C++ sigorsets函数代码示例

int ckpt_restore_sigpending(struct sigpending *sigpending, int shared, ckpt_desc_t desc)
{
    int i;
    ckpt_sigqueue_t queue;
    ckpt_sigpending_t pending;
    struct siginfo *info = &queue.info;

    if (ckpt_read(desc, &pending, sizeof(ckpt_sigpending_t)) != sizeof(ckpt_sigpending_t)) {
        log_err("failed to get sigpending");
        return -EIO;
    }

    for (i = 0; i < pending.count; i++) {
        if (ckpt_read(desc, &queue, sizeof(ckpt_sigqueue_t)) != sizeof(ckpt_sigqueue_t)) {
            log_err("failed to get sigqueue");
            return -EIO;
        }

        if (shared) {
            read_lock((rwlock_t *)TASKLIST_LOCK);
            group_send_sig_info(info->si_signo, info, current);
            read_unlock((rwlock_t *)TASKLIST_LOCK);
        } else
            send_sig_info(info->si_signo, info, current);
    }

    spin_lock_irq(&current->sighand->siglock);
    sigorsets(&sigpending->signal, &sigpending->signal, &pending.signal);
    recalc_sigpending();
    spin_unlock_irq(&current->sighand->siglock);
    return 0;
}

/*
 * OK, we're invoking a handler
 */
static int
handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
	      sigset_t *oldset, struct pt_regs *regs)
{
	int ret;

	/* are we from a system call? to see pt_regs->orig_p0 */
	if (regs->orig_p0 >= 0)
		/* If so, check system call restarting.. */
		handle_restart(regs, ka, 1);

	/* set up the stack frame */
	ret = setup_rt_frame(sig, ka, info, oldset, regs);

	if (ret == 0) {
		spin_lock_irq(&current->sighand->siglock);
		sigorsets(&current->blocked, &current->blocked,
			  &ka->sa.sa_mask);
		if (!(ka->sa.sa_flags & SA_NODEFER))
			sigaddset(&current->blocked, sig);
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}
	return ret;
}

/*
 * OK, we're invoking a handler
 */
static void
handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
	      sigset_t *oldset, struct pt_regs *regs)
{
	/* are we from a system call? */
	if (regs->orig_er0 >= 0)
		/* If so, check system call restarting.. */
		handle_restart(regs, ka, 1);

	/* set up the stack frame */
	if (ka->sa.sa_flags & SA_SIGINFO)
		setup_rt_frame(sig, ka, info, oldset, regs);
	else
		setup_frame(sig, ka, oldset, regs);

	if (ka->sa.sa_flags & SA_ONESHOT)
		ka->sa.sa_handler = SIG_DFL;

	if (!(ka->sa.sa_flags & SA_NODEFER)) {
		spin_lock_irq(&current->sighand->siglock);
		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
		sigaddset(&current->blocked,sig);
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}
}

static inline void handle_signal(unsigned long sig, siginfo_t *info,
	struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs)
{
	switch(regs->regs[0]) {
	case ERESTARTNOHAND:
		regs->regs[2] = EINTR;
		break;
	case ERESTARTSYS:
		if(!(ka->sa.sa_flags & SA_RESTART)) {
			regs->regs[2] = EINTR;
			break;
		}
	/* fallthrough */
	case ERESTARTNOINTR:		/* Userland will reload $v0.  */
		regs->cp0_epc -= 8;
	}

	regs->regs[0] = 0;		/* Don't deal with this again.  */

	if (ka->sa.sa_flags & SA_SIGINFO)
		setup_irix_rt_frame(ka, regs, sig, oldset, info);
	else
		setup_irix_frame(ka, regs, sig, oldset);

	if (!(ka->sa.sa_flags & SA_NODEFER)) {
		spin_lock_irq(&current->sighand->siglock);
		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
		sigaddset(&current->blocked,sig);
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}
}

static long
handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *oldset,
	       struct sigscratch *scr)
{
	if (IS_IA32_PROCESS(&scr->pt)) {
		/* send signal to IA-32 process */
		if (!ia32_setup_frame1(sig, ka, info, oldset, &scr->pt))
			return 0;
	} else
		/* send signal to IA-64 process */
		if (!setup_frame(sig, ka, info, oldset, scr))
			return 0;

	if (ka->sa.sa_flags & SA_ONESHOT)
		ka->sa.sa_handler = SIG_DFL;

	if (!(ka->sa.sa_flags & SA_NODEFER)) {
		spin_lock_irq(&current->sighand->siglock);
		{
			sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
			sigaddset(&current->blocked, sig);
			recalc_sigpending();
		}
		spin_unlock_irq(&current->sighand->siglock);
	}
	return 1;
}

