Section: Linux Programmer's Manual (2)Updated: 2008-06-26Local indexUp
sigreturn - return from signal handler and cleanup stack frame
int sigreturn(unsigned long __unused);
When the Linux kernel creates the stack frame for a signal handler, a
is inserted into the stack frame so that upon
return from the signal handler,
will be called.
call undoes everything that was
done---changing the process's signal mask, switching stacks (see
order to invoke the signal handler:
it restores the process's signal mask, switches stacks,
and restores the process's context (registers, processor flags),
so that the process directly resumes execution
at the point where it was interrupted by the signal.