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1435
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1 Using read with a timeout does a longjmp() out of a signal handler, which leaves
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2 SIGARLM blocked. This is inherited by children, and thus not something you
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3 want to do from PID 1.
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4
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5 diff -ru bash/builtins/read.def bash.bak/builtins/read.def
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6 --- bash/builtins/read.def 2002-03-19 13:33:41.000000000 -0600
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7 +++ bash.bak/builtins/read.def 2011-09-07 23:11:56.853885092 -0500
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8 @@ -101,6 +101,11 @@
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9 sigalrm (s)
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10 int s;
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11 {
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12 + sigset_t walrus;
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13 +
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14 + sigemptyset(&walrus);
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15 + sigaddset(&walrus, SIGALRM);
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16 + sigprocmask(SIG_UNBLOCK, &walrus, 0);
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17 longjmp (alrmbuf, 1);
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18 }
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19
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