static inline int
handle_signal(unsigned long signr, struct k_sigaction *ka,
	      siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
{
	int err;

	if (ka->sa.sa_flags & SA_SIGINFO)
		err = setup_rt_frame(ka, regs, signr, oldset, info);
	else
		err = setup_frame(ka, regs, signr, oldset);

	if (err)
		return err;

	spin_lock_irq(&current->sighand->siglock);
	sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
	if (!(ka->sa.sa_flags & SA_NOMASK))
		sigaddset(&current->blocked, signr);
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	tracehook_signal_handler(signr, info, ka, regs, 0);

	return 0;
}

/*
 * OK, we're invoking a handler
 */
static int
handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
	      sigset_t *oldset, struct pt_regs *regs, unsigned int save_r0)
{
	int ret;

	/* Set up the stack frame */
	if (ka->sa.sa_flags & SA_SIGINFO)
		ret = setup_rt_frame(sig, ka, info, oldset, regs);
	else
		ret = setup_frame(sig, ka, oldset, regs);

	if (ka->sa.sa_flags & SA_ONESHOT)
		ka->sa.sa_handler = SIG_DFL;

	if (ret == 0) {
		spin_lock_irq(&current->sighand->siglock);
		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
		if (!(ka->sa.sa_flags & SA_NODEFER))
			sigaddset(&current->blocked,sig);
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}

	return ret;
}

static inline void
handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
	      sigset_t *oldset, struct pt_regs *regs, int syscall)
{
	int ret;

	/*
	 * Set up the stack frame
	 */
	ret = setup_rt_frame(sig, ka, info, oldset, regs);

	/*
	 * Check that the resulting registers are sane
	 */
	ret |= !valid_user_regs(regs);

	/*
	 * Block the signal if we were unsuccessful.
	 */
	if (ret != 0 || !(ka->sa.sa_flags & SA_NODEFER)) {
		spin_lock_irq(&current->sighand->siglock);
		sigorsets(&current->blocked, &current->blocked,
			  &ka->sa.sa_mask);
		sigaddset(&current->blocked, sig);
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}

	if (ret == 0)
		return;

	force_sigsegv(sig, current);
}

static void
handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
	      sigset_t *oldset, struct pt_regs *regs)
{
	/* Are we from a system call? */
	if (regs->tra >= 0) {
		/* If so, check system call restarting.. */
		switch (regs->regs[0]) {
			case -ERESTARTNOHAND:
				regs->regs[0] = -EINTR;
				break;

			case -ERESTARTSYS:
				if (!(ka->sa.sa_flags & SA_RESTART)) {
					regs->regs[0] = -EINTR;
					break;
				}
			/* fallthrough */
			case -ERESTARTNOINTR:
				regs->pc -= 2;
		}
	} else {
		/* gUSA handling */
#ifdef CONFIG_PREEMPT
		unsigned long flags;

		local_irq_save(flags);
#endif
		if (regs->regs[15] >= 0xc0000000) {
			int offset = (int)regs->regs[15];

			/* Reset stack pointer: clear critical region mark */
			regs->regs[15] = regs->regs[1];
			if (regs->pc < regs->regs[0])
				/* Go to rewind point #1 */
				regs->pc = regs->regs[0] + offset - 2;
		}
#ifdef CONFIG_PREEMPT
		local_irq_restore(flags);
#endif
	}

	/* Set up the stack frame */
	if (ka->sa.sa_flags & SA_SIGINFO)
		setup_rt_frame(sig, ka, info, oldset, regs);
	else
		setup_frame(sig, ka, oldset, regs);

	if (ka->sa.sa_flags & SA_ONESHOT)
		ka->sa.sa_handler = SIG_DFL;

	if (!(ka->sa.sa_flags & SA_NODEFER)) {
		spin_lock_irq(&current->sighand->siglock);
		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
		sigaddset(&current->blocked,sig);
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}
}

static int
handle_signal(unsigned long sig, struct k_sigaction *ka,
	      siginfo_t *info, sigset_t *oldset,
	      struct pt_regs * regs, int syscall)
{
	struct thread_info *thread = current_thread_info();
	struct task_struct *tsk = current;
	int usig = sig;
	int ret;

	
	if (syscall) {
		switch (regs->ARM_r0) {
		case -ERESTART_RESTARTBLOCK:
		case -ERESTARTNOHAND:
			regs->ARM_r0 = -EINTR;
			break;
		case -ERESTARTSYS:
			if (!(ka->sa.sa_flags & SA_RESTART)) {
				regs->ARM_r0 = -EINTR;
				break;
			}
			
