It doesn't kill the process, handled signals interrupt sleep. If they didn't, the handler wouldn't get to run. See Re: fork() doesn't care about my sleep()? for how to make sleep uninterruptible.

The OP didn't (visibly) use a sleep in the process that has a signal handler, so this isn't (likely to be) the OP's problem.

In reply to Re: INT signal kills process run with expect, when $SIG{'INT'} is set by ikegami
in thread INT signal kills process run with expect, when $SIG{'INT'} is set by ISAI student

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