How to determine network interface that will be used to send a packet

Hello,
I'm writing to you because I encountered the following problem. My program displayes all network interfaces that are available in the system, but I would like to add a functionality in which a user can enter a destination address IP (ex. the IP address of the Google search engine) and will get information which network interface will be used to send it. As I know it is associated with reading information from routing table in the system. Maybe you know the API (functions/methods) which I could use to do it in Solaris ? I program in C/C++, but if you know how to do it in other programming languages (Java, Perl, Python) I will be grateful for any information.
Thank you for any help, tips and suggestions.
Best regards,
Foxrafi

Thank you for your response it was very helpful :).
I went to the OpenSolaris webpage because I would like to find the code of this command, but unfortunately I don't know where I should start my searches.
There is a page with source code of basic commands, but there is no "route" command: here .
Maybe you are better enlightened where I should start.
Thank you for answer.
Foxrafi

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How to determine network interface that will be used to send a packet

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