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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
#ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.6 */
/* LINTLIBRARY */
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stropts.h>
#include "lp.h"
#include "msgs.h"
extern int Lp_prio_msg;
/*
** Function: int mread( MESG *, char *, int)
** Args: message descriptor
** message buffer (var)
** buffer size
** Return: The size of the message in message buffer.
** or -1 on error. Possible errnos are:
** EINVAL Bad value for md or msgbuf.
** E2BIG Not enough space for message.
** EPIPE Far end dropped the connection.
** ENOMSG No valid message available on fifo.
**
** mread examines message descriptor and either calls read3_2
** to read 3.2 HPI messages or getmsg(2) to read 4.0 HPI messages.
** If a message is read, it is returned in message buffer.
*/
#if defined(__STDC__)
int mread ( MESG * md, char * msgbuf, int size )
#else
int mread ( md, msgbuf, size )
MESG *md;
char *msgbuf;
int size;
#endif
{
int flag = 0;
char buff [MSGMAX];
struct strbuf dat;
struct strbuf ctl;
if (md == NULL || msgbuf == NULL)
{
errno = EINVAL;
return(-1);
}
switch(md->type)
{
case MD_CHILD:
case MD_STREAM:
case MD_BOUND:
if (size <= 0)
{
errno = E2BIG;
return(-1);
}
dat.buf = msgbuf;
dat.maxlen = size;
dat.len = 0;
ctl.buf = buff;
ctl.maxlen = sizeof (buff);
ctl.len = 0;
flag = Lp_prio_msg;
Lp_prio_msg = 0; /* clean this up so there are no surprises */
if (Getmsg(md, &ctl, &dat, &flag) < 0)
{
if (errno == EBADF)
errno = EPIPE;
return(-1);
}
if (dat.len == 0)
{
(void) Close(md->readfd);
return(0);
}
break;
case MD_USR_FIFO:
case MD_SYS_FIFO:
if (size < CONTROL_LEN)
{
errno = E2BIG;
return(-1);
}
if (read3_2(md, msgbuf, size) < 0)
return(-1);
break;
}
return((int)msize(msgbuf));
}
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