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 2004 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 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4 1.8 */ 32 33 /* 34 * This module establishes a unique connection on 35 * a STREAMS-based pipe. 36 */ 37 #include <sys/types.h> 38 #include <sys/sysmacros.h> 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/errno.h> 42 #include <sys/signal.h> 43 #include <sys/user.h> 44 #include <sys/fstyp.h> 45 #include <sys/stropts.h> 46 #include <sys/stream.h> 47 #include <sys/strsubr.h> 48 #include <sys/vnode.h> 49 #include <sys/file.h> 50 #include <sys/fs/fifonode.h> 51 #include <sys/debug.h> 52 #include <sys/ddi.h> 53 54 /* 55 * This is the loadable module wrapper. 56 */ 57 #include <sys/conf.h> 58 #include <sys/modctl.h> 59 60 extern struct streamtab conninfo; 61 62 static struct fmodsw fsw = { 63 "connld", 64 &conninfo, 65 D_NEW | D_MP 66 }; 67 68 /* 69 * Module linkage information for the kernel. 70 */ 71 72 static struct modlstrmod modlstrmod = { 73 &mod_strmodops, "Streams-based pipes", &fsw 74 }; 75 76 static struct modlinkage modlinkage = { 77 MODREV_1, (void *)&modlstrmod, NULL 78 }; 79 80 int 81 _init() 82 { 83 return (mod_install(&modlinkage)); 84 } 85 86 int 87 _fini() 88 { 89 return (mod_remove(&modlinkage)); 90 } 91 92 int 93 _info(struct modinfo *modinfop) 94 { 95 return (mod_info(&modlinkage, modinfop)); 96 } 97 98 /* 99 * Define local and external routines. 100 */ 101 int connopen(queue_t *, dev_t *, int, int, cred_t *); 102 int connclose(queue_t *, int, cred_t *); 103 int connput(queue_t *, mblk_t *); 104 105 /* 106 * Define STREAMS header information. 107 */ 108 static struct module_info conn_info = { 109 1003, 110 "connld", 111 0, 112 INFPSZ, 113 STRHIGH, 114 STRLOW 115 }; 116 static struct qinit connrinit = { 117 connput, 118 NULL, 119 connopen, 120 connclose, 121 NULL, 122 &conn_info, 123 NULL 124 }; 125 static struct qinit connwinit = { 126 connput, 127 NULL, 128 NULL, 129 NULL, 130 NULL, 131 &conn_info, 132 NULL 133 }; 134 struct streamtab conninfo = { 135 &connrinit, 136 &connwinit 137 }; 138 139 /* 140 * For each invocation of connopen(), create a new pipe. One end of the pipe 141 * is sent to the process on the other end of this STREAM. The vnode for 142 * the other end is returned to the open() system call as the vnode for 143 * the opened object. 144 * 145 * On the first invocation of connopen(), a flag is set and the routine 146 * returns 0, since the first open corresponds to the pushing of the module. 147 */ 148 /*ARGSUSED*/ 149 int 150 connopen(queue_t *rqp, dev_t *devp, int flag, int sflag, cred_t *crp) 151 { 152 int error = 0; 153 vnode_t *streamvp; 154 fifonode_t *streamfnp; 155 156 if ((streamvp = strq2vp(rqp)) == NULL) { 157 return (EINVAL); 158 } 159 160 /* 161 * CONNLD is only allowed to be pushed onto a "pipe" that has both 162 * of its ends open. 163 */ 164 if (streamvp->v_type != VFIFO) { 165 error = EINVAL; 166 goto out; 167 } 168 169 streamfnp = VTOF(streamvp); 170 171 if (!(streamfnp->fn_flag & ISPIPE) || 172 streamfnp->fn_dest->fn_open == 0) { 173 error = EPIPE; 174 goto out; 175 } 176 177 /* 178 * If this is the first time CONNLD was opened while on this stream, 179 * it is being pushed. Therefore, set a flag and return 0. 180 */ 181 if (rqp->q_ptr == 0) { 182 if (streamfnp->fn_flag & FIFOCONNLD) { 183 error = ENXIO; 184 goto out; 185 } 186 rqp->q_ptr = (caddr_t)1; 187 streamfnp->fn_flag |= FIFOCONNLD; 188 qprocson(rqp); 189 } 190 out: 191 VN_RELE(streamvp); 192 return (error); 193 } 194 195 /*ARGSUSED*/ 196 int 197 connclose(queue_t *q, int cflag, cred_t *crp) 198 { 199 vnode_t *streamvp; 200 fifonode_t *streamfnp; 201 202 qprocsoff(q); 203 streamvp = strq2vp(q); 204 205 ASSERT(streamvp != NULL); 206 ASSERT(streamvp->v_type == VFIFO); 207 208 streamfnp = VTOF(streamvp); 209 streamfnp->fn_flag &= ~FIFOCONNLD; 210 VN_RELE(streamvp); 211 return (0); 212 } 213 214 /* 215 * Use same put procedure for write and read queues. 216 */ 217 int 218 connput(queue_t *q, mblk_t *bp) 219 { 220 putnext(q, bp); 221 return (0); 222 } 223