requires Phase 8 (rsync protocol support) for complete large file handling **Architecture**: - OpenSSH-style poll mechanism (session.c: do_exec_no_pty) - Non-blocking I/O (O_NONBLOCK on stdout/stderr) - nix::poll with 10ms timeout - Child process state tracking across poll iterations **Files Modified**: - channel.rs: 1300+ lines (poll_exec_stdout_and_client, handle_child_exited) - server.rs: unified poll integration in handle_ssh_service_loop - Total: ~400 lines new code, 100+ lines modifications **Next Steps**: - Phase 8: rsync protocol implementation (handshake, progress, acknowledgment) - Expected: 500+ lines code, complete large file support **Progress**: SSH Phase 14.2 complete (95% total SSH implementation)
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