pr_door.c

Sun Solaris 10 中的 DTrace 组件的源代码。请参看: http://www.sun.com/software/solaris/observability.jsp

/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only.
 * See the file usr/src/LICENSING.NOTICE in this distribution or
 * http://www.opensolaris.org/license/ for details.
 */

#pragma ident	"@(#)pr_door.c	1.2	00/03/05 SMI"

#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <door.h>
#include "libproc.h"

/*
 * door() system calls -- executed by subject process
 */

int
pr_door_info(struct ps_prochandle *Pr, int did, door_info_t *di)
{
	extern int _door_info(int, door_info_t *);	/* header file? */
	sysret_t rval;			/* return value from _door_info() */
	argdes_t argd[6];		/* arg descriptors for _door_info() */
	argdes_t *adp = &argd[0];	/* first argument */
	int error;

	if (Pr == NULL)		/* no subject process */
		return (_door_info(did, di));

	adp->arg_value = did;
	adp->arg_object = NULL;
	adp->arg_type = AT_BYVAL;
	adp->arg_inout = AI_INPUT;
	adp->arg_size = 0;
	adp++;			/* move to door_info_t argument */

	adp->arg_value = 0;
	adp->arg_object = di;
	adp->arg_type = AT_BYREF;
	adp->arg_inout = AI_OUTPUT;
	adp->arg_size = sizeof (door_info_t);
	adp++;			/* move to unused argument */

	adp->arg_value = 0;
	adp->arg_object = NULL;
	adp->arg_type = AT_BYVAL;
	adp->arg_inout = AI_INPUT;
	adp->arg_size = 0;
	adp++;			/* move to unused argument */

	adp->arg_value = 0;
	adp->arg_object = NULL;
	adp->arg_type = AT_BYVAL;
	adp->arg_inout = AI_INPUT;
	adp->arg_size = 0;
	adp++;			/* move to unused argument */

	adp->arg_value = 0;
	adp->arg_object = NULL;
	adp->arg_type = AT_BYVAL;
	adp->arg_inout = AI_INPUT;
	adp->arg_size = 0;
	adp++;			/* move to subcode argument */

	adp->arg_value = DOOR_INFO;
	adp->arg_object = NULL;
	adp->arg_type = AT_BYVAL;
	adp->arg_inout = AI_INPUT;
	adp->arg_size = 0;

	error = Psyscall(Pr, &rval, SYS_door, 6, &argd[0]);

	if (error) {
		errno = (error < 0)? ENOSYS : error;
		return (-1);
	}
	return (0);
}