fix(net): add packet polling to networking syscalls for first-call readiness #99
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The telnetd server was trying to exec /bin/init_shell but it wasn't in the ext2 filesystem, causing the shell to fail to start over telnet. Now ext2 contains: - /bin/init_shell (32KB) - interactive shell - /bin/telnetd (9KB) - telnet server Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
…adiness TCP listeners were not detecting pending connections on the first poll/select/accept call because incoming SYN packets remained unprocessed in the e1000 driver buffer. The fix ensures process_rx() and drain_loopback_queue() are called at syscall entry. Changes: - Add process_rx() + drain_loopback_queue() to sys_poll, sys_select, sys_accept, sys_recvfrom, and sys_read for TcpConnection - Add first-call accept test (Test 25) without retry loop - Add TCP listener poll test (Phase 8) verifying POLLIN on first call - Add TCP listener select test (Phase 8) verifying readiness on first call - Fix PTY master reference counting for fork/exec scenarios - Add telnetd to ext2 filesystem and update run.sh for interactive mode All 226 boot stages pass. Tests verify first-call success without retry loops, ensuring the fix actually works rather than masking timing issues. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
TCP connections now use reference counting similar to PTY: - Add refcount field to TcpConnection (AtomicUsize) - tcp_add_ref() increments count during fork - tcp_close() only sends FIN when last reference drops - FdTable::clone() calls tcp_add_ref() for TCP fds This fixes telnetd where the child closes inherited socket fds, which was prematurely closing the parent's connection. Also removes debug output: - TSS RSP0 updated messages from gdt.rs - tcp_add_ref/tcp_close debug logs from tcp.rs Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
Test plan
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