asmlinkage int do_rt_sigreturn()

in kernel/signal.c [101:125]

• 18 lines of code
• 4 McCabe index (conditional complexity)

asmlinkage int do_rt_sigreturn(struct switch_stack *sw)
{
	struct pt_regs *regs = (struct pt_regs *)(sw + 1);
	/* Verify, can we follow the stack back */
	struct rt_sigframe *frame = (struct rt_sigframe *) regs->sp;
	sigset_t set;
	int rval;

	if (!access_ok(frame, sizeof(*frame)))
		goto badframe;

	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
		goto badframe;

	set_current_blocked(&set);

	if (rt_restore_ucontext(regs, sw, &frame->uc, &rval))
		goto badframe;

	return rval;

badframe:
	force_sig(SIGSEGV);
	return 0;
}