In Perl, signals no longer interrupt opcodes, except for Perl IO operations. Perl checks if a signal was received between executing opcodes. Net:SSH2 is a wrapper for C library libssh2. libssh2 doesn't know anything about Perl. All the IO is done using C IO, not Perl IO, so alarm will not interrupt Net::SSH2 while it waits for libssh2 to return data.

The reason for this change (and how to switch to the dangerous old system) is documented in Deferred Signals in perlipc.

In reply to Re: eval problem by ikegami
in thread eval problem by muad33b

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