		case -ERESTARTNOINTR:
			setup_syscall_restart(regs);
		}
	}

	
	if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap)
		usig = thread->exec_domain->signal_invmap[usig];

	
	if (ka->sa.sa_flags & SA_SIGINFO)
		ret = setup_rt_frame(usig, ka, info, oldset, regs);
	else
		ret = setup_frame(usig, ka, oldset, regs);

	
	ret |= !valid_user_regs(regs);

	if (ret != 0) {
		force_sigsegv(sig, tsk);
		return ret;
	}

	
	spin_lock_irq(&tsk->sighand->siglock);
	sigorsets(&tsk->blocked, &tsk->blocked,
		  &ka->sa.sa_mask);
	if (!(ka->sa.sa_flags & SA_NODEFER))
		sigaddset(&tsk->blocked, sig);
	recalc_sigpending();
	spin_unlock_irq(&tsk->sighand->siglock);

	return 0;
}

static int
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
	      sigset_t *oldset,	struct pt_regs * regs)
{
	int ret;

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

			case -ERESTARTSYS:
				if (!(ka->sa.sa_flags & SA_RESTART)) {
					regs->eax = -EINTR;
					break;
				}
			/* fallthrough */
			case -ERESTARTNOINTR:
				regs->eax = regs->orig_eax;
				regs->eip -= 2;
		}
	}

	/*
	 * If TF is set due to a debugger (PT_DTRACE), clear the TF flag so
	 * that register information in the sigcontext is correct.
	 */
	if (unlikely(regs->eflags & TF_MASK)
	    && likely(current->ptrace & PT_DTRACE)) {
		current->ptrace &= ~PT_DTRACE;
		regs->eflags &= ~TF_MASK;
	}

	/* Set up the stack frame */
	if (ka->sa.sa_flags & SA_SIGINFO)
		ret = setup_rt_frame(sig, ka, info, oldset, regs);
	else
		ret = setup_frame(sig, ka, oldset, regs);

	if (ret == 0) {
		spin_lock_irq(&current->sighand->siglock);
		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
		if (!(ka->sa.sa_flags & SA_NODEFER))
			sigaddset(&current->blocked,sig);
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}

	return ret;
}

/*
 * Note that 'init' is a special process: it doesn't get signals it doesn't
 * want to handle. Thus you cannot kill init even with a SIGKILL even by
 * mistake.
 *
 * Note that we go through the signals twice: once to check the signals that
 * the kernel can handle, and then we build all the user-level signal handling
 * stack-frames in one go after that.
 */
int do_signal(struct pt_regs *regs, sigset_t *oldset)
{
	siginfo_t info;
	int signr;
	struct k_sigaction ka;

	if (!oldset)
		oldset = &current->blocked;

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);

	/* Are we from a system call? */
	if (regs->syscall >= 0) {
		/* If so, check system call restarting.. */
		switch (regs->areg[2]) {
			case ERESTARTNOHAND:
			case ERESTART_RESTARTBLOCK:
				regs->areg[2] = -EINTR;
				break;

			case ERESTARTSYS:
				if (!(ka.sa.sa_flags & SA_RESTART)) {
					regs->areg[2] = -EINTR;
					break;
				}
			/* fallthrough */
			case ERESTARTNOINTR:
				regs->areg[2] = regs->syscall;
				regs->pc -= 3;
		}
	}

	if (signr == 0)
		return 0;		/* no signals delivered */

	/* Whee!  Actually deliver the signal.  */

	/* Set up the stack frame */
	if (ka.sa.sa_flags & SA_SIGINFO)
		setup_rt_frame(signr, &ka, &info, oldset, regs);
	else
		setup_frame(signr, &ka, oldset, regs);

	if (ka.sa.sa_flags & SA_ONESHOT)
		ka.sa.sa_handler = SIG_DFL;

	spin_lock_irq(&current->sighand->siglock);
	sigorsets(&current->blocked, &current->blocked, &ka.sa.sa_mask);
	if (!(ka.sa.sa_flags & SA_NODEFER))
		sigaddset(&current->blocked, signr);
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);
	return 1;
}

static int handle_signal(unsigned long sig, siginfo_t *info,
			 struct k_sigaction *ka, sigset_t *oldset,
			 struct pt_regs *regs)
{
	int ret;


