nint_next.c

操作系统SunOS 4.1.3版本的源码

#ifndef	lint
#ifdef sccs
static	char sccsid[] = "@(#)nint_next.c 1.1 92/07/30 Copyr 1985 Sun Micro";
#endif
#endif

/*
 * Copyright (c) 1985 by Sun Microsystems, Inc.
 */

/*
 * Nint_next.c - Implement the nint_next_callout private interface.
 */

#include <sunwindow/ntfy.h>
#include <sunwindow/ndet.h>
#include <sunwindow/nint.h>

pkg_private Notify_func
nint_next_callout(nclient, type)
	Notify_client nclient;
	NTFY_TYPE type;
{
	NTFY_CONDITION *stack_cond;
	Notify_func func;

	NTFY_BEGIN_CRITICAL;
	/* Do error checking */
	if (nint_stack_next < 1) {
		ntfy_set_errno(NOTIFY_INVAL);
		goto Error;
	}
	/* Get top stack condition */
	stack_cond = &nint_stack[nint_stack_next-1];
	/* Do further error and consistency checking */
	if (stack_cond->func_count == 1 ||
	    stack_cond->func_next > stack_cond->func_count ||
	    stack_cond->func_next+1 > NTFY_FUNCS_MAX ||
	    stack_cond->type != type ||
	    stack_cond->data.an_u_int != (u_int) nclient) {
		ntfy_set_errno(NOTIFY_INVAL);
		goto Error;
	}
	/* Get next function */
	func = stack_cond->callout.functions[stack_cond->func_next];
	/* Increment function index */
	stack_cond->func_next++;
	NTFY_END_CRITICAL;
	return(func);
Error:
	NTFY_END_CRITICAL;
	return(NOTIFY_FUNC_NULL);
}