asmlinkage int sys_rt_sigreturn()

in kernel/signal.c [224:257]

• 23 lines of code
• 5 McCabe index (conditional complexity)

asmlinkage int sys_rt_sigreturn(void)
{
	struct pt_regs *regs = current_pt_regs();
	struct rt_sigframe __user *frame;
	sigset_t blocked;

	/* Always make any pending restarted system calls return -EINTR */
	current->restart_block.fn = do_no_restart_syscall;

	frame = (struct rt_sigframe __user *)pt_psp(regs);
	if (!access_ok(frame, sizeof(*frame)))
		goto badframe;
	if (__copy_from_user(&blocked, &frame->uc.uc_sigmask, sizeof(blocked)))
		goto badframe;

	set_current_blocked(&blocked);

	if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
		goto badframe;

	/* Restore the user's stack as well */
	pt_psp(regs) = regs->r29;

	regs->syscall_nr = -1;

	if (restore_altstack(&frame->uc.uc_stack))
		goto badframe;

	return regs->r00;

badframe:
	force_sig(SIGSEGV);
	return 0;
}