fseek() — internals

fseek() — internals

Where it lives

• Signature: src/builtins/io/fseek.rs
• Lowering: src/codegen/lower_inst/builtins/io.rs:3168 (lower_fseek)
• Function symbol: lower_fseek()

Lowering notes

• Lowers fseek(stream, offset, whence?) and clears EOF state on success.

Runtime helpers

No direct __rt_* helpers captured — the lowering is inlined or routes through another builtin.

Signature summary

function fseek(resource $stream, int $offset, int $whence = 0): int

What the type checker enforces

• Arity: takes 2–3 arguments (1 optional).

Eval interpreter (magician)

• Declaration: crates/elephc-magician/src/interpreter/builtins/filesystem/fseek.rs (eval_builtin!)
• Dispatch hooks: direct, values

Cross-references

• User reference for fseek()