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Fix signal #7044

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Fix signal #7044

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6 changes: 6 additions & 0 deletions crates/vm/src/stdlib/signal.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -373,6 +373,12 @@ pub(crate) mod _signal {
let fd = args.fd;

if vm.signal_handlers.is_none() {
// In non-main threads or in fork children where signal_handlers is not
// set up, set_wakeup_fd(-1) should still succeed (no-op, return -1).
// Other fd values should fail since we can't actually configure wakeup.
if fd == INVALID_WAKEUP {
return Ok(-1);
}
return Err(vm.new_value_error("signal only works in main thread"));
}

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