/*************************************************************************                          Printk Driver                                ***************************************************************************									** Author:	David Grothe <dave@gcom.com>				**									** Copyright (C) 1997  David Grothe, Gcom, Inc <dave@gcom.com>		**									** This driver, /dev/printk, allows user level programs to write to	** the kernel's log.  When a user program writes to /dev/printk it	** turns into a kernel printk() call.  The purpose of this driver is	** to allow user level test programs of STREAMS to get their messages	** in sequence with the debug messages originating from the kernel.	**									*************************************************************************//* * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. *  * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Library General Public License for more details. *  * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Cambridge, * MA 02139, USA. *  */#ident "@(#) LiS printk.c 2.3 3/19/01 22:03:39 "#include <sys/stream.h>#include <sys/osif.h>static struct module_info printk_minfo ={  0,				/* id */  "printk",			/* name */  0,				/* min packet size accepted */  0,				/* max packet size accepted */  0,				/* high water mark */  0				/* low water mark */};static int   printk_open  (queue_t *, dev_t*, int, int, cred_t *);static int   printk_close (queue_t *, int, cred_t *);static int   printk_wput (queue_t *, mblk_t *);/* qinit structures (rd and wr side)  */static struct qinit printk_rinit ={  NULL,				/* put */         NULL,				/* service  */    printk_open,			/* open */        printk_close,			/* close */       NULL,				/* admin */       &printk_minfo,		/* info */        NULL				/* stat */      };static struct qinit printk_winit ={  printk_wput, 	                /* put */         NULL, 			/* service  */    NULL, 			/* open */        NULL, 			/* close */       NULL, 			/* admin */       &printk_minfo, 		/* info */        NULL				/* stat */      };/* streamtab for the printk driver. */struct streamtab printk_info ={  &printk_rinit,		/* read queue */  &printk_winit,		/* write queue */  NULL,				/* mux read queue  */  NULL				/* mux write queue */};/* * Open routine grants all opens */static intprintk_open (queue_t *q, dev_t *devp, int flag, int sflag, cred_t *credp){    (void) q ;					/* compiler happiness */    (void) devp ;				/* compiler happiness */    (void) flag ;				/* compiler happiness */    (void) sflag ;				/* compiler happiness */    (void) credp ;				/* compiler happiness */    return(0) ;					/* success */} /* printk_open */static intprintk_close (queue_t *q, int dummy, cred_t *credp){    (void) q ;					/* compiler happiness */    (void) dummy ;    (void) credp ;    return(0) ;}static int printk_wput (queue_t *q, mblk_t *msg){    mblk_t	*mp ;    char	*p ;    char	 c ;    (void) q;				/* compiler happiness */    if (msg->b_datap->db_type != M_DATA)    {	freemsg(msg) ;	return(0) ;    }    for (mp = msg; mp != NULL; mp = mp->b_cont)    {	if (mp->b_rptr >= mp->b_wptr) continue ;	p = mp->b_wptr - 1 ;			/* to last chr of msg */	c = *p ;				/* fetch last chr */	*p = 0 ;				/* last chr to NUL */	printk("%s%c", mp->b_rptr, c) ;		/* write msg */    }    freemsg(msg) ;				/* done with msg */    return(0) ;} /* printk_wput  */