1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1997 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 31 32 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.2 */ 33 34 #include <unistd.h> 35 #include <signal.h> 36 #include <stropts.h> 37 #include <errno.h> 38 #include "lp.h" 39 #include "msgs.h" 40 41 extern int errno; 42 43 /* 44 * Putmsg() function 45 * Return 0: success, 46 * non-zero: return code of the failed putmsg() system call. 47 * plus errno for caller to check. 48 * NOTE: cannot do TRACE* calls if errno is expected to be returned! 49 * TRACE* uses fprintf and destroys the content of errno. 50 * Save errno before the TRACE* calls. 51 */ 52 53 int 54 Putmsg (MESG *mdp, strbuf_t *ctlp, strbuf_t *datap, int flags) 55 { 56 int i; 57 int rtncode; 58 int count; 59 struct pollfd fds; 60 61 fds.fd = mdp->writefd; 62 fds.events = POLLOUT; 63 fds.revents = 0; 64 65 (void) poll(&fds, 1, 1000); 66 if (fds.revents & (POLLHUP | POLLERR | POLLNVAL)) { 67 errno = EBADF; 68 return (-1); 69 } 70 71 if (!(fds.revents & POLLOUT)) { 72 errno = EAGAIN; 73 return (-1); 74 } 75 76 rtncode = putmsg (mdp->writefd, ctlp, datap, flags); 77 return (rtncode); 78 } 79 80 int 81 Getmsg (MESG *mdp, strbuf_t *ctlp, strbuf_t *datap, int *flagsp) 82 { 83 int rtncode; 84 85 rtncode = getmsg (mdp->readfd, ctlp, datap, flagsp); 86 return (rtncode); 87 } 88 89 char AuthCode[HEAD_AUTHCODE_LEN]; 90 static void (*callers_sigpipe_trap)() = SIG_DFL; 91 92 93 /* 94 ** Function: static int read3_2( MESG *, char *, int) 95 ** Args: message descriptor 96 ** message buffer (var) 97 ** buffer size 98 ** Return: 0 for sucess, -1 for failure 99 ** 100 ** This performs a 3.2 HPI style read_fifo on the pipe referanced 101 ** in the message descriptor. If a message is found, it is returned 102 ** in message buffer. 103 */ 104 int read3_2 ( MESG * md, char *msgbuf, int size ) 105 { 106 short type; 107 108 if (md->type == MD_USR_FIFO) 109 (void) Close (Open(md->file, O_RDONLY, 0)); 110 111 do 112 { 113 switch (read_fifo(md->readfd, msgbuf, size)) 114 { 115 case -1: 116 return (-1); 117 118 case 0: 119 /* 120 ** The fifo was empty and we have O_NDELAY set, 121 ** or the Spooler closed our FIFO. 122 ** We don't set O_NDELAY in the user process, 123 ** so that should never happen. But be warned 124 ** that we can't tell the difference in some versions 125 ** of the UNIX op. sys.!! 126 ** 127 */ 128 errno = EPIPE; 129 return (-1); 130 } 131 132 if ((type = stoh(msgbuf + HEAD_TYPE)) < 0 || LAST_MESSAGE < type) 133 { 134 errno = ENOMSG; 135 return (-1); 136 } 137 } 138 while (type == I_QUEUE_CHK); 139 140 (void)memcpy (AuthCode, msgbuf + HEAD_AUTHCODE, HEAD_AUTHCODE_LEN); 141 142 /* 143 ** Get the size from the 3.2 HPI message 144 ** minus the size of the control data 145 ** Copy the actual message 146 ** Reset the message size. 147 */ 148 size = stoh(msgbuf + HEAD_SIZE) - EXCESS_3_2_LEN; 149 memmove(msgbuf, msgbuf + HEAD_SIZE, size); 150 (void) htos(msgbuf + MESG_SIZE, size); 151 return(0); 152 } 153 154 int write3_2 ( MESG * md, char * msgbuf, int size ) 155 { 156 char tmpbuf [MSGMAX + EXCESS_3_2_LEN]; 157 int rval; 158 159 160 (void) memmove(tmpbuf + HEAD_SIZE, msgbuf, size); 161 (void) htos(tmpbuf + HEAD_SIZE, size + EXCESS_3_2_LEN); 162 (void) memcpy (tmpbuf + HEAD_AUTHCODE, AuthCode, HEAD_AUTHCODE_LEN); 163 164 callers_sigpipe_trap = signal(SIGPIPE, SIG_IGN); 165 166 rval = write_fifo(md->writefd, tmpbuf, size + EXCESS_3_2_LEN); 167 168 (void) signal(SIGPIPE, callers_sigpipe_trap); 169 170 171 return (rval); 172 } 173