Do signal handers have a separate stack?

问题:

Do signal handlers have a separate stack, (like each thread have separate stacks)?

This is in Linux/C context.

回答1:

From the Linux manual page signal(7):

By default, the signal handler is invoked on the normal process stack.
It is possible to arrange that the signal handler uses an alternate stack;
see sigaltstack(2) for a discussion of how to do this and when it might
be useful.