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Isolates fdtables/DashMap behavior in Lind-WASM from grate-specific logic (pipes, sockets, IPC). Intercepts open/close/dup/dup2/fork/exec with pure fdtables bookkeeping + forwarding. 11 C tests covering single-cage ops, rapid cycling, and cross-fork fd inheritance.
- Grate: removed all println output (only prints on errors) - Added 12 new tests (23 total) focused on fork/exec stress: - rapid fork+close (50 iterations) - child fd churn (open/dup/write/close loops after fork) - concurrent parent+child fd ops - fork chain (2 levels), deep fork chain (4 levels) - dup2 storm (in-process and post-fork) - fork bomb (20 sequential forks) - child closes all 15 inherited fds - multiple children from one parent (5 concurrent) - rapid double-fork (child immediately forks again, 10x) - concurrent opens from parent and child simultaneously
Runs before all other tests. Parent and child each write 500 times concurrently. Grate counts writes with three methods: - std::sync::Mutex - AtomicU64::fetch_add - unsynchronised load+store (control) Read from magic fd 99 reports all three counters. If mutex < 1000: Mutex doesn't work cross-thread. If atomic < 1000: atomics don't work cross-thread. If unsync == 1000: no real concurrency (single-threaded dispatch).
Init the child cage's fdtable with fds 0-2 in the preexec hook instead of lazily in each handler. Fork copies parent fdtable to child directly without checking existence first.
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