Linux relation between signals and traps

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I have some concept questions regarding Linux/Unix traps and signals:

1) For each process there is a signals vector in its task_struct, however, one process can send a signal to another process. The question is: does sending a signal requires a wrapper function? since no process can gain access to other's context memory. In other words, does sending a signal needs a trap?

2) I need to understand how the CPU knows that there is a trap being created? and where does it(trap) been found?

Thanks for the help.

asked 46 secs ago

ThunderWiring

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Linux relation between signals and traps