nint_remove.c

来自「操作系统SunOS 4.1.3版本的源码」· C语言 代码 · 共 79 行

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

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

/*
 * Nint_remove.c - Implement the nint_remove_func private interface.
 */

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

pkg_private Notify_error	
nint_remove_func(nclient, func, type, data, use_data)
	Notify_client nclient;
	Notify_func func;
	NTFY_TYPE type;
	caddr_t data;
	int use_data;
{
	NTFY_CLIENT *client;
	register NTFY_CONDITION *cond;
	register int i, j;
	
	NTFY_BEGIN_CRITICAL;
	/* Find client */
	if ((client = ntfy_find_nclient(ndet_clients, nclient,
	    &ndet_client_latest)) == NTFY_CLIENT_NULL) {
		ntfy_set_errno(NOTIFY_UNKNOWN_CLIENT);
		goto Error;
	}
	/* Find condition using data */
	if ((cond = ntfy_find_condition(client->conditions, type,
	    &(client->condition_latest), data, use_data)) ==
	    NTFY_CONDITION_NULL) {
		ntfy_set_errno(NOTIFY_NO_CONDITION);
		goto Error;
	}
	/* If going to remove last function then error */
	if (cond->func_count == 1) {
		ntfy_set_errno(NOTIFY_FUNC_LIMIT);
		goto Error;
	}
	for (i = 0; i < cond->func_count; ++i) {
		/* Find matching function */
		if (cond->callout.functions[i] == func) {
			/* Slide remaining functions over removed one */
			for (j = i; j < cond->func_count; j++) {
				cond->callout.functions[j] =
				    cond->callout.functions[j+1];
			}
			/* Let's be tidy */
			cond->callout.functions[--cond->func_count] =
			    NOTIFY_FUNC_NULL;
			/* Exit external loop */
			break;
		}
	}
	/* Remove function list if no more interpositions */
	if (cond->func_count == 1) {
		Notify_func func_save = *(cond->callout.functions);
		
		ntfy_free_functions(cond->callout.functions);
		cond->callout.function = func_save;
	}
	NTFY_END_CRITICAL;
	return(NOTIFY_OK);
Error:
	NTFY_END_CRITICAL;
	return(notify_errno);
}