Block all signals in the parent before fork - #51
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Block all signals on the spawning thread before fork, so that the child process setup (descriptor wiring, close-on-exec sweep, chdir) cannot be interrupted by signals (so no call can fail with EINTR). This is hardening: previously, the child's setup was safe only as long as neither the VM nor native code loaded into the process installed disruptive signal handlers. Blocking makes the setup safe by construction.
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Block all signals on the spawning thread before fork, so that the child process setup (descriptor wiring, close-on-exec sweep, chdir) cannot be interrupted by signals (so no call can fail with EINTR).
This is hardening: previously, the child's setup was safe only as long as neither the VM nor native code loaded into the process installed disruptive signal handlers. Blocking makes the setup safe by construction.