static void handle_signal()

in kernel/signal.c [49:93]

• 37 lines of code
• 12 McCabe index (conditional complexity)

static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
{
	sigset_t *oldset = sigmask_to_save();
	int singlestep = 0;
	unsigned long sp;
	int err;

	if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
		singlestep = 1;

	/* Did we come from a system call? */
	if (PT_REGS_SYSCALL_NR(regs) >= 0) {
		/* If so, check system call restarting.. */
		switch (PT_REGS_SYSCALL_RET(regs)) {
		case -ERESTART_RESTARTBLOCK:
		case -ERESTARTNOHAND:
			PT_REGS_SYSCALL_RET(regs) = -EINTR;
			break;

		case -ERESTARTSYS:
			if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
				PT_REGS_SYSCALL_RET(regs) = -EINTR;
				break;
			}
			fallthrough;
		case -ERESTARTNOINTR:
			PT_REGS_RESTART_SYSCALL(regs);
			PT_REGS_ORIG_SYSCALL(regs) = PT_REGS_SYSCALL_NR(regs);
			break;
		}
	}

	sp = PT_REGS_SP(regs);
	if ((ksig->ka.sa.sa_flags & SA_ONSTACK) && (sas_ss_flags(sp) == 0))
		sp = current->sas_ss_sp + current->sas_ss_size;

#ifdef CONFIG_ARCH_HAS_SC_SIGNALS
	if (!(ksig->ka.sa.sa_flags & SA_SIGINFO))
		err = setup_signal_stack_sc(sp, ksig, regs, oldset);
	else
#endif
		err = setup_signal_stack_si(sp, ksig, regs, oldset);

	signal_setup_done(err, ksig, singlestep);
}