Call _exit(2) rather than exit(3) in forked child.
_exit(2) is async-signal-safe, whereas exit(3) is not.
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@ -26,7 +26,7 @@ TEST_BEGIN(test_fork)
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test_fail("Unexpected fork() failure");
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} else if (pid == 0) {
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/* Child. */
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exit(0);
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_exit(0);
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} else {
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int status;
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