even though the $buffer is value-passed, rather than ref-passed.

That's hard to believe since Perl always passes arguments by reference, never by value. You seem to be confusing "passing by reference" and "passing a reference". @_ contains aliases to the values passed to the function (rather than the a copy of the values), so modifying elements of @_ modifies the parameters in the caller.

In reply to Re: How $clientSocket->recv( $buffer, $length) pass the data back by a value-passed? by ikegami
in thread How $clientSocket->recv( $buffer, $length) pass the data back by a value-passed? by sunshine_august

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