Fix proc_close() signal exit code handling#21293

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alies-dev wants to merge 3 commits intophp:masterfrom

alies-dev:fix-proc-close-signal-exit-code

Commits on Feb 25, 2026

Fix proc_close() to return 128+signal when child is killed by signal
alies-dev
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Fix test: use SIGKILL via /bin/sh instead of posix_kill
alies-dev
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Commits on Feb 26, 2026

Add missing trailing newline in test file
alies-dev
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