1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
23*0Sstevel@tonic-gate /* All Rights Reserved */
24*0Sstevel@tonic-gate
25*0Sstevel@tonic-gate
26*0Sstevel@tonic-gate #ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.6 */
27*0Sstevel@tonic-gate /* LINTLIBRARY */
28*0Sstevel@tonic-gate
29*0Sstevel@tonic-gate
30*0Sstevel@tonic-gate #include <errno.h>
31*0Sstevel@tonic-gate #include <fcntl.h>
32*0Sstevel@tonic-gate #include <string.h>
33*0Sstevel@tonic-gate #include <stropts.h>
34*0Sstevel@tonic-gate
35*0Sstevel@tonic-gate #include "lp.h"
36*0Sstevel@tonic-gate #include "msgs.h"
37*0Sstevel@tonic-gate
38*0Sstevel@tonic-gate extern int Lp_prio_msg;
39*0Sstevel@tonic-gate
40*0Sstevel@tonic-gate /*
41*0Sstevel@tonic-gate ** Function: int mread( MESG *, char *, int)
42*0Sstevel@tonic-gate ** Args: message descriptor
43*0Sstevel@tonic-gate ** message buffer (var)
44*0Sstevel@tonic-gate ** buffer size
45*0Sstevel@tonic-gate ** Return: The size of the message in message buffer.
46*0Sstevel@tonic-gate ** or -1 on error. Possible errnos are:
47*0Sstevel@tonic-gate ** EINVAL Bad value for md or msgbuf.
48*0Sstevel@tonic-gate ** E2BIG Not enough space for message.
49*0Sstevel@tonic-gate ** EPIPE Far end dropped the connection.
50*0Sstevel@tonic-gate ** ENOMSG No valid message available on fifo.
51*0Sstevel@tonic-gate **
52*0Sstevel@tonic-gate ** mread examines message descriptor and either calls read3_2
53*0Sstevel@tonic-gate ** to read 3.2 HPI messages or getmsg(2) to read 4.0 HPI messages.
54*0Sstevel@tonic-gate ** If a message is read, it is returned in message buffer.
55*0Sstevel@tonic-gate */
56*0Sstevel@tonic-gate
57*0Sstevel@tonic-gate #if defined(__STDC__)
mread(MESG * md,char * msgbuf,int size)58*0Sstevel@tonic-gate int mread ( MESG * md, char * msgbuf, int size )
59*0Sstevel@tonic-gate #else
60*0Sstevel@tonic-gate int mread ( md, msgbuf, size )
61*0Sstevel@tonic-gate MESG *md;
62*0Sstevel@tonic-gate char *msgbuf;
63*0Sstevel@tonic-gate int size;
64*0Sstevel@tonic-gate #endif
65*0Sstevel@tonic-gate {
66*0Sstevel@tonic-gate int flag = 0;
67*0Sstevel@tonic-gate char buff [MSGMAX];
68*0Sstevel@tonic-gate struct strbuf dat;
69*0Sstevel@tonic-gate struct strbuf ctl;
70*0Sstevel@tonic-gate
71*0Sstevel@tonic-gate if (md == NULL || msgbuf == NULL)
72*0Sstevel@tonic-gate {
73*0Sstevel@tonic-gate errno = EINVAL;
74*0Sstevel@tonic-gate return(-1);
75*0Sstevel@tonic-gate }
76*0Sstevel@tonic-gate
77*0Sstevel@tonic-gate switch(md->type)
78*0Sstevel@tonic-gate {
79*0Sstevel@tonic-gate case MD_CHILD:
80*0Sstevel@tonic-gate case MD_STREAM:
81*0Sstevel@tonic-gate case MD_BOUND:
82*0Sstevel@tonic-gate if (size <= 0)
83*0Sstevel@tonic-gate {
84*0Sstevel@tonic-gate errno = E2BIG;
85*0Sstevel@tonic-gate return(-1);
86*0Sstevel@tonic-gate }
87*0Sstevel@tonic-gate dat.buf = msgbuf;
88*0Sstevel@tonic-gate dat.maxlen = size;
89*0Sstevel@tonic-gate dat.len = 0;
90*0Sstevel@tonic-gate ctl.buf = buff;
91*0Sstevel@tonic-gate ctl.maxlen = sizeof (buff);
92*0Sstevel@tonic-gate ctl.len = 0;
93*0Sstevel@tonic-gate flag = Lp_prio_msg;
94*0Sstevel@tonic-gate Lp_prio_msg = 0; /* clean this up so there are no surprises */
95*0Sstevel@tonic-gate
96*0Sstevel@tonic-gate if (Getmsg(md, &ctl, &dat, &flag) < 0)
97*0Sstevel@tonic-gate {
98*0Sstevel@tonic-gate if (errno == EBADF)
99*0Sstevel@tonic-gate errno = EPIPE;
100*0Sstevel@tonic-gate return(-1);
101*0Sstevel@tonic-gate }
102*0Sstevel@tonic-gate
103*0Sstevel@tonic-gate if (dat.len == 0)
104*0Sstevel@tonic-gate {
105*0Sstevel@tonic-gate (void) Close(md->readfd);
106*0Sstevel@tonic-gate return(0);
107*0Sstevel@tonic-gate }
108*0Sstevel@tonic-gate break;
109*0Sstevel@tonic-gate
110*0Sstevel@tonic-gate case MD_USR_FIFO:
111*0Sstevel@tonic-gate case MD_SYS_FIFO:
112*0Sstevel@tonic-gate if (size < CONTROL_LEN)
113*0Sstevel@tonic-gate {
114*0Sstevel@tonic-gate errno = E2BIG;
115*0Sstevel@tonic-gate return(-1);
116*0Sstevel@tonic-gate }
117*0Sstevel@tonic-gate
118*0Sstevel@tonic-gate if (read3_2(md, msgbuf, size) < 0)
119*0Sstevel@tonic-gate return(-1);
120*0Sstevel@tonic-gate break;
121*0Sstevel@tonic-gate }
122*0Sstevel@tonic-gate
123*0Sstevel@tonic-gate return((int)msize(msgbuf));
124*0Sstevel@tonic-gate }
125