	/* Are we from a system call? */
	if (regs->faultnum == INT_SWINT_1) {
		/* If so, check system call restarting.. */
		switch (regs->regs[0]) {
		case -ERESTART_RESTARTBLOCK:
		case -ERESTARTNOHAND:
			regs->regs[0] = -EINTR;
			break;

		case -ERESTARTSYS:
			if (!(ka->sa.sa_flags & SA_RESTART)) {
				regs->regs[0] = -EINTR;
				break;
			}
			/* fallthrough */
		case -ERESTARTNOINTR:
			/* Reload caller-saves to restore r0..r5 and r10. */
			regs->flags |= PT_FLAGS_CALLER_SAVES;
			regs->regs[0] = regs->orig_r0;
			regs->pc -= 8;
		}
	}

	/* Set up the stack frame */
#ifdef CONFIG_COMPAT
	if (is_compat_task())
		ret = compat_setup_rt_frame(sig, ka, info, oldset, regs);
	else
#endif
		ret = setup_rt_frame(sig, ka, info, oldset, regs);
	if (ret == 0) {
		/* This code is only called from system calls or from
		 * the work_pending path in the return-to-user code, and
		 * either way we can re-enable interrupts unconditionally.
		 */
		spin_lock_irq(&current->sighand->siglock);
		sigorsets(&current->blocked,
			  &current->blocked, &ka->sa.sa_mask);
		if (!(ka->sa.sa_flags & SA_NODEFER))
			sigaddset(&current->blocked, sig);
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}

	return ret;
}

/*
 * Setup invocation of signal handler
 */
static int handle_signal(int sig, siginfo_t *info, struct k_sigaction *ka,
			 sigset_t *oldset, struct pt_regs *regs)
{
	int rc;

	/*
	 * If we're handling a signal that aborted a system call,
	 * set up the error return value before adding the signal
	 * frame to the stack.
	 */

	if (regs->syscall_nr >= 0) {
		switch (regs->r00) {
		case -ERESTART_RESTARTBLOCK:
		case -ERESTARTNOHAND:
			regs->r00 = -EINTR;
			break;
		case -ERESTARTSYS:
			if (!(ka->sa.sa_flags & SA_RESTART)) {
				regs->r00 = -EINTR;
				break;
			}
			/* Fall through */
		case -ERESTARTNOINTR:
			regs->r06 = regs->syscall_nr;
			pt_set_elr(regs, pt_elr(regs) - 4);
			regs->r00 = regs->restart_r0;
			break;
		default:
			break;
		}
	}

	/*
	 * Set up the stack frame; not doing the SA_SIGINFO thing.  We
	 * only set up the rt_frame flavor.
	 */
	rc = setup_rt_frame(sig, ka, info, oldset, regs);

	/* If there was an error on setup, no signal was delivered. */
	if (rc)
		return rc;

	spin_lock_irq(&current->sighand->siglock);
	sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
	if (!(ka->sa.sa_flags & SA_NODEFER))
		sigaddset(&current->blocked, sig);
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	return 0;
}

static inline int handle_signal(int canrestart, unsigned long sig,
	siginfo_t *info, struct k_sigaction *ka,
	struct pt_regs *regs)
{
	sigset_t *oldset = sigmask_to_save();
	int ret;

	/* Are we from a system call? */
	if (canrestart) {
		/* If so, check system call restarting.. */
		switch (regs->r10) {
		case -ERESTART_RESTARTBLOCK:
		case -ERESTARTNOHAND:
			/* ERESTARTNOHAND means that the syscall should
			 * only be restarted if there was no handler for
			 * the signal, and since we only get here if there
			 * is a handler, we don't restart */
			regs->r10 = -EINTR;
			break;
		case -ERESTARTSYS:
			/* ERESTARTSYS means to restart the syscall if
			 * there is no handler or the handler was
			 * registered with SA_RESTART */
			if (!(ka->sa.sa_flags & SA_RESTART)) {
				regs->r10 = -EINTR;
				break;
			}
		/* fallthrough */
		case -ERESTARTNOINTR:
			/* ERESTARTNOINTR means that the syscall should
			 * be called again after the signal handler returns. */
			RESTART_CRIS_SYS(regs);
		}
	}

	/* Set up the stack frame */
	if (ka->sa.sa_flags & SA_SIGINFO)
		ret = setup_rt_frame(sig, ka, info, oldset, regs);
	else
		ret = setup_frame(sig, ka, oldset, regs);

	if (ret == 0) {
		spin_lock_irq(&current->sighand->siglock);
		sigorsets(&current->blocked, &current->blocked,
			&ka->sa.sa_mask);
		if (!(ka->sa.sa_flags & SA_NODEFER))
			sigaddset(&current->blocked, sig);
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}
	return ret;
}