Not true. 

$ perl 815492.pl
Enter your password: You timed out.

[download]

Signals for which there is a handler will interrupt I/O operations (at the OS level) even under safe signals. readline returns (with errno = EINTR) as soon as the signal is received, allowing the signal handler to be called within milliseconds even under safe signals.

In reply to Re^2: $SIG{ALRM} and windows vista? by ikegami
in thread $SIG{ALRM} and windows vista? by 7stud

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